Replace dart_core.js with actual compiled SDK

test/codegen/expect/dart/convert.js

-var convert;
-(function(exports) {
-  'use strict';
-  let ASCII = new AsciiCodec();
-  let _ASCII_MASK = 127;
-  let _allowInvalid = Symbol('_allowInvalid');
-  let Codec$ = dart.generic(function(S, T) {
-    class Codec extends core.Object {
-      Codec() {
-      }
-      encode(input) {
-        return this.encoder.convert(input);
-      }
-      decode(encoded) {
-        return this.decoder.convert(encoded);
-      }
-      fuse(other) {
-        return new _FusedCodec(this, other);
-      }
-      get inverted() {
-        return new _InvertedCodec(this);
-      }
-    }
-    return Codec;
-  });
-  let Codec = Codec$(dart.dynamic, dart.dynamic);
-  class Encoding extends Codec$(core.String, core.List$(core.int)) {
-    Encoding() {
-      super.Codec();
-    }
-    decodeStream(byteStream) {
-      return dart.as(byteStream.transform(dart.as(this.decoder, async.StreamTransformer$(core.List$(core.int), dynamic))).fold(new core.StringBuffer(), (buffer, string) => dart.dinvoke(buffer, 'write', string), buffer).then((buffer) => dart.dinvoke(buffer, 'toString')), async.Future$(core.String));
-    }
-    static getByName(name) {
-      if (name === null)
-        return null;
-      name = name.toLowerCase();
-      return _nameToEncoding.get(name);
-    }
-  }
-  dart.defineLazyProperties(Encoding, {
-    get _nameToEncoding() {
-      return dart.map({"iso_8859-1:1987": LATIN1, "iso-ir-100": LATIN1, "iso_8859-1": LATIN1, "iso-8859-1": LATIN1, latin1: LATIN1, l1: LATIN1, ibm819: LATIN1, cp819: LATIN1, csisolatin1: LATIN1, "iso-ir-6": ASCII, "ansi_x3.4-1968": ASCII, "ansi_x3.4-1986": ASCII, "iso_646.irv:1991": ASCII, "iso646-us": ASCII, "us-ascii": ASCII, us: ASCII, ibm367: ASCII, cp367: ASCII, csascii: ASCII, ascii: ASCII, csutf8: UTF8, "utf-8": UTF8});
-    },
-    set _nameToEncoding(_) {}
-  });
-  class AsciiCodec extends Encoding {
-    AsciiCodec(opt$) {
-      let allowInvalid = opt$.allowInvalid === void 0 ? false : opt$.allowInvalid;
-      this[_allowInvalid] = allowInvalid;
-      super.Encoding();
-    }
-    get name() {
-      return "us-ascii";
-    }
-    decode(bytes, opt$) {
-      let allowInvalid = opt$.allowInvalid === void 0 ? null : opt$.allowInvalid;
-      if (allowInvalid === null)
-        allowInvalid = this[_allowInvalid];
-      if (allowInvalid) {
-        return new AsciiDecoder({allowInvalid: true}).convert(bytes);
-      } else {
-        return new AsciiDecoder({allowInvalid: false}).convert(bytes);
-      }
-    }
-    get encoder() {
-      return new AsciiEncoder();
-    }
-    get decoder() {
-      return this[_allowInvalid] ? new AsciiDecoder({allowInvalid: true}) : new AsciiDecoder({allowInvalid: false});
-    }
-  }
-  let _subsetMask = Symbol('_subsetMask');
-  let Converter$ = dart.generic(function(S, T) {
-    class Converter extends core.Object {
-      Converter() {
-      }
-      fuse(other) {
-        return new _FusedConverter(this, other);
-      }
-      startChunkedConversion(sink) {
-        throw new core.UnsupportedError(`This converter does not support chunked conversions: ${this}`);
-      }
-      bind(source) {
-        return new async.Stream.eventTransformed(source, ((sink) => new _ConverterStreamEventSink(this, sink)).bind(this));
-      }
-    }
-    return Converter;
-  });
-  let Converter = Converter$(dart.dynamic, dart.dynamic);
-  class _UnicodeSubsetEncoder extends Converter$(core.String, core.List$(core.int)) {
-    _UnicodeSubsetEncoder($_subsetMask) {
-      this[_subsetMask] = $_subsetMask;
-      super.Converter();
-    }
-    convert(string, start, end) {
-      if (start === void 0)
-        start = 0;
-      if (end === void 0)
-        end = null;
-      let stringLength = string.length;
-      core.RangeError.checkValidRange(start, end, stringLength);
-      if (end === null)
-        end = stringLength;
-      let length = dart.notNull(end) - dart.notNull(start);
-      let result = new typed_data.Uint8List(length);
-      for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
-        let codeUnit = string.codeUnitAt(dart.notNull(start) + dart.notNull(i));
-        if ((dart.notNull(codeUnit) & ~dart.notNull(this[_subsetMask])) !== 0) {
-          throw new core.ArgumentError("String contains invalid characters.");
-        }
-        result.set(i, codeUnit);
-      }
-      return dart.as(result, core.List$(core.int));
-    }
-    startChunkedConversion(sink) {
-      if (!dart.is(sink, ByteConversionSink)) {
-        sink = new ByteConversionSink.from(sink);
-      }
-      return new _UnicodeSubsetEncoderSink(this[_subsetMask], dart.as(sink, ByteConversionSink));
-    }
-    bind(stream) {
-      return dart.as(super.bind(stream), async.Stream$(core.List$(core.int)));
-    }
-  }
-  class AsciiEncoder extends _UnicodeSubsetEncoder {
-    AsciiEncoder() {
-      super._UnicodeSubsetEncoder(_ASCII_MASK);
-    }
-  }
-  let _sink = Symbol('_sink');
-  class StringConversionSinkMixin extends core.Object {
-    add(str) {
-      return this.addSlice(str, 0, str.length, false);
-    }
-    asUtf8Sink(allowMalformed) {
-      return new _Utf8ConversionSink(this, allowMalformed);
-    }
-    asStringSink() {
-      return new _StringConversionSinkAsStringSinkAdapter(this);
-    }
-  }
-  class StringConversionSinkBase extends StringConversionSinkMixin {
-  }
-  class _UnicodeSubsetEncoderSink extends StringConversionSinkBase {
-    _UnicodeSubsetEncoderSink($_subsetMask, $_sink) {
-      this[_subsetMask] = $_subsetMask;
-      this[_sink] = $_sink;
-      super.StringConversionSinkBase();
-    }
-    close() {
-      this[_sink].close();
-    }
-    addSlice(source, start, end, isLast) {
-      core.RangeError.checkValidRange(start, end, source.length);
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let codeUnit = source.codeUnitAt(i);
-        if ((dart.notNull(codeUnit) & ~dart.notNull(this[_subsetMask])) !== 0) {
-          throw new core.ArgumentError(`Source contains invalid character with code point: ${codeUnit}.`);
-        }
-      }
-      this[_sink].add(source.codeUnits.sublist(start, end));
-      if (isLast) {
-        this.close();
-      }
-    }
-  }
-  let _convertInvalid = Symbol('_convertInvalid');
-  class _UnicodeSubsetDecoder extends Converter$(core.List$(core.int), core.String) {
-    _UnicodeSubsetDecoder($_allowInvalid, $_subsetMask) {
-      this[_allowInvalid] = $_allowInvalid;
-      this[_subsetMask] = $_subsetMask;
-      super.Converter();
-    }
-    convert(bytes, start, end) {
-      if (start === void 0)
-        start = 0;
-      if (end === void 0)
-        end = null;
-      let byteCount = bytes.length;
-      core.RangeError.checkValidRange(start, end, byteCount);
-      if (end === null)
-        end = byteCount;
-      let length = dart.notNull(end) - dart.notNull(start);
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let byte = bytes.get(i);
-        if ((dart.notNull(byte) & ~dart.notNull(this[_subsetMask])) !== 0) {
-          if (!dart.notNull(this[_allowInvalid])) {
-            throw new core.FormatException(`Invalid value in input: ${byte}`);
-          }
-          return this[_convertInvalid](bytes, start, end);
-        }
-      }
-      return new core.String.fromCharCodes(bytes, start, end);
-    }
-    [_convertInvalid](bytes, start, end) {
-      let buffer = new core.StringBuffer();
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let value = bytes.get(i);
-        if ((dart.notNull(value) & ~dart.notNull(this[_subsetMask])) !== 0)
-          value = 65533;
-        buffer.writeCharCode(value);
-      }
-      return buffer.toString();
-    }
-    bind(stream) {
-      return dart.as(super.bind(stream), async.Stream$(core.String));
-    }
-  }
-  class AsciiDecoder extends _UnicodeSubsetDecoder {
-    AsciiDecoder(opt$) {
-      let allowInvalid = opt$.allowInvalid === void 0 ? false : opt$.allowInvalid;
-      super._UnicodeSubsetDecoder(allowInvalid, _ASCII_MASK);
-    }
-    startChunkedConversion(sink) {
-      let stringSink = null;
-      if (dart.is(sink, StringConversionSink)) {
-        stringSink = sink;
-      } else {
-        stringSink = new StringConversionSink.from(sink);
-      }
-      if (this[_allowInvalid]) {
-        return new _ErrorHandlingAsciiDecoderSink(stringSink.asUtf8Sink(false));
-      } else {
-        return new _SimpleAsciiDecoderSink(stringSink);
-      }
-    }
-  }
-  let _utf8Sink = Symbol('_utf8Sink');
-  let ChunkedConversionSink$ = dart.generic(function(T) {
-    class ChunkedConversionSink extends core.Object {
-      ChunkedConversionSink() {
-      }
-      ChunkedConversionSink$withCallback(callback) {
-        return new _SimpleCallbackSink(callback);
-      }
-    }
-    dart.defineNamedConstructor(ChunkedConversionSink, 'withCallback');
-    return ChunkedConversionSink;
-  });
-  let ChunkedConversionSink = ChunkedConversionSink$(dart.dynamic);
-  class ByteConversionSink extends ChunkedConversionSink$(core.List$(core.int)) {
-    ByteConversionSink() {
-      super.ChunkedConversionSink();
-    }
-    ByteConversionSink$withCallback(callback) {
-      return new _ByteCallbackSink(callback);
-    }
-    ByteConversionSink$from(sink) {
-      return new _ByteAdapterSink(sink);
-    }
-  }
-  dart.defineNamedConstructor(ByteConversionSink, 'withCallback');
-  dart.defineNamedConstructor(ByteConversionSink, 'from');
-  class ByteConversionSinkBase extends ByteConversionSink {
-    addSlice(chunk, start, end, isLast) {
-      this.add(chunk.sublist(start, end));
-      if (isLast)
-        this.close();
-    }
-  }
-  class _ErrorHandlingAsciiDecoderSink extends ByteConversionSinkBase {
-    _ErrorHandlingAsciiDecoderSink($_utf8Sink) {
-      this[_utf8Sink] = $_utf8Sink;
-      super.ByteConversionSinkBase();
-    }
-    close() {
-      this[_utf8Sink].close();
-    }
-    add(source) {
-      this.addSlice(source, 0, source.length, false);
-    }
-    addSlice(source, start, end, isLast) {
-      core.RangeError.checkValidRange(start, end, source.length);
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        if ((dart.notNull(source.get(i)) & ~dart.notNull(_ASCII_MASK)) !== 0) {
-          if (dart.notNull(i) > dart.notNull(start))
-            this[_utf8Sink].addSlice(source, start, i, false);
-          this[_utf8Sink].add(/* Unimplemented const */new List.from([239, 191, 189]));
-          start = dart.notNull(i) + 1;
-        }
-      }
-      if (dart.notNull(start) < dart.notNull(end)) {
-        this[_utf8Sink].addSlice(source, start, end, isLast);
-      } else if (isLast) {
-        this.close();
-      }
-    }
-  }
-  class _SimpleAsciiDecoderSink extends ByteConversionSinkBase {
-    _SimpleAsciiDecoderSink($_sink) {
-      this[_sink] = $_sink;
-      super.ByteConversionSinkBase();
-    }
-    close() {
-      this[_sink].close();
-    }
-    add(source) {
-      for (let i = 0; dart.notNull(i) < dart.notNull(source.length); i = dart.notNull(i) + 1) {
-        if ((dart.notNull(source.get(i)) & ~dart.notNull(_ASCII_MASK)) !== 0) {
-          throw new core.FormatException("Source contains non-ASCII bytes.");
-        }
-      }
-      this[_sink].add(new core.String.fromCharCodes(source));
-    }
-    addSlice(source, start, end, isLast) {
-      let length = source.length;
-      core.RangeError.checkValidRange(start, end, length);
-      if (dart.notNull(start) < dart.notNull(end)) {
-        if (start !== 0 || end !== length) {
-          source = source.sublist(start, end);
-        }
-        this.add(source);
-      }
-      if (isLast)
-        this.close();
-    }
-  }
-  class _ByteAdapterSink extends ByteConversionSinkBase {
-    _ByteAdapterSink($_sink) {
-      this[_sink] = $_sink;
-      super.ByteConversionSinkBase();
-    }
-    add(chunk) {
-      return this[_sink].add(chunk);
-    }
-    close() {
-      return this[_sink].close();
-    }
-  }
-  let _buffer = Symbol('_buffer');
-  let _callback = Symbol('_callback');
-  let _bufferIndex = Symbol('_bufferIndex');
-  let _roundToPowerOf2 = Symbol('_roundToPowerOf2');
-  class _ByteCallbackSink extends ByteConversionSinkBase {
-    _ByteCallbackSink(callback) {
-      this[_buffer] = new typed_data.Uint8List(_ByteCallbackSink._INITIAL_BUFFER_SIZE);
-      this[_callback] = callback;
-      this[_bufferIndex] = 0;
-      super.ByteConversionSinkBase();
-    }
-    add(chunk) {
-      let freeCount = dart.notNull(this[_buffer].length) - dart.notNull(this[_bufferIndex]);
-      if (dart.notNull(chunk.length) > dart.notNull(freeCount)) {
-        let oldLength = this[_buffer].length;
-        let newLength = dart.notNull(_roundToPowerOf2(dart.notNull(chunk.length) + dart.notNull(oldLength))) * 2;
-        let grown = new typed_data.Uint8List(newLength);
-        grown.setRange(0, this[_buffer].length, this[_buffer]);
-        this[_buffer] = grown;
-      }
-      this[_buffer].setRange(this[_bufferIndex], dart.notNull(this[_bufferIndex]) + dart.notNull(chunk.length), chunk);
-      this[_bufferIndex] = chunk.length;
-    }
-    static [_roundToPowerOf2](v) {
-      dart.assert(dart.notNull(v) > 0);
-      v = dart.notNull(v) - 1;
-      v = dart.notNull(v) >> 1;
-      v = dart.notNull(v) >> 2;
-      v = dart.notNull(v) >> 4;
-      v = dart.notNull(v) >> 8;
-      v = dart.notNull(v) >> 16;
-      v = dart.notNull(v) + 1;
-      return v;
-    }
-    close() {
-      this[_callback](this[_buffer].sublist(0, this[_bufferIndex]));
-    }
-  }
-  _ByteCallbackSink._INITIAL_BUFFER_SIZE = 1024;
-  let _accumulated = Symbol('_accumulated');
-  let _SimpleCallbackSink$ = dart.generic(function(T) {
-    class _SimpleCallbackSink extends ChunkedConversionSink$(T) {
-      _SimpleCallbackSink($_callback) {
-        this[_accumulated] = new List.from([]);
-        this[_callback] = $_callback;
-        super.ChunkedConversionSink();
-      }
-      add(chunk) {
-        this[_accumulated].add(chunk);
-      }
-      close() {
-        this[_callback](this[_accumulated]);
-      }
-    }
-    return _SimpleCallbackSink;
-  });
-  let _SimpleCallbackSink = _SimpleCallbackSink$(dart.dynamic);
-  let _EventSinkAdapter$ = dart.generic(function(T) {
-    class _EventSinkAdapter extends core.Object {
-      _EventSinkAdapter($_sink) {
-        this[_sink] = $_sink;
-      }
-      add(data) {
-        return this[_sink].add(data);
-      }
-      close() {
-        return this[_sink].close();
-      }
-    }
-    return _EventSinkAdapter;
-  });
-  let _EventSinkAdapter = _EventSinkAdapter$(dart.dynamic);
-  let _eventSink = Symbol('_eventSink');
-  let _chunkedSink = Symbol('_chunkedSink');
-  let _ConverterStreamEventSink$ = dart.generic(function(S, T) {
-    class _ConverterStreamEventSink extends core.Object {
-      _ConverterStreamEventSink(converter, sink) {
-        this[_eventSink] = sink;
-        this[_chunkedSink] = converter.startChunkedConversion(sink);
-      }
-      add(o) {
-        return this[_chunkedSink].add(o);
-      }
-      addError(error, stackTrace) {
-        if (stackTrace === void 0)
-          stackTrace = null;
-        this[_eventSink].addError(error, stackTrace);
-      }
-      close() {
-        return this[_chunkedSink].close();
-      }
-    }
-    return _ConverterStreamEventSink;
-  });
-  let _ConverterStreamEventSink = _ConverterStreamEventSink$(dart.dynamic, dart.dynamic);
-  let _first = Symbol('_first');
-  let _second = Symbol('_second');
-  let _FusedCodec$ = dart.generic(function(S, M, T) {
-    class _FusedCodec extends Codec$(S, T) {
-      get encoder() {
-        return dart.as(this[_first].encoder.fuse(this[_second].encoder), Converter$(S, T));
-      }
-      get decoder() {
-        return dart.as(this[_second].decoder.fuse(this[_first].decoder), Converter$(T, S));
-      }
-      _FusedCodec($_first, $_second) {
-        this[_first] = $_first;
-        this[_second] = $_second;
-        super.Codec();
-      }
-    }
-    return _FusedCodec;
-  });
-  let _FusedCodec = _FusedCodec$(dart.dynamic, dart.dynamic, dart.dynamic);
-  let _codec = Symbol('_codec');
-  let _InvertedCodec$ = dart.generic(function(T, S) {
-    class _InvertedCodec extends Codec$(T, S) {
-      _InvertedCodec(codec) {
-        this[_codec] = codec;
-        super.Codec();
-      }
-      get encoder() {
-        return this[_codec].decoder;
-      }
-      get decoder() {
-        return this[_codec].encoder;
-      }
-      get inverted() {
-        return this[_codec];
-      }
-    }
-    return _InvertedCodec;
-  });
-  let _InvertedCodec = _InvertedCodec$(dart.dynamic, dart.dynamic);
-  let _FusedConverter$ = dart.generic(function(S, M, T) {
-    class _FusedConverter extends Converter$(S, T) {
-      _FusedConverter($_first, $_second) {
-        this[_first] = $_first;
-        this[_second] = $_second;
-        super.Converter();
-      }
-      convert(input) {
-        return dart.as(this[_second].convert(this[_first].convert(input)), T);
-      }
-      startChunkedConversion(sink) {
-        return this[_first].startChunkedConversion(this[_second].startChunkedConversion(sink));
-      }
-    }
-    return _FusedConverter;
-  });
-  let _FusedConverter = _FusedConverter$(dart.dynamic, dart.dynamic, dart.dynamic);
-  let HTML_ESCAPE = new HtmlEscape();
-  let _name = Symbol('_name');
-  class HtmlEscapeMode extends core.Object {
-    HtmlEscapeMode$_($_name, escapeLtGt, escapeQuot, escapeApos, escapeSlash) {
-      this[_name] = $_name;
-      this.escapeLtGt = escapeLtGt;
-      this.escapeQuot = escapeQuot;
-      this.escapeApos = escapeApos;
-      this.escapeSlash = escapeSlash;
-    }
-    toString() {
-      return this[_name];
-    }
-  }
-  dart.defineNamedConstructor(HtmlEscapeMode, '_');
-  HtmlEscapeMode.UNKNOWN = new HtmlEscapeMode._('unknown', true, true, true, true);
-  HtmlEscapeMode.ATTRIBUTE = new HtmlEscapeMode._('attribute', false, true, false, false);
-  HtmlEscapeMode.ELEMENT = new HtmlEscapeMode._('element', true, false, false, true);
-  let _convert = Symbol('_convert');
-  class HtmlEscape extends Converter$(core.String, core.String) {
-    HtmlEscape(mode) {
-      if (mode === void 0)
-        mode = HtmlEscapeMode.UNKNOWN;
-      this.mode = mode;
-      super.Converter();
-    }
-    convert(text) {
-      let val = this[_convert](text, 0, text.length);
-      return val === null ? text : val;
-    }
-    [_convert](text, start, end) {
-      let result = null;
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let ch = text.get(i);
-        let replace = null;
-        switch (ch) {
-          case '&':
-            replace = '&amp;';
-            break;
-          case ' ':
-            replace = '&nbsp;';
-            break;
-          case '"':
-            if (this.mode.escapeQuot)
-              replace = '&quot;';
-            break;
-          case "'":
-            if (this.mode.escapeApos)
-              replace = '&#x27;';
-            break;
-          case '<':
-            if (this.mode.escapeLtGt)
-              replace = '&lt;';
-            break;
-          case '>':
-            if (this.mode.escapeLtGt)
-              replace = '&gt;';
-            break;
-          case '/':
-            if (this.mode.escapeSlash)
-              replace = '&#x2F;';
-            break;
-        }
-        if (replace !== null) {
-          if (result === null)
-            result = new core.StringBuffer(text.substring(start, i));
-          result.write(replace);
-        } else if (result !== null) {
-          result.write(ch);
-        }
-      }
-      return result !== null ? result.toString() : null;
-    }
-    startChunkedConversion(sink) {
-      if (!dart.is(sink, StringConversionSink)) {
-        sink = new StringConversionSink.from(sink);
-      }
-      return new _HtmlEscapeSink(this, dart.as(sink, StringConversionSink));
-    }
-  }
-  let _escape = Symbol('_escape');
-  class _HtmlEscapeSink extends StringConversionSinkBase {
-    _HtmlEscapeSink($_escape, $_sink) {
-      this[_escape] = $_escape;
-      this[_sink] = $_sink;
-      super.StringConversionSinkBase();
-    }
-    addSlice(chunk, start, end, isLast) {
-      let val = this[_escape]._convert(chunk, start, end);
-      if (val === null) {
-        this[_sink].addSlice(chunk, start, end, isLast);
-      } else {
-        this[_sink].add(val);
-        if (isLast)
-          this[_sink].close();
-      }
-    }
-    close() {
-      return this[_sink].close();
-    }
-  }
-  class JsonUnsupportedObjectError extends core.Error {
-    JsonUnsupportedObjectError(unsupportedObject, opt$) {
-      let cause = opt$.cause === void 0 ? null : opt$.cause;
-      this.unsupportedObject = unsupportedObject;
-      this.cause = cause;
-      super.Error();
-    }
-    toString() {
-      if (this.cause !== null) {
-        return "Converting object to an encodable object failed.";
-      } else {
-        return "Converting object did not return an encodable object.";
-      }
-    }
-  }
-  class JsonCyclicError extends JsonUnsupportedObjectError {
-    JsonCyclicError(object) {
-      super.JsonUnsupportedObjectError(object);
-    }
-    toString() {
-      return "Cyclic error in JSON stringify";
-    }
-  }
-  let JSON = new JsonCodec();
-  let _reviver = Symbol('_reviver');
-  let _toEncodable = Symbol('_toEncodable');
-  class JsonCodec extends Codec$(core.Object, core.String) {
-    JsonCodec(opt$) {
-      let reviver = opt$.reviver === void 0 ? null : opt$.reviver;
-      let toEncodable = opt$.toEncodable === void 0 ? null : opt$.toEncodable;
-      this[_reviver] = reviver;
-      this[_toEncodable] = toEncodable;
-      super.Codec();
-    }
-    JsonCodec$withReviver(reviver) {
-      this.JsonCodec({reviver: reviver});
-    }
-    decode(source, opt$) {
-      let reviver = opt$.reviver === void 0 ? null : opt$.reviver;
-      if (reviver === null)
-        reviver = this[_reviver];
-      if (reviver === null)
-        return this.decoder.convert(source);
-      return new JsonDecoder(reviver).convert(source);
-    }
-    encode(value, opt$) {
-      let toEncodable = opt$.toEncodable === void 0 ? null : opt$.toEncodable;
-      if (toEncodable === null)
-        toEncodable = this[_toEncodable];
-      if (toEncodable === null)
-        return this.encoder.convert(value);
-      return new JsonEncoder(dart.closureWrap(toEncodable, "(Object) → Object")).convert(value);
-    }
-    get encoder() {
-      if (this[_toEncodable] === null)
-        return new JsonEncoder();
-      return new JsonEncoder(dart.closureWrap(this[_toEncodable], "(Object) → Object"));
-    }
-    get decoder() {
-      if (this[_reviver] === null)
-        return new JsonDecoder();
-      return new JsonDecoder(this[_reviver]);
-    }
-  }
-  dart.defineNamedConstructor(JsonCodec, 'withReviver');
-  class JsonEncoder extends Converter$(core.Object, core.String) {
-    JsonEncoder(toEncodable) {
-      if (toEncodable === void 0)
-        toEncodable = null;
-      this.indent = null;
-      this[_toEncodable] = toEncodable;
-      super.Converter();
-    }
-    JsonEncoder$withIndent(indent, toEncodable) {
-      if (toEncodable === void 0)
-        toEncodable = null;
-      this.indent = indent;
-      this[_toEncodable] = toEncodable;
-      super.Converter();
-    }
-    convert(object) {
-      return _JsonStringStringifier.stringify(object, dart.as(this[_toEncodable], dart.throw_("Unimplemented type (dynamic) → dynamic")), this.indent);
-    }
-    startChunkedConversion(sink) {
-      if (!dart.is(sink, StringConversionSink)) {
-        sink = new StringConversionSink.from(sink);
-      } else if (dart.is(sink, _Utf8EncoderSink)) {
-        return new _JsonUtf8EncoderSink(sink[_sink], this[_toEncodable], JsonUtf8Encoder._utf8Encode(this.indent), JsonUtf8Encoder.DEFAULT_BUFFER_SIZE);
-      }
-      return new _JsonEncoderSink(dart.as(sink, StringConversionSink), this[_toEncodable], this.indent);
-    }
-    bind(stream) {
-      return dart.as(super.bind(stream), async.Stream$(core.String));
-    }
-    fuse(other) {
-      if (dart.is(other, Utf8Encoder)) {
-        return new JsonUtf8Encoder(this.indent, dart.as(this[_toEncodable], dart.throw_("Unimplemented type (Object) → dynamic")));
-      }
-      return super.fuse(other);
-    }
-  }
-  dart.defineNamedConstructor(JsonEncoder, 'withIndent');
-  let _indent = Symbol('_indent');
-  let _bufferSize = Symbol('_bufferSize');
-  let _utf8Encode = Symbol('_utf8Encode');
-  class JsonUtf8Encoder extends Converter$(core.Object, core.List$(core.int)) {
-    JsonUtf8Encoder(indent, toEncodable, bufferSize) {
-      if (indent === void 0)
-        indent = null;
-      if (toEncodable === void 0)
-        toEncodable = null;
-      if (bufferSize === void 0)
-        bufferSize = JsonUtf8Encoder.DEFAULT_BUFFER_SIZE;
-      this[_indent] = _utf8Encode(indent);
-      this[_toEncodable] = toEncodable;
-      this[_bufferSize] = bufferSize;
-      super.Converter();
-    }
-    static [_utf8Encode](string) {
-      if (string === null)
-        return null;
-      if (string.isEmpty)
-        return new typed_data.Uint8List(0);
-      checkAscii: {
-        for (let i = 0; dart.notNull(i) < dart.notNull(string.length); i = dart.notNull(i) + 1) {
-          if (dart.notNull(string.codeUnitAt(i)) >= 128)
-            break checkAscii;
-        }
-        return string.codeUnits;
-      }
-      return UTF8.encode(string);
-    }
-    convert(object) {
-      let bytes = dart.as(new List.from([]), core.List$(core.List$(core.int)));
-      // Function addChunk: (Uint8List, int, int) → void
-      function addChunk(chunk, start, end) {
-        if (dart.notNull(start) > 0 || dart.notNull(end) < dart.notNull(chunk.length)) {
-          let length = dart.notNull(end) - dart.notNull(start);
-          chunk = new typed_data.Uint8List.view(chunk.buffer, dart.notNull(chunk.offsetInBytes) + dart.notNull(start), length);
-        }
-        bytes.add(chunk);
-      }
-      _JsonUtf8Stringifier.stringify(object, this[_indent], dart.as(this[_toEncodable], dart.throw_("Unimplemented type (Object) → dynamic")), this[_bufferSize], addChunk);
-      if (bytes.length === 1)
-        return bytes.get(0);
-      let length = 0;
-      for (let i = 0; dart.notNull(i) < dart.notNull(bytes.length); i = dart.notNull(i) + 1) {
-        length = bytes.get(i).length;
-      }
-      let result = new typed_data.Uint8List(length);
-      for (let i = 0, offset = 0; dart.notNull(i) < dart.notNull(bytes.length); i = dart.notNull(i) + 1) {
-        let byteList = bytes.get(i);
-        let end = dart.notNull(offset) + dart.notNull(byteList.length);
-        result.setRange(offset, end, byteList);
-        offset = end;
-      }
-      return result;
-    }
-    startChunkedConversion(sink) {
-      let byteSink = null;
-      if (dart.is(sink, ByteConversionSink)) {
-        byteSink = sink;
-      } else {
-        byteSink = new ByteConversionSink.from(sink);
-      }
-      return new _JsonUtf8EncoderSink(byteSink, this[_toEncodable], this[_indent], this[_bufferSize]);
-    }
-    bind(stream) {
-      return dart.as(super.bind(stream), async.Stream$(core.List$(core.int)));
-    }
-    fuse(other) {
-      return super.fuse(other);
-    }
-  }
-  JsonUtf8Encoder.DEFAULT_BUFFER_SIZE = 256;
-  let _isDone = Symbol('_isDone');
-  class _JsonEncoderSink extends ChunkedConversionSink$(core.Object) {
-    _JsonEncoderSink($_sink, $_toEncodable, $_indent) {
-      this[_sink] = $_sink;
-      this[_toEncodable] = $_toEncodable;
-      this[_indent] = $_indent;
-      this[_isDone] = false;
-      super.ChunkedConversionSink();
-    }
-    add(o) {
-      if (this[_isDone]) {
-        throw new core.StateError("Only one call to add allowed");
-      }
-      this[_isDone] = true;
-      let stringSink = this[_sink].asStringSink();
-      _JsonStringStringifier.printOn(o, stringSink, dart.as(this[_toEncodable], dart.throw_("Unimplemented type (dynamic) → dynamic")), this[_indent]);
-      stringSink.close();
-    }
-    close() {}
-  }
-  let _addChunk = Symbol('_addChunk');
-  class _JsonUtf8EncoderSink extends ChunkedConversionSink$(core.Object) {
-    _JsonUtf8EncoderSink($_sink, $_toEncodable, $_indent, $_bufferSize) {
-      this[_sink] = $_sink;
-      this[_toEncodable] = $_toEncodable;
-      this[_indent] = $_indent;
-      this[_bufferSize] = $_bufferSize;
-      this[_isDone] = false;
-      super.ChunkedConversionSink();
-    }
-    [_addChunk](chunk, start, end) {
-      this[_sink].addSlice(chunk, start, end, false);
-    }
-    add(object) {
-      if (this[_isDone]) {
-        throw new core.StateError("Only one call to add allowed");
-      }
-      this[_isDone] = true;
-      _JsonUtf8Stringifier.stringify(object, this[_indent], dart.as(this[_toEncodable], dart.throw_("Unimplemented type (Object) → dynamic")), this[_bufferSize], this[_addChunk]);
-      this[_sink].close();
-    }
-    close() {
-      if (!dart.notNull(this[_isDone])) {
-        this[_isDone] = true;
-        this[_sink].close();
-      }
-    }
-  }
-  class JsonDecoder extends Converter$(core.String, core.Object) {
-    JsonDecoder(reviver) {
-      if (reviver === void 0)
-        reviver = null;
-      this[_reviver] = reviver;
-      super.Converter();
-    }
-    convert(input) {
-      return _parseJson(input, this[_reviver]);
-    }
-    startChunkedConversion(sink) {
-      return new _JsonDecoderSink(this[_reviver], sink);
-    }
-    bind(stream) {
-      return dart.as(super.bind(stream), async.Stream$(core.Object));
-    }
-  }
-  // Function _parseJson: (String, (dynamic, dynamic) → dynamic) → dynamic
-  function _parseJson(source, reviver) {
-    if (!(typeof source == string))
-      throw new core.ArgumentError(source);
-    let parsed = null;
-    try {
-      parsed = JSON.parse(source);
-    } catch (e) {
-      throw new core.FormatException(String(e));
-    }
-
-    if (reviver === null) {
-      return _convertJsonToDartLazy(parsed);
-    } else {
-      return _convertJsonToDart(parsed, reviver);
-    }
-  }
-  // Function _defaultToEncodable: (dynamic) → Object
-  function _defaultToEncodable(object) {
-    return dart.dinvoke(object, 'toJson');
-  }
-  let _seen = Symbol('_seen');
-  let _checkCycle = Symbol('_checkCycle');
-  let _removeSeen = Symbol('_removeSeen');
-  class _JsonStringifier extends core.Object {
-    _JsonStringifier(_toEncodable) {
-      this[_seen] = new core.List();
-      this[_toEncodable] = dart.as(_toEncodable !== null ? _toEncodable : _defaultToEncodable, core.Function);
-    }
-    static hexDigit(x) {
-      return dart.notNull(x) < 10 ? 48 + dart.notNull(x) : 87 + dart.notNull(x);
-    }
-    writeStringContent(s) {
-      let offset = 0;
-      let length = s.length;
-      for (let i = 0; dart.notNull(i) < dart.notNull(length); i = dart.notNull(i) + 1) {
-        let charCode = s.codeUnitAt(i);
-        if (dart.notNull(charCode) > dart.notNull(_JsonStringifier.BACKSLASH))
-          continue;
-        if (dart.notNull(charCode) < 32) {
-          if (dart.notNull(i) > dart.notNull(offset))
-            this.writeStringSlice(s, offset, i);
-          offset = dart.notNull(i) + 1;
-          this.writeCharCode(_JsonStringifier.BACKSLASH);
-          switch (charCode) {
-            case _JsonStringifier.BACKSPACE:
-              this.writeCharCode(_JsonStringifier.CHAR_b);
-              break;
-            case _JsonStringifier.TAB:
-              this.writeCharCode(_JsonStringifier.CHAR_t);
-              break;
-            case _JsonStringifier.NEWLINE:
-              this.writeCharCode(_JsonStringifier.CHAR_n);
-              break;
-            case _JsonStringifier.FORM_FEED:
-              this.writeCharCode(_JsonStringifier.CHAR_f);
-              break;
-            case _JsonStringifier.CARRIAGE_RETURN:
-              this.writeCharCode(_JsonStringifier.CHAR_r);
-              break;
-            default:
-              this.writeCharCode(_JsonStringifier.CHAR_u);
-              this.writeCharCode(_JsonStringifier.CHAR_0);
-              this.writeCharCode(_JsonStringifier.CHAR_0);
-              this.writeCharCode(hexDigit(dart.notNull(charCode) >> 4 & 15));
-              this.writeCharCode(hexDigit(dart.notNull(charCode) & 15));
-              break;
-          }
-        } else if (charCode === _JsonStringifier.QUOTE || charCode === _JsonStringifier.BACKSLASH) {
-          if (dart.notNull(i) > dart.notNull(offset))
-            this.writeStringSlice(s, offset, i);
-          offset = dart.notNull(i) + 1;
-          this.writeCharCode(_JsonStringifier.BACKSLASH);
-          this.writeCharCode(charCode);
-        }
-      }
-      if (offset === 0) {
-        this.writeString(s);
-      } else if (dart.notNull(offset) < dart.notNull(length)) {
-        this.writeStringSlice(s, offset, length);
-      }
-    }
-    [_checkCycle](object) {
-      for (let i = 0; dart.notNull(i) < dart.notNull(this[_seen].length); i = dart.notNull(i) + 1) {
-        if (core.identical(object, this[_seen].get(i))) {
-          throw new JsonCyclicError(object);
-        }
-      }
-      this[_seen].add(object);
-    }
-    [_removeSeen](object) {
-      dart.assert(!dart.notNull(this[_seen].isEmpty));
-      dart.assert(core.identical(this[_seen].last, object));
-      this[_seen].removeLast();
-    }
-    writeObject(object) {
-      if (this.writeJsonValue(object))
-        return;
-      this[_checkCycle](object);
-      try {
-        let customJson = dart.dinvokef(this[_toEncodable], object);
-        if (!dart.notNull(this.writeJsonValue(customJson))) {
-          throw new JsonUnsupportedObjectError(object);
-        }
-        this[_removeSeen](object);
-      } catch (e) {
-        throw new JsonUnsupportedObjectError(object, {cause: e});
-      }
-
-    }
-    writeJsonValue(object) {
-      if (dart.is(object, core.num)) {
-        if (dart.dunary('!', dart.dload(object, 'isFinite')))
-          return false;
-        this.writeNumber(dart.as(object, core.num));
-        return true;
-      } else if (core.identical(object, true)) {
-        this.writeString('true');
-        return true;
-      } else if (core.identical(object, false)) {
-        this.writeString('false');
-        return true;
-      } else if (object === null) {
-        this.writeString('null');
-        return true;
-      } else if (typeof object == string) {
-        this.writeString('"');
-        this.writeStringContent(dart.as(object, core.String));
-        this.writeString('"');
-        return true;
-      } else if (dart.is(object, core.List)) {
-        this[_checkCycle](object);
-        this.writeList(dart.as(object, core.List));
-        this[_removeSeen](object);
-        return true;
-      } else if (dart.is(object, core.Map)) {
-        this[_checkCycle](object);
-        this.writeMap(dart.as(object, core.Map$(core.String, core.Object)));
-        this[_removeSeen](object);
-        return true;
-      } else {
-        return false;
-      }
-    }
-    writeList(list) {
-      this.writeString('[');
-      if (dart.notNull(list.length) > 0) {
-        this.writeObject(list.get(0));
-        for (let i = 1; dart.notNull(i) < dart.notNull(list.length); i = dart.notNull(i) + 1) {
-          this.writeString(',');
-          this.writeObject(list.get(i));
-        }
-      }
-      this.writeString(']');
-    }
-    writeMap(map) {
-      this.writeString('{');
-      let separator = '"';
-      map.forEach(dart.closureWrap(((key, value) => {
-        this.writeString(separator);
-        separator = ',"';
-        this.writeStringContent(key);
-        this.writeString('":');
-        this.writeObject(value);
-      }).bind(this), "(String, Object) → void"));
-      this.writeString('}');
-    }
-  }
-  _JsonStringifier.BACKSPACE = 8;
-  _JsonStringifier.TAB = 9;
-  _JsonStringifier.NEWLINE = 10;
-  _JsonStringifier.CARRIAGE_RETURN = 13;
-  _JsonStringifier.FORM_FEED = 12;
-  _JsonStringifier.QUOTE = 34;
-  _JsonStringifier.CHAR_0 = 48;
-  _JsonStringifier.BACKSLASH = 92;
-  _JsonStringifier.CHAR_b = 98;
-  _JsonStringifier.CHAR_f = 102;
-  _JsonStringifier.CHAR_n = 110;
-  _JsonStringifier.CHAR_r = 114;
-  _JsonStringifier.CHAR_t = 116;
-  _JsonStringifier.CHAR_u = 117;
-  let _indentLevel = Symbol('_indentLevel');
-  class _JsonPrettyPrintMixin extends core.Object {
-    _JsonPrettyPrintMixin() {
-      this[_indentLevel] = 0;
-    }
-    writeList(list) {
-      if (list.isEmpty) {
-        this.writeString('[]');
-      } else {
-        this.writeString('[\n');
-        this[_indentLevel] = dart.notNull(this[_indentLevel]) + 1;
-        this.writeIndentation(this[_indentLevel]);
-        this.writeObject(list.get(0));
-        for (let i = 1; dart.notNull(i) < dart.notNull(list.length); i = dart.notNull(i) + 1) {
-          this.writeString(',\n');
-          this.writeIndentation(this[_indentLevel]);
-          this.writeObject(list.get(i));
-        }
-        this.writeString('\n');
-        this[_indentLevel] = dart.notNull(this[_indentLevel]) - 1;
-        this.writeIndentation(this[_indentLevel]);
-        this.writeString(']');
-      }
-    }
-    writeMap(map) {
-      if (map.isEmpty) {
-        this.writeString('{}');
-      } else {
-        this.writeString('{\n');
-        this[_indentLevel] = dart.notNull(this[_indentLevel]) + 1;
-        let first = true;
-        map.forEach(((key, value) => {
-          if (!dart.notNull(first)) {
-            this.writeString(",\n");
-          }
-          this.writeIndentation(this[_indentLevel]);
-          this.writeString('"');
-          this.writeStringContent(key);
-          this.writeString('": ');
-          this.writeObject(value);
-          first = false;
-        }).bind(this));
-        this.writeString('\n');
-        this[_indentLevel] = dart.notNull(this[_indentLevel]) - 1;
-        this.writeIndentation(this[_indentLevel]);
-        this.writeString('}');
-      }
-    }
-  }
-  class _JsonStringStringifier extends _JsonStringifier {
-    _JsonStringStringifier($_sink, _toEncodable) {
-      this[_sink] = $_sink;
-      super._JsonStringifier(dart.as(_toEncodable, dart.throw_("Unimplemented type (Object) → Object")));
-    }
-    static stringify(object, toEncodable, indent) {
-      let output = new core.StringBuffer();
-      printOn(object, output, toEncodable, indent);
-      return output.toString();
-    }
-    static printOn(object, output, toEncodable, indent) {
-      let stringifier = null;
-      if (indent === null) {
-        stringifier = new _JsonStringStringifier(output, toEncodable);
-      } else {
-        stringifier = new _JsonStringStringifierPretty(output, toEncodable, indent);
-      }
-      dart.dinvoke(stringifier, 'writeObject', object);
-    }
-    writeNumber(number) {
-      this[_sink].write(number.toString());
-    }
-    writeString(string) {
-      this[_sink].write(string);
-    }
-    writeStringSlice(string, start, end) {
-      this[_sink].write(string.substring(start, end));
-    }
-    writeCharCode(charCode) {
-      this[_sink].writeCharCode(charCode);
-    }
-  }
-  class _JsonStringStringifierPretty extends dart.mixin(_JsonStringStringifier, _JsonPrettyPrintMixin) {
-    _JsonStringStringifierPretty(sink, toEncodable, $_indent) {
-      this[_indent] = $_indent;
-      super._JsonStringStringifier(sink, toEncodable);
-    }
-    writeIndentation(count) {
-      for (let i = 0; dart.notNull(i) < dart.notNull(count); i = dart.notNull(i) + 1)
-        this.writeString(this[_indent]);
-    }
-  }
-  class _JsonUtf8Stringifier extends _JsonStringifier {
-    _JsonUtf8Stringifier(toEncodable, bufferSize, addChunk) {
-      this.addChunk = addChunk;
-      this.bufferSize = bufferSize;
-      this.buffer = new typed_data.Uint8List(bufferSize);
-      this.index = 0;
-      super._JsonStringifier(dart.as(toEncodable, dart.throw_("Unimplemented type (Object) → Object")));
-    }
-    static stringify(object, indent, toEncodableFunction, bufferSize, addChunk) {
-      let stringifier = null;
-      if (indent !== null) {
-        stringifier = new _JsonUtf8StringifierPretty(toEncodableFunction, indent, bufferSize, addChunk);
-      } else {
-        stringifier = new _JsonUtf8Stringifier(toEncodableFunction, bufferSize, addChunk);
-      }
-      stringifier.writeObject(object);
-      stringifier.flush();
-    }
-    flush() {
-      if (dart.notNull(this.index) > 0) {
-        dart.dinvokef(this.addChunk, this.buffer, 0, this.index);
-      }
-      this.buffer = null;
-      this.index = 0;
-    }
-    writeNumber(number) {
-      this.writeAsciiString(number.toString());
-    }
-    writeAsciiString(string) {
-      for (let i = 0; dart.notNull(i) < dart.notNull(string.length); i = dart.notNull(i) + 1) {
-        let char = string.codeUnitAt(i);
-        dart.assert(dart.notNull(char) <= 127);
-        this.writeByte(char);
-      }
-    }
-    writeString(string) {
-      this.writeStringSlice(string, 0, string.length);
-    }
-    writeStringSlice(string, start, end) {
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let char = string.codeUnitAt(i);
-        if (dart.notNull(char) <= 127) {
-          this.writeByte(char);
-        } else {
-          if ((dart.notNull(char) & 64512) === 55296 && dart.notNull(i) + 1 < dart.notNull(end)) {
-            let nextChar = string.codeUnitAt(dart.notNull(i) + 1);
-            if ((dart.notNull(nextChar) & 64512) === 56320) {
-              char = 65536 + ((dart.notNull(char) & 1023) << 10) + (dart.notNull(nextChar) & 1023);
-              this.writeFourByteCharCode(char);
-              i = dart.notNull(i) + 1;
-              continue;
-            }
-          }
-          this.writeMultiByteCharCode(char);
-        }
-      }
-    }
-    writeCharCode(charCode) {
-      if (dart.notNull(charCode) <= 127) {
-        this.writeByte(charCode);
-        return;
-      }
-      this.writeMultiByteCharCode(charCode);
-    }
-    writeMultiByteCharCode(charCode) {
-      if (dart.notNull(charCode) <= 2047) {
-        this.writeByte(192 | dart.notNull(charCode) >> 6);
-        this.writeByte(128 | dart.notNull(charCode) & 63);
-        return;
-      }
-      if (dart.notNull(charCode) <= 65535) {
-        this.writeByte(224 | dart.notNull(charCode) >> 12);
-        this.writeByte(128 | dart.notNull(charCode) >> 6 & 63);
-        this.writeByte(128 | dart.notNull(charCode) & 63);
-        return;
-      }
-      this.writeFourByteCharCode(charCode);
-    }
-    writeFourByteCharCode(charCode) {
-      dart.assert(dart.notNull(charCode) <= 1114111);
-      this.writeByte(240 | dart.notNull(charCode) >> 18);
-      this.writeByte(128 | dart.notNull(charCode) >> 12 & 63);
-      this.writeByte(128 | dart.notNull(charCode) >> 6 & 63);
-      this.writeByte(128 | dart.notNull(charCode) & 63);
-    }
-    writeByte(byte) {
-      dart.assert(dart.notNull(byte) <= 255);
-      if (this.index === this.buffer.length) {
-        dart.dinvokef(this.addChunk, this.buffer, 0, this.index);
-        this.buffer = new typed_data.Uint8List(this.bufferSize);
-        this.index = 0;
-      }
-      this.buffer.set((($tmp) => this.index = dart.notNull($tmp) + 1, $tmp).bind(this)(this.index), byte);
-    }
-  }
-  class _JsonUtf8StringifierPretty extends dart.mixin(_JsonUtf8Stringifier, _JsonPrettyPrintMixin) {
-    _JsonUtf8StringifierPretty(toEncodableFunction, indent, bufferSize, addChunk) {
-      this.indent = indent;
-      super._JsonUtf8Stringifier(toEncodableFunction, dart.as(bufferSize, core.int), dart.as(addChunk, core.Function));
-    }
-    writeIndentation(count) {
-      let indent = this.indent;
-      let indentLength = indent.length;
-      if (indentLength === 1) {
-        let char = indent.get(0);
-        while (dart.notNull(count) > 0) {
-          this.writeByte(char);
-          count = 1;
-        }
-        return;
-      }
-      while (dart.notNull(count) > 0) {
-        count = dart.notNull(count) - 1;
-        let end = dart.notNull(this.index) + dart.notNull(indentLength);
-        if (dart.notNull(end) <= dart.notNull(this.buffer.length)) {
-          this.buffer.setRange(this.index, end, indent);
-          this.index = end;
-        } else {
-          for (let i = 0; dart.notNull(i) < dart.notNull(indentLength); i = dart.notNull(i) + 1) {
-            this.writeByte(indent.get(i));
-          }
-        }
-      }
-    }
-  }
-  let LATIN1 = new Latin1Codec();
-  let _LATIN1_MASK = 255;
-  class Latin1Codec extends Encoding {
-    Latin1Codec(opt$) {
-      let allowInvalid = opt$.allowInvalid === void 0 ? false : opt$.allowInvalid;
-      this[_allowInvalid] = allowInvalid;
-      super.Encoding();
-    }
-    get name() {
-      return "iso-8859-1";
-    }
-    decode(bytes, opt$) {
-      let allowInvalid = opt$.allowInvalid === void 0 ? null : opt$.allowInvalid;
-      if (allowInvalid === null)
-        allowInvalid = this[_allowInvalid];
-      if (allowInvalid) {
-        return new Latin1Decoder({allowInvalid: true}).convert(bytes);
-      } else {
-        return new Latin1Decoder({allowInvalid: false}).convert(bytes);
-      }
-    }
-    get encoder() {
-      return new Latin1Encoder();
-    }
-    get decoder() {
-      return this[_allowInvalid] ? new Latin1Decoder({allowInvalid: true}) : new Latin1Decoder({allowInvalid: false});
-    }
-  }
-  class Latin1Encoder extends _UnicodeSubsetEncoder {
-    Latin1Encoder() {
-      super._UnicodeSubsetEncoder(_LATIN1_MASK);
-    }
-  }
-  class Latin1Decoder extends _UnicodeSubsetDecoder {
-    Latin1Decoder(opt$) {
-      let allowInvalid = opt$.allowInvalid === void 0 ? false : opt$.allowInvalid;
-      super._UnicodeSubsetDecoder(allowInvalid, _LATIN1_MASK);
-    }
-    startChunkedConversion(sink) {
-      let stringSink = null;
-      if (dart.is(sink, StringConversionSink)) {
-        stringSink = sink;
-      } else {
-        stringSink = new StringConversionSink.from(sink);
-      }
-      if (!dart.notNull(this[_allowInvalid]))
-        return new _Latin1DecoderSink(stringSink);
-      return new _Latin1AllowInvalidDecoderSink(stringSink);
-    }
-  }
-  let _addSliceToSink = Symbol('_addSliceToSink');
-  class _Latin1DecoderSink extends ByteConversionSinkBase {
-    _Latin1DecoderSink($_sink) {
-      this[_sink] = $_sink;
-      super.ByteConversionSinkBase();
-    }
-    close() {
-      this[_sink].close();
-    }
-    add(source) {
-      this.addSlice(source, 0, source.length, false);
-    }
-    [_addSliceToSink](source, start, end, isLast) {
-      this[_sink].add(new core.String.fromCharCodes(source, start, end));
-      if (isLast)
-        this.close();
-    }
-    addSlice(source, start, end, isLast) {
-      core.RangeError.checkValidRange(start, end, source.length);
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let char = source.get(i);
-        if (dart.notNull(char) > dart.notNull(_LATIN1_MASK) || dart.notNull(char) < 0) {
-          throw new core.FormatException("Source contains non-Latin-1 characters.");
-        }
-      }
-      if (dart.notNull(start) < dart.notNull(end)) {
-        this[_addSliceToSink](source, start, end, isLast);
-      }
-      if (isLast) {
-        this.close();
-      }
-    }
-  }
-  class _Latin1AllowInvalidDecoderSink extends _Latin1DecoderSink {
-    _Latin1AllowInvalidDecoderSink(sink) {
-      super._Latin1DecoderSink(sink);
-    }
-    addSlice(source, start, end, isLast) {
-      core.RangeError.checkValidRange(start, end, source.length);
-      for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let char = source.get(i);
-        if (dart.notNull(char) > dart.notNull(_LATIN1_MASK) || dart.notNull(char) < 0) {
-          if (dart.notNull(i) > dart.notNull(start))
-            this[_addSliceToSink](source, start, i, false);
-          this[_addSliceToSink](dart.as(/* Unimplemented const */new List.from([65533]), core.List$(core.int)), 0, 1, false);
-          start = dart.notNull(i) + 1;
-        }
-      }
-      if (dart.notNull(start) < dart.notNull(end)) {
-        this[_addSliceToSink](source, start, end, isLast);
-      }
-      if (isLast) {
-        this.close();
-      }
-    }
-  }
-  class LineSplitter extends Converter$(core.String, core.List$(core.String)) {
-    LineSplitter() {
-      super.Converter();
-    }
-    convert(data) {
-      let lines = new core.List();
-      _LineSplitterSink._addSlice(data, 0, data.length, true, lines.add);
-      return lines;
-    }
-    startChunkedConversion(sink) {
-      if (!dart.is(sink, StringConversionSink)) {
-        sink = new StringConversionSink.from(sink);
-      }
-      return new _LineSplitterSink(dart.as(sink, StringConversionSink));
-    }
-  }
-  let _carry = Symbol('_carry');
-  let _addSlice = Symbol('_addSlice');
-  class _LineSplitterSink extends StringConversionSinkBase {
-    _LineSplitterSink($_sink) {
-      this[_sink] = $_sink;
-      this[_carry] = null;
-      super.StringConversionSinkBase();
-    }
-    addSlice(chunk, start, end, isLast) {
-      if (this[_carry] !== null) {
-        chunk = core.String['+'](this[_carry], chunk.substring(start, end));
-        start = 0;
-        end = chunk.length;
-        this[_carry] = null;
-      }
-      this[_carry] = _addSlice(chunk, start, end, isLast, this[_sink].add);
-      if (isLast)
-        this[_sink].close();
-    }
-    close() {
-      this.addSlice('', 0, 0, true);
-    }
-    static [_addSlice](chunk, start, end, isLast, adder) {
-      let pos = start;
-      while (dart.notNull(pos) < dart.notNull(end)) {
-        let skip = 0;
-        let char = chunk.codeUnitAt(pos);
-        if (char === _LineSplitterSink._LF) {
-          skip = 1;
-        } else if (char === _LineSplitterSink._CR) {
-          skip = 1;
-          if (dart.notNull(pos) + 1 < dart.notNull(end)) {
-            if (chunk.codeUnitAt(dart.notNull(pos) + 1) === _LineSplitterSink._LF) {
-              skip = 2;
-            }
-          } else if (!dart.notNull(isLast)) {
-            return chunk.substring(start, end);
-          }
-        }
-        if (dart.notNull(skip) > 0) {
-          adder(chunk.substring(start, pos));
-          start = pos = dart.notNull(pos) + dart.notNull(skip);
-        } else {
-          pos = dart.notNull(pos) + 1;
-        }
-      }
-      if (pos !== start) {
-        let carry = chunk.substring(start, pos);
-        if (isLast) {
-          adder(carry);
-        } else {
-          return carry;
-        }
-      }
-      return null;
-    }
-  }
-  _LineSplitterSink._LF = 10;
-  _LineSplitterSink._CR = 13;
-  class StringConversionSink extends ChunkedConversionSink$(core.String) {
-    StringConversionSink() {
-      super.ChunkedConversionSink();
-    }
-    StringConversionSink$withCallback(callback) {
-      return new _StringCallbackSink(callback);
-    }
-    StringConversionSink$from(sink) {
-      return new _StringAdapterSink(sink);
-    }
-    StringConversionSink$fromStringSink(sink) {
-      return new _StringSinkConversionSink(sink);
-    }
-  }
-  dart.defineNamedConstructor(StringConversionSink, 'withCallback');
-  dart.defineNamedConstructor(StringConversionSink, 'from');
-  dart.defineNamedConstructor(StringConversionSink, 'fromStringSink');
-  class ClosableStringSink extends core.StringSink {
-    ClosableStringSink$fromStringSink(sink, onClose) {
-      return new _ClosableStringSink(sink, onClose);
-    }
-  }
-  dart.defineNamedConstructor(ClosableStringSink, 'fromStringSink');
-  class _ClosableStringSink extends core.Object {
-    _ClosableStringSink($_sink, $_callback) {
-      this[_sink] = $_sink;
-      this[_callback] = $_callback;
-    }
-    close() {
-      return this[_callback]();
-    }
-    writeCharCode(charCode) {
-      return this[_sink].writeCharCode(charCode);
-    }
-    write(o) {
-      return this[_sink].write(o);
-    }
-    writeln(o) {
-      if (o === void 0)
-        o = "";
-      return this[_sink].writeln(o);
-    }
-    writeAll(objects, separator) {
-      if (separator === void 0)
-        separator = "";
-      return this[_sink].writeAll(objects, separator);
-    }
-  }
-  let _flush = Symbol('_flush');
-  class _StringConversionSinkAsStringSinkAdapter extends core.Object {
-    _StringConversionSinkAsStringSinkAdapter($_chunkedSink) {
-      this[_chunkedSink] = $_chunkedSink;
-      this[_buffer] = new core.StringBuffer();
-    }
-    close() {
-      if (this[_buffer].isNotEmpty)
-        this[_flush]();
-      this[_chunkedSink].close();
-    }
-    writeCharCode(charCode) {
-      this[_buffer].writeCharCode(charCode);
-      if (dart.notNull(this[_buffer].length) > dart.notNull(_StringConversionSinkAsStringSinkAdapter._MIN_STRING_SIZE))
-        this[_flush]();
-    }
-    write(o) {
-      if (this[_buffer].isNotEmpty)
-        this[_flush]();
-      let str = o.toString();
-      this[_chunkedSink].add(o.toString());
-    }
-    writeln(o) {
-      if (o === void 0)
-        o = "";
-      this[_buffer].writeln(o);
-      if (dart.notNull(this[_buffer].length) > dart.notNull(_StringConversionSinkAsStringSinkAdapter._MIN_STRING_SIZE))
-        this[_flush]();
-    }
-    writeAll(objects, separator) {
-      if (separator === void 0)
-        separator = "";
-      if (this[_buffer].isNotEmpty)
-        this[_flush]();
-      let iterator = objects.iterator;
-      if (!dart.notNull(iterator.moveNext()))
-        return;
-      if (separator.isEmpty) {
-        do {
-          this[_chunkedSink].add(dart.as(dart.dinvoke(iterator.current, 'toString'), core.String));
-        } while (iterator.moveNext());
-      } else {
-        this[_chunkedSink].add(dart.as(dart.dinvoke(iterator.current, 'toString'), core.String));
-        while (iterator.moveNext()) {
-          this.write(separator);
-          this[_chunkedSink].add(dart.as(dart.dinvoke(iterator.current, 'toString'), core.String));
-        }
-      }
-    }
-    [_flush]() {
-      let accumulated = this[_buffer].toString();
-      this[_buffer].clear();
-      this[_chunkedSink].add(accumulated);
-    }
-  }
-  _StringConversionSinkAsStringSinkAdapter._MIN_STRING_SIZE = 16;
-  let _stringSink = Symbol('_stringSink');
-  class _StringSinkConversionSink extends StringConversionSinkBase {
-    _StringSinkConversionSink($_stringSink) {
-      this[_stringSink] = $_stringSink;
-      super.StringConversionSinkBase();
-    }
-    close() {}
-    addSlice(str, start, end, isLast) {
-      if (start !== 0 || end !== str.length) {
-        for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-          this[_stringSink].writeCharCode(str.codeUnitAt(i));
-        }
-      } else {
-        this[_stringSink].write(str);
-      }
-      if (isLast)
-        this.close();
-    }
-    add(str) {
-      return this[_stringSink].write(str);
-    }
-    asUtf8Sink(allowMalformed) {
-      return new _Utf8StringSinkAdapter(this, this[_stringSink], allowMalformed);
-    }
-    asStringSink() {
-      return new ClosableStringSink.fromStringSink(this[_stringSink], this.close);
-    }
-  }
-  class _StringCallbackSink extends _StringSinkConversionSink {
-    _StringCallbackSink($_callback) {
-      this[_callback] = $_callback;
-      super._StringSinkConversionSink(new core.StringBuffer());
-    }
-    close() {
-      let buffer = dart.as(this[_stringSink], core.StringBuffer);
-      let accumulated = buffer.toString();
-      buffer.clear();
-      this[_callback](accumulated);
-    }
-    asUtf8Sink(allowMalformed) {
-      return new _Utf8StringSinkAdapter(this, this[_stringSink], allowMalformed);
-    }
-  }
-  class _StringAdapterSink extends StringConversionSinkBase {
-    _StringAdapterSink($_sink) {
-      this[_sink] = $_sink;
-      super.StringConversionSinkBase();
-    }
-    add(str) {
-      return this[_sink].add(str);
-    }
-    addSlice(str, start, end, isLast) {
-      if (start === 0 && end === str.length) {
-        this.add(str);
-      } else {
-        this.add(str.substring(start, end));
-      }
-      if (isLast)
-        this.close();
-    }
-    close() {
-      return this[_sink].close();
-    }
-  }
-  let _decoder = Symbol('_decoder');
-  class _Utf8StringSinkAdapter extends ByteConversionSink {
-    _Utf8StringSinkAdapter($_sink, stringSink, allowMalformed) {
-      this[_sink] = $_sink;
-      this[_decoder] = new _Utf8Decoder(stringSink, allowMalformed);
-      super.ByteConversionSink();
-    }
-    close() {
-      this[_decoder].close();
-      if (this[_sink] !== null)
-        this[_sink].close();
-    }
-    add(chunk) {
-      this.addSlice(chunk, 0, chunk.length, false);
-    }
-    addSlice(codeUnits, startIndex, endIndex, isLast) {
-      this[_decoder].convert(codeUnits, startIndex, endIndex);
-      if (isLast)
-        this.close();
-    }
-  }
-  let _Utf8ConversionSink$_ = Symbol('_Utf8ConversionSink$_');
-  class _Utf8ConversionSink extends ByteConversionSink {
-    _Utf8ConversionSink(sink, allowMalformed) {
-      this[_Utf8ConversionSink$_](sink, new core.StringBuffer(), allowMalformed);
-    }
-    _Utf8ConversionSink$_($_chunkedSink, stringBuffer, allowMalformed) {
-      this[_chunkedSink] = $_chunkedSink;
-      this[_decoder] = new _Utf8Decoder(stringBuffer, allowMalformed);
-      this[_buffer] = stringBuffer;
-      super.ByteConversionSink();
-    }
-    close() {
-      this[_decoder].close();
-      if (this[_buffer].isNotEmpty) {
-        let accumulated = this[_buffer].toString();
-        this[_buffer].clear();
-        this[_chunkedSink].addSlice(accumulated, 0, accumulated.length, true);
-      } else {
-        this[_chunkedSink].close();
-      }
-    }
-    add(chunk) {
-      this.addSlice(chunk, 0, chunk.length, false);
-    }
-    addSlice(chunk, startIndex, endIndex, isLast) {
-      this[_decoder].convert(chunk, startIndex, endIndex);
-      if (this[_buffer].isNotEmpty) {
-        let accumulated = this[_buffer].toString();
-        this[_chunkedSink].addSlice(accumulated, 0, accumulated.length, isLast);
-        this[_buffer].clear();
-        return;
-      }
-      if (isLast)
-        this.close();
-    }
-  }
-  dart.defineNamedConstructor(_Utf8ConversionSink, '_');
-  let UNICODE_REPLACEMENT_CHARACTER_RUNE = 65533;
-  let UNICODE_BOM_CHARACTER_RUNE = 65279;
-  let UTF8 = new Utf8Codec();
-  let _allowMalformed = Symbol('_allowMalformed');
-  class Utf8Codec extends Encoding {
-    Utf8Codec(opt$) {
-      let allowMalformed = opt$.allowMalformed === void 0 ? false : opt$.allowMalformed;
-      this[_allowMalformed] = allowMalformed;
-      super.Encoding();
-    }
-    get name() {
-      return "utf-8";
-    }
-    decode(codeUnits, opt$) {
-      let allowMalformed = opt$.allowMalformed === void 0 ? null : opt$.allowMalformed;
-      if (allowMalformed === null)
-        allowMalformed = this[_allowMalformed];
-      return new Utf8Decoder({allowMalformed: allowMalformed}).convert(codeUnits);
-    }
-    get encoder() {
-      return new Utf8Encoder();
-    }
-    get decoder() {
-      return new Utf8Decoder({allowMalformed: this[_allowMalformed]});
-    }
-  }
-  class Utf8Encoder extends Converter$(core.String, core.List$(core.int)) {
-    Utf8Encoder() {
-      super.Converter();
-    }
-    convert(string, start, end) {
-      if (start === void 0)
-        start = 0;
-      if (end === void 0)
-        end = null;
-      let stringLength = string.length;
-      core.RangeError.checkValidRange(start, end, stringLength);
-      if (end === null)
-        end = stringLength;
-      let length = dart.notNull(end) - dart.notNull(start);
-      if (length === 0)
-        return new typed_data.Uint8List(0);
-      let encoder = new _Utf8Encoder.withBufferSize(dart.notNull(length) * 3);
-      let endPosition = encoder._fillBuffer(string, start, end);
-      dart.assert(dart.notNull(endPosition) >= dart.notNull(end) - 1);
-      if (endPosition !== end) {
-        let lastCodeUnit = string.codeUnitAt(dart.notNull(end) - 1);
-        dart.assert(_isLeadSurrogate(lastCodeUnit));
-        let wasCombined = encoder._writeSurrogate(lastCodeUnit, 0);
-        dart.assert(!dart.notNull(wasCombined));
-      }
-      return encoder[_buffer].sublist(0, encoder[_bufferIndex]);
-    }
-    startChunkedConversion(sink) {
-      if (!dart.is(sink, ByteConversionSink)) {
-        sink = new ByteConversionSink.from(sink);
-      }
-      return new _Utf8EncoderSink(dart.as(sink, ByteConversionSink));
-    }
-    bind(stream) {
-      return dart.as(super.bind(stream), async.Stream$(core.List$(core.int)));
-    }
-  }
-  let _Utf8Encoder$withBufferSize = Symbol('_Utf8Encoder$withBufferSize');
-  let _createBuffer = Symbol('_createBuffer');
-  let _writeSurrogate = Symbol('_writeSurrogate');
-  let _fillBuffer = Symbol('_fillBuffer');
-  class _Utf8Encoder extends core.Object {
-    _Utf8Encoder() {
-      this[_Utf8Encoder$withBufferSize](_Utf8Encoder._DEFAULT_BYTE_BUFFER_SIZE);
-    }
-    _Utf8Encoder$withBufferSize(bufferSize) {
-      this[_buffer] = _createBuffer(bufferSize);
-      this[_carry] = 0;
-      this[_bufferIndex] = 0;
-    }
-    static [_createBuffer](size) {
-      return new typed_data.Uint8List(size);
-    }
-    [_writeSurrogate](leadingSurrogate, nextCodeUnit) {
-      if (_isTailSurrogate(nextCodeUnit)) {
-        let rune = _combineSurrogatePair(leadingSurrogate, nextCodeUnit);
-        dart.assert(dart.notNull(rune) > dart.notNull(_THREE_BYTE_LIMIT));
-        dart.assert(dart.notNull(rune) <= dart.notNull(_FOUR_BYTE_LIMIT));
-        this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 240 | dart.notNull(rune) >> 18);
-        this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(rune) >> 12 & 63);
-        this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(rune) >> 6 & 63);
-        this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(rune) & 63);
-        return true;
-      } else {
-        this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 224 | dart.notNull(leadingSurrogate) >> 12);
-        this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(leadingSurrogate) >> 6 & 63);
-        this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(leadingSurrogate) & 63);
-        return false;
-      }
-    }
-    [_fillBuffer](str, start, end) {
-      if (start !== end && dart.notNull(_isLeadSurrogate(str.codeUnitAt(dart.notNull(end) - 1)))) {
-        end = dart.notNull(end) - 1;
-      }
-      let stringIndex = null;
-      for (stringIndex = start; dart.notNull(stringIndex) < dart.notNull(end); stringIndex = dart.notNull(stringIndex) + 1) {
-        let codeUnit = str.codeUnitAt(stringIndex);
-        if (dart.notNull(codeUnit) <= dart.notNull(_ONE_BYTE_LIMIT)) {
-          if (dart.notNull(this[_bufferIndex]) >= dart.notNull(this[_buffer].length))
-            break;
-          this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), codeUnit);
-        } else if (_isLeadSurrogate(codeUnit)) {
-          if (dart.notNull(this[_bufferIndex]) + 3 >= dart.notNull(this[_buffer].length))
-            break;
-          let nextCodeUnit = str.codeUnitAt(dart.notNull(stringIndex) + 1);
-          let wasCombined = this[_writeSurrogate](codeUnit, nextCodeUnit);
-          if (wasCombined)
-            stringIndex = dart.notNull(stringIndex) + 1;
-        } else {
-          let rune = codeUnit;
-          if (dart.notNull(rune) <= dart.notNull(_TWO_BYTE_LIMIT)) {
-            if (dart.notNull(this[_bufferIndex]) + 1 >= dart.notNull(this[_buffer].length))
-              break;
-            this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 192 | dart.notNull(rune) >> 6);
-            this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(rune) & 63);
-          } else {
-            dart.assert(dart.notNull(rune) <= dart.notNull(_THREE_BYTE_LIMIT));
-            if (dart.notNull(this[_bufferIndex]) + 2 >= dart.notNull(this[_buffer].length))
-              break;
-            this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 224 | dart.notNull(rune) >> 12);
-            this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(rune) >> 6 & 63);
-            this[_buffer].set((($tmp) => this[_bufferIndex] = dart.notNull($tmp) + 1, $tmp).bind(this)(this[_bufferIndex]), 128 | dart.notNull(rune) & 63);
-          }
-        }
-      }
-      return stringIndex;
-    }
-  }
-  dart.defineNamedConstructor(_Utf8Encoder, 'withBufferSize');
-  _Utf8Encoder._DEFAULT_BYTE_BUFFER_SIZE = 1024;
-  class _Utf8EncoderSink extends dart.mixin(_Utf8Encoder, StringConversionSinkMixin) {
-    _Utf8EncoderSink($_sink) {
-      this[_sink] = $_sink;
-      super._Utf8Encoder();
-    }
-    close() {
-      if (this[_carry] !== 0) {
-        this.addSlice("", 0, 0, true);
-        return;
-      }
-      this[_sink].close();
-    }
-    addSlice(str, start, end, isLast) {
-      this[_bufferIndex] = 0;
-      if (start === end && !dart.notNull(isLast)) {
-        return;
-      }
-      if (this[_carry] !== 0) {
-        let nextCodeUnit = 0;
-        if (start !== end) {
-          nextCodeUnit = str.codeUnitAt(start);
-        } else {
-          dart.assert(isLast);
-        }
-        let wasCombined = this[_writeSurrogate](this[_carry], nextCodeUnit);
-        dart.assert(!dart.notNull(wasCombined) || start !== end);
-        if (wasCombined)
-          start = dart.notNull(start) + 1;
-        this[_carry] = 0;
-      }
-      do {
-        start = this[_fillBuffer](str, start, end);
-        let isLastSlice = dart.notNull(isLast) && start === end;
-        if (start === dart.notNull(end) - 1 && dart.notNull(_isLeadSurrogate(str.codeUnitAt(start)))) {
-          if (dart.notNull(isLast) && dart.notNull(this[_bufferIndex]) < dart.notNull(this[_buffer].length) - 3) {
-            let hasBeenCombined = this[_writeSurrogate](str.codeUnitAt(start), 0);
-            dart.assert(!dart.notNull(hasBeenCombined));
-          } else {
-            this[_carry] = str.codeUnitAt(start);
-          }
-          start = dart.notNull(start) + 1;
-        }
-        this[_sink].addSlice(this[_buffer], 0, this[_bufferIndex], isLastSlice);
-        this[_bufferIndex] = 0;
-      } while (dart.notNull(start) < dart.notNull(end));
-      if (isLast)
-        this.close();
-    }
-  }
-  class Utf8Decoder extends Converter$(core.List$(core.int), core.String) {
-    Utf8Decoder(opt$) {
-      let allowMalformed = opt$.allowMalformed === void 0 ? false : opt$.allowMalformed;
-      this[_allowMalformed] = allowMalformed;
-      super.Converter();
-    }
-    convert(codeUnits, start, end) {
-      if (start === void 0)
-        start = 0;
-      if (end === void 0)
-        end = null;
-      let length = codeUnits.length;
-      core.RangeError.checkValidRange(start, end, length);
-      if (end === null)
-        end = length;
-      let buffer = new core.StringBuffer();
-      let decoder = new _Utf8Decoder(buffer, this[_allowMalformed]);
-      decoder.convert(codeUnits, start, end);
-      decoder.close();
-      return buffer.toString();
-    }
-    startChunkedConversion(sink) {
-      let stringSink = null;
-      if (dart.is(sink, StringConversionSink)) {
-        stringSink = sink;
-      } else {
-        stringSink = new StringConversionSink.from(sink);
-      }
-      return stringSink.asUtf8Sink(this[_allowMalformed]);
-    }
-    bind(stream) {
-      return dart.as(super.bind(stream), async.Stream$(core.String));
-    }
-    fuse(next) {
-      return super.fuse(next);
-    }
-  }
-  let _ONE_BYTE_LIMIT = 127;
-  let _TWO_BYTE_LIMIT = 2047;
-  let _THREE_BYTE_LIMIT = 65535;
-  let _FOUR_BYTE_LIMIT = 1114111;
-  let _SURROGATE_MASK = 63488;
-  let _SURROGATE_TAG_MASK = 64512;
-  let _SURROGATE_VALUE_MASK = 1023;
-  let _LEAD_SURROGATE_MIN = 55296;
-  let _TAIL_SURROGATE_MIN = 56320;
-  // Function _isSurrogate: (int) → bool
-  function _isSurrogate(codeUnit) {
-    return (dart.notNull(codeUnit) & dart.notNull(_SURROGATE_MASK)) === _LEAD_SURROGATE_MIN;
-  }
-  // Function _isLeadSurrogate: (int) → bool
-  function _isLeadSurrogate(codeUnit) {
-    return (dart.notNull(codeUnit) & dart.notNull(_SURROGATE_TAG_MASK)) === _LEAD_SURROGATE_MIN;
-  }
-  // Function _isTailSurrogate: (int) → bool
-  function _isTailSurrogate(codeUnit) {
-    return (dart.notNull(codeUnit) & dart.notNull(_SURROGATE_TAG_MASK)) === _TAIL_SURROGATE_MIN;
-  }
-  // Function _combineSurrogatePair: (int, int) → int
-  function _combineSurrogatePair(lead, tail) {
-    return 65536 + ((dart.notNull(lead) & dart.notNull(_SURROGATE_VALUE_MASK)) << 10) | dart.notNull(tail) & dart.notNull(_SURROGATE_VALUE_MASK);
-  }
-  let _isFirstCharacter = Symbol('_isFirstCharacter');
-  let _value = Symbol('_value');
-  let _expectedUnits = Symbol('_expectedUnits');
-  let _extraUnits = Symbol('_extraUnits');
-  class _Utf8Decoder extends core.Object {
-    _Utf8Decoder($_stringSink, $_allowMalformed) {
-      this[_stringSink] = $_stringSink;
-      this[_allowMalformed] = $_allowMalformed;
-      this[_isFirstCharacter] = true;
-      this[_value] = 0;
-      this[_expectedUnits] = 0;
-      this[_extraUnits] = 0;
-    }
-    get hasPartialInput() {
-      return dart.notNull(this[_expectedUnits]) > 0;
-    }
-    close() {
-      this.flush();
-    }
-    flush() {
-      if (this.hasPartialInput) {
-        if (!dart.notNull(this[_allowMalformed])) {
-          throw new core.FormatException("Unfinished UTF-8 octet sequence");
-        }
-        this[_stringSink].writeCharCode(UNICODE_REPLACEMENT_CHARACTER_RUNE);
-        this[_value] = 0;
-        this[_expectedUnits] = 0;
-        this[_extraUnits] = 0;
-      }
-    }
-    convert(codeUnits, startIndex, endIndex) {
-      let value = this[_value];
-      let expectedUnits = this[_expectedUnits];
-      let extraUnits = this[_extraUnits];
-      this[_value] = 0;
-      this[_expectedUnits] = 0;
-      this[_extraUnits] = 0;
-      // Function scanOneByteCharacters: (dynamic, int) → int
-      function scanOneByteCharacters(units, from) {
-        let to = endIndex;
-        let mask = _ONE_BYTE_LIMIT;
-        for (let i = from; dart.notNull(i) < dart.notNull(to); i = dart.notNull(i) + 1) {
-          let unit = dart.dindex(units, i);
-          if (!dart.equals(dart.dbinary(unit, '&', mask), unit))
-            return dart.notNull(i) - dart.notNull(from);
-        }
-        return dart.notNull(to) - dart.notNull(from);
-      }
-      // Function addSingleBytes: (int, int) → void
-      function addSingleBytes(from, to) {
-        dart.assert(dart.notNull(from) >= dart.notNull(startIndex) && dart.notNull(from) <= dart.notNull(endIndex));
-        dart.assert(dart.notNull(to) >= dart.notNull(startIndex) && dart.notNull(to) <= dart.notNull(endIndex));
-        this[_stringSink].write(new core.String.fromCharCodes(codeUnits, from, to));
-      }
-      let i = startIndex;
-      loop:
-        while (true) {
-          multibyte:
-            if (dart.notNull(expectedUnits) > 0) {
-              do {
-                if (i === endIndex) {
-                  break loop;
-                }
-                let unit = codeUnits.get(i);
-                if ((dart.notNull(unit) & 192) !== 128) {
-                  expectedUnits = 0;
-                  if (!dart.notNull(this[_allowMalformed])) {
-                    throw new core.FormatException(`Bad UTF-8 encoding 0x${unit.toRadixString(16)}`);
-                  }
-                  this[_isFirstCharacter] = false;
-                  this[_stringSink].writeCharCode(UNICODE_REPLACEMENT_CHARACTER_RUNE);
-                  break multibyte;
-                } else {
-                  value = dart.notNull(value) << 6 | dart.notNull(unit) & 63;
-                  expectedUnits = dart.notNull(expectedUnits) - 1;
-                  i = dart.notNull(i) + 1;
-                }
-              } while (dart.notNull(expectedUnits) > 0);
-              if (dart.notNull(value) <= dart.notNull(_Utf8Decoder._LIMITS.get(dart.notNull(extraUnits) - 1))) {
-                if (!dart.notNull(this[_allowMalformed])) {
-                  throw new core.FormatException(`Overlong encoding of 0x${value.toRadixString(16)}`);
-                }
-                expectedUnits = extraUnits = 0;
-                value = UNICODE_REPLACEMENT_CHARACTER_RUNE;
-              }
-              if (dart.notNull(value) > dart.notNull(_FOUR_BYTE_LIMIT)) {
-                if (!dart.notNull(this[_allowMalformed])) {
-                  throw new core.FormatException("Character outside valid Unicode range: " + `0x${value.toRadixString(16)}`);
-                }
-                value = UNICODE_REPLACEMENT_CHARACTER_RUNE;
-              }
-              if (!dart.notNull(this[_isFirstCharacter]) || value !== UNICODE_BOM_CHARACTER_RUNE) {
-                this[_stringSink].writeCharCode(value);
-              }
-              this[_isFirstCharacter] = false;
-            }
-          while (dart.notNull(i) < dart.notNull(endIndex)) {
-            let oneBytes = scanOneByteCharacters(codeUnits, i);
-            if (dart.notNull(oneBytes) > 0) {
-              this[_isFirstCharacter] = false;
-              addSingleBytes(i, dart.notNull(i) + dart.notNull(oneBytes));
-              i = oneBytes;
-              if (i === endIndex)
-                break;
-            }
-            let unit = codeUnits.get((($tmp) => i = dart.notNull($tmp) + 1, $tmp)(i));
-            if (dart.notNull(unit) < 0) {
-              if (!dart.notNull(this[_allowMalformed])) {
-                throw new core.FormatException(`Negative UTF-8 code unit: -0x${(-dart.notNull(unit)).toRadixString(16)}`);
-              }
-              this[_stringSink].writeCharCode(UNICODE_REPLACEMENT_CHARACTER_RUNE);
-            } else {
-              dart.assert(dart.notNull(unit) > dart.notNull(_ONE_BYTE_LIMIT));
-              if ((dart.notNull(unit) & 224) === 192) {
-                value = dart.notNull(unit) & 31;
-                expectedUnits = extraUnits = 1;
-                continue loop;
-              }
-              if ((dart.notNull(unit) & 240) === 224) {
-                value = dart.notNull(unit) & 15;
-                expectedUnits = extraUnits = 2;
-                continue loop;
-              }
-              if ((dart.notNull(unit) & 248) === 240 && dart.notNull(unit) < 245) {
-                value = dart.notNull(unit) & 7;
-                expectedUnits = extraUnits = 3;
-                continue loop;
-              }
-              if (!dart.notNull(this[_allowMalformed])) {
-                throw new core.FormatException(`Bad UTF-8 encoding 0x${unit.toRadixString(16)}`);
-              }
-              value = UNICODE_REPLACEMENT_CHARACTER_RUNE;
-              expectedUnits = extraUnits = 0;
-              this[_isFirstCharacter] = false;
-              this[_stringSink].writeCharCode(value);
-            }
-          }
-          break loop;
-        }
-      if (dart.notNull(expectedUnits) > 0) {
-        this[_value] = value;
-        this[_expectedUnits] = expectedUnits;
-        this[_extraUnits] = extraUnits;
-      }
-    }
-  }
-  _Utf8Decoder._LIMITS = /* Unimplemented const */new List.from([_ONE_BYTE_LIMIT, _TWO_BYTE_LIMIT, _THREE_BYTE_LIMIT, _FOUR_BYTE_LIMIT]);
-  let _processed = Symbol('_processed');
-  let _original = Symbol('_original');
-  // Function _convertJsonToDart: (dynamic, (dynamic, dynamic) → dynamic) → dynamic
-  function _convertJsonToDart(json, reviver) {
-    dart.assert(reviver !== null);
-    // Function walk: (dynamic) → dynamic
-    function walk(e) {
-      if (e == null || typeof e != "object") {
-        return e;
-      }
-      if (Object.getPrototypeOf(e) === Array.prototype) {
-        for (let i = 0; dart.notNull(i) < e.length; i = dart.notNull(i) + 1) {
-          let item = e[i];
-          e[i] = dart.dinvokef(reviver, i, walk(item));
-        }
-        return e;
-      }
-      let map = new _JsonMap(e);
-      let processed = map[_processed];
-      let keys = map._computeKeys();
-      for (let i = 0; dart.notNull(i) < dart.notNull(keys.length); i = dart.notNull(i) + 1) {
-        let key = keys.get(i);
-        let revived = dart.dinvokef(reviver, key, walk(e[key]));
-        processed[key] = revived;
-      }
-      map[_original] = processed;
-      return map;
-    }
-    return dart.dinvokef(reviver, null, walk(json));
-  }
-  // Function _convertJsonToDartLazy: (dynamic) → dynamic
-  function _convertJsonToDartLazy(object) {
-    if (object === null)
-      return null;
-    if (typeof object != "object") {
-      return object;
-    }
-    if (Object.getPrototypeOf(object) !== Array.prototype) {
-      return new _JsonMap(object);
-    }
-    for (let i = 0; dart.notNull(i) < object.length; i = dart.notNull(i) + 1) {
-      let item = object[i];
-      object[i] = _convertJsonToDartLazy(item);
-    }
-    return object;
-  }
-  let _data = Symbol('_data');
-  let _isUpgraded = Symbol('_isUpgraded');
-  let _upgradedMap = Symbol('_upgradedMap');
-  let _process = Symbol('_process');
-  let _computeKeys = Symbol('_computeKeys');
-  let _upgrade = Symbol('_upgrade');
-  let _hasProperty = Symbol('_hasProperty');
-  let _getProperty = Symbol('_getProperty');
-  let _setProperty = Symbol('_setProperty');
-  let _getPropertyNames = Symbol('_getPropertyNames');
-  let _isUnprocessed = Symbol('_isUnprocessed');
-  let _newJavaScriptObject = Symbol('_newJavaScriptObject');
-  class _JsonMap extends core.Object {
-    _JsonMap($_original) {
-      this[_processed] = _newJavaScriptObject();
-      this[_original] = $_original;
-      this[_data] = null;
-    }
-    get(key) {
-      if (this[_isUpgraded]) {
-        return this[_upgradedMap].get(key);
-      } else if (!(typeof key == string)) {
-        return null;
-      } else {
-        let result = _getProperty(this[_processed], dart.as(key, core.String));
-        if (_isUnprocessed(result))
-          result = this[_process](dart.as(key, core.String));
-        return result;
-      }
-    }
-    get length() {
-      return this[_isUpgraded] ? this[_upgradedMap].length : this[_computeKeys]().length;
-    }
-    get isEmpty() {
-      return this.length === 0;
-    }
-    get isNotEmpty() {
-      return dart.notNull(this.length) > 0;
-    }
-    get keys() {
-      if (this[_isUpgraded])
-        return this[_upgradedMap].keys;
-      return new _JsonMapKeyIterable(this);
-    }
-    get values() {
-      if (this[_isUpgraded])
-        return this[_upgradedMap].values;
-      return new _internal.MappedIterable(this[_computeKeys](), ((each) => this.get(each)).bind(this));
-    }
-    set(key, value) {
-      if (this[_isUpgraded]) {
-        this[_upgradedMap].set(key, value);
-      } else if (this.containsKey(key)) {
-        let processed = this[_processed];
-        _setProperty(processed, dart.as(key, core.String), value);
-        let original = this[_original];
-        if (!dart.notNull(core.identical(original, processed))) {
-          _setProperty(original, dart.as(key, core.String), null);
-        }
-      } else {
-        this[_upgrade]().set(key, value);
-      }
-    }
-    addAll(other) {
-      other.forEach(((key, value) => {
-        this.set(key, value);
-      }).bind(this));
-    }
-    containsValue(value) {
-      if (this[_isUpgraded])
-        return this[_upgradedMap].containsValue(value);
-      let keys = this[_computeKeys]();
-      for (let i = 0; dart.notNull(i) < dart.notNull(keys.length); i = dart.notNull(i) + 1) {
-        let key = keys.get(i);
-        if (dart.equals(this.get(key), value))
-          return true;
-      }
-      return false;
-    }
-    containsKey(key) {
-      if (this[_isUpgraded])
-        return this[_upgradedMap].containsKey(key);
-      if (!(typeof key == string))
-        return false;
-      return _hasProperty(this[_original], dart.as(key, core.String));
-    }
-    putIfAbsent(key, ifAbsent) {
-      if (this.containsKey(key))
-        return this.get(key);
-      let value = ifAbsent();
-      this.set(key, value);
-      return value;
-    }
-    remove(key) {
-      if (!dart.notNull(this[_isUpgraded]) && !dart.notNull(this.containsKey(key)))
-        return null;
-      return this[_upgrade]().remove(key);
-    }
-    clear() {
-      if (this[_isUpgraded]) {
-        this[_upgradedMap].clear();
-      } else {
-        if (this[_data] !== null) {
-          dart.dinvoke(this[_data], 'clear');
-        }
-        this[_original] = this[_processed] = null;
-        this[_data] = dart.map();
-      }
-    }
-    forEach(f) {
-      if (this[_isUpgraded])
-        return this[_upgradedMap].forEach(f);
-      let keys = this[_computeKeys]();
-      for (let i = 0; dart.notNull(i) < dart.notNull(keys.length); i = dart.notNull(i) + 1) {
-        let key = keys.get(i);
-        let value = _getProperty(this[_processed], key);
-        if (_isUnprocessed(value)) {
-          value = _convertJsonToDartLazy(_getProperty(this[_original], key));
-          _setProperty(this[_processed], key, value);
-        }
-        dart.dinvokef(f, key, value);
-        if (!dart.notNull(core.identical(keys, this[_data]))) {
-          throw new core.ConcurrentModificationError(this);
-        }
-      }
-    }
-    toString() {
-      return collection.Maps.mapToString(this);
-    }
-    get [_isUpgraded]() {
-      return this[_processed] === null;
-    }
-    get [_upgradedMap]() {
-      dart.assert(this[_isUpgraded]);
-      return dart.as(this[_data], core.Map);
-    }
-    [_computeKeys]() {
-      dart.assert(!dart.notNull(this[_isUpgraded]));
-      let keys = dart.as(this[_data], core.List);
-      if (keys === null) {
-        keys = this[_data] = _getPropertyNames(this[_original]);
-      }
-      return dart.as(keys, core.List$(core.String));
-    }
-    [_upgrade]() {
-      if (this[_isUpgraded])
-        return this[_upgradedMap];
-      let result = dart.map();
-      let keys = this[_computeKeys]();
-      for (let i = 0; dart.notNull(i) < dart.notNull(keys.length); i = dart.notNull(i) + 1) {
-        let key = keys.get(i);
-        result.set(key, this.get(key));
-      }
-      if (keys.isEmpty) {
-        keys.add(null);
-      } else {
-        keys.clear();
-      }
-      this[_original] = this[_processed] = null;
-      this[_data] = result;
-      dart.assert(this[_isUpgraded]);
-      return result;
-    }
-    [_process](key) {
-      if (!dart.notNull(_hasProperty(this[_original], key)))
-        return null;
-      let result = _convertJsonToDartLazy(_getProperty(this[_original], key));
-      return _setProperty(this[_processed], key, result);
-    }
-    static [_hasProperty](object, key) {
-      return Object.prototype.hasOwnProperty.call(object, key);
-    }
-    static [_getProperty](object, key) {
-      return object[key];
-    }
-    static [_setProperty](object, key, value) {
-      return object[key] = value;
-    }
-    static [_getPropertyNames](object) {
-      return dart.as(Object.keys(object), core.List);
-    }
-    static [_isUnprocessed](object) {
-      return typeof object == "undefined";
-    }
-    static [_newJavaScriptObject]() {
-      return Object.create(null);
-    }
-  }
-  let _parent = Symbol('_parent');
-  class _JsonMapKeyIterable extends _internal.ListIterable {
-    _JsonMapKeyIterable($_parent) {
-      this[_parent] = $_parent;
-      super.ListIterable();
-    }
-    get length() {
-      return this[_parent].length;
-    }
-    elementAt(index) {
-      return dart.as(this[_parent][_isUpgraded] ? this[_parent].keys.elementAt(index) : this[_parent]._computeKeys().get(index), core.String);
-    }
-    get iterator() {
-      return dart.as(this[_parent][_isUpgraded] ? this[_parent].keys.iterator : this[_parent]._computeKeys().iterator, core.Iterator);
-    }
-    contains(key) {
-      return this[_parent].containsKey(key);
-    }
-  }
-  class _JsonDecoderSink extends _StringSinkConversionSink {
-    _JsonDecoderSink($_reviver, $_sink) {
-      this[_reviver] = $_reviver;
-      this[_sink] = $_sink;
-      super._StringSinkConversionSink(new core.StringBuffer());
-    }
-    close() {
-      super.close();
-      let buffer = dart.as(this[_stringSink], core.StringBuffer);
-      let accumulated = buffer.toString();
-      buffer.clear();
-      let decoded = _parseJson(accumulated, this[_reviver]);
-      this[_sink].add(decoded);
-      this[_sink].close();
-    }
-  }
-  // Exports:
-  exports.ASCII = ASCII;
-  exports.AsciiCodec = AsciiCodec;
-  exports.Encoding = Encoding;
-  exports.Codec = Codec;
-  exports.Codec$ = Codec$;
-  exports.Converter = Converter;
-  exports.Converter$ = Converter$;
-  exports.AsciiEncoder = AsciiEncoder;
-  exports.StringConversionSinkBase = StringConversionSinkBase;
-  exports.StringConversionSinkMixin = StringConversionSinkMixin;
-  exports.AsciiDecoder = AsciiDecoder;
-  exports.ByteConversionSinkBase = ByteConversionSinkBase;
-  exports.ByteConversionSink = ByteConversionSink;
-  exports.ChunkedConversionSink = ChunkedConversionSink;
-  exports.ChunkedConversionSink$ = ChunkedConversionSink$;
-  exports.HTML_ESCAPE = HTML_ESCAPE;
-  exports.HtmlEscapeMode = HtmlEscapeMode;
-  exports.HtmlEscape = HtmlEscape;
-  exports.JsonUnsupportedObjectError = JsonUnsupportedObjectError;
-  exports.JsonCyclicError = JsonCyclicError;
-  exports.JSON = JSON;
-  exports.JsonCodec = JsonCodec;
-  exports.JsonEncoder = JsonEncoder;
-  exports.JsonUtf8Encoder = JsonUtf8Encoder;
-  exports.JsonDecoder = JsonDecoder;
-  exports.LATIN1 = LATIN1;
-  exports.Latin1Codec = Latin1Codec;
-  exports.Latin1Encoder = Latin1Encoder;
-  exports.Latin1Decoder = Latin1Decoder;
-  exports.LineSplitter = LineSplitter;
-  exports.StringConversionSink = StringConversionSink;
-  exports.ClosableStringSink = ClosableStringSink;
-  exports.UNICODE_REPLACEMENT_CHARACTER_RUNE = UNICODE_REPLACEMENT_CHARACTER_RUNE;
-  exports.UNICODE_BOM_CHARACTER_RUNE = UNICODE_BOM_CHARACTER_RUNE;
-  exports.UTF8 = UTF8;
-  exports.Utf8Codec = Utf8Codec;
-  exports.Utf8Encoder = Utf8Encoder;
-  exports.Utf8Decoder = Utf8Decoder;
-})(convert || (convert = {}));