Strip more unused features.

test/facade_converter_test.ts

 /// <reference path="../typings/mocha/mocha.d.ts"/>
 import * as fs from 'fs';
-import {expectTranslate, FAKE_MAIN, translateSource} from './test_support';
-import chai = require('chai');
+
+import {expectTranslate, FAKE_MAIN} from './test_support';
 
 let es6RuntimeDeclarations = `
     interface Iterable<T> {}
     interface Symbol {}
     interface Map<K, V> {
       get(key: K): V;
       has(key: K): boolean;
       set(key: K, value: V): Map<K, V>;
       size: number;
       delete(key: K): boolean;
       forEach(callbackfn: (value: V, index: K, map: Map<K, V>) => void, thisArg?: any): void;
     }
     interface Array<T> {
       find(predicate: (value: T, index: number, obj: Array<T>) => boolean, thisArg?: any): T;
     }
     declare var Map: {
       new<K, V>(): Map<any, any>;
       prototype: Map<any, any>;
     };
     declare var Symbol;
     `;
 
 
 function getSources(str: string): {[k: string]: string} {
   let srcs: {[k: string]: string} = {
     'some/path/to/typings/es6-shim/es6-shim': es6RuntimeDeclarations,
-    'angular2/src/core/di/forward_ref.d.ts': `
-        export declare function forwardRef<T>(x: T): T;`,
     'some/path/to/typings/es6-promise/es6-promise.d.ts':
         fs.readFileSync('typings/es6-promise/es6-promise.d.ts', 'utf-8'),
-    'node_modules/rxjs/Observable.d.ts': `
-        export declare class Observable {}`,
-    'angular2/src/facade/async.ts': `
-        export {Observable} from 'rxjs/Observable';`,
-    'angular2/src/facade/collection.ts': `
-        export declare var Map;`,
-    'angular2/src/facade/lang.d.ts': `
-        interface List<T> extends Array<T> {}
-        export declare function CONST_EXPR<T>(x: T): T;
-        export declare var normalizeBlank: (x: Object) => any;`,
     'other/file.ts': `
         export class X {
           map(x: number): string { return String(x); }
           static get(m: any, k: string): number { return m[k]; }
         }
         export class Promise {}
     `,
   };
   srcs[FAKE_MAIN] = str;
   return srcs;
 }
 
 const COMPILE_OPTS = {
   translateBuiltins: true,
   failFast: true,
   typingsRoot: 'some/path/to/typings/',
 };
 
 function expectWithTypes(str: string) {
   return expectTranslate(getSources(str), COMPILE_OPTS);
 }
 
-function expectErroneousWithType(str: string) {
-  return chai.expect(() => translateSource(getSources(str), COMPILE_OPTS));
-}
-
 describe('type based translation', () => {
   describe('Dart type substitution', () => {
     it('finds registered substitutions', () => {
-      expectWithTypes(
-          'import {Observable} from "angular2/src/facade/async"; var o: Observable<Date>;')
-          .to.equal(`import "package:angular2/src/facade/async.dart" show Stream;
+      expectWithTypes('const n: Node;').to.equal(`import "dart:html";
 
-Stream<DateTime> o;`);
-      expectWithTypes('var p: Promise<void> = x;').to.equal(`import "dart:async";
+@JS()
+external Node get n;`);
+      expectWithTypes('const xhr: XMLHttpRequest;').to.equal(`import "dart:html";
 
-Future p = x;`);
-      expectWithTypes('var y: Promise;').to.equal(`import "dart:async";
+@JS()
+external HttpRequest get xhr;`);
+      expectWithTypes('const intArray: Uint8Array;').to.equal(`import "dart:typed_data";
 
-Future y;`);
-      expectWithTypes('var n: Node;').to.equal('dynamic n;');
-      expectWithTypes('var xhr: XMLHttpRequest;').to.equal(`import "dart:html";
+@JS()
+external Uint8List get intArray;`);
+      expectWithTypes('const buff: ArrayBuffer;').to.equal(`import "dart:typed_data";
 
-HttpRequest xhr;`);
-      expectWithTypes('var intArray: Uint8Array;').to.equal(`import "dart:typed_arrays";
-
-Uint8List intArray;`);
-      expectWithTypes('var buff: ArrayBuffer;').to.equal(`import "dart:typed_arrays";
-
-ByteBuffer buff;`);
+@JS()
+external ByteBuffer get buff;`);
     });
 
-    it('allows undeclared types', () => { expectWithTypes('var t: Thing;').to.equal('Thing t;'); });
-
-    it('does not substitute matching name from different file', () => {
-      expectWithTypes('import {Promise} from "other/file"; var y = x instanceof Promise;')
-          .to.equal(`import "package:other/file.dart" show Promise;
-
-var y = x is Promise;`);
-    });
-
-    it('does not substitute all identifiers',
-       () => { expectWithTypes('let Promise = 1;').to.equal(`var Promise = 1;`); });
-  });
-
-  describe('collection façade', () => {
-    it('translates array operations to dartisms', () => {
-      expectWithTypes('function f() { var x: Array<number> = []; x.push(1); x.pop(); }')
-          .to.equal(`f() {
-  List<num> x = [];
-  x.add(1);
-  x.removeLast();
-}`);
-      expectWithTypes('function f() { var x: Array<number> = []; x.map((e) => e); }')
-          .to.equal(`f() {
-  List<num> x = [];
-  x.map((e) => e).toList();
-}`);
-      expectWithTypes('function f() { var x: Array<number> = []; x.filter((e) => true); }')
-          .to.equal(`f() {
-  List<num> x = [];
-  x.where((e) => true).toList();
-}`);
-      expectWithTypes('function f() { var x: Array<number> = []; x.unshift(1, 2, 3); x.shift(); }')
-          .to.equal(`f() {
-  List<num> x = [];
-  (x..insertAll(0, [1, 2, 3])).length;
-  x.removeAt(0);
-}`);
-      expectWithTypes('function f() { var x: Array<number> = []; x.unshift(1); }').to.equal(`f() {
-  List<num> x = [];
-  (x..insert(0, 1)).length;
-}`);
-      expectWithTypes('function f() { var x: Array<number> = []; x.concat([1], x).length; }')
-          .to.equal(`f() {
-  List<num> x = [];
-  (new List.from(x)..addAll([1])..addAll(x)).length;
-}`);
-      expectWithTypes('var x: Array<number> = []; var y: Array<number> = x.slice(0);')
-          .to.equal(`List<num> x = [];
-List<num> y = ListWrapper.slice(x, 0);`);
-      expectWithTypes('var x: Array<number> = []; var y: Array<number> = x.splice(0,1);')
-          .to.equal(`List<num> x = [];
-List<num> y = ListWrapper.splice(x, 0, 1);`);
-      expectWithTypes('var x: Array<number> = []; var y: string = x.join("-");')
-          .to.equal(`List<num> x = [];
-String y = x.join("-");`);
-      expectWithTypes('var x: Array<number> = []; var y: string = x.join();')
-          .to.equal(`List<num> x = [];
-String y = x.join(",");`);
-      expectWithTypes('var x: Array<number> = []; var y: number = x.find((e) => e == 0);')
-          .to.equal(`List<num> x = [];
-num y = x.firstWhere((e) => e == 0, orElse: () => null);`);
-      expectWithTypes('var x: Array<number> = []; var y: boolean = x.some((e) => e == 0);')
-          .to.equal(`List<num> x = [];
-bool y = x.any((e) => e == 0);`);
-      expectWithTypes('var x: Array<number> = []; var y: number = x.reduce((a, b) => a + b, 0);')
-          .to.equal(`List<num> x = [];
-num y = x.fold(0, (a, b) => a + b);`);
-      expectWithTypes('var x: Array<number> = []; var y: number = x.reduce((a, b) => a + b);')
-          .to.equal(`List<num> x = [];
-num y = x.fold(null, (a, b) => a + b);`);
-    });
-
-    it('translates console.log', () => {
-      expectWithTypes(`console.log(1);`).to.equal('print(1);');
-      expectWithTypes(`console.log(1, 2);`).to.equal('print([1, 2].join(" "));');
-    });
-
-    it('translates string methoids',
-       () => { expectErroneousWithType(`var x = 'asd'.substr(0, 1);`).to.throw(/use substring/); });
-
-    it('translates map operations to dartisms', () => {
-      expectWithTypes('function f() { var x = new Map<string, string>(); x.set("k", "v"); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  x["k"] = "v";
-}`);
-      expectWithTypes('function f() { var x = new Map<string, string>(); x.get("k"); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  x["k"];
-}`);
-      expectWithTypes('function f() { var x = new Map<string, string>(); x.has("k"); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  x.containsKey("k");
-}`);
-      expectWithTypes('function f() { var x = new Map<string, string>(); x.delete("k"); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  (x.containsKey("k") && (x.remove("k") != null || true));
-}`);
-      expectWithTypes(
-          'function f() { var x = new Map<string, string>(); x.forEach((v, k) => null); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  x.forEach((k, v) => null);
-}`);
-      expectWithTypes(
-          'function f() { var x = new Map<string, string>(); x.forEach(function (v, k) { return null; }); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  x.forEach((k, v) {
-    return null;
-  });
-}`);
-      expectWithTypes(
-          'function f() { var x = new Map<string, string>(); var y = x.forEach((v, k) => { return null; }); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  var y = x.forEach((k, v) {
-    return null;
-  });
-}`);
-
-      expectWithTypes('function f() { var x = new Map<string, string>(); x.forEach(fn); }')
-          .to.equal(`f() {
-  var x = new Map<String, String>();
-  x.forEach((k, v) => (fn)(v, k));
-}`);
-    });
-
-    it('translates map properties to dartisms', () => {
-      expectWithTypes('var x = new Map<string, string>();var y = x.size;')
-          .to.equal(`var x = new Map<String, String>();
-var y = x.length;`);
+    it('allows undeclared types', () => {
+      expectWithTypes('const t: Thing;').to.equal(`@JS()
+external Thing get t;`);
     });
   });
 
-  describe('regexp', () => {
-    expectWithTypes('function f() { var x = /a/g; x.test("a"); }').to.equal(`f() {
-  var x = new RegExp(r'a');
-  x.hasMatch("a");
-}`);
-    expectWithTypes('function f() { var result = /a(.)/g.exec("ab")[1]; }').to.equal(`f() {
-  var result = new RegExp(r'a(.)').firstMatch("ab")[1];
-}`);
-    expectWithTypes('function f() { let groups = /a(.)/g.exec("ab"); }').to.equal(`f() {
-  var groups = ((match) => new List.generate(
-      1 + match.groupCount, match.group))(new RegExp(r'a(.)').firstMatch("ab"));
-}`);
-    expectErroneousWithType('function f() { var x = /a(.)/g; x.exec("ab")[1]; }')
-        .to.throw(
-            'exec is only supported on regexp literals, ' +
-            'to avoid side-effect of multiple calls on global regexps.');
-  });
-
-  describe('promises', () => {
-    it('translates into Futures', () => {
-      expectWithTypes('let x: Promise = Promise.resolve(1);').to.equal(`import "dart:async";
-
-Future x = Future.value(1);`);
-      expectWithTypes('let x: Promise = Promise.reject(1);').to.equal(`import "dart:async";
-
-Future x = Future.error(1);`);
-      expectWithTypes('let x: Promise = new Promise((resolve) => {resolve(1);});')
-          .to.equal(`import "dart:async";
-
-Future x = (() {
-  Completer _completer$$ts2dart$0 = new Completer();
-  var resolve = _completer$$ts2dart$0.complete;
-  (() {
-    resolve(1);
-  })();
-  return _completer$$ts2dart$0.future;
-})();`);
-      expectWithTypes('let x: Promise = new Promise((resolve, reject) => {resolve(1);});')
-          .to.equal(`import "dart:async";
-
-Future x = (() {
-  Completer _completer$$ts2dart$0 = new Completer();
-  var resolve = _completer$$ts2dart$0.complete;
-  var reject = _completer$$ts2dart$0.completeError;
-  (() {
-    resolve(1);
-  })();
-  return _completer$$ts2dart$0.future;
-})();`);
-      expectWithTypes('let x: Promise = new Promise((myParam1, myParam2) => {myParam1(1);});')
-          .to.equal(`import "dart:async";
-
-Future x = (() {
-  Completer _completer$$ts2dart$0 = new Completer();
-  var myParam1 = _completer$$ts2dart$0.complete;
-  var myParam2 = _completer$$ts2dart$0.completeError;
-  (() {
-    myParam1(1);
-  })();
-  return _completer$$ts2dart$0.future;
-})();`);
-      expectWithTypes(
-          'let x: Promise<any> = new Promise((resolve, reject) => {resolve(1);});' +
-          'function fn(): void { x.then((v) => { console.log(v) }).catch((err) => { console.log(err); }); }')
-          .to.equal(`import "dart:async";
-
-Future<dynamic> x = (() {
-  Completer _completer$$ts2dart$0 = new Completer();
-  var resolve = _completer$$ts2dart$0.complete;
-  var reject = _completer$$ts2dart$0.completeError;
-  (() {
-    resolve(1);
-  })();
-  return _completer$$ts2dart$0.future;
-})();
-void fn() {
-  x.then((v) {
-    print(v);
-  }).catchError((err) {
-    print(err);
-  });
-}`);
-      expectWithTypes(
-          'var fn: () => Promise<number>;' +
-          'function main() { fn().then((v) => { console.log(v) }).catch((err) => { console.log(err); }); }')
-          .to.equal(`import "dart:async";
-
-dynamic /* () => Promise<number> */ fn;
-main() {
-  fn().then((v) {
-    print(v);
-  }).catchError((err) {
-    print(err);
-  });
-}`);
-      expectWithTypes(
-          'var fn: () => Promise<number>;' +
-          'function main() { fn().then((v) => { console.log(v) }, (err) => { console.log(err); }); }')
-          .to.equal(`import "dart:async";
-
-dynamic /* () => Promise<number> */ fn;
-main() {
-  fn().then((v) {
-    print(v);
-  }).catchError((err) {
-    print(err);
-  });
-}`);
+  describe('skip top level calls', () => {
+    it('console.log', () => {
+      expectWithTypes(`console.log(1);`).to.equal('');
+      expectWithTypes(`console.log(1, 2);`).to.equal('');
     });
   });
 
-  describe(
-      'builtin functions', () => {
-        it('translates CONST_EXPR(...) to const (...)', () => {
-          expectWithTypes(
-              'import {CONST_EXPR} from "angular2/src/facade/lang";\n' +
-              'const x = CONST_EXPR(1);')
-              .to.equal('const x = 1;');
-          expectWithTypes(
-              'import {CONST_EXPR} from "angular2/src/facade/lang";\n' +
-              'const x = CONST_EXPR([]);')
-              .to.equal('const x = const [];');
-          expectWithTypes(
-              'import {CONST_EXPR} from "angular2/src/facade/lang";\n' +
-              'class Person {}' +
-              'const x = CONST_EXPR(new Person());')
-              .to.equal(`class Person {}
+  describe('const', () => {
+    it('simple', () => {
+      expectWithTypes('const x = 1;').to.equal(`@JS()
+external get x;`);
+      expectWithTypes('const x = [];').to.equal(`@JS()
+external get x;`);
+      expectWithTypes(
+          'class Person {}' +
+          'const x = new Person();')
+          .to.equal(`@JS()
+class Person {
+  // @Ignore
+  Person.fakeConstructor$();
+}
 
-const x = const Person();`);
-          expectWithTypes(
-              'import {CONST_EXPR} from "angular2/src/facade/lang";\n' +
-              'const x = CONST_EXPR({"one":1});')
-              .to.equal('const x = const {"one": 1};');
-          expectWithTypes(
-              'import {CONST_EXPR} from "angular2/src/facade/lang";\n' +
-              'import {Map} from "angular2/src/facade/collection";\n' +
-              'const x = CONST_EXPR(new Map());')
-              .to.equal(`import "package:angular2/src/facade/collection.dart" show Map;
-
-const x = const {};`);
-          expectWithTypes(
-              'import {CONST_EXPR} from "angular2/src/facade/lang";\n' +
-              'import {Map} from "angular2/src/facade/collection";\n' +
-              'const x = CONST_EXPR(new Map<number, string>());')
-              .to.equal(`import "package:angular2/src/facade/collection.dart" show Map;
-
-const x = const <num, String>{};`);
-
-          expectWithTypes(`
-            import {CONST_EXPR} from "angular2/src/facade/lang";
-            const _EMPTY_LIST = CONST_EXPR([]);`)
-              .to.equal(`const _EMPTY_LIST = const [];`);
-          expectWithTypes(`
-            import {CONST_EXPR} from "angular2/src/facade/lang";
-            const _EMPTY_LIST = CONST_EXPR(<string[]>[]);`)
-              .to.equal(`const _EMPTY_LIST = const <String>[];`);
-          expectWithTypes(`
-            import {CONST_EXPR} from "angular2/src/facade/lang";
-            const MY_MAP = CONST_EXPR(<{[k: string]: number}>{});`)
-              .to.equal(`const MY_MAP = const <String, num>{};`);
-        });
-
-        it('translates forwardRef(() => T) to T',
-           () => {
-             expectWithTypes(
-                 'import {forwardRef} from "angular2/src/core/di/forward_ref";\n' +
-                 'var SomeType = 1;\n' +
-                 'var x = forwardRef(() => SomeType);')
-                 .to.equal(`var SomeType = 1;
-var x = SomeType;`);
-             expectErroneousWithType(`import {forwardRef} from "angular2/src/core/di/forward_ref";
-forwardRef(1)`).to.throw(/only arrow functions/);
-           });
-
-        it('erases calls to normalizeBlank', () => {
-          expectWithTypes(
-              'import {normalizeBlank} from "angular2/src/facade/lang";\n' +
-              'var x = normalizeBlank([]);')
-              .to.equal('var x = [];');
-        });
-      });
+@JS()
+external get x;`);
+    });
+  });
 
   it('translates array façades', () => {
-    expectWithTypes('function f() { var x = []; Array.isArray(x); }').to.equal(`f() {
-  var x = [];
-  ((x) is List);
-}`);
+    expectWithTypes('function f() : string[] {}').to.equal(`@JS()
+external List<String> f();`);
   });
 
   describe('error detection', () => {
-    describe('Map', () => {
-      it('.forEach() should report an error when the callback doesn\'t have 2 args', () => {
-        expectErroneousWithType('var x = new Map<string, string>(); x.forEach((v, k, m) => null);')
-            .to.throw('Map.forEach callback requires exactly two arguments');
-      });
-    });
-
-    describe('Array', () => {
-      it('.concat() should report an error if any arg is not an Array', () => {
-        expectErroneousWithType('var x: Array<number> = []; x.concat(1);')
-            .to.throw('Array.concat only takes Array arguments');
-      });
-    });
-
-    it('for untyped symbols matching special cased fns', () => {
-      expectErroneousWithType('forwardRef(1)').to.throw(/Untyped property access to "forwardRef"/);
-    });
-
-    it('for untyped symbols matching special cased methods', () => {
-      expectErroneousWithType('x.push(1)').to.throw(/Untyped property access to "push"/);
-    });
-
-    it('allows unrelated methods', () => {
+    it('support imports', () => {
       expectWithTypes(
           'import {X} from "other/file";\n' +
-          'var y = new X().map(1)')
+          'let x:X;')
           .to.equal(`import "package:other/file.dart" show X;
 
-var y = new X().map(1);`);
-      expectWithTypes(`import {X} from "other/file";
-var y = X.get({"a": 1}, "a");`)
-          .to.equal(`import "package:other/file.dart" show X;
-
-var y = X.get({"a": 1}, "a");`);
-      expectWithTypes('["a", "b"].map((x) => x);').to.equal('["a", "b"].map((x) => x).toList();');
+@JS()
+external X get x;
+@JS()
+external set x(X v);`);
     });
   });
 });