Make the fuchsia mojo/public repo the source of truth.

mojo/public/tools/bindings/generators/js_templates/interface_definition.tmpl

-{%- for method in interface.methods %}
-  var k{{interface.name}}_{{method.name}}_Name = {{method.ordinal}};
-{%- endfor %}
-
-  function {{interface.name}}Proxy(receiver) {
-    bindings.ProxyBase.call(this, receiver);
-  }
-  {{interface.name}}Proxy.prototype = Object.create(bindings.ProxyBase.prototype);
-
-{%- for method in interface.methods %}
-  {{interface.name}}Proxy.prototype.{{method.name|stylize_method}} = function(
-{%- for parameter in method.parameters -%}
-{{parameter.name}}{% if not loop.last %}, {% endif %}
-{%- endfor -%}
-) {
-    var params = new {{interface.name}}_{{method.name}}_Params();
-{%- for parameter in method.parameters %}
-    params.{{parameter.name}} = {{parameter|js_proxy_method_parameter_value}};
-{%- endfor %}
-
-{%- if method.response_parameters == None %}
-    var builder = new codec.MessageBuilder(
-        k{{interface.name}}_{{method.name}}_Name,
-        codec.align({{interface.name}}_{{method.name}}_Params.encodedSize));
-    builder.encodeStruct({{interface.name}}_{{method.name}}_Params, params);
-    var message = builder.finish();
-    this.receiver_.accept(message);
-{%- else %}
-    return new Promise(function(resolve, reject) {
-      var builder = new codec.MessageWithRequestIDBuilder(
-          k{{interface.name}}_{{method.name}}_Name,
-          codec.align({{interface.name}}_{{method.name}}_Params.encodedSize),
-          codec.kMessageExpectsResponse, 0);
-      builder.encodeStruct({{interface.name}}_{{method.name}}_Params, params);
-      var message = builder.finish();
-      this.receiver_.acceptAndExpectResponse(message).then(function(message) {
-        var reader = new codec.MessageReader(message);
-        var responseParams =
-            reader.decodeStruct({{interface.name}}_{{method.name}}_ResponseParams);
-        resolve(responseParams);
-      }).catch(function(result) {
-        reject(Error("Connection error: " + result));
-      });
-    }.bind(this));
-{%- endif %}
-  };
-{%- endfor %}
-
-  function {{interface.name}}Stub(delegate) {
-    bindings.StubBase.call(this, delegate);
-  }
-  {{interface.name}}Stub.prototype = Object.create(bindings.StubBase.prototype);
-
-{%- for method in interface.methods %}
-{%-   set js_method_name = method.name|stylize_method %}
-{%-   set delegate_expr =  "bindings.StubBindings(this).delegate" %}
-  {{interface.name}}Stub.prototype.{{js_method_name}} = function({{method.parameters|map(attribute='name')|join(', ')}}) {
-    return {{delegate_expr}} && {{delegate_expr}}.{{js_method_name}} && {{delegate_expr}}.{{js_method_name}}({{method.parameters|map('js_stub_method_parameter_value')|join(', ')}});
-  }
-{%- endfor %}
-
-  {{interface.name}}Stub.prototype.accept = function(message) {
-    var reader = new codec.MessageReader(message);
-    switch (reader.messageName) {
-{%- for method in interface.methods %}
-{%- if method.response_parameters == None %}
-    case k{{interface.name}}_{{method.name}}_Name:
-      var params = reader.decodeStruct({{interface.name}}_{{method.name}}_Params);
-      this.{{method.name|stylize_method}}(
-{%- for parameter in method.parameters -%}
-  params.{{parameter.name}}{% if not loop.last %}, {% endif %}
-{%- endfor %});
-      return true;
-{%- endif %}
-{%- endfor %}
-    default:
-      return false;
-    }
-  };
-
-  {{interface.name}}Stub.prototype.acceptWithResponder =
-      function(message, responder) {
-    var reader = new codec.MessageReader(message);
-    switch (reader.messageName) {
-{%- for method in interface.methods %}
-{%- if method.response_parameters != None %}
-    case k{{interface.name}}_{{method.name}}_Name:
-      var params = reader.decodeStruct({{interface.name}}_{{method.name}}_Params);
-      return this.{{method.name|stylize_method}}(
-{%- for parameter in method.parameters -%}
-params.{{parameter.name}}{% if not loop.last %}, {% endif -%}
-{%- endfor %}).then(function(response) {
-        var responseParams =
-            new {{interface.name}}_{{method.name}}_ResponseParams();
-{%-     for parameter in method.response_parameters %}
-        responseParams.{{parameter.name}} = response.{{parameter.name}};
-{%-     endfor %}
-        var builder = new codec.MessageWithRequestIDBuilder(
-            k{{interface.name}}_{{method.name}}_Name,
-            codec.align({{interface.name}}_{{method.name}}_ResponseParams.encodedSize),
-            codec.kMessageIsResponse, reader.requestID);
-        builder.encodeStruct({{interface.name}}_{{method.name}}_ResponseParams,
-                             responseParams);
-        var message = builder.finish();
-        responder.accept(message);
-      });
-{%- endif %}
-{%- endfor %}
-    default:
-      return Promise.reject(Error("Unhandled message: " + reader.messageName));
-    }
-  };
-
-{#--- Validation #}
-
-  function validate{{interface.name}}Request(messageValidator) {
-{%- if not(interface.methods) %}
-    return validator.validationError.NONE;
-{%- else %}
-    var message = messageValidator.message;
-    var paramsClass = null;
-    switch (message.getName()) {
-{%-   for method in interface.methods %}
-      case k{{interface.name}}_{{method.name}}_Name:
-{%-     if method.response_parameters == None %}
-        if (!message.expectsResponse() && !message.isResponse())
-          paramsClass = {{interface.name}}_{{method.name}}_Params;
-{%-     else %}
-        if (message.expectsResponse())
-          paramsClass = {{interface.name}}_{{method.name}}_Params;
-{%-     endif %}
-      break;
-{%-   endfor %}
-    }
-    if (paramsClass === null)
-      return validator.validationError.NONE;
-    return paramsClass.validate(messageValidator, messageValidator.message.getHeaderNumBytes());
-{%- endif %}
-  }
-
-  function validate{{interface.name}}Response(messageValidator) {
-{%- if not(interface|has_callbacks) %}
-    return validator.validationError.NONE;
-{%- else %}
-   var message = messageValidator.message;
-   var paramsClass = null;
-   switch (message.getName()) {
-{%-   for method in interface.methods %}
-{%-     if method.response_parameters != None %}
-      case k{{interface.name}}_{{method.name}}_Name:
-        if (message.isResponse())
-          paramsClass = {{interface.name}}_{{method.name}}_ResponseParams;
-        break;
-{%-     endif %}
-{%-   endfor %}
-    }
-    if (paramsClass === null)
-      return validator.validationError.NONE;
-    return paramsClass.validate(messageValidator, messageValidator.message.getHeaderNumBytes());
-{%- endif %}
-  }
-
-  var {{interface.name}} = {
-    name: {% if interface.service_name %}'{{interface.service_name}}'{% else %}null{% endif %},
-    proxyClass: {{interface.name}}Proxy,
-    stubClass: {{interface.name}}Stub,
-    validateRequest: validate{{interface.name}}Request,
-{%- if interface|has_callbacks %}
-    validateResponse: validate{{interface.name}}Response,
-{%- else %}
-    validateResponse: null,
-{%- endif %}
-  };
-{#--- Interface Constants #}
-{%- for constant in interface.constants %}
-  {{interface.name}}.{{constant.name}} = {{constant.value|expression_to_text}},
-{%-   endfor %}
-{#--- Interface Enums #}
-{%- from "enum_definition.tmpl" import enum_def -%}
-{%- for enum in interface.enums %}
-  {{ enum_def("%s.%s"|format(interface.name, enum.name), enum) }}
-{%-  endfor %}
-  {{interface.name}}Stub.prototype.validator = validate{{interface.name}}Request;
-{%- if interface|has_callbacks %}
-  {{interface.name}}Proxy.prototype.validator = validate{{interface.name}}Response;
-{%- else %}
-  {{interface.name}}Proxy.prototype.validator = null;
-{%- endif %}