Address the issue that arrow function doesn't have arguments objects
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@ -4836,6 +4836,16 @@ module ts {
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function checkIdentifier(node: Identifier): Type {
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var symbol = getResolvedSymbol(node);
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// As noted in ECMAScript 6 language spec, arrow functions never have an arguments objects.
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// Although in down-level emit of arrow function, we emit it using function expression which means that
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// arguments objects will be inner bound while emitting arrow function natively in ES6, arguments objects
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// will be bound to non-arrow function that contain this arrow function. This results in inconsistent bahaviour.
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// To avoid that we will give an error to users if they use arguments objects in arrow function so that they
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// can explicitly bound arguments objects
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if (symbol === argumentsSymbol && getContainingFunction(node).kind === SyntaxKind.ArrowFunction) {
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error(node, Diagnostics.An_argument_object_has_different_behaviour_across_Javascript_versions_Use_function_expression_or_rest_parameters_instead);
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}
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if (symbol.flags & SymbolFlags.Import) {
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var symbolLinks = getSymbolLinks(symbol);
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if (!symbolLinks.referenced) {
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@ -452,5 +452,6 @@ module ts {
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You_cannot_rename_this_element: { code: 8000, category: DiagnosticCategory.Error, key: "You cannot rename this element." },
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yield_expressions_are_not_currently_supported: { code: 9000, category: DiagnosticCategory.Error, key: "'yield' expressions are not currently supported.", isEarly: true },
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Generators_are_not_currently_supported: { code: 9001, category: DiagnosticCategory.Error, key: "Generators are not currently supported.", isEarly: true },
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An_argument_object_has_different_behaviour_across_Javascript_versions_Use_function_expression_or_rest_parameters_instead: { code: 9002, category: DiagnosticCategory.Error, key: "An argument object has different behaviour across Javascript versions. Use function expression or rest parameters instead" },
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};
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}
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@ -107,7 +107,7 @@ module Utils {
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export function memoize<T extends Function>(f: T): T {
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var cache: { [idx: string]: any } = {};
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return <any>(() => {
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return <any>(function () {
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var key = Array.prototype.join.call(arguments);
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var cachedResult = cache[key];
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if (cachedResult) {
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@ -138,7 +138,7 @@ module Playback {
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function recordReplay<T extends Function>(original: T, underlying: any) {
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function createWrapper(record: T, replay: T): T {
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return <any>(() => {
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return <any>(function () {
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if (replayLog !== undefined) {
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return replay.apply(undefined, arguments);
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} else if (recordLog !== undefined) {
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