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Check that token is AsyncKeyword before calling lookAhead (#8477)

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* Check that token is AsyncKeyword before calling lookAhead

* Fix linting errors
This commit is contained in:
Yui 2016-05-05 14:18:12 -07:00
parent 166f95c677
commit 990f1c7c37
1 changed files with 8 additions and 5 deletions
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13
src/compiler/parser.ts
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@ -2989,11 +2989,14 @@ namespace ts {
}
function tryParseAsyncSimpleArrowFunctionExpression(): ArrowFunction {
const isUnParenthesizedAsyncArrowFunction = lookAhead(isUnParenthesizedAsyncArrowFunctionWorker);
if (isUnParenthesizedAsyncArrowFunction === Tristate.True) {
const asyncModifier = parseModifiersForArrowFunction();
const expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
return parseSimpleArrowFunctionExpression(<Identifier>expr, asyncModifier);
// We do a check here so that we won't be doing unnecessarily call to "lookAhead"
if (token === SyntaxKind.AsyncKeyword) {
const isUnParenthesizedAsyncArrowFunction = lookAhead(isUnParenthesizedAsyncArrowFunctionWorker);
if (isUnParenthesizedAsyncArrowFunction === Tristate.True) {
const asyncModifier = parseModifiersForArrowFunction();
const expr = parseBinaryExpressionOrHigher(/*precedence*/ 0);
return parseSimpleArrowFunctionExpression(<Identifier>expr, asyncModifier);
}
}
return undefined;
}