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fix(43879): forbid async in the left hand in a for-of statement (#43886)

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Oleksandr T
2021-05-12 16:11:08 +03:00
committed by GitHub
parent 463c79440f
commit 7aacd6b274
19 changed files with 156 additions and 0 deletions
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6
src/compiler/checker.ts
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@@ -41471,6 +41471,12 @@ namespace ts {
}
}
if (isForOfStatement(forInOrOfStatement) && !(forInOrOfStatement.flags & NodeFlags.AwaitContext) &&
isIdentifier(forInOrOfStatement.initializer) && forInOrOfStatement.initializer.escapedText === "async") {
grammarErrorOnNode(forInOrOfStatement.initializer, Diagnostics.The_left_hand_side_of_a_for_of_statement_may_not_be_async);
return false;
}
if (forInOrOfStatement.initializer.kind === SyntaxKind.VariableDeclarationList) {
const variableList = <VariableDeclarationList>forInOrOfStatement.initializer;
if (!checkGrammarVariableDeclarationList(variableList)) {

4
src/compiler/diagnosticMessages.json
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@@ -319,6 +319,10 @@
"category": "Error",
"code": 1105
},
"The left-hand side of a 'for...of' statement may not be 'async'.": {
"category": "Error",
"code": 1106
},
"Jump target cannot cross function boundary.": {
"category": "Error",
"code": 1107