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Allow '!' only on variable declarations within variable statements

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This commit is contained in:
Anders Hejlsberg 2017-11-20 09:31:11 -08:00
parent 546663a59d
commit 272076391b
1 changed files with 9 additions and 3 deletions
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12
src/compiler/parser.ts
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@ -5252,10 +5252,15 @@ namespace ts {
return parseIdentifier();
}
function parseVariableDeclaration(): VariableDeclaration {
function parseVariableDeclarationAllowExclamation() {
return parseVariableDeclaration(/*allowExclamation*/ true);
}
function parseVariableDeclaration(allowExclamation?: boolean): VariableDeclaration {
const node = <VariableDeclaration>createNode(SyntaxKind.VariableDeclaration);
node.name = parseIdentifierOrPattern();
if (node.name.kind === SyntaxKind.Identifier && token() === SyntaxKind.ExclamationToken && !scanner.hasPrecedingLineBreak()) {
if (allowExclamation && node.name.kind === SyntaxKind.Identifier &&
token() === SyntaxKind.ExclamationToken && !scanner.hasPrecedingLineBreak()) {
node.exclamationToken = parseTokenNode();
}
node.type = parseTypeAnnotation();
@ -5299,7 +5304,8 @@ namespace ts {
const savedDisallowIn = inDisallowInContext();
setDisallowInContext(inForStatementInitializer);
node.declarations = parseDelimitedList(ParsingContext.VariableDeclarations, parseVariableDeclaration);
node.declarations = parseDelimitedList(ParsingContext.VariableDeclarations,
inForStatementInitializer ? parseVariableDeclaration : parseVariableDeclarationAllowExclamation);
setDisallowInContext(savedDisallowIn);
}