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TypeScript 4.0: Allow spread in the middle of tuples (#11753)

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This commit is contained in:
Nicolò Ribaudo
2020-06-30 01:04:39 +02:00
committed by Huáng Jùnliàng
parent d7347fb8bd
commit 5b4b3a3e4a
6 changed files with 69 additions and 15 deletions
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11
packages/babel-parser/src/plugins/typescript/index.js
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@@ -630,9 +630,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>
/* skipFirstToken */ false,
);
// Validate the elementTypes to ensure:
// No mandatory elements may follow optional elements
// If there's a rest element, it must be at the end of the tuple
// Validate the elementTypes to ensure that no mandatory elements
// follow optional elements
let seenOptionalElement = false;
node.elementTypes.forEach(elementNode => {
if (elementNode.type === "TSOptionalType") {
@@ -651,12 +650,6 @@ export default (superClass: Class<Parser>): Class<Parser> =>
const restNode: N.TsRestType = this.startNode();
this.next(); // skips ellipsis
restNode.typeAnnotation = this.tsParseType();
if (
this.match(tt.comma) &&
this.lookaheadCharCode() !== charCodes.rightSquareBracket
) {
this.raiseRestNotLast(this.state.start);
}
return this.finishNode(restNode, "TSRestType");
}