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[TS] Create TSUnionType or TSIntersectionType when typealias has a leading operator (#12758)

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* Create `TSUnionType` or `TSIntersectionType` when typealias has a leading operator

* Apply code review suggestions

* Test `TSIntersectionType`
This commit is contained in:
Federico Ciardi
2021-02-05 20:00:27 +01:00
committed by GitHub
parent 74ed698c2e
commit eccbcca948
3 changed files with 51 additions and 12 deletions
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19
packages/babel-parser/src/plugins/typescript/index.js
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@@ -936,17 +936,16 @@ export default (superClass: Class<Parser>): Class<Parser> =>
operator: TokenType,
): N.TsType {
const node: N.TsUnionType | N.TsIntersectionType = this.startNode();
this.eat(operator);
let type = parseConstituentType();
if (this.match(operator)) {
const types = [type];
while (this.eat(operator)) {
types.push(parseConstituentType());
}
node.types = types;
type = this.finishNode(node, kind);
const hasLeadingOperator = this.eat(operator);
const types = [];
do {
types.push(parseConstituentType());
} while (this.eat(operator));
if (types.length === 1 && !hasLeadingOperator) {
return types[0];
}
return type;
node.types = types;
return this.finishNode(node, kind);
}
tsParseIntersectionTypeOrHigher(): N.TsType {