Support TypeScript mapped type 'as' clauses (#12129)

2020-10-14 13:16:22 -05:00
parent 3fd963fdc8
commit 6830c90ac9
11 changed files with 358 additions and 2 deletions
--- a/packages/babel-parser/src/plugins/typescript/index.js
+++ b/packages/babel-parser/src/plugins/typescript/index.js
@@ -620,6 +620,8 @@ export default (superClass: Class<Parser>): Class<Parser> =>

      this.expect(tt.bracketL);
      node.typeParameter = this.tsParseMappedTypeParameter();
+      node.nameType = this.eatContextual("as") ? this.tsParseType() : null;
+
      this.expect(tt.bracketR);

      if (this.match(tt.plusMin)) {
--- a/packages/babel-parser/src/types.js
+++ b/packages/babel-parser/src/types.js
@@ -1340,6 +1340,7 @@ export type TsMappedType = TsTypeBase & {
  typeParameter: TsTypeParameter,
  optional?: true | "+" | "-",
  typeAnnotation: ?TsType,
+  nameType: ?TsType,
 };

 export type TsLiteralType = TsTypeBase & {