Typescript - Tuples can include rest elements (#8805)

packages/babel-parser/src/plugins/typescript.js

@@ -511,7 +511,16 @@ export default (superClass: Class<Parser>): Class<Parser> =>
     }
 
     tsParseTupleElementType(): N.TsType {
+      // parses `...TsType[]`
+      if (this.match(tt.ellipsis)) {
+        const restNode: N.TsRestType = this.startNode();
+        this.next(); // skips ellipsis
+        restNode.typeAnnotation = this.tsParseType();
+        return this.finishNode(restNode, "TSRestType");
+      }
+
       const type = this.tsParseType();
+      // parses `TsType?`
       if (this.eat(tt.question)) {
         const optionalTypeNode: N.TsOptionalType = this.startNodeAtNode(type);
         optionalTypeNode.typeAnnotation = type;

packages/babel-parser/src/types.js

@@ -1105,6 +1105,7 @@ export type TsType =
   | TsArrayType
   | TsTupleType
   | TsOptionalType
+  | TsRestType
   | TsUnionOrIntersectionType
   | TsConditionalType
   | TsInferType
@@ -1190,6 +1191,11 @@ export type TsOptionalType = TsTypeBase & {
   typeAnnotation: TsType,
 };
 
+export type TsRestType = TsTypeBase & {
+  type: "TSRestType",
+  typeAnnotation: TsType,
+};
+
 export type TsUnionOrIntersectionType = TsUnionType | TsIntersectionType;
 
 export type TsUnionOrIntersectionTypeBase = TsTypeBase & {