Typescript function destructured params (#9431)

* fix typescript funtion destructured params for array

* update type name

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

@@ -342,17 +342,18 @@ export default (superClass: Class<Parser>): Class<Parser> =>
     }
 
     tsParseBindingListForSignature(): $ReadOnlyArray<
-      N.Identifier | N.RestElement | N.ObjectPattern,
+      N.Identifier | N.RestElement | N.ObjectPattern | N.ArrayPattern,
     > {
       return this.parseBindingList(tt.parenR).map(pattern => {
         if (
           pattern.type !== "Identifier" &&
           pattern.type !== "RestElement" &&
-          pattern.type !== "ObjectPattern"
+          pattern.type !== "ObjectPattern" &&
+          pattern.type !== "ArrayPattern"
         ) {
           throw this.unexpected(
             pattern.start,
-            `Name in a signature must be an Identifier or ObjectPattern, instead got ${
+            `Name in a signature must be an Identifier, ObjectPattern or ArrayPattern, instead got ${
               pattern.type
             }`,
           );
@@ -794,6 +795,21 @@ export default (superClass: Class<Parser>): Class<Parser> =>
         return true;
       }
 
+      if (this.match(tt.bracketL)) {
+        let braceStackCounter = 1;
+        this.next();
+
+        while (braceStackCounter > 0) {
+          if (this.match(tt.bracketL)) {
+            ++braceStackCounter;
+          } else if (this.match(tt.bracketR)) {
+            --braceStackCounter;
+          }
+          this.next();
+        }
+        return true;
+      }
+
       return false;
     }
 

packages/babel-parser/src/types.js

@@ -1076,7 +1076,9 @@ export type TsSignatureDeclaration =
 
 export type TsSignatureDeclarationOrIndexSignatureBase = NodeBase & {
   // Not using TypeScript's "ParameterDeclaration" here, since it's inconsistent with regular functions.
-  parameters: $ReadOnlyArray<Identifier | RestElement | ObjectPattern>,
+  parameters: $ReadOnlyArray<
+    Identifier | RestElement | ObjectPattern | ArrayPattern,
+  >,
   typeAnnotation: ?TsTypeAnnotation,
 };