TypeScript: reserve unknown as TSUnknownKeyword

packages/babel-generator/src/generators/typescript.js

@@ -127,6 +127,9 @@ export function TSIndexSignature(node) {
 export function TSAnyKeyword() {
   this.word("any");
 }
+export function TSUnknownKeyword() {
+  this.word("unknown");
+}
 export function TSNumberKeyword() {
   this.word("number");
 }

packages/babel-generator/test/fixtures/typescript/types-keywords/input.js

@@ -1,4 +1,5 @@
 let a: any;
+let un: unknown;
 let b: boolean;
 let ne: never;
 let nul: null;

packages/babel-generator/test/fixtures/typescript/types-keywords/output.js

@@ -1,4 +1,5 @@
 let a: any;
+let un: unknown;
 let b: boolean;
 let ne: never;
 let nul: null;
@@ -7,4 +8,4 @@ let o: object;
 let st: string;
 let sy: symbol;
 let u: undefined;
-let v: void;
+let v: void;

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

@@ -57,6 +57,8 @@ function keywordTypeFromName(
       return "TSSymbolKeyword";
     case "undefined":
       return "TSUndefinedKeyword";
+    case "unknown":
+      return "TSUnknownKeyword";
     default:
       return undefined;
   }

packages/babel-parser/src/types.js

@@ -1119,6 +1119,7 @@ export type TsTypeBase = NodeBase;
 
 export type TsKeywordTypeType =
   | "TSAnyKeyword"
+  | "TSUnknownKeyword"
   | "TSNumberKeyword"
   | "TSObjectKeyword"
   | "TSBooleanKeyword"

packages/babel-parser/test/fixtures/typescript/types/keywords/input.js

@@ -1,4 +1,5 @@
 let a: any;
+let un: unknown;
 let b: boolean;
 let ne: never;
 let nul: null;