TypeScript: reserve unknown as TSUnknownKeyword (#8755)

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;

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;

packages/babel-types/src/asserts/generated/index.js

@@ -762,6 +762,9 @@ export function assertTSIndexSignature(node: Object, opts?: Object = {}): void {
 export function assertTSAnyKeyword(node: Object, opts?: Object = {}): void {
   assert("TSAnyKeyword", node, opts);
 }
+export function assertTSUnknownKeyword(node: Object, opts?: Object = {}): void {
+  assert("TSUnknownKeyword", node, opts);
+}
 export function assertTSNumberKeyword(node: Object, opts?: Object = {}): void {
   assert("TSNumberKeyword", node, opts);
 }

packages/babel-types/src/builders/generated/index.js

@@ -698,6 +698,11 @@ export function TSAnyKeyword(...args: Array<any>): Object {
 }
 export { TSAnyKeyword as tsAnyKeyword };
 export { TSAnyKeyword as tSAnyKeyword };
+export function TSUnknownKeyword(...args: Array<any>): Object {
+  return builder("TSUnknownKeyword", ...args);
+}
+export { TSUnknownKeyword as tsUnknownKeyword };
+export { TSUnknownKeyword as tSUnknownKeyword };
 export function TSNumberKeyword(...args: Array<any>): Object {
   return builder("TSNumberKeyword", ...args);
 }

packages/babel-types/src/definitions/typescript.js

@@ -128,6 +128,7 @@ defineType("TSIndexSignature", {
 
 const tsKeywordTypes = [
   "TSAnyKeyword",
+  "TSUnknownKeyword",
   "TSNumberKeyword",
   "TSObjectKeyword",
   "TSBooleanKeyword",

packages/babel-types/src/validators/generated/index.js

@@ -2406,6 +2406,20 @@ export function isTSAnyKeyword(node: Object, opts?: Object): boolean {
 
   return false;
 }
+export function isTSUnknownKeyword(node: Object, opts?: Object): boolean {
+  if (!node) return false;
+
+  const nodeType = node.type;
+  if (nodeType === "TSUnknownKeyword") {
+    if (typeof opts === "undefined") {
+      return true;
+    } else {
+      return shallowEqual(node, opts);
+    }
+  }
+
+  return false;
+}
 export function isTSNumberKeyword(node: Object, opts?: Object): boolean {
   if (!node) return false;
 
@@ -4116,6 +4130,7 @@ export function isTSType(node: Object, opts?: Object): boolean {
   if (
     nodeType === "TSType" ||
     "TSAnyKeyword" === nodeType ||
+    "TSUnknownKeyword" === nodeType ||
     "TSNumberKeyword" === nodeType ||
     "TSObjectKeyword" === nodeType ||
     "TSBooleanKeyword" === nodeType ||