From d4d061d5d29ab77819f4b74676b0a6b31210f568 Mon Sep 17 00:00:00 2001
From: Bogdan Savluk <savluk.bogdan@gmail.com>
Date: Mon, 18 May 2020 05:54:38 +0200
Subject: [PATCH] uncomment asserts type annotations (will require typescript
 3.7+)

---
 packages/babel-types/scripts/generators/typescript.js | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/packages/babel-types/scripts/generators/typescript.js b/packages/babel-types/scripts/generators/typescript.js
index ef460a73456e..850fac8f0643 100644
--- a/packages/babel-types/scripts/generators/typescript.js
+++ b/packages/babel-types/scripts/generators/typescript.js
@@ -127,9 +127,8 @@ for (const typeName of t.TYPES) {
 
   lines.push(
     `export function is${typeName}(node: object | null | undefined, opts?: object | null): ${result};`,
-    // TypeScript 3.7: https://github.com/microsoft/TypeScript/pull/32695 will allow assert declarations
     // eslint-disable-next-line max-len
-    `// export function assert${typeName}(node: object | null | undefined, opts?: object | null): asserts ${
+    `export function assert${typeName}(node: object | null | undefined, opts?: object | null): asserts ${
       result === "boolean" ? "node" : result
     };`
   );
@@ -137,8 +136,7 @@ for (const typeName of t.TYPES) {
 
 lines.push(
   // assert/
-  // Commented out as this declaration requires TypeScript 3.7 (what do?)
-  `// export function assertNode(obj: any): asserts obj is Node`,
+  `export function assertNode(obj: any): asserts obj is Node`,
 
   // builders/
   // eslint-disable-next-line max-len
@@ -303,9 +301,8 @@ lines.push(
   // the MemberExpression implication is incidental, but it follows from the implementation
   // eslint-disable-next-line max-len
   `export function matchesPattern(node: Node | null | undefined, match: string | ReadonlyArray<string>, allowPartial?: boolean): node is MemberExpression`,
-  // TypeScript 3.7: ": asserts n is T"
   // eslint-disable-next-line max-len
-  `export function validate<T extends Node, K extends keyof T>(n: Node | null | undefined, key: K, value: T[K]): void`,
+  `export function validate<T extends Node, K extends keyof T>(n: Node | null | undefined, key: K, value: T[K]): asserts n is T`,
   `export function validate(n: Node, key: string, value: any): void;`
 );