fix: JSON.parse accepting null

src/entrypoints/json-parse.d.ts

@@ -1,12 +1,20 @@
 interface JSON {
   /**
    * Converts a JavaScript Object Notation (JSON) string into an object.
-   * @param text A valid JSON string.
+   * @param value A valid JSON string or null.
    * @param reviver A function that transforms the results. This function is called for each member of the object.
    * If a member contains nested objects, the nested objects are transformed before the parent object is.
    */
   parse(
-    text: string,
+    value: string,
+    reviver?: (this: any, key: string, value: any) => any,
+  ): unknown;
+  parse(
+    value: null,
+    reviver?: (this: any, key: string, value: any) => any,
+  ): null;
+  parse(
+    value: string | null,
     reviver?: (this: any, key: string, value: any) => any,
   ): unknown;
 }

src/tests/json-parse.ts

@@ -12,3 +12,16 @@ doNotExecute(() => {
   // @ts-expect-error
   const result = JSON.parse<string>("{}");
 });
+
+doNotExecute(() => {
+  const result = JSON.parse(null);
+
+  type tests = [Expect<Equal<typeof result, null>>];
+});
+
+doNotExecute(() => {
+  const func = (): string | null => null;
+  const result = JSON.parse(func());
+
+  type tests = [Expect<Equal<typeof result, unknown>>];
+});