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fix(runtime): add Object.hasOwn polyfill for JSC compatibility #53

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fix(runtime): add Object.hasOwn polyfill for JSC compatibility #53

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1 change: 1 addition & 0 deletions packages/runtime/src/index.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
import './polyfills.js';
import './globals.d.ts';

export { UI as ReactNativeHarness } from './ui/index.js';
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14 changes: 14 additions & 0 deletions packages/runtime/src/polyfills.ts
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@@ -0,0 +1,14 @@
/**
* Polyfills for ES2022+ features not supported by JSC (JavaScriptCore).
*
* JSC, used in React Native when Hermes is disabled, doesn't support
* Object.hasOwn (ES2022). This causes runtime errors when @vitest/expect
* v4.x initializes.
*
* This polyfill must be loaded before any code that uses Object.hasOwn.
*/

if (typeof Object.hasOwn !== 'function') {
Object.hasOwn = (obj: object, prop: PropertyKey): boolean =>
Object.prototype.hasOwnProperty.call(obj, prop);
}