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fix(runtime): add Object.hasOwn polyfill for Hermes compatibility #50

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fix(runtime): add Object.hasOwn polyfill for Hermes compatibility #50

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2 changes: 2 additions & 0 deletions packages/runtime/src/index.ts
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
// Polyfills must be imported first to ensure compatibility with Hermes
import './polyfills.js';
import './globals.d.ts';

export { UI as ReactNativeHarness } from './ui/index.js';
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16 changes: 16 additions & 0 deletions packages/runtime/src/polyfills.ts
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Original file line number Diff line number Diff line change
@@ -0,0 +1,16 @@
/**
* Polyfills for Hermes JavaScript engine compatibility.
*
* Hermes (React Native's default JS engine) doesn't support all ES2022+ features.
* This file provides polyfills for features used by harness dependencies.
*/

/**
* Object.hasOwn (ES2022)
* Used by @vitest/expect v4.x for property checking.
* @see https://github.com/facebook/hermes/issues/1875
*/
if (typeof Object.hasOwn !== 'function') {
Object.hasOwn = (obj: object, prop: PropertyKey): boolean =>
Object.prototype.hasOwnProperty.call(obj, prop);
}