# NativeMessagingMutation

[**@openpolyfill/firefox-addon-playwright-harness**](/docs/api/reference)

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[@openpolyfill/firefox-addon-playwright-harness](/docs/api/reference/globals) / NativeMessagingMutation

# Type Alias: NativeMessagingMutation

> **NativeMessagingMutation** = `Uint8Array` \| `void`

Defined in: [src/native-messaging-observer.ts:45](https://github.com/OpenPolyfill/FirefoxAddonPlaywrightHarness/blob/9532a852e3623332cfb2eacd964ebdb4045220e5/src/native-messaging-observer.ts#L45)