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Preact Devtools

Browser extension that allows you to inspect a Preact component hierarchy, including props and state.

Requires Preact >=10.1.0

Usage

Firstly, we need to import preact/debug somewhere to initialize the connection to the extension. Make sure that this import is the first import in your whole app.

// Must be the first import
import "preact/debug";

// Or if you just want the devtools bridge (~240B) without other
// debug code (useful for production sites)
import "preact/devtools";

Then, download the Preact Devtools extension for your browser:

• Firefox
• Chrome
• Edge

Contributing

• Use npm run dev to start a demo page
• Use npm run watch to rebuild all extensions on any code changes
• Use npm run build:firefox or npm run build:chrome to create a release build

Chrome:

1. Go to extensions page
2. Enable developer mode
3. Click "Load unpacked"
4. Select dist/chrome/ folder

Firefox:

1. Go to addons page
2. Click the settings icon
3. Select "Debug addons"
4. Click "Load temporary addon"
5. Select the manifest.json in dist/firefox/

For extension reviewers

These commands will build the extension and load it into a browser with a temporary profile. The browser will automatically navigate to preactjs.com. There you can test the extension.

Chrome:

1. Execute npm run run:chrome
2. Click on Preact tab in devtools

Firefox:

1. Exectue npm run run:firefox
2. Open devtools + click on Preact tab in devtools