react/packages/react-devtools-core

react-devtools-core

A standalone React DevTools implementation.

This is a low-level package. If you're looking for the Electron app you can run, use react-devtools package instead.

API

react-devtools-core

This is similar requiring the react-devtools package, but provides several configurable options. Unlike react-devtools, requiring react-devtools-core doesn't connect immediately but instead exports a function:

const { connectToDevTools } = require("react-devtools-core");
connectToDevTools(config);

Run connectToDevTools() in the same context as React to set up a connection to DevTools.
Be sure to run this function before importing e.g. react, react-dom, react-native.

The config object may contain:

• host: string (defaults to "localhost") - Websocket will connect to this host.
• port: number (defaults to 8097) - Websocket will connect to this port.
• useHttps: boolean (defaults to false) - Websocket should use a secure protocol (wss).
• websocket: Websocket - Custom websocket to use. Overrides host and port settings if provided.
• resolveRNStyle: (style: number) => ?Object - Used by the React Native style plug-in.
• retryConnectionDelay: number (defaults to 2000) - Milliseconds delay to wait between retrying a failed Websocket connection.
• isAppActive: () => boolean - If provided, DevTools will poll this method and wait until it returns true before connecting to React.

react-devtools-core/standalone

Renders the DevTools interface into a DOM node.

require("react-devtools-core/standalone")
  .setContentDOMNode(document.getElementById("container"))
  .setStatusListener(status => {
    // This callback is optional...
  })
  .startServer(port);

Renders DevTools interface into a DOM node over SSL using a custom host name (Default is localhost).

const host = 'dev.server.com';
const options = {
  key: fs.readFileSync('test/fixtures/keys/agent2-key.pem'),
  cert: fs.readFileSync('test/fixtures/keys/agent2-cert.pem')
};


require("react-devtools-core/standalone")
  .setContentDOMNode(document.getElementById("container"))
  .setStatusListener(status => {
    // This callback is optional...
  })
  .startServer(port, host, options);

Reference the react-devtools package for a complete integration example.

Development

Watch for changes made to the backend entry point and rebuild:

yarn start:backend

Watch for changes made to the standalone UI entry point and rebuild:

yarn start:standalone