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142 lines
6.3 KiB
Markdown
142 lines
6.3 KiB
Markdown
# `react-devtools-core`
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This package provides low-level APIs to support renderers like [React Native](https://github.com/facebook/react-native). If you're looking for the standalone React DevTools UI, **we suggest using [`react-devtools`](https://github.com/facebook/react/tree/main/packages/react-devtools) instead of using this package directly**.
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This package provides two entrypoints: labeled "backend" and "standalone" (frontend). Both APIs are described below.
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# Backend API
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Backend APIs are embedded in _development_ builds of renderers like [React Native](https://github.com/facebook/react-native) in order to connect to the React DevTools UI.
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### Example
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If you are building a non-browser-based React renderer, you can use the backend API like so:
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```js
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if (process.env.NODE_ENV !== 'production') {
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const { connectToDevTools } = require("react-devtools-core");
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// Must be called before packages like react or react-native are imported
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connectToDevTools({
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...config
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});
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}
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```
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> **NOTE** that this API (`connectToDevTools`) must be (1) run in the same context as React and (2) must be called before React packages are imported (e.g. `react`, `react-dom`, `react-native`).
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### `connectToDevTools` options
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| Prop | Default | Description |
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|---|---|---|
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| `host` | `"localhost"` | Socket connection to frontend should use this host. |
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| `isAppActive` | | (Optional) function that returns true/false, telling DevTools when it's ready to connect to React. |
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| `port` | `8097` | Socket connection to frontend should use this port. |
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| `resolveRNStyle` | | (Optional) function that accepts a key (number) and returns a style (object); used by React Native. |
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| `retryConnectionDelay` | `200` | Delay (ms) to wait between retrying a failed Websocket connection |
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| `useHttps` | `false` | Socket connection to frontend should use secure protocol (wss). |
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| `websocket` | | Custom `WebSocket` connection to frontend; overrides `host` and `port` settings. |
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### `connectWithCustomMessagingProtocol` options
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| Prop | Description |
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|-----------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `onSubscribe` | Function, which receives listener (function, with a single argument) as an argument. Called when backend subscribes to messages from the other end (frontend). |
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| `onUnsubscribe` | Function, which receives listener (function) as an argument. Called when backend unsubscribes to messages from the other end (frontend). |
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| `onMessage` | Function, which receives 2 arguments: event (string) and payload (any). Called when backend emits a message, which should be sent to the frontend. |
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Unlike `connectToDevTools`, `connectWithCustomMessagingProtocol` returns a callback, which can be used for unsubscribing the backend from the global DevTools hook.
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# Frontend API
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Frontend APIs can be used to render the DevTools UI into a DOM node. One example of this is [`react-devtools`](https://github.com/facebook/react/tree/main/packages/react-devtools) which wraps DevTools in an Electron app.
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### Example
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```js
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import DevtoolsUI from "react-devtools-core/standalone";
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// See the full list of API methods in documentation below.
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const { setContentDOMNode, startServer } = DevtoolsUI;
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// Render DevTools UI into a DOM element.
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setContentDOMNode(document.getElementById("container"));
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// Start socket server used to communicate between backend and frontend.
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startServer(
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// Port defaults to 8097
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1234,
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// Host defaults to "localhost"
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"example.devserver.com",
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// Optional config for secure socket (WSS).
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{
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key: fs.readFileSync('test/fixtures/keys/agent2-key.pem'),
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cert: fs.readFileSync('test/fixtures/keys/agent2-cert.pem')
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}
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);
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```
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### Exported methods
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The `default` export is an object defining the methods described below.
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These methods support chaining for convenience. For example:
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```js
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const DevtoolsUI = require("react-devtools-core/standalone");
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DevtoolsUI.setContentDOMNode(element).startServer();
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```
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#### `connectToSocket(socket: WebSocket)`
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> This is an advanced config function that is typically not used.
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Custom `WebSocket` connection to use for communication between DevTools frontend and backend. Calling this method automatically initializes the DevTools UI (similar to calling `startServer()`).
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#### `openProfiler()`
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Automatically select the "Profiler" tab in the DevTools UI.
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#### `setContentDOMNode(element: HTMLElement)`
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Set the DOM element DevTools UI should be rendered into on initialization.
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#### `setDisconnectedCallback(callback: Function)`
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_Optional_ callback to be notified when DevTools `WebSocket` closes (or errors).
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#### `setProjectRoots(roots: Array<string>)`
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_Optional_ set of root directories for source files. These roots can be used to open an inspected component's source code using an IDE.
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#### `setStatusListener(callback: Function)`
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_Optional_ callback to be notified of socket server events (e.g. initialized, errored, connected).
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This callback receives two parameters:
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```js
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function onStatus(
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message: string,
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status: 'server-connected' | 'devtools-connected' | 'error'
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): void {
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// ...
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}
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```
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#### `startServer(port?: number, host?: string, httpsOptions?: Object, loggerOptions?: Object)`
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Start a socket server (used to communicate between backend and frontend) and renders the DevTools UI.
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This method accepts the following parameters:
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| Name | Default | Description |
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|---|---|---|
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| `port` | `8097` | Socket connection to backend should use this port. |
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| `host` | `"localhost"` | Socket connection to backend should use this host. |
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| `httpsOptions` | | _Optional_ object defining `key` and `cert` strings. |
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| `loggerOptions` | | _Optional_ object defining a `surface` string (to be included with DevTools logging events). |
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# Development
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Watch for changes made to the backend entry point and rebuild:
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```sh
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yarn start:backend
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```
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Watch for changes made to the standalone UI entry point and rebuild:
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```sh
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yarn start:standalone
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```
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Run the standalone UI using `yarn start` in the [`react-devtools`](https://github.com/facebook/react/tree/main/packages/react-devtools).
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