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relay-compiler-webpack-plugin

v9.1.0

Published

Automatically run the Relay Compiler from Webpack

Downloads

8,110

Readme

Relay Compiler Webpack Plugin

npm version Travis Build Status Github Actions Build Status

Are you running Relay Modern? Are you annoyed with constantly running the relay-compiler to generate code, especially if you're already running Webpack?

Well be annoyed no more! Simply install this plugin to automatically hook into Webpack's build process to generate these files for you.

Installation

  1. Add this to your project:
  yarn add --dev relay-compiler-webpack-plugin graphql
  # Or if you're using npm
  npm install --save-dev relay-compiler-webpack-plugin graphql
  1. Add the plugin to your Webpack configuration:
// const RelayCompilerLanguageTypescript = require('relay-compiler-language-typescript').default
const RelayCompilerWebpackPlugin = require('relay-compiler-webpack-plugin')
const path = require('path')

module.exports = {
  // ... Your existing Webpack configuration
  plugins: [
    // ...
    new RelayCompilerWebpackPlugin({
      // languagePlugin: RelayCompilerLanguageTypescript,
      schema: path.resolve(__dirname, './relative/path/to/schema.graphql'), // or schema.json
      src: path.resolve(__dirname, './relative/path/to/source/files'),
    })
  ]
  // ...
}

Note: TypeScript projects also needs to add the TypeScript language plugin as shown in the commented out lines in the above snippet.

  1. :tada:

Gotchas

If there are multiple versions of GraphQL in your dependency tree it will cause schema validation errors. To get around this, ensure you have the same graphql version as your relay-compiler version depends on. To assist this you can install dependencies as flat which ensures only one version of each dependency.

Plugin hooks

relay-compiler-webpack-plugin exposes a few tapable hooks, for plugins or tooling to use.

  • beforeWrite called before the plugin starts to compile queries
  • afterWrite(compileResult): called after writing is complete
class MyPlugin {
  apply (compiler) {
    compiler.hooks.compilation.tap('MyPlugin', async (compilation) => {
      RelayCompilerWebpackPlugin.getHooks(compilation).afterWrite.tapPromise(
        'MyPlugin', // <-- Set a meaningful name for stacktraces
        async (compileResult) => {
          if (compileResult === 'HAS_CHANGES') {
            await doSomething()
          }
        }
      )
    })
  }
}

Example Project

To see an example of its usage within a project, see relay-compiler-webpack-plugin-example.

Development

Running tests:

yarn test

Running tests with coverage:

yarn test:coverage

License

Relay Compiler Webpack Plugin may be redistributed according to the BSD 3-Clause License.