diff options
author | Determinant <[email protected]> | 2019-02-06 23:36:34 -0500 |
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committer | Determinant <[email protected]> | 2019-02-06 23:36:34 -0500 |
commit | 13a2bd4f4aee6b4dec0ce799e9ba212693cbedf1 (patch) | |
tree | de455efa781bdb07101eaa3283971b057e8081a7 /config/env.js | |
parent | 96b08d7651a7ecddc15bc77ce5c453fbe4e12b12 (diff) |
eject from create-react-app
Diffstat (limited to 'config/env.js')
-rw-r--r-- | config/env.js | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/config/env.js b/config/env.js new file mode 100644 index 0000000..b0344c5 --- /dev/null +++ b/config/env.js @@ -0,0 +1,93 @@ +'use strict'; + +const fs = require('fs'); +const path = require('path'); +const paths = require('./paths'); + +// Make sure that including paths.js after env.js will read .env variables. +delete require.cache[require.resolve('./paths')]; + +const NODE_ENV = process.env.NODE_ENV; +if (!NODE_ENV) { + throw new Error( + 'The NODE_ENV environment variable is required but was not specified.' + ); +} + +// https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use +var dotenvFiles = [ + `${paths.dotenv}.${NODE_ENV}.local`, + `${paths.dotenv}.${NODE_ENV}`, + // Don't include `.env.local` for `test` environment + // since normally you expect tests to produce the same + // results for everyone + NODE_ENV !== 'test' && `${paths.dotenv}.local`, + paths.dotenv, +].filter(Boolean); + +// Load environment variables from .env* files. Suppress warnings using silent +// if this file is missing. dotenv will never modify any environment variables +// that have already been set. Variable expansion is supported in .env files. +// https://github.com/motdotla/dotenv +// https://github.com/motdotla/dotenv-expand +dotenvFiles.forEach(dotenvFile => { + if (fs.existsSync(dotenvFile)) { + require('dotenv-expand')( + require('dotenv').config({ + path: dotenvFile, + }) + ); + } +}); + +// We support resolving modules according to `NODE_PATH`. +// This lets you use absolute paths in imports inside large monorepos: +// https://github.com/facebook/create-react-app/issues/253. +// It works similar to `NODE_PATH` in Node itself: +// https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders +// Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored. +// Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims. +// https://github.com/facebook/create-react-app/issues/1023#issuecomment-265344421 +// We also resolve them to make sure all tools using them work consistently. +const appDirectory = fs.realpathSync(process.cwd()); +process.env.NODE_PATH = (process.env.NODE_PATH || '') + .split(path.delimiter) + .filter(folder => folder && !path.isAbsolute(folder)) + .map(folder => path.resolve(appDirectory, folder)) + .join(path.delimiter); + +// Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be +// injected into the application via DefinePlugin in Webpack configuration. +const REACT_APP = /^REACT_APP_/i; + +function getClientEnvironment(publicUrl) { + const raw = Object.keys(process.env) + .filter(key => REACT_APP.test(key)) + .reduce( + (env, key) => { + env[key] = process.env[key]; + return env; + }, + { + // Useful for determining whether we’re running in production mode. + // Most importantly, it switches React into the correct mode. + NODE_ENV: process.env.NODE_ENV || 'development', + // Useful for resolving the correct path to static assets in `public`. + // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />. + // This should only be used as an escape hatch. Normally you would put + // images into the `src` and `import` them in code to get their paths. + PUBLIC_URL: publicUrl, + } + ); + // Stringify all values so we can feed into Webpack DefinePlugin + const stringified = { + 'process.env': Object.keys(raw).reduce((env, key) => { + env[key] = JSON.stringify(raw[key]); + return env; + }, {}), + }; + + return { raw, stringified }; +} + +module.exports = getClientEnvironment; |