1 | ;
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2 |
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3 | const fs = require('fs');
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4 | const path = require('path');
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5 | const paths = require('./paths');
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6 |
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7 | // Make sure that including paths.js after env.js will read .env variables.
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8 | delete require.cache[require.resolve('./paths')];
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9 |
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10 | const NODE_ENV = process.env.NODE_ENV;
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11 | if (!NODE_ENV) {
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12 | throw new Error(
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13 | 'The NODE_ENV environment variable is required but was not specified.'
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14 | );
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15 | }
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16 |
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17 | // https://github.com/bkeepers/dotenv#what-other-env-files-can-i-use
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18 | var dotenvFiles = [
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19 | `${paths.dotenv}.${NODE_ENV}.local`,
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20 | `${paths.dotenv}.${NODE_ENV}`,
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21 | // Don't include `.env.local` for `test` environment
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22 | // since normally you expect tests to produce the same
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23 | // results for everyone
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24 | NODE_ENV !== 'test' && `${paths.dotenv}.local`,
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25 | paths.dotenv,
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26 | ].filter(Boolean);
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27 |
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28 | // Load environment variables from .env* files. Suppress warnings using silent
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29 | // if this file is missing. dotenv will never modify any environment variables
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30 | // that have already been set. Variable expansion is supported in .env files.
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31 | // https://github.com/motdotla/dotenv
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32 | // https://github.com/motdotla/dotenv-expand
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33 | dotenvFiles.forEach(dotenvFile => {
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34 | if (fs.existsSync(dotenvFile)) {
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35 | require('dotenv-expand')(
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36 | require('dotenv').config({
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37 | path: dotenvFile,
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38 | })
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39 | );
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40 | }
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41 | });
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42 |
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43 | // We support resolving modules according to `NODE_PATH`.
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44 | // This lets you use absolute paths in imports inside large monorepos:
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45 | // https://github.com/facebookincubator/create-react-app/issues/253.
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46 | // It works similar to `NODE_PATH` in Node itself:
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47 | // https://nodejs.org/api/modules.html#modules_loading_from_the_global_folders
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48 | // Note that unlike in Node, only *relative* paths from `NODE_PATH` are honored.
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49 | // Otherwise, we risk importing Node.js core modules into an app instead of Webpack shims.
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50 | // https://github.com/facebookincubator/create-react-app/issues/1023#issuecomment-265344421
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51 | // We also resolve them to make sure all tools using them work consistently.
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52 | const appDirectory = fs.realpathSync(process.cwd());
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53 | process.env.NODE_PATH = (process.env.NODE_PATH || '')
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54 | .split(path.delimiter)
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55 | .filter(folder => folder && !path.isAbsolute(folder))
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56 | .map(folder => path.resolve(appDirectory, folder))
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57 | .join(path.delimiter);
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58 |
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59 | // Grab NODE_ENV and REACT_APP_* environment variables and prepare them to be
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60 | // injected into the application via DefinePlugin in Webpack configuration.
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61 | const REACT_APP = /^REACT_APP_/i;
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62 |
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63 | function getClientEnvironment(publicUrl) {
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64 | const raw = Object.keys(process.env)
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65 | .filter(key => REACT_APP.test(key))
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66 | .reduce(
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67 | (env, key) => {
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68 | env[key] = process.env[key];
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69 | return env;
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70 | },
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71 | {
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72 | // Useful for determining whether we’re running in production mode.
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73 | // Most importantly, it switches React into the correct mode.
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74 | NODE_ENV: process.env.NODE_ENV || 'development',
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75 | // Useful for resolving the correct path to static assets in `public`.
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76 | // For example, <img src={process.env.PUBLIC_URL + '/img/logo.png'} />.
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77 | // This should only be used as an escape hatch. Normally you would put
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78 | // images into the `src` and `import` them in code to get their paths.
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79 | PUBLIC_URL: publicUrl,
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80 | }
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81 | );
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82 | // Stringify all values so we can feed into Webpack DefinePlugin
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83 | const stringified = {
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84 | 'process.env': Object.keys(raw).reduce((env, key) => {
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85 | env[key] = JSON.stringify(raw[key]);
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86 | return env;
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87 | }, {}),
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88 | };
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89 |
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90 | return { raw, stringified };
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91 | }
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92 |
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93 | module.exports = getClientEnvironment;
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