141 lines
3.8 KiB
JavaScript
141 lines
3.8 KiB
JavaScript
'use strict';
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const fs = require('fs');
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const path = require('path');
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const paths = require('./paths');
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const chalk = require('react-dev-utils/chalk');
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const resolve = require('resolve');
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/**
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* Get additional module paths based on the baseUrl of a compilerOptions object.
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*
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* @param {Object} options
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*/
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function getAdditionalModulePaths(options = {}) {
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const baseUrl = options.baseUrl;
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// We need to explicitly check for null and undefined (and not a falsy value) because
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// TypeScript treats an empty string as `.`.
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if (baseUrl == null) {
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// If there's no baseUrl set we respect NODE_PATH
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// Note that NODE_PATH is deprecated and will be removed
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// in the next major release of create-react-app.
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const nodePath = process.env.NODE_PATH || '';
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return nodePath.split(path.delimiter).filter(Boolean);
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}
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const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
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// We don't need to do anything if `baseUrl` is set to `node_modules`. This is
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// the default behavior.
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if (path.relative(paths.appNodeModules, baseUrlResolved) === '') {
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return null;
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}
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// Allow the user set the `baseUrl` to `appSrc`.
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if (path.relative(paths.appSrc, baseUrlResolved) === '') {
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return [paths.appSrc];
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}
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// If the path is equal to the root directory we ignore it here.
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// We don't want to allow importing from the root directly as source files are
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// not transpiled outside of `src`. We do allow importing them with the
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// absolute path (e.g. `src/Components/Button.js`) but we set that up with
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// an alias.
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if (path.relative(paths.appPath, baseUrlResolved) === '') {
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return null;
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}
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// Otherwise, throw an error.
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throw new Error(
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chalk.red.bold(
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"Your project's `baseUrl` can only be set to `src` or `node_modules`." +
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' Create React App does not support other values at this time.'
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)
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);
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}
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/**
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* Get webpack aliases based on the baseUrl of a compilerOptions object.
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*
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* @param {*} options
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*/
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function getWebpackAliases(options = {}) {
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const baseUrl = options.baseUrl;
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if (!baseUrl) {
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return {};
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}
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const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
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if (path.relative(paths.appPath, baseUrlResolved) === '') {
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return {
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src: paths.appSrc,
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};
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}
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}
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/**
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* Get jest aliases based on the baseUrl of a compilerOptions object.
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*
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* @param {*} options
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*/
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function getJestAliases(options = {}) {
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const baseUrl = options.baseUrl;
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if (!baseUrl) {
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return {};
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}
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const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
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if (path.relative(paths.appPath, baseUrlResolved) === '') {
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return {
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'src/(.*)$': '<rootDir>/src/$1',
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};
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}
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}
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function getModules() {
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// Check if TypeScript is setup
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const hasTsConfig = fs.existsSync(paths.appTsConfig);
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const hasJsConfig = fs.existsSync(paths.appJsConfig);
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if (hasTsConfig && hasJsConfig) {
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throw new Error(
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'You have both a tsconfig.json and a jsconfig.json. If you are using TypeScript please remove your jsconfig.json file.'
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);
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}
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let config;
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// If there's a tsconfig.json we assume it's a
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// TypeScript project and set up the config
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// based on tsconfig.json
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if (hasTsConfig) {
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const ts = require(resolve.sync('typescript', {
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basedir: paths.appNodeModules,
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}));
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config = ts.readConfigFile(paths.appTsConfig, ts.sys.readFile).config;
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// Otherwise we'll check if there is jsconfig.json
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// for non TS projects.
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} else if (hasJsConfig) {
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config = require(paths.appJsConfig);
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}
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config = config || {};
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const options = config.compilerOptions || {};
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const additionalModulePaths = getAdditionalModulePaths(options);
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return {
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additionalModulePaths: additionalModulePaths,
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webpackAliases: getWebpackAliases(options),
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jestAliases: getJestAliases(options),
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hasTsConfig,
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};
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}
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module.exports = getModules();
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