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136 lines (112 loc) · 3.43 KB
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"use strict";
const fs = require("fs");
const path = require("path");
const paths = require("./paths");
const chalk = require("react-dev-utils/chalk");
const resolve = require("resolve");
/**
* Get additional module paths based on the baseUrl of a compilerOptions object.
*
* @param {Object} options
*/
function getAdditionalModulePaths(options = {}) {
const baseUrl = options.baseUrl;
if (!baseUrl) {
return "";
}
const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
// We don't need to do anything if `baseUrl` is set to `node_modules`. This is
// the default behavior.
if (path.relative(paths.appNodeModules, baseUrlResolved) === "") {
return null;
}
// Allow the user set the `baseUrl` to `appSrc`.
if (path.relative(paths.appSrc, baseUrlResolved) === "") {
return [paths.appSrc];
}
// If the path is equal to the root directory we ignore it here.
// We don't want to allow importing from the root directly as source files are
// not transpiled outside of `src`. We do allow importing them with the
// absolute path (e.g. `src/Components/Button.js`) but we set that up with
// an alias.
if (path.relative(paths.appPath, baseUrlResolved) === "") {
return null;
}
// Otherwise, throw an error.
throw new Error(
chalk.red.bold(
"Your project's `baseUrl` can only be set to `src` or `node_modules`." +
" Create React App does not support other values at this time.",
),
);
}
/**
* Get webpack aliases based on the baseUrl of a compilerOptions object.
*
* @param {*} options
*/
function getWebpackAliases(options = {}) {
const baseUrl = options.baseUrl;
if (!baseUrl) {
return {};
}
const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
if (path.relative(paths.appPath, baseUrlResolved) === "") {
return {
src: paths.appSrc,
};
}
}
/**
* Get jest aliases based on the baseUrl of a compilerOptions object.
*
* @param {*} options
*/
function getJestAliases(options = {}) {
const baseUrl = options.baseUrl;
if (!baseUrl) {
return {};
}
const baseUrlResolved = path.resolve(paths.appPath, baseUrl);
if (path.relative(paths.appPath, baseUrlResolved) === "") {
return {
"^src/(.*)$": "<rootDir>/src/$1",
};
}
}
function getModules() {
// Check if TypeScript is setup
const hasTsConfig = fs.existsSync(paths.appTsConfig);
const hasJsConfig = fs.existsSync(paths.appJsConfig);
if (hasTsConfig && hasJsConfig) {
throw new Error(
"You have both a tsconfig.json and a jsconfig.json. If you are using TypeScript please remove your jsconfig.json file.",
);
}
let config;
// If there's a tsconfig.json we assume it's a
// TypeScript project and set up the config
// based on tsconfig.json
if (hasTsConfig) {
const ts = require(
resolve.sync("typescript", {
basedir: paths.appNodeModules,
}),
);
config = ts.readConfigFile(paths.appTsConfig, ts.sys.readFile).config;
// Otherwise we'll check if there is jsconfig.json
// for non TS projects.
} else if (hasJsConfig) {
config = require(paths.appJsConfig);
}
config = config || {};
const options = config.compilerOptions || {};
const additionalModulePaths = getAdditionalModulePaths(options);
return {
additionalModulePaths: additionalModulePaths,
webpackAliases: getWebpackAliases(options),
jestAliases: getJestAliases(options),
hasTsConfig,
};
}
module.exports = getModules();