unpkg/config/paths.js

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'use strict';
var path = require('path');
var fs = require('fs');
var url = require('url');
// Make sure any symlinks in the project folder are resolved:
// https://github.com/facebookincubator/create-react-app/issues/637
var appDirectory = fs.realpathSync(process.cwd());
function resolveApp(relativePath) {
return path.resolve(appDirectory, relativePath);
}
// We support resolving modules according to `NODE_PATH`.
// This lets you use absolute paths in imports inside large monorepos:
// https://github.com/facebookincubator/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
// We will export `nodePaths` as an array of absolute paths.
// It will then be used by Webpack configs.
// Jest doesnt need this because it already handles `NODE_PATH` out of the box.
// 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/facebookincubator/create-react-app/issues/1023#issuecomment-265344421
var nodePaths = (process.env.NODE_PATH || '')
.split(process.platform === 'win32' ? ';' : ':')
.filter(Boolean)
.filter(folder => !path.isAbsolute(folder))
.map(resolveApp);
var envPublicUrl = process.env.PUBLIC_URL;
function ensureSlash(path, needsSlash) {
var hasSlash = path.endsWith('/');
if (hasSlash && !needsSlash) {
return path.substr(path, path.length - 1);
} else if (!hasSlash && needsSlash) {
return path + '/';
} else {
return path;
}
}
function getPublicUrl(appPackageJson) {
return envPublicUrl || require(appPackageJson).homepage;
}
// We use `PUBLIC_URL` environment variable or "homepage" field to infer
// "public path" at which the app is served.
// Webpack needs to know it to put the right <script> hrefs into HTML even in
// single-page apps that may serve index.html for nested URLs like /todos/42.
// We can't use a relative path in HTML because we don't want to load something
// like /todos/42/static/js/bundle.7289d.js. We have to know the root.
function getServedPath(appPackageJson) {
var publicUrl = getPublicUrl(appPackageJson);
var servedUrl = envPublicUrl || (
publicUrl ? url.parse(publicUrl).pathname : '/'
);
return ensureSlash(servedUrl, true);
}
// config after eject: we're in ./config/
module.exports = {
appBuild: resolveApp('build'),
appPublic: resolveApp('public'),
appHtml: resolveApp('public/index.html'),
appIndexJs: resolveApp('client/index.js'),
appPackageJson: resolveApp('package.json'),
appSrc: resolveApp('client'),
yarnLockFile: resolveApp('yarn.lock'),
testsSetup: resolveApp('client/setupTests.js'),
appNodeModules: resolveApp('node_modules'),
nodePaths: nodePaths,
publicUrl: getPublicUrl(resolveApp('package.json')),
servedPath: getServedPath(resolveApp('package.json'))
};