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Package.js
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Package.js
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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
* @format
*/
'use strict';
const fs = require('fs');
const isAbsolutePath = require('absolute-path');
const path = require('path');
type PackageContent = {
name: string,
'react-native': mixed,
browser: mixed,
main: ?string,
};
class Package {
path: string;
_root: string;
_content: ?PackageContent;
constructor({file}: {file: string}) {
this.path = path.resolve(file);
this._root = path.dirname(this.path);
this._content = null;
}
/**
* The `browser` field and replacement behavior is specified in
* https://github.com/defunctzombie/package-browser-field-spec.
*/
getMain(): string {
const json = this.read();
let main;
if (typeof json['react-native'] === 'string') {
main = json['react-native'];
} else if (typeof json.browser === 'string') {
main = json.browser;
} else {
main = json.main || 'index';
}
const replacements = getReplacements(json);
if (replacements) {
const variants = [main];
if (main.slice(0, 2) === './') {
variants.push(main.slice(2));
} else {
variants.push('./' + main);
}
for (const variant of variants) {
const winner =
replacements[variant] ||
replacements[variant + '.js'] ||
replacements[variant + '.json'] ||
replacements[variant.replace(/(\.js|\.json)$/, '')];
if (winner) {
main = winner;
break;
}
}
}
/* $FlowFixMe: `getReplacements` doesn't validate the return value. */
return path.join(this._root, main);
}
invalidate() {
this._content = null;
}
redirectRequire(name: string): string | false {
const json = this.read();
const replacements = getReplacements(json);
if (!replacements) {
return name;
}
if (!isAbsolutePath(name)) {
const replacement = replacements[name];
// support exclude with "someDependency": false
return replacement === false
? false
: /* $FlowFixMe: type of replacements is not being validated */
replacement || name;
}
let relPath = './' + path.relative(this._root, name);
if (path.sep !== '/') {
relPath = relPath.replace(new RegExp('\\' + path.sep, 'g'), '/');
}
let redirect = replacements[relPath];
// false is a valid value
if (redirect == null) {
redirect = replacements[relPath + '.js'];
if (redirect == null) {
redirect = replacements[relPath + '.json'];
}
}
// support exclude with "./someFile": false
if (redirect === false) {
return false;
}
if (redirect) {
return path.join(
this._root,
/* $FlowFixMe: `getReplacements` doesn't validate the return value. */
redirect,
);
}
return name;
}
read(): PackageContent {
if (this._content == null) {
this._content = JSON.parse(fs.readFileSync(this.path, 'utf8'));
}
return this._content;
}
}
function getReplacements(pkg: PackageContent): ?{[string]: string | boolean} {
let rn = pkg['react-native'];
let browser = pkg.browser;
if (rn == null && browser == null) {
return null;
}
// If the field is a string, that doesn't mean we want to redirect the `main`
// file itself to anything else. See the spec.
if (rn == null || typeof rn === 'string') {
rn = {};
}
if (browser == null || typeof browser === 'string') {
browser = {};
}
// merge with "browser" as default,
// "react-native" as override
return {...browser, ...rn};
}
module.exports = Package;