/
utils.js
262 lines (232 loc) Β· 5.67 KB
/
utils.js
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const Bundler = require('../src/Bundler');
const assert = require('assert');
const vm = require('vm');
const fs = require('../src/utils/fs');
const nodeFS = require('fs');
const path = require('path');
const WebSocket = require('ws');
const Module = require('module');
const promisify = require('../src/utils/promisify');
const rimraf = promisify(require('rimraf'));
const ncp = promisify(require('ncp'));
beforeEach(async function() {
// Test run in a single process, creating and deleting the same file(s)
// Windows needs a delay for the file handles to be released before deleting
// is possible. Without a delay, rimraf fails on `beforeEach` for `/dist`
if (process.platform === 'win32') {
await sleep(50);
}
// Unix based systems also need a delay but only half as much as windows
await sleep(50);
await rimraf(path.join(__dirname, 'dist'));
});
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
function bundler(file, opts) {
return new Bundler(
file,
Object.assign(
{
outDir: path.join(__dirname, 'dist'),
watch: false,
cache: false,
killWorkers: false,
hmr: false,
logLevel: 0,
throwErrors: true
},
opts
)
);
}
function bundle(file, opts) {
return bundler(file, opts).bundle();
}
function prepareBrowserContext(bundle, globals) {
// for testing dynamic imports
const fakeElement = {
remove() {}
};
const fakeDocument = {
createElement(tag) {
return {tag};
},
getElementsByTagName() {
return [
{
appendChild(el) {
setTimeout(function() {
if (el.tag === 'script') {
vm.runInContext(
nodeFS.readFileSync(path.join(__dirname, 'dist', el.src)),
ctx
);
}
el.onload();
}, 0);
}
}
];
},
getElementById() {
return fakeElement;
},
body: {
appendChild() {
return null;
}
}
};
var exports = {};
var ctx = Object.assign(
{
exports,
module: {exports},
document: fakeDocument,
WebSocket,
console,
location: {hostname: 'localhost'},
fetch(url) {
return Promise.resolve({
arrayBuffer() {
return Promise.resolve(
new Uint8Array(
nodeFS.readFileSync(path.join(__dirname, 'dist', url))
).buffer
);
},
text() {
return Promise.resolve(
nodeFS.readFileSync(path.join(__dirname, 'dist', url), 'utf8')
);
}
});
}
},
globals
);
ctx.window = ctx;
return ctx;
}
function prepareNodeContext(bundle, globals) {
var mod = new Module(bundle.name);
mod.paths = [path.dirname(bundle.name) + '/node_modules'];
var ctx = Object.assign(
{
module: mod,
exports: module.exports,
__filename: bundle.name,
__dirname: path.dirname(bundle.name),
require: function(path) {
return mod.require(path);
},
console,
process: process,
setTimeout: setTimeout,
setImmediate: setImmediate
},
globals
);
ctx.global = ctx;
return ctx;
}
async function run(bundle, globals, opts = {}) {
var ctx;
switch (bundle.entryAsset.options.target) {
case 'browser':
ctx = prepareBrowserContext(bundle, globals);
break;
case 'node':
ctx = prepareNodeContext(bundle, globals);
break;
case 'electron':
ctx = Object.assign(
prepareBrowserContext(bundle, globals),
prepareNodeContext(bundle, globals)
);
break;
}
vm.createContext(ctx);
vm.runInContext(await fs.readFile(bundle.name), ctx);
if (opts.require !== false) {
if (ctx.parcelRequire) {
return ctx.parcelRequire(bundle.entryAsset.id);
} else if (ctx.output) {
return ctx.output;
}
if (ctx.module) {
return ctx.module.exports;
}
}
return ctx;
}
async function assertBundleTree(bundle, tree) {
if (tree.name) {
assert.equal(
path.basename(bundle.name),
tree.name,
'bundle names mismatched'
);
}
if (tree.type) {
assert.equal(
bundle.type.toLowerCase(),
tree.type.toLowerCase(),
'bundle types mismatched'
);
}
if (tree.assets) {
assert.deepEqual(
Array.from(bundle.assets)
.map(a => a.basename)
.sort(),
tree.assets.sort()
);
}
let childBundles = Array.isArray(tree) ? tree : tree.childBundles;
if (childBundles) {
let children = Array.from(bundle.childBundles).sort(
(a, b) =>
Array.from(a.assets).sort()[0].basename <
Array.from(b.assets).sort()[0].basename
? -1
: 1
);
assert.equal(
bundle.childBundles.size,
childBundles.length,
'expected number of child bundles mismatched'
);
await Promise.all(
childBundles.map((b, i) => assertBundleTree(children[i], b))
);
}
if (/js|css/.test(bundle.type)) {
assert(await fs.exists(bundle.name), 'expected file does not exist');
}
}
function nextBundle(b) {
return new Promise(resolve => {
b.once('bundled', resolve);
});
}
function deferred() {
let resolve, reject;
let promise = new Promise((res, rej) => {
resolve = res;
reject = rej;
});
promise.resolve = resolve;
promise.reject = reject;
return promise;
}
exports.sleep = sleep;
exports.bundler = bundler;
exports.bundle = bundle;
exports.run = run;
exports.assertBundleTree = assertBundleTree;
exports.nextBundle = nextBundle;
exports.deferred = deferred;
exports.rimraf = rimraf;
exports.ncp = ncp;