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pure-modules-test.js
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pure-modules-test.js
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/**
* @jest-environment node
*/
/* global describe beforeAll it expect */
// eslint-disable-next-line strict,lines-around-directive
'use strict';
const path = require('path');
const glob = require('glob');
const { rollup } = require('rollup');
const commonjs = require('rollup-plugin-commonjs');
const resolve = require('rollup-plugin-node-resolve');
const replace = require('rollup-plugin-replace');
const terser = require('rollup-plugin-terser');
const virtual = require('rollup-plugin-virtual');
const cwd = path.resolve(__dirname, '../es');
const files = glob.sync('**/*.js', {
cwd,
ignore: [
'bundle.js',
'index.js',
'globals/js/boot.js',
'globals/js/components.js',
'globals/js/watch.js',
'**/*.config.js',
// TODO: Make Flatpickr tree-shakable
'**/date-picker.js',
],
});
describe('ES modules', () => {
let lodashOutput;
const entry = '__entry_module__';
beforeAll(async () => {
const lodashBundle = await rollup({
input: entry,
plugins: [
virtual({
[entry]: `
import debounce from 'lodash.debounce';
/*#__PURE__*/
(function () { console.log(debounce); })();
`,
}),
commonjs({
include: 'node_modules/**',
sourceMap: false,
}),
resolve(),
terser.terser(),
],
onwarn: (warning, handle) => {
if (warning.code !== 'EMPTY_BUNDLE') handle(warning);
},
});
lodashOutput = (await lodashBundle.generate({ format: 'iife' })).output;
});
it.each(files)('%s should be tree-shakable', async relativeFilePath => {
const filepath = path.join(cwd, relativeFilePath);
const bundle = await rollup({
input: entry,
plugins: [
virtual({
[entry]: `import ${JSON.stringify(filepath)}`,
}),
commonjs({
include: ['node_modules/**', 'src/globals/js/settings.js', 'src/globals/js/feature-flags.js'],
sourceMap: false,
}),
resolve(),
replace({
'process.env.NODE_ENV': JSON.stringify('production'),
}),
terser.terser(),
],
onwarn: (warning, handle) => {
if (warning.code !== 'EMPTY_BUNDLE') handle(warning);
},
});
const { output } = await bundle.generate({ format: 'iife' });
// lo-dash seems to remain small chunk of code after tree-shaken
const code = output
.map(item => item.code)
.join('')
.trim()
.replace(
lodashOutput
.map(item => item.code)
.join('')
.trim(),
''
)
.replace('!function(){"use strict"}();', '');
expect(code).toBe('');
});
});