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native-esm.test.js
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native-esm.test.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
// the point here is that it's the node core module
// eslint-disable-next-line no-restricted-imports
import {readFileSync} from 'fs';
import {createRequire} from 'module';
import {dirname, resolve} from 'path';
import {fileURLToPath} from 'url';
import {jest as jestObject} from '@jest/globals';
import staticImportedStatefulFromCjs from '../fromCjs.mjs';
import {double} from '../index';
import defaultFromCjs, {namedFunction} from '../namedExport.cjs';
// eslint-disable-next-line import/named
import {bag} from '../namespaceExport.js';
import staticImportedStateful from '../stateful.mjs';
import staticImportedStatefulWithQuery from '../stateful.mjs?query=1';
import staticImportedStatefulWithAnotherQuery from '../stateful.mjs?query=2';
test('should have correct import.meta', () => {
expect(typeof require).toBe('undefined');
expect(typeof jest).toBe('undefined');
expect(import.meta).toEqual({
url: expect.any(String),
});
expect(
import.meta.url.endsWith('/e2e/native-esm/__tests__/native-esm.test.js'),
).toBe(true);
});
test('should double stuff', () => {
expect(double(1)).toBe(2);
});
test('should support importing node core modules', () => {
const dir = dirname(fileURLToPath(import.meta.url));
const packageJsonPath = resolve(dir, '../package.json');
expect(JSON.parse(readFileSync(packageJsonPath, 'utf8'))).toEqual({
jest: {
testEnvironment: 'node',
transform: {},
},
type: 'module',
});
});
test('should support importing node core modules dynamically', async () => {
// it's important that this module has _not_ been imported at the top level
const assert = await import('assert');
expect(typeof assert.strictEqual).toBe('function');
});
test('dynamic import should work', async () => {
const {double: importedDouble} = await import('../index');
expect(importedDouble).toBe(double);
expect(importedDouble(1)).toBe(2);
});
test('import cjs', async () => {
const {default: half} = await import('../commonjs.cjs');
expect(half(4)).toBe(2);
});
test('import esm from cjs', async () => {
const {default: halfPromise} = await import('../fromEsm.cjs');
expect(await halfPromise(1)).toBe(2);
});
test('require(cjs) and import(cjs) should share caches', async () => {
const require = createRequire(import.meta.url);
const {default: importedStateful} = await import('../stateful.cjs');
const requiredStateful = require('../stateful.cjs');
expect(importedStateful()).toBe(1);
expect(importedStateful()).toBe(2);
expect(requiredStateful()).toBe(3);
expect(importedStateful()).toBe(4);
expect(requiredStateful()).toBe(5);
expect(requiredStateful()).toBe(6);
});
test('import from mjs and import(mjs) should share caches', async () => {
const {default: importedStateful} = await import('../stateful.mjs');
expect(importedStateful()).toBe(1);
expect(importedStateful()).toBe(2);
expect(staticImportedStateful()).toBe(3);
expect(importedStateful()).toBe(4);
expect(staticImportedStateful()).toBe(5);
expect(staticImportedStateful()).toBe(6);
});
test('import cjs via import statement', () => {
expect(staticImportedStatefulFromCjs(4)).toBe(2);
});
test('handle unlinked dynamic imports', async () => {
const {double: deepDouble} = await import('../dynamicImport');
expect(deepDouble).toBe(double);
expect(deepDouble(4)).toBe(8);
});
test('can import `jest` object', () => {
expect(jestObject).toBeDefined();
});
test('handle dynamic imports of the same module in parallel', async () => {
const [{double: first}, {double: second}] = await Promise.all([
import('../anotherDynamicImport.js'),
import('../anotherDynamicImport.js'),
]);
expect(first).toBe(second);
expect(first(2)).toBe(4);
});
test('varies module cache by query', () => {
expect(staticImportedStatefulWithQuery).not.toBe(
staticImportedStatefulWithAnotherQuery,
);
expect(staticImportedStatefulWithQuery()).toBe(1);
expect(staticImportedStatefulWithQuery()).toBe(2);
expect(staticImportedStatefulWithAnotherQuery()).toBe(1);
expect(staticImportedStatefulWithQuery()).toBe(3);
expect(staticImportedStatefulWithAnotherQuery()).toBe(2);
expect(staticImportedStatefulWithAnotherQuery()).toBe(3);
});
test('supports named imports from CJS', () => {
expect(namedFunction()).toBe('hello from a named CJS function!');
expect(defaultFromCjs.default()).toBe('"default" export');
expect(Object.keys(defaultFromCjs)).toEqual(['namedFunction', 'default']);
});
test('supports file urls as imports', async () => {
const dynamic = await import(new URL('../stateful.mjs', import.meta.url));
expect(dynamic.default).toBe(staticImportedStateful);
});
test('namespace export', () => {
expect(bag.double).toBe(double);
});