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test-esm-loader-programmatically.mjs
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test-esm-loader-programmatically.mjs
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import { spawnPromisified } from '../common/index.mjs';
import * as fixtures from '../common/fixtures.js';
import assert from 'node:assert';
import { execPath } from 'node:process';
import { describe, it } from 'node:test';
// This test ensures that the register function can register loaders
// programmatically.
const commonArgs = [
'--no-warnings',
'--input-type=module',
'--loader=data:text/javascript,',
];
const commonEvals = {
import: (module) => `await import(${JSON.stringify(module)});`,
register: (loader, parentURL = 'file:///') => `register(${JSON.stringify(loader)}, ${JSON.stringify(parentURL)});`,
dynamicImport: (module) => `await import(${JSON.stringify(`data:text/javascript,${encodeURIComponent(module)}`)});`,
staticImport: (module) => `import ${JSON.stringify(`data:text/javascript,${encodeURIComponent(module)}`)};`,
};
describe('ESM: programmatically register loaders', { concurrency: !process.env.TEST_PARALLEL }, () => {
it('works with only a dummy CLI argument', async () => {
const parentURL = fixtures.fileURL('es-module-loaders', 'loader-resolve-passthru.mjs');
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--eval',
"import { register } from 'node:module';" +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-resolve-passthru.mjs')) +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-load-passthru.mjs')) +
`register(${JSON.stringify('./loader-resolve-passthru.mjs')}, ${JSON.stringify({ parentURL })});` +
`register(${JSON.stringify('./loader-load-passthru.mjs')}, ${JSON.stringify({ parentURL })});` +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const lines = stdout.split('\n');
assert.match(lines[0], /resolve passthru/);
assert.match(lines[1], /resolve passthru/);
assert.match(lines[2], /load passthru/);
assert.match(lines[3], /load passthru/);
assert.match(lines[4], /Hello from dynamic import/);
assert.strictEqual(lines[5], '');
});
describe('registering via --import', { concurrency: !process.env.TEST_PARALLEL }, () => {
for (const moduleType of ['mjs', 'cjs']) {
it(`should programmatically register a loader from a ${moduleType.toUpperCase()} file`, async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--import', fixtures.fileURL('es-module-loaders', `register-loader.${moduleType}`).href,
'--eval', commonEvals.staticImport('console.log("entry point")'),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const [
passthruStdout,
entryPointStdout,
] = stdout.split('\n');
assert.match(passthruStdout, /resolve passthru/);
assert.match(entryPointStdout, /entry point/);
});
}
});
it('programmatically registered loaders are appended to an existing chaining', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--loader',
fixtures.fileURL('es-module-loaders', 'loader-resolve-passthru.mjs'),
'--eval',
"import { register } from 'node:module';" +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-load-passthru.mjs')) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const lines = stdout.split('\n');
assert.match(lines[0], /resolve passthru/);
assert.match(lines[1], /resolve passthru/);
assert.match(lines[2], /load passthru/);
assert.match(lines[3], /Hello from dynamic import/);
assert.strictEqual(lines[4], '');
});
it('works registering loaders across files', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--eval',
commonEvals.import(fixtures.fileURL('es-module-loaders', 'register-programmatically-loader-load.mjs')) +
commonEvals.import(fixtures.fileURL('es-module-loaders', 'register-programmatically-loader-resolve.mjs')) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const lines = stdout.split('\n');
assert.match(lines[0], /resolve passthru/);
assert.match(lines[1], /load passthru/);
assert.match(lines[2], /Hello from dynamic import/);
assert.strictEqual(lines[3], '');
});
it('works registering loaders across virtual files', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--eval',
commonEvals.import(fixtures.fileURL('es-module-loaders', 'register-programmatically-loader-load.mjs')) +
commonEvals.dynamicImport(
commonEvals.import(fixtures.fileURL('es-module-loaders', 'register-programmatically-loader-resolve.mjs')) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const lines = stdout.split('\n');
assert.match(lines[0], /resolve passthru/);
assert.match(lines[1], /load passthru/);
assert.match(lines[2], /Hello from dynamic import/);
assert.strictEqual(lines[3], '');
});
it('works registering the same loaders more them once', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--eval',
"import { register } from 'node:module';" +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-resolve-passthru.mjs')) +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-load-passthru.mjs')) +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-resolve-passthru.mjs')) +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-load-passthru.mjs')) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const lines = stdout.split('\n');
assert.match(lines[0], /resolve passthru/);
assert.match(lines[1], /resolve passthru/);
assert.match(lines[2], /load passthru/);
assert.match(lines[3], /load passthru/);
assert.match(lines[4], /Hello from dynamic import/);
assert.strictEqual(lines[5], '');
});
it('works registering loaders as package name', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--eval',
"import { register } from 'node:module';" +
commonEvals.register('resolve', fixtures.fileURL('es-module-loaders', 'package.json')) +
commonEvals.register('load', fixtures.fileURL('es-module-loaders', 'package.json')) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const lines = stdout.split('\n');
// Resolve occurs twice because it is first used to resolve the `load` loader
// _AND THEN_ the `register` module.
assert.match(lines[0], /resolve passthru/);
assert.match(lines[1], /resolve passthru/);
assert.match(lines[2], /load passthru/);
assert.match(lines[3], /Hello from dynamic import/);
assert.strictEqual(lines[4], '');
});
it('works without a CLI flag', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
'--no-warnings',
'--input-type=module',
'--eval',
"import { register } from 'node:module';" +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'loader-load-passthru.mjs')) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stderr, '');
assert.strictEqual(code, 0);
assert.strictEqual(signal, null);
const lines = stdout.split('\n');
assert.match(lines[0], /load passthru/);
assert.match(lines[1], /Hello from dynamic import/);
assert.strictEqual(lines[2], '');
});
it('does not work with a loader specifier that does not exist', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--eval',
"import { register } from 'node:module';" +
commonEvals.register('./not-found.mjs', import.meta.url) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stdout, '');
assert.strictEqual(code, 1);
assert.strictEqual(signal, null);
assert.match(stderr, /ERR_MODULE_NOT_FOUND/);
});
it('does not work with a loader that got syntax errors', async () => {
const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
...commonArgs,
'--eval',
"import { register } from 'node:module';" +
commonEvals.register(fixtures.fileURL('es-module-loaders', 'syntax-error.mjs')) +
commonEvals.dynamicImport('console.log("Hello from dynamic import");'),
]);
assert.strictEqual(stdout, '');
assert.strictEqual(code, 1);
assert.strictEqual(signal, null);
assert.match(stderr, /SyntaxError/);
});
});