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| Current File : //proc/self/root/home/ubuntu/node-v16.18.1/test/fixtures/require-resolve.js |
'use strict';
const common = require('../common');
const assert = require('assert');
const path = require('path');
const nodeModules = path.join(__dirname, 'node_modules');
const nestedNodeModules = path.join(__dirname, 'node_modules', 'node_modules');
const nestedIndex = path.join(__dirname, 'nested-index');
// Test the default behavior.
assert.strictEqual(
require.resolve('bar'),
path.join(nodeModules, 'bar.js')
);
// Verify that existing paths are removed.
assert.throws(() => {
require.resolve('bar', { paths: [] })
}, /^Error: Cannot find module 'bar'/);
// Verify that resolution path can be overwritten.
{
// three.js cannot be loaded from this file by default.
assert.throws(() => {
require.resolve('three')
}, /^Error: Cannot find module 'three'/);
// If the nested-index directory is provided as a resolve path, 'three'
// cannot be found because nested-index is used as a starting point and not
// a searched directory.
assert.throws(() => {
require.resolve('three', { paths: [nestedIndex] })
}, /^Error: Cannot find module 'three'/);
// Resolution from nested index directory also checks node_modules.
assert.strictEqual(
require.resolve('bar', { paths: [nestedIndex] }),
path.join(nodeModules, 'bar.js')
);
}
// Verify that the default paths can be used and modified.
{
const paths = require.resolve.paths('bar');
assert.strictEqual(paths[0], nodeModules);
assert.strictEqual(
require.resolve('bar', { paths }),
path.join(nodeModules, 'bar.js')
);
paths.unshift(nestedNodeModules);
assert.strictEqual(
require.resolve('bar', { paths }),
path.join(nodeModules, 'bar.js')
);
}
// Verify that relative request paths work properly.
{
const searchIn = './' + path.relative(process.cwd(), nestedIndex);
// Search in relative paths.
assert.strictEqual(
require.resolve('./three.js', { paths: [searchIn] }),
path.join(nestedIndex, 'three.js')
);
// Search in absolute paths.
assert.strictEqual(
require.resolve('./three.js', { paths: [nestedIndex] }),
path.join(nestedIndex, 'three.js')
);
// Repeat the same tests with Windows slashes in the request path.
if (common.isWindows) {
assert.strictEqual(
require.resolve('.\\three.js', { paths: [searchIn] }),
path.join(nestedIndex, 'three.js')
);
assert.strictEqual(
require.resolve('.\\three.js', { paths: [nestedIndex] }),
path.join(nestedIndex, 'three.js')
);
}
}
// Test paths option validation
assert.throws(() => {
require.resolve('.\\three.js', { paths: 'foo' })
}, {
code: 'ERR_INVALID_ARG_VALUE',
name: 'TypeError',
});
// Verify that the default require.resolve() is used for empty options.
assert.strictEqual(
require.resolve('./printA.js', {}),
require.resolve('./printA.js')
);
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