als-require/tests/node-modules.test.js

A utility for using CommonJS require in the browser and creating bundles.

const assert = require('assert');
const { describe, it, beforeEach } = require('node:test');
const getNodeModules = require('../lib/node-modules');

describe('getNodeModules', () => {
   let logs = [];
   const logger = { warn: (msg) => logs.push(msg) };

   beforeEach(() => logs = []);

   it('should return correct path for als-called-from library', () => {
      const result = getNodeModules('als-called-from', logger);
      assert.ok(result.endsWith('/node_modules/als-called-from/index.js'), 'Path should point to als-called-from main file');
      assert.deepStrictEqual(logs, [], 'No warnings should be logged for a valid module');
   });

   it('should log a warning and return false for standard Node.js module', () => {
      const result = getNodeModules('fs', logger);
      assert.strictEqual(result, false, 'Should return false for standard Node.js module');
      assert.deepStrictEqual(
         logs,
         ['The module "fs" can\'t be imported and will be replaced with {}'],
         'Warning should be logged for standard Node.js module'
      );
   });

   it('should log a warning and return false for non-existent module', () => {
      const result = getNodeModules('non-existent-module', logger);
      assert.strictEqual(result, false, 'Should return false for non-existent module');
      assert.deepStrictEqual(
         logs,
         ['The module "non-existent-module" can\'t be imported and will be replaced with {}'],
         'Warning should be logged for non-existent module'
      );
   });

   it('should return correct path for als-called-from/test.js', () => {
      const result = getNodeModules('als-called-from/test.js', logger);
      assert.ok(
         result.endsWith('/node_modules/als-called-from/test.js'),
         'Path should point to als-called-from/test.js file'
      );
      assert.deepStrictEqual(logs, [], 'No warnings should be logged for a valid file within a module');
   });
});