added MessagePort polyfill and transform .mjs dep

Author: timea-solid

jest.config.mjs

@@ -8,10 +8,10 @@ export default {
   },
   testPathIgnorePatterns: ['/node_modules/', '/dist/'],
   transform: {
-    '^.+\\.[tj]sx?$': ['babel-jest', { configFile: './babel.config.mjs' }],
+    '^.+\\.(mjs|[tj]sx?)$': ['babel-jest', { configFile: './babel.config.mjs' }],
   },
   transformIgnorePatterns: [
-    '<rootDir>/node_modules/(?!(lit-html|@noble/curves|@noble/hashes|@exodus/bytes|uuid|jsdom|parse5)/)',
+    '<rootDir>/node_modules/(?!(lit-html|@noble/curves|@noble/hashes|@exodus/bytes|uuid|jsdom|parse5|@asamuzakjp/css-color|@csstools)/)',
   ],
   setupFilesAfterEnv: ['./test/helpers/setup.ts'],
   testMatch: ['**/?(*.)+(spec|test).[tj]s?(x)'],

test/helpers/setup.ts

@@ -19,6 +19,16 @@ global.TransformStream = TransformStream
 global.ReadableStream = ReadableStream
 global.WritableStream = WritableStream
 
+// Node provides MessagePort via worker_threads; jsdom/undici expects it in global scope
+try {
+  // eslint-disable-next-line @typescript-eslint/no-var-requires
+  const { MessageChannel, MessagePort } = require('worker_threads')
+  global.MessageChannel = MessageChannel
+  global.MessagePort = MessagePort
+} catch (err) {
+  // worker_threads not available (older Node), ignore
+}
+
 // Mock external dependencies that solid-logic expects
 jest.mock('$rdf', () => require('rdflib'), { virtual: true })