fix(test): polyfill web streams for undici v6 compatibility in jsdom

jest-environment-jsdom strips ReadableStream from globals, but undici v6
requires it at module load time. Add a shared polyfill that runs via
setupFiles before @inrupt/jest-jsdom-polyfills imports undici.

Author: maany

test/api/jest.api.config.js

@@ -11,6 +11,7 @@ const customJestConfig = {
   displayName: 'api',
   rootDir: '../../',
   // Add more setup options before each test is run
+  setupFiles: ['<rootDir>/test/jest.polyfills.js'],
   setupFilesAfterEnv: ['<rootDir>/test/api/jest.api.setup.ts'],
   // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
   moduleDirectories: ['node_modules', '<rootDir>/'],

test/component/jest.component.config.js

@@ -11,6 +11,7 @@ const customJestConfig = {
     displayName: 'component',
     rootDir: '../../',
     // Add more setup options before each test is run
+    setupFiles: ['<rootDir>/test/jest.polyfills.js'],
     setupFilesAfterEnv: ['<rootDir>/test/component/jest.component.setup.ts'],
     // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
     moduleDirectories: ['node_modules', '<rootDir>/'],

test/gateway/jest.gateway.config.js

@@ -11,6 +11,7 @@ const customJestConfig = {
     displayName: 'gateway',
     rootDir: '../../',
     // Add more setup options before each test is run
+    setupFiles: ['<rootDir>/test/jest.polyfills.js'],
     setupFilesAfterEnv: ['<rootDir>/test/gateway/jest.gateway.setup.ts'],
     // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
     moduleDirectories: ['node_modules', '<rootDir>/'],

test/hook/jest.hook.config.js

@@ -11,6 +11,7 @@ const customJestConfig = {
     displayName: 'hook',
     rootDir: '../../',
     // Add more setup options before each test is run
+    setupFiles: ['<rootDir>/test/jest.polyfills.js'],
     setupFilesAfterEnv: ['<rootDir>/test/hook/jest.hook.setup.ts'],
     // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
     moduleDirectories: ['node_modules', '<rootDir>/'],

test/jest.polyfills.js

@@ -0,0 +1,16 @@
+// Polyfill ReadableStream for jest-environment-jsdom + undici v6 compatibility.
+// jest-environment-jsdom strips web stream globals, but undici v6 requires
+// ReadableStream at module load time. This must run via `setupFiles` (before
+// setupFilesAfterEnv) so it executes before @inrupt/jest-jsdom-polyfills
+// imports undici.
+const { ReadableStream, TransformStream, WritableStream } = require('web-streams-polyfill');
+
+if (typeof globalThis.ReadableStream === 'undefined') {
+    globalThis.ReadableStream = ReadableStream;
+}
+if (typeof globalThis.TransformStream === 'undefined') {
+    globalThis.TransformStream = TransformStream;
+}
+if (typeof globalThis.WritableStream === 'undefined') {
+    globalThis.WritableStream = WritableStream;
+}

test/sdk/jest.sdk.config.js

@@ -11,6 +11,7 @@ const customJestConfig = {
   displayName: 'sdk',
   rootDir: '../../',
   // Add more setup options before each test is run
+  setupFiles: ['<rootDir>/test/jest.polyfills.js'],
   setupFilesAfterEnv: ['<rootDir>/test/sdk/jest.sdk.setup.ts'],
   // if using TypeScript with a baseUrl set to the root directory then you need the below for alias' to work
   moduleDirectories: ['node_modules', '<rootDir>/'],