refactor esm packages

Signed-off-by: Adam Setch <adam.setch@outlook.com>

Author: setchy

jest.config.ts

@@ -1,5 +1,28 @@
 import type { Config } from 'jest';
 
+const esmPackages = [
+  '@primer/react',
+  '@primer/primitives',
+  '@primer/octicons-react',
+  '@lit-labs/react',
+  'lit',
+  '@github/relative-time-element',
+  '@github/tab-container-element',
+  '@octokit/oauth-methods',
+  '@octokit/oauth-authorization-url',
+  '@octokit/request',
+  '@octokit/request-error',
+  '@octokit/endpoint',
+  '@octokit/core',
+  '@octokit/plugin-paginate-rest',
+  '@octokit/plugin-rest-endpoint-methods',
+  'universal-user-agent',
+];
+
+const escapeForRegExp = (s: string) => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+
+const transformIgnorePattern = `node_modules/(?!(?:${esmPackages.map(escapeForRegExp).join('|')})/)`;
+
 const config: Config = {
   preset: 'ts-jest',
   globalSetup: '<rootDir>/src/renderer/__helpers__/jest.setup.env.ts',
@@ -13,12 +36,8 @@ const config: Config = {
     '^.+\\.(js|mjs)$': 'babel-jest',
   },
   // Allow transforming specific ESM packages in node_modules that ship untranspiled ESM.
-  // @primer/* libraries rely on lit and @lit-labs/react internally for some components.
-  // @octokit/* libraries rely on universal-user-agent internally.
-  // We also include GitHub web components that ship ESM-only builds.
-  transformIgnorePatterns: [
-    'node_modules/(?!(?:@primer/react|@primer/primitives|@primer/octicons-react|@lit-labs/react|lit|@github/relative-time-element|@github/tab-container-element|@octokit/oauth-methods|@octokit/oauth-authorization-url|@octokit/request|@octokit/request-error|@octokit/endpoint|@octokit/core|@octokit/plugin-paginate-rest|@octokit/plugin-rest-endpoint-methods|universal-user-agent)/)',
-  ],
+  // Packages are listed above in `esmPackages` for easier maintenance.
+  transformIgnorePatterns: [transformIgnorePattern],
   moduleNameMapper: {
     // GitHub Primer Design System - CSS in JS
     '\\.css$': 'identity-obj-proxy',