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jest.config.js

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+const { pathsToModuleNameMapper } = require('ts-jest');
+const { compilerOptions } = require('get-tsconfig').getTsconfig().config;
+const { resolve } = require('path');
+
+/** @type {import('ts-jest').TsJestGlobalOptions} */
+const tsJestOptions = {
+	isolatedModules: true,
+	tsconfig: {
+		...compilerOptions,
+		declaration: false,
+		sourceMap: true,
+	},
+};
+
+const isCoverageEnabled = process.env.COVERAGE_ENABLED === 'true';
+
+const esmDependencies = [
+	'pdfjs-dist',
+	'openid-client',
+	'oauth4webapi',
+	'jose',
+	'p-retry',
+	'is-network-error',
+	// Add other ESM dependencies that need to be transformed here
+];
+
+const esmDependenciesPattern = esmDependencies.join('|');
+const esmDependenciesRegex = `node_modules/(${esmDependenciesPattern})/.+\\.m?js$`;
+
+/** @type {import('jest').Config} */
+const config = {
+	verbose: true,
+	testEnvironment: 'node',
+	testRegex: '\\.(test|spec)\\.(js|ts)$',
+	testPathIgnorePatterns: ['/dist/', '/node_modules/'],
+	transform: {
+		'^.+\\.ts$': ['ts-jest', tsJestOptions],
+		[esmDependenciesRegex]: [
+			'babel-jest',
+			{
+				presets: ['@babel/preset-env'],
+				plugins: ['babel-plugin-transform-import-meta'],
+			},
+		],
+	},
+	transformIgnorePatterns: [`/node_modules/(?!${esmDependenciesPattern})/`],
+	// This resolve the path mappings from the tsconfig relative to each jest.config.js
+	moduleNameMapper: {
+		'^@n8n/utils$': resolve(__dirname, 'packages/@n8n/utils/dist/index.cjs'),
+		...(compilerOptions?.paths
+			? pathsToModuleNameMapper(compilerOptions.paths, {
+					prefix: `<rootDir>${compilerOptions.baseUrl ? `/${compilerOptions.baseUrl.replace(/^\.\//, '')}` : ''}`,
+				})
+			: {}),
+	},
+	setupFilesAfterEnv: ['jest-expect-message'],
+	collectCoverage: isCoverageEnabled,
+	coverageReporters: ['text-summary', 'lcov', 'html-spa'],
+	workerIdleMemoryLimit: '1MB',
+};
+
+if (process.env.CI === 'true') {
+	config.collectCoverageFrom = ['src/**/*.ts'];
+	config.reporters = ['default', 'jest-junit'];
+	config.coverageReporters = ['cobertura'];
+}
+
+module.exports = config;