feat(webpack): default tsconfig.json if not found

packages/webpack5/scripts/jest.utils.ts

@@ -0,0 +1,41 @@
+let mockedPaths = new Set([]);
+
+export let fsExistsSyncSpy: jest.SpiedFunction<any>;
+
+export function mockExistsSync() {
+	const fs = require('fs');
+	const original = fs.existsSync;
+	fsExistsSyncSpy = jest.spyOn(fs, 'existsSync');
+
+	fsExistsSyncSpy.mockImplementation((path) => {
+		if (mockedPaths.has(path)) {
+			return true;
+		}
+
+		return original.call(fs, path);
+	});
+}
+
+export function restoreExistsSync() {
+	if (fsExistsSyncSpy) {
+		fsExistsSyncSpy.mockRestore();
+	}
+}
+
+export function setHasTSConfig(value: boolean = true) {
+	if (value) {
+		mockedPaths.add('__jest__/tsconfig.json');
+
+		return;
+	}
+
+	mockedPaths.delete('__jest__/tsconfig.json');
+}
+
+export function addMockFile(path: string) {
+	mockedPaths.add(path);
+
+	return () => {
+		mockedPaths.delete(path);
+	};
+}