refactor(resolver): use ts types from jest-resolve (#1439)

jest.config.js

@@ -11,7 +11,6 @@ module.exports = {
   },
   testEnvironment: 'jsdom',
   modulePathIgnorePatterns: ['examples/.*', 'website/.*'],
-  resolver: '<rootDir>/build/resolvers/ng-jest-resolver',
   snapshotSerializers: [require.resolve('jest-snapshot-serializer-raw')],
   testPathIgnorePatterns: ['/node_modules/', '/examples/', '/e2e/.*/__tests__', '\\.snap$'],
   transform: {

src/resolvers/ng-jest-resolver.spec.ts

@@ -1,3 +1,5 @@
+import type { ResolverOptions } from 'jest-resolve';
+
 import ngJestResolver from './ng-jest-resolver';
 
 test.each([
@@ -9,7 +11,7 @@ test.each([
 
   ngJestResolver('foo', {
     defaultResolver: mockedDefaultResolver,
-  });
+  } as unknown as ResolverOptions);
 
   expect(mockedDefaultResolver).toHaveBeenCalled();
   expect(mockedDefaultResolver.mock.calls[0][0]).toEqual('foo');

src/resolvers/ng-jest-resolver.ts

@@ -1,14 +1,15 @@
-const ngJestResolver = (
-  path: string,
-  // `jest-resolve` didn't expose `ResolverOptions` type
-  options: { defaultResolver: (path: string, options: Record<string, unknown>) => string },
-): string =>
-  options.defaultResolver(path, {
+import type { SyncResolver } from 'jest-resolve';
+
+const ngJestResolver: SyncResolver = (path, options) => {
+  return options.defaultResolver(path, {
     ...options,
-    packageFilter: (pkg: Record<string, unknown>) => ({
-      ...pkg,
-      main: pkg.main || pkg.es2015 || pkg.module,
-    }),
+    packageFilter(pkg) {
+      return {
+        ...pkg,
+        main: pkg.main || pkg.es2015 || pkg.module,
+      };
+    },
   });
+};
 
 export = ngJestResolver;