perf(config): set skipLibCheck: true if not defined in tsconfig

src/__tests__/__snapshots__/ng-jest-config.spec.ts.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`NgJestConfig readTsConfig should return config including Angular compiler config with tsconfig as a string from ts-jest option 1`] = `
+exports[`NgJestConfig _resolveTsConfig should return config including Angular compiler config with tsconfig as a string from ts-jest option 1`] = `
 Object {
   "annotationsAs": "decorators",
   "declaration": false,
@@ -36,7 +36,7 @@ Object {
 }
 `;
 
-exports[`NgJestConfig readTsConfig should return config including Angular compiler config with tsconfig as an object from ts-jest option 1`] = `
+exports[`NgJestConfig _resolveTsConfig should return config including Angular compiler config with tsconfig as an object from ts-jest option 1`] = `
 Object {
   "annotationsAs": "decorators",
   "declaration": false,
@@ -60,7 +60,6 @@ Object {
   "noUnusedParameters": true,
   "outDir": "",
   "removeComments": false,
-  "resolveJsonModule": true,
   "skipLibCheck": true,
   "sourceMap": true,
   "strict": true,
@@ -73,7 +72,43 @@ Object {
 }
 `;
 
-exports[`NgJestConfig readTsConfig should return config including Angular compiler config without tsconfig defined in ts-jest option 1`] = `
+exports[`NgJestConfig _resolveTsConfig should return config including Angular compiler config with tsconfig as an object from ts-jest option 2`] = `
+Object {
+  "annotationsAs": "decorators",
+  "declaration": false,
+  "enableIvy": true,
+  "esModuleInterop": true,
+  "experimentalDecorators": true,
+  "forceConsistentCasingInFileNames": true,
+  "importHelpers": true,
+  "importsNotUsedAsValues": 2,
+  "inlineSourceMap": false,
+  "inlineSources": true,
+  "lib": Array [
+    "lib.esnext.d.ts",
+    "lib.dom.d.ts",
+  ],
+  "module": 1,
+  "noEmit": false,
+  "noFallthroughCasesInSwitch": true,
+  "noImplicitReturns": true,
+  "noUnusedLocals": true,
+  "noUnusedParameters": true,
+  "outDir": "",
+  "removeComments": false,
+  "skipLibCheck": false,
+  "sourceMap": true,
+  "strict": true,
+  "suppressOutputPathCheck": true,
+  "target": 2,
+  "types": Array [
+    "node",
+    "jest",
+  ],
+}
+`;
+
+exports[`NgJestConfig _resolveTsConfig should return config including Angular compiler config without tsconfig defined in ts-jest option 1`] = `
 Object {
   "annotationsAs": "decorators",
   "declaration": false,

src/__tests__/ng-jest-config.spec.ts

@@ -7,7 +7,7 @@ describe('NgJestConfig', () => {
   const specifiedTsCfgPath = join(__dirname, '..', '..', 'tsconfig.spec.json');
   const defaultTsCfgPath = join(__dirname, '..', '..', 'tsconfig.json');
 
-  describe('readTsConfig', () => {
+  describe('_resolveTsConfig', () => {
     test('should return config including Angular compiler config with tsconfig as a string from ts-jest option', () => {
       const ngJestConfig = new NgJestConfig({
         testMatch: [],
@@ -30,30 +30,36 @@ describe('NgJestConfig', () => {
       expect(config.options).toMatchSnapshot();
     });
 
-    test('should return config including Angular compiler config with tsconfig as an object from ts-jest option', () => {
-      const ngJestConfig = new NgJestConfig({
-        cwd: '.',
-        testMatch: [],
-        testRegex: [],
-        extensionsToTreatAsEsm: [],
-        globals: {
-          'ts-jest': {
-            tsconfig: {
-              resolveJsonModule: true,
+    test.each([
+      {},
+      {
+        skipLibCheck: false,
+      },
+    ])(
+      'should return config including Angular compiler config with tsconfig as an object from ts-jest option',
+      (tsconfig) => {
+        const ngJestConfig = new NgJestConfig({
+          cwd: '.',
+          testMatch: [],
+          testRegex: [],
+          extensionsToTreatAsEsm: [],
+          globals: {
+            'ts-jest': {
+              tsconfig,
             },
           },
-        },
-        // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      } as any);
-      const config = ngJestConfig.parsedTsConfig;
+          // eslint-disable-next-line @typescript-eslint/no-explicit-any
+        } as any);
+        const config = ngJestConfig.parsedTsConfig;
 
-      delete config.options.basePath;
-      delete config.options.baseUrl;
-      expect(config.options.configFilePath).toEqual(normalizeSeparators(defaultTsCfgPath));
-      delete config.options.configFilePath;
-      delete config.options.genDir;
-      expect(config.options).toMatchSnapshot();
-    });
+        delete config.options.basePath;
+        delete config.options.baseUrl;
+        expect(config.options.configFilePath).toEqual(normalizeSeparators(defaultTsCfgPath));
+        delete config.options.configFilePath;
+        delete config.options.genDir;
+        expect(config.options).toMatchSnapshot();
+      },
+    );
 
     test('should return config including Angular compiler config without tsconfig defined in ts-jest option', () => {
       const ngJestConfig = new NgJestConfig({

src/config/ng-jest-config.ts

@@ -49,6 +49,7 @@ export class NgJestConfig extends ConfigSet {
         // Overwrite outDir so we can find generated files next to their .ts origin in compilerHost.
         outDir: '',
         suppressOutputPathCheck: true,
+        skipLibCheck: result.options.skipLibCheck ?? true,
         // For performance, disable AOT decorator downleveling transformer for applications in the CLI.
         // The transformer is not needed for VE or Ivy in this plugin since Angular decorators are removed.
         // While the transformer would make no changes, it would still need to walk each source file AST.