Catch missing imports - fixes #24

source/lib/config.ts

@@ -39,7 +39,8 @@ export default (pkg: {tsd?: RawConfig}, cwd: string): Config => {
 			target: ScriptTarget.ES2017,
 			...tsConfigCompilerOptions,
 			...packageJsonCompilerOptions,
-			moduleResolution: ModuleResolutionKind.NodeJs
+			moduleResolution: ModuleResolutionKind.NodeJs,
+			skipLibCheck: false
 		}
 	};
 };

source/test/fixtures/missing-import/index.d.ts

@@ -0,0 +1,4 @@
+export type LiteralUnion<
+	LiteralType extends BaseType,
+	BaseType extends Primitive
+> = LiteralType | (BaseType & {_?: never});

source/test/fixtures/missing-import/index.js

@@ -0,0 +1 @@
+// Nothing here

source/test/fixtures/missing-import/index.test-d.ts

@@ -0,0 +1,8 @@
+import {expectType} from '../../..';
+import {LiteralUnion} from '.';
+
+type Pet = LiteralUnion<'dog' | 'cat', string>;
+
+expectType<Pet>('dog');
+expectType<Pet>('cat');
+expectType<Pet>('unicorn');

source/test/fixtures/missing-import/package.json

@@ -0,0 +1,3 @@
+{
+	"name": "foo"
+}

source/test/test.ts

@@ -233,3 +233,14 @@ test('expectError for values', async t => {
 	t.true(diagnostics[0].message === 'Expected an error, but found none.');
 	t.true(diagnostics[0].severity === 'error');
 });
+
+test('missing import', async t => {
+	const diagnostics = await m({cwd: path.join(__dirname, 'fixtures/missing-import')});
+
+	t.true(diagnostics.length === 1);
+
+	t.true(diagnostics[0].column === 18);
+	t.true(diagnostics[0].line === 3);
+	t.true(diagnostics[0].message === 'Cannot find name \'Primitive\'.');
+	t.true(diagnostics[0].severity === 'error');
+});