Update: Added unit tests

src/index.spec.ts

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+import * as assert from 'assert';
+import * as lib from './index';
+
+let service: ReturnType<typeof lib.createService>;
+
+it('smoke', () => {
+    assert(lib);
+});
+
+describe('create service', () => {
+
+    before(() => {
+        const configFile = `${__dirname}/test-project/tsconfig.json`;
+        service = lib.createService({ configFile });
+        assert(service);
+    });
+
+    it('errors', () => {
+        const testFile = `${__dirname}/test-project/errors.ts`;
+        service.update({ fileName: testFile });
+        const sourceFile = service.getProgram().getSourceFile(testFile);
+        assert(sourceFile);
+        const diagnostics = service.getDiagnostics(testFile);
+        assert.equal(diagnostics.length, 2);
+        assert.equal(diagnostics[0].messageText, `Type '1' is not assignable to type 'string'.`);
+        assert.equal(diagnostics[1].messageText, `Type '"foo"' is not assignable to type 'number'.`);
+    });
+
+    it('number', () => {
+        const testFile = `${__dirname}/test-project/number.ts`;
+        service.update({ fileName: testFile });
+        const sourceFile = service.getProgram().getSourceFile(testFile);
+        assert(sourceFile);
+        const diagnostics = service.getDiagnostics(testFile);
+        assert.equal(diagnostics.length, 0);
+    });
+
+    it('built in', () => {
+        const testFile = `${__dirname}/test-project/builtin.ts`;
+        service.update({ fileName: testFile });
+        const sourceFile = service.getProgram().getSourceFile(testFile);
+        assert(sourceFile);
+        const diagnostics = service.getDiagnostics(testFile);
+        assert.equal(diagnostics.length, 0);
+    });
+
+    it('types', () => {
+        const testFile = `${__dirname}/test-project/types.ts`;
+        service.update({ fileName: testFile });
+        const sourceFile = service.getProgram().getSourceFile(testFile);
+        assert(sourceFile);
+        const diagnostics = service.getDiagnostics(testFile);
+        assert.equal(diagnostics.length, 0);
+    });
+
+    it('decorator', () => {
+        const testFile = `${__dirname}/test-project/decorator.ts`;
+        service.update({ fileName: testFile });
+        const sourceFile = service.getProgram().getSourceFile(testFile);
+        assert(sourceFile);
+        const diagnostics = service.getDiagnostics(testFile);
+        assert.equal(diagnostics.length, 0);
+    });
+
+    it('global types', () => {
+        const testFile = `${__dirname}/test-project/global-types.ts`;
+        service.update({ fileName: testFile });
+        const sourceFile = service.getProgram().getSourceFile(testFile);
+        assert(sourceFile);
+        const diagnostics = service.getDiagnostics(testFile);
+        assert.equal(diagnostics.length, 0);
+    });
+
+    it('date', () => {
+        const testFile = `${__dirname}/test-project/date.ts`;
+        service.update({ fileName: testFile });
+        const sourceFile = service.getProgram().getSourceFile(testFile);
+        assert(sourceFile);
+        const diagnostics = service.getDiagnostics(testFile);
+        assert.equal(diagnostics.length, 0);
+    });
+
+});
+
+it('create service no libs', () => {
+    const configFile = `${__dirname}/test-project/tsconfig-nolibs.json`;
+    service = lib.createService({ configFile });
+    assert(service);
+});

src/test-project/builtin.ts

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+console.log(window, Promise, Date, Function);

src/test-project/date.ts

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+console.log(Date);

src/test-project/decorator.ts

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+declare const deco: any;
+@deco() class Target {}

src/test-project/errors.ts

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+import * as number from './number';
+const a: string = 1;
+const foo: number = 'foo';

src/test-project/global-types.ts

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+typeof process.env

src/test-project/number.ts

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+export const n: number = 1;

src/test-project/tsconfig-nolibs.json

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+{
+  "compilerOptions": {
+    "moduleResolution": "node",
+    "strict": true,
+  }
+}

src/test-project/tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es5",
+    "importHelpers": true,
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "experimentalDecorators": true,
+    "strict": true,
+    "lib": ["es2017", "dom"]
+  }
+}

src/test-project/types.ts

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+import * as lib from 'mocha';