feat: implement write-dts mode

README.md

@@ -157,7 +157,7 @@ Options for the TypeScript checker (`typescript` option object).
 | `configOverwrite`    | `object`  | `{ compilerOptions: { skipLibCheck: true, sourceMap: false, inlineSourceMap: false, declarationMap: false } }` | This configuration will overwrite configuration from the `tsconfig.json` file. Supported fields are: `extends`, `compilerOptions`, `include`, `exclude`, `files`, and `references`. |
 | `context`            | `string`  | `dirname(configuration.configFile)`                                                                            | The base path for finding files specified in the `tsconfig.json`. Same as the `context` option from the [ts-loader](https://github.com/TypeStrong/ts-loader#context). Useful if you want to keep your `tsconfig.json` in an external package. Keep in mind that **not** having a `tsconfig.json` in your project root can cause different behaviour between `fork-ts-checker-webpack-plugin` and `tsc`. When using editors like `VS Code` it is advised to add a `tsconfig.json` file to the root of the project and extend the config file referenced in option `configFile`.  |
 | `build`              | `boolean` | `false`                                                                                                        | The equivalent of the `--build` flag for the `tsc` command. |
-| `mode`               | `'readonly'` or `'write-tsbuildinfo'` or `'write-references'` | `'write-tsbuildinfo'`                                      | If you use the `babel-loader`, it's recommended to use `write-references` mode to improve initial compilation time. If you use `ts-loader`, it's recommended to use `write-tsbuildinfo` mode to not overwrite files emitted by the `ts-loader`. |
+| `mode`               | `'readonly'` or `'write-tsbuildinfo'` or `'write-dts'` or `'write-references'` | `'write-tsbuildinfo'`                                      | If you use the `babel-loader`, it's recommended to use `write-references` mode to improve initial compilation time. If you use `ts-loader`, it's recommended to use `write-tsbuildinfo` mode to not overwrite files emitted by the `ts-loader`. If you use `ts-loader` with `transpileOnly` flag set to `true`, use `'write-dts` to emit the type definition files. |
 | `diagnosticOptions` | `object`  | `{ syntactic: false, semantic: true, declaration: false, global: false }`                                      | Settings to select which diagnostics do we want to perform. |
 | `extensions`         | `object`  | `{}`                                                                                                           | See [TypeScript extensions options](#typescript-extensions-options). |
 | `profile`            | `boolean` | `false`                                                                                                        | Measures and prints timings related to the TypeScript performance. |

src/ForkTsCheckerWebpackPluginOptions.json

@@ -138,8 +138,8 @@
             },
             "mode": {
               "type": "string",
-              "enum": ["readonly", "write-tsbuildinfo", "write-references"],
-              "description": "`readonly` keeps all emitted files in memory, `write-tsbuildinfo` which writes only .tsbuildinfo files and `write-references` which writes both .tsbuildinfo and referenced projects output"
+              "enum": ["readonly", "write-tsbuildinfo", "write-dts", "write-references"],
+              "description": "`readonly` keeps all emitted files in memory, `write-tsbuildinfo` which writes only .tsbuildinfo files, `write-dts` writes .tsbuildinfo and type definition files, and `write-references` which writes both .tsbuildinfo and referenced projects output"
             },
             "compilerOptions": {
               "type": "object",

src/typescript-reporter/TypeScriptReporterConfiguration.ts

@@ -16,7 +16,7 @@ interface TypeScriptReporterConfiguration {
   configOverwrite: TypeScriptConfigurationOverwrite;
   build: boolean;
   context: string;
-  mode: 'readonly' | 'write-tsbuildinfo' | 'write-references';
+  mode: 'readonly' | 'write-tsbuildinfo' | 'write-dts' | 'write-references';
   diagnosticOptions: TypeScriptDiagnosticsOptions;
   extensions: {
     vue: TypeScriptVueExtensionConfiguration;

src/typescript-reporter/TypeScriptReporterOptions.ts

@@ -11,7 +11,7 @@ type TypeScriptReporterOptions =
       configOverwrite?: TypeScriptConfigurationOverwrite;
       context?: string;
       build?: boolean;
-      mode?: 'readonly' | 'write-tsbuildinfo' | 'write-references';
+      mode?: 'readonly' | 'write-tsbuildinfo' | 'write-dts' | 'write-references';
       diagnosticOptions?: Partial<TypeScriptDiagnosticsOptions>;
       extensions?: {
         vue?: TypeScriptVueExtensionOptions;

src/typescript-reporter/reporter/ControlledTypeScriptSystem.ts

@@ -39,7 +39,7 @@ interface ControlledTypeScriptSystem extends ts.System {
   setArtifacts(artifacts: FilesMatch): void;
 }
 
-type FileSystemMode = 'readonly' | 'write-tsbuildinfo' | 'write-references';
+type FileSystemMode = 'readonly' | 'write-tsbuildinfo' | 'write-dts' | 'write-references';
 
 function createControlledTypeScriptSystem(
   typescript: typeof ts,
@@ -171,7 +171,9 @@ function createControlledTypeScriptSystem(
   function getWriteFileSystem(path: string) {
     if (
       mode === 'write-references' ||
-      (mode === 'write-tsbuildinfo' && path.endsWith('.tsbuildinfo'))
+      (mode === 'write-tsbuildinfo' && path.endsWith('.tsbuildinfo')) ||
+      (mode === 'write-dts' &&
+        ['.tsbuildinfo', '.d.ts', '.d.ts.map'].some((prefix) => path.endsWith(prefix)))
     ) {
       return realFileSystem;
     }

test/e2e/TypeScriptSolutionBuilderApi.spec.ts

@@ -26,6 +26,7 @@ describe('TypeScript SolutionBuilder API', () => {
   it.each([
     { async: false, typescript: '~3.6.0', mode: 'readonly' },
     { async: true, typescript: '~3.8.0', mode: 'write-tsbuildinfo' },
+    { async: true, typescript: '~3.8.0', mode: 'write-dts' },
     { async: false, typescript: '~3.8.0', mode: 'write-references' },
   ])('reports semantic error for %p', async ({ async, typescript, mode }) => {
     await sandbox.load([
@@ -143,6 +144,25 @@ describe('TypeScript SolutionBuilder API', () => {
         await sandbox.remove('packages/client/lib');
         break;
 
+      case 'write-dts':
+        expect(await sandbox.exists('packages/shared/lib/tsconfig.tsbuildinfo')).toEqual(true);
+        expect(await sandbox.exists('packages/client/lib/tsconfig.tsbuildinfo')).toEqual(true);
+        expect(await sandbox.exists('packages/shared/lib')).toEqual(true);
+        expect(await sandbox.exists('packages/client/lib')).toEqual(true);
+        expect(await sandbox.exists('packages/shared/lib/index.d.ts')).toEqual(true);
+        expect(await sandbox.exists('packages/shared/lib/index.d.ts.map')).toEqual(true);
+        expect(await sandbox.exists('packages/client/lib/index.d.ts')).toEqual(true);
+        expect(await sandbox.exists('packages/client/lib/index.d.ts.map')).toEqual(true);
+        expect(await sandbox.exists('packages/shared/lib/index.js')).toEqual(false);
+        expect(await sandbox.exists('packages/client/lib/index.js')).toEqual(false);
+
+        expect(await sandbox.read('packages/shared/lib/tsconfig.tsbuildinfo')).not.toEqual('');
+        expect(await sandbox.read('packages/client/lib/tsconfig.tsbuildinfo')).not.toEqual('');
+
+        await sandbox.remove('packages/shared/lib');
+        await sandbox.remove('packages/client/lib');
+        break;
+
       case 'write-references':
         expect(await sandbox.exists('packages/shared/lib/tsconfig.tsbuildinfo')).toEqual(true);
         expect(await sandbox.exists('packages/client/lib/tsconfig.tsbuildinfo')).toEqual(true);

test/unit/typescript-reporter/TypeScriptReporterConfiguration.spec.ts

@@ -74,6 +74,7 @@ describe('typescript-reporter/TypeScriptsReporterConfiguration', () => {
     [{ build: true }, { ...configuration, build: true }],
     [{ mode: 'readonly' }, { ...configuration, mode: 'readonly' }],
     [{ mode: 'write-tsbuildinfo' }, { ...configuration, mode: 'write-tsbuildinfo' }],
+    [{ mode: 'write-dts' }, { ...configuration, mode: 'write-dts' }],
     [{ mode: 'write-references' }, { ...configuration, mode: 'write-references' }],
     [
       { configOverwrite: { compilerOptions: { strict: true }, include: ['src'] } },