fix: typescript createProgram doesn't support incremental mode (#5346)

* fix: typescript createProgram doesn't support incremental mode

* test: added test for PR #5346

Co-authored-by: Jasper De Moor <jasperdemoor@gmail.com>

packages/core/integration-tests/test/integration/ts-types/composite/add.ts

@@ -0,0 +1 @@
+export const add = (a: number, b: number) => a + b;

packages/core/integration-tests/test/integration/ts-types/composite/expected.d.ts

@@ -0,0 +1,3 @@
+export const add: (a: number, b: number) => number;
+
+//# sourceMappingURL=index.d.ts.map

packages/core/integration-tests/test/integration/ts-types/composite/index.ts

@@ -0,0 +1 @@
+export * from './add';

packages/core/integration-tests/test/integration/ts-types/composite/package.json

@@ -0,0 +1,6 @@
+{
+  "name": "ts-composite",
+  "private": true,
+  "main": "dist/main.js",
+  "types": "dist/index.d.ts"
+}

packages/core/integration-tests/test/integration/ts-types/composite/tsconfig.json

@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "composite": true,
+  },
+  "files": [
+    "index.ts",
+    "add.ts"
+  ],
+  "references": []
+}

packages/core/integration-tests/test/ts-types.js

@@ -194,4 +194,22 @@ describe('typescript types', function() {
 
     assert(/import\s*{\s*B\s*}\s*from\s*"b";/.test(dist));
   });
+
+  it('should generate a typescript declaration file even when composite is true', async function() {
+    await bundle(
+      path.join(__dirname, '/integration/ts-types/composite/index.ts'),
+    );
+
+    let dist = (
+      await outputFS.readFile(
+        path.join(__dirname, '/integration/ts-types/composite/dist/index.d.ts'),
+        'utf8',
+      )
+    ).replace(/\r\n/g, '\n');
+    let expected = await inputFS.readFile(
+      path.join(__dirname, '/integration/ts-types/composite/expected.d.ts'),
+      'utf8',
+    );
+    assert.equal(dist, expected);
+  });
 });

packages/transformers/typescript-types/src/TSTypesTransformer.js

@@ -39,6 +39,8 @@ export default (new Transformer({
       emitDeclarationOnly: true,
       outFile: 'index.d.ts',
       moduleResolution: ts.ModuleResolutionKind.NodeJs,
+      // createProgram doesn't support incremental mode
+      composite: false,
     };
 
     let host = new CompilerHost(options.inputFS, ts, logger);