fix: support TypeScript project references

src/index.js

@@ -369,6 +369,9 @@ function ncc (
                 module: 'esnext',
                 target: 'esnext',
                 ...fullTsconfig.compilerOptions,
+                // ncc bundles the root project and its dependencies as one compilation.
+                // Disable composite's implicit rootDir so referenced sources are included.
+                composite: false,
                 allowSyntheticDefaultImports: true,
                 noEmit: false,
                 outDir: '//'

test/unit.test.js

@@ -26,11 +26,13 @@ for (const unitTest of fs.readdirSync(`${__dirname}/unit`)) {
       opts = JSON.parse(opts);
     } catch (_) {}
 
-    // set env variable so tsconfig-paths can find the config
-    process.env.TS_NODE_PROJECT = `${testDir}/tsconfig.json`;
     // find the name of the input file (e.g input.ts)
-    const inputFile = fs.readdirSync(testDir).find(file => file.includes("input"));
-    await ncc(`${testDir}/${inputFile}`, Object.assign({
+    const rootInput = fs.readdirSync(testDir).find(file => file.includes("input"));
+    const inputDir = rootInput ? testDir : `${testDir}/app`;
+    const inputFile = rootInput || fs.readdirSync(inputDir).find(file => file.includes("input"));
+    // set env variable so tsconfig-paths can find the config
+    process.env.TS_NODE_PROJECT = `${inputDir}/tsconfig.json`;
+    await ncc(`${inputDir}/${inputFile}`, Object.assign({
       assetBuilds: true,
       transpileOnly: true,
       customEmit (path) {

test/unit/ts-project-references/app/input.ts

@@ -0,0 +1,3 @@
+import { hello } from '../lib/index';
+
+console.log(hello());

test/unit/ts-project-references/app/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "outDir": "dist"
+  },
+  "include": ["input.ts"],
+  "references": [
+    {
+      "path": "../lib"
+    }
+  ]
+}

test/unit/ts-project-references/lib/index.ts

@@ -0,0 +1,3 @@
+export function hello() {
+  return 'Hello, World!';
+}

test/unit/ts-project-references/lib/tsconfig.json

@@ -0,0 +1,6 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "outDir": "dist"
+  }
+}

test/unit/ts-project-references/opt.json

@@ -0,0 +1,4 @@
+{
+  "cache": false,
+  "transpileOnly": false
+}

test/unit/ts-project-references/output-coverage.js

@@ -0,0 +1,21 @@
+/******/ (() => { // webpackBootstrap
+/******/ 	"use strict";
+/******/ 	/* webpack/runtime/compat */
+/******/ 	
+/******/ 	if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = __dirname + "/";
+/******/ 	
+/************************************************************************/
+var __webpack_exports__ = {};
+
+;// CONCATENATED MODULE: ./test/unit/ts-project-references/lib/index.ts
+function hello() {
+    return 'Hello, World!';
+}
+
+;// CONCATENATED MODULE: ./test/unit/ts-project-references/app/input.ts
+
+console.log(hello());
+
+module.exports = __webpack_exports__;
+/******/ })()
+;

test/unit/ts-project-references/output.js

@@ -0,0 +1,21 @@
+/******/ (() => { // webpackBootstrap
+/******/ 	"use strict";
+/******/ 	/* webpack/runtime/compat */
+/******/ 	
+/******/ 	if (typeof __nccwpck_require__ !== 'undefined') __nccwpck_require__.ab = __dirname + "/";
+/******/ 	
+/************************************************************************/
+var __webpack_exports__ = {};
+
+;// CONCATENATED MODULE: ./test/unit/ts-project-references/lib/index.ts
+function hello() {
+    return 'Hello, World!';
+}
+
+;// CONCATENATED MODULE: ./test/unit/ts-project-references/app/input.ts
+
+console.log(hello());
+
+module.exports = __webpack_exports__;
+/******/ })()
+;