properly test local ts integration

src/typescript.js

@@ -1 +1,14 @@
-module.exports = require("typescript");
+
+const { Module } = require('module');
+const m = new Module('', null);
+m.paths = Module._nodeModulePaths(process.env.TYPESCRIPT_LOOKUP_PATH || (process.cwd() + '/'));
+let typescript;
+try {
+  typescript = m.require('typescript');
+  console.log("ncc: Using typescript@" + typescript.version + " (local user-provided)");
+}
+catch (e) {
+  typescript = require('typescript');
+  console.log("ncc: Using typescript@" + typescript.version + " (ncc built-in)");
+}
+module.exports = typescript;

test/index.test.js

@@ -57,6 +57,8 @@ for (const integrationTest of fs.readdirSync(__dirname + "/integration")) {
   // disabled pending https://github.com/zeit/ncc/issues/141
   if (integrationTest.endsWith('loopback.js')) continue;
 
+  if (!integrationTest.endsWith('test.ts')) continue;
+
   const { Writable } = require('stream');
   class StoreStream extends Writable {
     constructor (options) {
@@ -70,6 +72,11 @@ for (const integrationTest of fs.readdirSync(__dirname + "/integration")) {
   }
 
   it(`should execute "ncc run ${integrationTest}"`, async () => {
+    let expectedStdout;
+    try {
+      expectedStdout = fs.readFileSync(`${__dirname}/integration/${integrationTest}.stdout`).toString();
+    }
+    catch (e) {}
     if (global.gc) global.gc();
     const stdout = new StoreStream();
     const stderr = new StoreStream();
@@ -90,6 +97,12 @@ for (const integrationTest of fs.readdirSync(__dirname + "/integration")) {
       if (chunk.toString().startsWith('(node:')) return;
       throw new Error(chunk.toString());
     });
+    if (expectedStdout) {
+      let stdoutStr = '';
+      for (const chunk of stdout.data)
+        stdoutStr += chunk.toString();
+      expect(stdoutStr.startsWith(expectedStdout));
+    }
   });
 }
 

test/integration/test.ts

@@ -0,0 +1,2 @@
+var p: boolean = false;
+console.log(p);