ts-node performance

This repository is a show case for TypeStrong/ts-node#754

Run npm run test to run tests using ts-node. Run npm run test-js to run tests without ts-node. It compiles TS files using TypeScript compiler and then it runs mocha tests for these JS files. Surprisingly, JS-based tests are faster than tests using ts-node (unless cache is used). If I set files: true in init.js, the performance is better.

How did I measure things

I updated the dist of ts-node in node_modules, file index.js, line 270:

const startTime = Date.now();
var output = service_1.getEmitOutput(fileName);
console.log(`>>> time: ${Date.now() - startTime} ms fileName: ${fileName}`);

With files: false, the compilation of a random *.spec.ts takes about 20 ms. With files: false it takes about 2 ms. Typical output when I run npm run test:

>>> time: 452 ms fileName: /ts-node-perf/src/clean-math-1/clean-math.spec.ts
>>> time: 10 ms fileName: /ts-node-perf/src/clean-math-1/clean-math.ts
>>> time: 21 ms fileName: /ts-node-perf/src/clean-math-2/clean-math.spec.ts
>>> time: 3 ms fileName: /ts-node-perf/src/clean-math-2/clean-math.ts
>>> time: 20 ms fileName: /ts-node-perf/src/clean-math-3/clean-math.spec.ts
>>> time: 1 ms fileName: /ts-node-perf/src/clean-math-3/clean-math.ts
>>> time: 18 ms fileName: /ts-node-perf/src/clean-math-4/clean-math.spec.ts
>>> time: 2 ms fileName: /ts-node-perf/src/clean-math-4/clean-math.ts
>>> time: 29 ms fileName: /ts-node-perf/src/clean-math-5/clean-math.spec.ts
>>> time: 2 ms fileName: /ts-node-perf/src/clean-math-5/clean-math.ts
>>> time: 21 ms fileName: /ts-node-perf/src/clean-math-6/clean-math.spec.ts
>>> time: 1 ms fileName: /ts-node-perf/src/clean-math-6/clean-math.ts
>>> time: 19 ms fileName: /ts-node-perf/src/clean-math-7/clean-math.spec.ts
>>> time: 1 ms fileName: /ts-node-perf/src/clean-math-7/clean-math.ts
>>> time: 22 ms fileName: /ts-node-perf/src/clean-math-8/clean-math.spec.ts
>>> time: 2 ms fileName: /ts-node-perf/src/clean-math-8/clean-math.ts
>>> time: 14 ms fileName: /ts-node-perf/src/clean-math-9/clean-math.spec.ts
>>> time: 2 ms fileName: /ts-node-perf/src/clean-math-9/clean-math.ts
>>> time: 16 ms fileName: /ts-node-perf/src/clean-math/clean-math.spec.ts
>>> time: 1 ms fileName: /ts-node-perf/src/clean-math/clean-math.ts