Benchmark mobx with different ways of using

How to run

npm run build
npm run bench

Result

For me: Macbook Air M1

base x 16,671 ops/sec ±1.52% (85 runs sampled)
makeObservable x 35.58 ops/sec ±3.32% (50 runs sampled)
legacy-decorators x 30.85 ops/sec ±4.35% (57 runs sampled)
decorators x 53.88 ops/sec ±2.98% (71 runs sampled)
Fastest except base: decorators