Detect memory leak w/ Jest

detect-memory-leak-with-jest.md

ref: https://stackoverflow.com/a/62885391

Run test with the following command:

node --expose-gc ./node_modules/.bin/jest --runInBand --logHeapUsage

• --expose-gc is V8 options (see node --v8-options)
• --logHeapUsage: https://jestjs.io/docs/cli#--logheapusage

---

workaround: https://jestjs.io/docs/configuration#workeridlememorylimit-numberstring

• Bump jest to v29.5 or over
• Set workerIdleMemoryLimit in jest.config.ts

import { type Config } from "jest";

const config: Config = {
  workerIdleMemoryLimit: "500MB",
};

export default config;