This repository demonstrates a memory leak when requiring Nunjucks using Jest. The issue is fixed in Nunjucks v3.2.1, I assume the old version of chokidar was responsible.

• npm ci
• npm run test

The heap size increases by about 4MB with every test file run (i.e. on every require("nunjucks");).

• Comment out the require("nunjucks"); line from setupTests.js
• npm run test

The heap size should remain constant.