jest.config.js

const path = require("path");

const pathAsArr = process.env.PNPM_SCRIPT_SRC_DIR.split(path.sep);
const packageName = pathAsArr[pathAsArr.length - 1];

module.exports = {
  preset: "ts-jest",
  testMatch: ["**/test/**/*.[jt]s?(x)", "**/src/**/*.test.ts"],
  testEnvironment: "node",
  collectCoverage: true,
  coveragePathIgnorePatterns: ["/node_modules/"],
  testPathIgnorePatterns: ["/fixtures/", "/__fixtures__/", "<rootDir>/test/utils/.+"],
  testTimeout: 4 * 60 * 1000, // 4 minutes
  setupFilesAfterEnv: [path.join(__dirname, "jest.setup.js")],
  cacheDirectory: path.join(__dirname, ".jest-cache", packageName),
  // Many tests change the dist tags of packages.
  // Unfortunately, this means that if two such tests will run at the same time,
  // they may break each other.
  maxWorkers: 1,
};