{
  "jest": {
    "watchPlugins": [
      ["jest-watch-exec", { "on-start": "npm run build" }],
      ["jest-watch-exec", { "on-start-script": "somescript.js" }],
      // Will run the `run(): boolean | Promise<boolean>` method exposed by the module
      ["jest-watch-exec", { "on-start-module": "modulescript.js" }],
      // Will run test even if on-start | on-start-script | on-start-module fails.
      ["jest-watch-exec", { "on-start-ignore-error": true, ... }],
      // execute script when there are passing tests.
      // will not execute if the tests are filtered.
      ["jest-watch-exec", { "on-pass": "npm run build" }],
      // execute 'on-pass' even the tests are filtered.
      ["jest-watch-exec", { "on-pass": "npm run build", "exec-while-filtered": true }]
    ]
  }
}