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flexible jest reporter that provides ability to show statistics of warnings and group them","maintainers":[{"email":"cloud@90poe.io","name":"paulanton"},{"email":"samuel.lopez@90poe.io","name":"slopez90poe"},{"email":"gary.lloyd@90poe.io","name":"garylloyd"},{"email":"mosconfabrizio@gmail.com","name":"fabmos"},{"email":"about.wilde@gmail.com","name":"andrew.wilde"},{"email":"Simon.Truss@90poe.io","name":"simont90poe"},{"email":"anasim669@gmail.com","name":"annmedvid"},{"email":"dmytro.gorelik@gmail.com","name":"dhorelik"},{"email":"daria.gorchylina@gmail.com","name":"madelgeek"},{"email":"anatolii.omelchenko@90poe.io","name":"anatolii.omelchenko"}],"readme":"# @90poe/jest-performant-warnings-stats-reporter\n\nThis is a custom jest reporter that recursively collects all warnings while tests run and notifying user _afterwards_ improving performance.\n\n## Motivation\n\nWe had problems with:\n\n1. Slow tests run on CI even with silent mode\n1. When running tests locally noise in the terminal slows tests enormously\n\n## List of superpowers\n\n- more performant than default one (check [benchmark](#benchmarks))\n- can provide statistics on warnings for every test suite (see [example](#showwarningsummary-true))\n- can show slowest tests (see [example](#showslowest-true))\n\n## Installation\n\n```shell\nyarn add @90poe/jest-performant-warnings-stats-reporter --dev\n```\n\nor\n\n```shell\nnpm install @90poe/jest-performant-warnings-stats-reporter --save-dev\n```\n\n## Usage\n\nIn your jest config add the following entry:\n\n```javascript\n{\n reporters: [\n [\n '@90poe/jest-performant-warnings-stats-reporter',\n {\n showSlowest: false,\n maxSlowTests: 5,\n warnOnSlowerThan: 1000,\n showWarningSummary: false,\n warningsConfig: [\n {\n name: 'act(...) warnings',\n regex: /act(...)/im,\n },\n {\n name: 'React Key Issues',\n regex: /Encountered two children with the same key/im,\n },\n // ...\n ],\n },\n ],\n ],\n}\n```\n\n## Configuration\n\n`@90poe/jest-performant-warnings-stats-reporter` configuration is based on [Jest](https://facebook.github.io/jest/docs/en/configuration.html), available options are shown below.\n\n| Option | Description | type | Default value |\n| :----------------: | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :-----------------------------------------: | :-----------: |\n| showSlowest | `true / false` flag whether to show slowest tests or not | `boolean` | `false` |\n| maxSlowTests | quantity of slowest tests to show, dependant on `showSlowest` flag | `number` | `5` |\n| warnOnSlowerThan | a limit in milliseconds, used to identify slow tests | `number` | `400` |\n| showWarningSummary | `true / false` flag whether to show detailed information on warnings | `boolean` | `false` |\n| warningsConfig | an `array` of objects with `name` and `regexp` props, where `name` is title for a warning and `regexp` is regular expression used to match the console warning. Dependant on `showWarningSummary` flag | Array<{ name: `string`, regexp: `RegExp` }> | [] |\n\n## Sample of output for different configurations\n\n### showSlowest: true\n\n
\n \"Sample\n
\n\n### showWarningSummary: false\n\n
\n \"Sample\n
\n\n### showWarningSummary: true\n\n
\n \"Sample\n
\n\n## Benchmarks\n\nUsing [hyperfine](https://github.com/sharkdp/hyperfine) for running 130 test suites in real world project, we can see advantage in performance comparing with:\n\n- default reporter (up to 20% improvement possible, varies by the number of warnings that exist)\n- default reporter with silent mode on (up to 5% improvement)\n\n### default jest reporter\n\n
\n \"Sample\n
\n\n### default jest reporter with silent mode on\n\n
\n \"Sample\n
\n\n### @90poe/jest-performant-warnings-stats-reporter\n\n
\n \"Sample\n
\n\n## Contribution\n\n[Document](ISSUE_TEMPLATE.md)\n\n## Code of conduct\n\n[Document](CODE_OF_CONDUCT.md)\n\n## Licence\n\n[MIT](LICENSE.md)\n","readmeFilename":"README.md"}