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https://github.com/unifiedjs/unified-diff

plugin to ignore unrelated CI messages
https://github.com/unifiedjs/unified-diff

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plugin to ignore unrelated CI messages

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# unified-diff



[![Build][build-badge]][build]

[![Coverage][coverage-badge]][coverage]

[![Downloads][downloads-badge]][downloads]

[![Sponsors][sponsors-badge]][collective]

[![Backers][backers-badge]][collective]

[![Chat][chat-badge]][chat]



**[unified][]** plugin to ignore unrelated messages in GitHub Actions and

Travis.



## Contents



*   [What is this?](#what-is-this)

*   [When should I use this?](#when-should-i-use-this)

*   [Install](#install)

*   [Use](#use)

*   [API](#api)

    *   [`unified().use(unifiedDiff)`](#unifieduseunifieddiff)

*   [Types](#types)

*   [Compatibility](#compatibility)

*   [Contribute](#contribute)

*   [License](#license)



## What is this?



This package is a [unified][] plugin to ignore unrelated lint messages in a CI.



**unified** is a project that transforms content with abstract syntax trees

(ASTs).

**vfile** is the virtual file interface used in unified which manages messages.

This is a unified plugin that filters messages on the vfile.



## When should I use this?



You can use this plugin when you are dealing with a large, existing project.



Using tools that check whether things follow a style guide is typically very

useful.

However, it can be hard to start using something in a large existing project.

This plugin helps, because it ignores messages that occur in lines that are not

touched by a PR in a CI.

When this plugin is used outside of a supported CIs, it doesn’t do anything.



## Install



This package is [ESM only][esm].

In Node.js (version 16+), install with [npm][]:



```sh

npm install unified-diff

```



In Deno with [`esm.sh`][esmsh]:



```js

import unifiedDiff from 'https://esm.sh/unified-diff@5'

```



In browsers with [`esm.sh`][esmsh]:



```html



  import unifiedDiff from 'https://esm.sh/unified-diff@5?bundle'



```



## Use



Say our document `example.md` contains:



```markdown

This is an an example.

```



> 👉 **Note**: `an an` is a typo.



…and our module `example.js` looks as follows:



```js

import process from 'node:process'

import remarkParse from 'remark-parse'

import remarkRetext from 'remark-retext'

import remarkStringify from 'remark-stringify'

import retextEnglish from 'retext-english'

import retextIndefiniteArticle from 'retext-indefinite-article'

import retextRepeatedWords from 'retext-repeated-words'

import {read} from 'to-vfile'

import {unified} from 'unified'

import unifiedDiff from 'unified-diff'

import {reporter} from 'vfile-reporter'



const file = await unified()

  .use(remarkParse)

  .use(

    remarkRetext,

    unified()

      .use(retextEnglish)

      .use(retextRepeatedWords)

      .use(retextIndefiniteArticle)

  )

  .use(remarkStringify)

  .use(unifiedDiff)

  .process(await read('example.md'))



console.error(reporter(file))

process.exitCode = file.messages.length > 0 ? 1 : 0

```



…and our Travis configuration `.travis.yml` contains:



```yml

# …

script:

- npm test

- node example.js

# …

```



> 👉 **Note**: an equivalent GH Actions workflow file is also supported.



Then, say someone creates a PR which adds the following diff:



```diff

diff --git a/example.md b/example.md

index 360b225..5a96b86 100644

--- a/example.md

+++ b/example.md

@@ -1 +1,3 @@

 This is an an example.

+

+Some more more text. A error.

```



> 👉 **Note**: `more more` and `A` before `error` are typos.



When run in CI, we’ll see the following printed on **stderr**(4).



```txt

example.md

   3:6-3:15  warning  Expected `more` once, not twice   retext-repeated-words      retext-repeated-words

  3:22-3:23  warning  Use `An` before `error`, not `A`  retext-indefinite-article  retext-indefinite-article



⚠ 2 warnings

```



> 👉 **Note**: `an an` on L1 is not included because it’s unrelated to this PR.



The build exits with `1` as there are messages, thus failing CI.

The user sees this and amends the PR to the following:



```diff

diff --git a/example.md b/example.md

index 360b225..5a96b86 100644

--- a/example.md

+++ b/example.md

@@ -1 +1,3 @@

 This is an an example.

+

+Some more text. An error.

```



This time our lint task exits successfully, even though L1 would normally emit

an error, but it’s unrelated to the PR.



## API



This package exports no identifiers.

The default export is [`unifiedDiff`][api-unified-diff].



### `unified().use(unifiedDiff)`



Ignore unrelated messages in GitHub Actions and Travis.



There are no options.

If there’s a `TRAVIS_COMMIT_RANGE`, `GITHUB_BASE_REF` and `GITHUB_HEAD_REF`, or

`GITHUB_SHA` environment variable, then this plugin runs, otherwise it does

nothing.



###### To do



*   [ ] Add support for other CIs (ping if you want to work on this)

*   [ ] Add non-CI support (I’m not sure how though)



PRs welcome!



###### Returns



Transform ([`Transformer`][transformer]).



## Types



This package is fully typed with [TypeScript][].

It exports no additional types.



## Compatibility



Projects maintained by the unified collective are compatible with maintained

versions of Node.js.



When we cut a new major release, we drop support for unmaintained versions of

Node.

This means we try to keep the current release line, `unified-diff@^5`,

compatible with Node.js 16.



## Contribute



See [`contributing.md`][contributing] in [`unifiedjs/.github`][health] for ways

to get started.

See [`support.md`][support] for ways to get help.



This project has a [code of conduct][coc].

By interacting with this repository, organization, or community you agree to

abide by its terms.



## License



[MIT][license] © [Titus Wormer][author]



[build-badge]: https://github.com/unifiedjs/unified-diff/workflows/main/badge.svg



[build]: https://github.com/unifiedjs/unified-diff/actions



[coverage-badge]: https://img.shields.io/codecov/c/github/unifiedjs/unified-diff.svg



[coverage]: https://codecov.io/github/unifiedjs/unified-diff



[downloads-badge]: https://img.shields.io/npm/dm/unified-diff.svg



[downloads]: https://www.npmjs.com/package/unified-diff



[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg



[backers-badge]: https://opencollective.com/unified/backers/badge.svg



[collective]: https://opencollective.com/unified



[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg



[chat]: https://github.com/unifiedjs/unified/discussions



[npm]: https://docs.npmjs.com/cli/install



[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c



[esmsh]: https://esm.sh



[typescript]: https://www.typescriptlang.org



[health]: https://github.com/unifiedjs/.github



[contributing]: https://github.com/unifiedjs/.github/blob/main/contributing.md



[support]: https://github.com/unifiedjs/.github/blob/main/support.md



[coc]: https://github.com/unifiedjs/.github/blob/main/code-of-conduct.md



[license]: license



[author]: https://wooorm.com



[unified]: https://github.com/unifiedjs/unified



[transformer]: https://github.com/unifiedjs/unified#transformer



[api-unified-diff]: #unifieduseunifieddiff