245 lines
6.5 KiB
Markdown
245 lines
6.5 KiB
Markdown
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# vfile-message
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[![Build][build-badge]][build]
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[![Coverage][coverage-badge]][coverage]
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[![Downloads][downloads-badge]][downloads]
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[![Size][size-badge]][size]
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[![Sponsors][sponsors-badge]][collective]
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[![Backers][backers-badge]][collective]
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[![Chat][chat-badge]][chat]
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Create [vfile][] messages.
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## Contents
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* [What is this?](#what-is-this)
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* [When should I use this?](#when-should-i-use-this)
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* [Install](#install)
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* [Use](#use)
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* [API](#api)
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* [`VFileMessage(reason[, place][, origin])`](#vfilemessagereason-place-origin)
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* [Well-known](#well-known)
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* [Types](#types)
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* [Compatibility](#compatibility)
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* [Contribute](#contribute)
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* [License](#license)
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## What is this?
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This package provides a (lint) message format.
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## When should I use this?
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In most cases, you can use `file.message` from `VFile` itself, but in some
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cases you might not have a file, and still want to emit warnings or errors,
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in which case this can be used directly.
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## Install
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This package is [ESM only][esm].
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In Node.js (version 14.14+ and 16.0+), install with [npm][]:
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```sh
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npm install vfile-message
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```
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In Deno with [`esm.sh`][esmsh]:
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```js
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import {VFileMessage} from 'https://esm.sh/vfile-message@3'
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```
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In browsers with [`esm.sh`][esmsh]:
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```html
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<script type="module">
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import {VFileMessage} from 'https://esm.sh/vfile-message@3?bundle'
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</script>
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```
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## Use
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```js
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import {VFileMessage} from 'vfile-message'
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const message = new VFileMessage(
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'Unexpected unknown word `braavo`, did you mean `bravo`?',
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{line: 1, column: 8},
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'spell:typo'
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)
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console.log(message)
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```
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Yields:
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```txt
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[1:8: Unexpected unknown word `braavo`, did you mean `bravo`?] {
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reason: 'Unexpected unknown word `braavo`, did you mean `bravo`?',
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line: 1,
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column: 8,
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source: 'spell',
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ruleId: 'typo',
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position: {start: {line: 1, column: 8}, end: {line: null, column: null}}
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}
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```
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## API
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This package exports the identifier [`VFileMessage`][api-vfile-message].
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There is no default export.
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### `VFileMessage(reason[, place][, origin])`
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Create a message for `reason` at `place` from `origin`.
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When an error is passed in as `reason`, the `stack` is copied.
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###### Parameters
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* `reason` (`string` or `Error`)
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— reason for message, uses the stack and message of the error if given
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* `place` ([`Node`][node], [`Position`][position], or [`Point`][point],
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optional)
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— place in file where the message occurred
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* `origin` (`string`, optional)
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— place in code where the message originates (example:
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`'my-package:my-rule'` or `'my-rule'`)
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###### Extends
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[`Error`][error].
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###### Returns
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Instance of `VFileMessage`.
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###### Fields
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* `reason` (`string`)
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— reason for message (you should use markdown)
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* `fatal` (`boolean | null | undefined`)
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— state of problem; `true` marks associated file as no longer processable
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(error); `false` necessitates a (potential) change (warning);
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`null | undefined` for things that might not need changing (info)
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* `line` (`number | null`)
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— starting line of error
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* `column` (`number | null`)
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— starting column of error
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* `position` ([`Position | null`][position])
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— full unist position
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* `source` (`string | null`, example: `'my-package'`)
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— namespace of message
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* `ruleId` (`string | null`, example: `'my-rule'`)
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— category of message
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* `stack` (`string | null`)
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— stack of message in code
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* `file` (`string | null`)
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— path of a file (used throughout the `VFile` ecosystem)
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### Well-known
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It’s OK to store custom data directly on the `VFileMessage`, some of those are
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handled by [utilities][util].
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The following fields are documented and typed here.
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###### Fields
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* `actual` (`string | null`)
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— specify the source value that’s being reported, which is deemed incorrect
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* `expected` (`Array<string> | null`)
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— suggest acceptable values that can be used instead of `actual`
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* `url` (`string | null`)
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— link to docs for the message (this must be an absolute URL that can be
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passed as `x` to `new URL(x)`)
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* `note` (`string | null`)
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— long form description of the message (you should use markdown)
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## Types
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This package is fully typed with [TypeScript][].
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It exports no additional types.
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## Compatibility
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Projects maintained by the unified collective are compatible with all maintained
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versions of Node.js.
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As of now, that is Node.js 14.14+ and 16.0+.
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Our projects sometimes work with older versions, but this is not guaranteed.
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## Contribute
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See [`contributing.md`][contributing] in [`vfile/.github`][health] for ways to
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get started.
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See [`support.md`][support] for ways to get help.
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This project has a [code of conduct][coc].
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By interacting with this repository, organization, or community you agree to
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abide by its terms.
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## License
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[MIT][license] © [Titus Wormer][author]
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<!-- Definitions -->
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[build-badge]: https://github.com/vfile/vfile-message/workflows/main/badge.svg
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[build]: https://github.com/vfile/vfile-message/actions
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[coverage-badge]: https://img.shields.io/codecov/c/github/vfile/vfile-message.svg
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[coverage]: https://codecov.io/github/vfile/vfile-message
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[downloads-badge]: https://img.shields.io/npm/dm/vfile-message.svg
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[downloads]: https://www.npmjs.com/package/vfile-message
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[size-badge]: https://img.shields.io/bundlephobia/minzip/vfile-message.svg
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[size]: https://bundlephobia.com/result?p=vfile-message
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[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
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[backers-badge]: https://opencollective.com/unified/backers/badge.svg
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[collective]: https://opencollective.com/unified
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[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
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[chat]: https://github.com/vfile/vfile/discussions
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[npm]: https://docs.npmjs.com/cli/install
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[contributing]: https://github.com/vfile/.github/blob/main/contributing.md
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[support]: https://github.com/vfile/.github/blob/main/support.md
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[health]: https://github.com/vfile/.github
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[coc]: https://github.com/vfile/.github/blob/main/code-of-conduct.md
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[esm]: https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c
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[esmsh]: https://esm.sh
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[typescript]: https://www.typescriptlang.org
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[license]: license
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[author]: https://wooorm.com
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[error]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error
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[node]: https://github.com/syntax-tree/unist#node
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[position]: https://github.com/syntax-tree/unist#position
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[point]: https://github.com/syntax-tree/unist#point
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[vfile]: https://github.com/vfile/vfile
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[util]: https://github.com/vfile/vfile#utilities
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[api-vfile-message]: #vfilemessagereason-place-origin
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