tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

1 files changed, 285 insertions, 0 deletions

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+# ![vfile][]
+
+[![Build Status][build-badge]][build-status]
+[![Coverage Status][coverage-badge]][coverage-status]
+
+**VFile** is a virtual file format used by [**unified**][unified],
+a text processing umbrella (it powers [**retext**][retext] for
+natural language, [**remark**][remark] for markdown, and
+[**rehype**][rehype] for HTML).  Each processors that parse, transform,
+and compile text, and need a virtual representation of files and a
+place to store [messages][] about them.  Plus, they work in the browser.
+**VFile** provides these requirements at a small size, in IE 9 and up.
+
+> **VFile** is different from the excellent [**vinyl**][vinyl]
+> in that it has a smaller API, a smaller size, and focuses on
+> [messages][].
+
+VFile can be used anywhere where files need a lightweight representation.
+For example, it’s used in:
+
+*   [`documentation`](https://github.com/documentationjs/documentation)
+    — The documentation system for modern JavaScript
+*   [`weh`](https://github.com/wehjs/weh)
+    — Declarative small site generator
+*   [`geojsonhint`](https://github.com/mapbox/geojsonhint)
+    — Complete, fast, standards-based validation for geojson
+
+## Installation
+
+[npm][]:
+
+```bash
+npm install vfile
+```
+
+## Table of Contents
+
+*   [Usage](#usage)
+*   [Utilities](#utilities)
+*   [Reporters](#reporters)
+*   [API](#api)
+    *   [VFile(\[options\])](#vfileoptions)
+    *   [vfile.contents](#vfilecontents)
+    *   [vfile.cwd](#vfilecwd)
+    *   [vfile.path](#vfilepath)
+    *   [vfile.basename](#vfilebasename)
+    *   [vfile.stem](#vfilestem)
+    *   [vfile.extname](#vfileextname)
+    *   [vfile.dirname](#vfiledirname)
+    *   [vfile.history](#vfilehistory)
+    *   [vfile.messages](#vfilemessages)
+    *   [vfile.data](#vfiledata)
+    *   [VFile#toString(\[encoding\])](#vfiletostringencoding)
+    *   [VFile#message(reason\[, position\]\[, origin\])](#vfilemessagereason-position-origin)
+    *   [VFile#info(reason\[, position\]\[, origin\])](#vfileinforeason-position-origin)
+    *   [VFile#fail(reason\[, position\]\[, origin\])](#vfilefailreason-position-origin)
+*   [License](#license)
+
+## Usage
+
+```js
+var vfile = require('vfile');
+
+var file = vfile({path: '~/example.txt', contents: 'Alpha *braavo* charlie.'});
+
+file.path; //=> '~/example.txt'
+file.dirname; //=> '~'
+
+file.extname = '.md';
+
+file.basename; //=> 'example.md'
+
+file.basename = 'index.text';
+
+file.history; //=> ['~/example.txt', '~/example.md', '~/index.text']
+
+file.message('`braavo` is misspelt; did you mean `bravo`?', {line: 1, column: 8});
+
+console.log(file.messages);
+```
+
+Yields:
+
+```js
+[ { [~/index.text:1:8: `braavo` is misspelt; did you mean `bravo`?]
+    message: '`braavo` is misspelt; did you mean `bravo`?',
+    name: '~/index.text:1:8',
+    file: '~/index.text',
+    reason: '`braavo` is misspelt; did you mean `bravo`?',
+    line: 1,
+    column: 8,
+    location: { start: [Object], end: [Object] },
+    ruleId: null,
+    source: null,
+    fatal: false } ]
+```
+
+## Utilities
+
+The following list of projects includes tools for working with virtual
+files.  See [**Unist**][unist] for projects working with nodes.
+
+*   [`convert-vinyl-to-vfile`](https://github.com/dustinspecker/convert-vinyl-to-vfile)
+    — Convert from [Vinyl][]
+*   [`is-vfile-message`](https://github.com/shinnn/is-vfile-message)
+    — Check if a value is a `VMessage` object
+*   [`to-vfile`](https://github.com/vfile/to-vfile)
+    — Create a virtual file from a file-path (and optionally read it)
+*   [`vfile-find-down`](https://github.com/vfile/vfile-find-down)
+    — Find files by searching the file system downwards
+*   [`vfile-find-up`](https://github.com/vfile/vfile-find-up)
+    — Find files by searching the file system upwards
+*   [`vfile-location`](https://github.com/vfile/vfile-location)
+    — Convert between line/column- and range-based locations
+*   [`vfile-statistics`](https://github.com/vfile/vfile-statistics)
+    — Count messages per category
+*   [`vfile-messages-to-vscode-diagnostics`](https://github.com/shinnn/vfile-messages-to-vscode-diagnostics)
+    — Convert to VS Code diagnostics
+*   [`vfile-sort`](https://github.com/vfile/vfile-sort)
+    — Sort messages by line/column
+*   [`vfile-to-eslint`](https://github.com/vfile/vfile-to-eslint)
+    — Convert VFiles to ESLint formatter compatible output
+
+## Reporters
+
+The following list of projects show linting results for given virtual files.
+Reporters _must_ accept `Array.<VFile>` as their first argument, and return
+`string`.  Reporters _may_ accept other values too, in which case it’s suggested
+to stick to `vfile-reporter`s interface.
+
+*   [`vfile-reporter`][reporter]
+    — Stylish reporter
+*   [`vfile-reporter-json`](https://github.com/vfile/vfile-reporter-json)
+    — JSON reporter
+*   [`vfile-reporter-pretty`](https://github.com/vfile/vfile-reporter-pretty)
+    — Pretty reporter
+
+## API
+
+### `VFile([options])`
+
+Create a new virtual file.  If `options` is `string` or `Buffer`, treats
+it as `{contents: options}`.  If `options` is a `VFile`, returns it.
+All other options are set on the newly created `vfile`.
+
+Path related properties are set in the following order (least specific
+to most specific): `history`, `path`, `basename`, `stem`, `extname`,
+`dirname`.
+
+It’s not possible to set either `dirname` or `extname` without setting
+either `history`, `path`, `basename`, or `stem` as well.
+
+###### Example
+
+```js
+vfile();
+vfile('console.log("alpha");');
+vfile(Buffer.from('exit 1'));
+vfile({path: path.join(__dirname, 'readme.md')});
+vfile({stem: 'readme', extname: '.md', dirname: __dirname});
+vfile({other: 'properties', are: 'copied', ov: {e: 'r'}});
+```
+
+### `vfile.contents`
+
+`Buffer`, `string`, `null` — Raw value.
+
+### `vfile.cwd`
+
+`string` — Base of `path`.  Defaults to `process.cwd()`.
+
+### `vfile.path`
+
+`string?` — Path of `vfile`.  Cannot be nullified.
+
+### `vfile.basename`
+
+`string?` — Current name (including extension) of `vfile`.  Cannot
+contain path separators.  Cannot be nullified either (use
+`file.path = file.dirname` instead).
+
+### `vfile.stem`
+
+`string?` — Name (without extension) of `vfile`.  Cannot be nullified,
+and cannot contain path separators.
+
+### `vfile.extname`
+
+`string?` — Extension (with dot) of `vfile`.  Cannot be set if
+there’s no `path` yet and cannot contain path separators.
+
+### `vfile.dirname`
+
+`string?` — Path to parent directory of `vfile`.  Cannot be set if
+there’s no `path` yet.
+
+### `vfile.history`
+
+`Array.<string>` — List of file-paths the file moved between.
+
+### `vfile.messages`
+
+[`Array.<VMessage>`][message] — List of messages associated with the file.
+
+### `vfile.data`
+
+`Object` — Place to store custom information.  It’s OK to store custom
+data directly on the `vfile`, moving it to `data` gives a _little_ more
+privacy.
+
+### `VFile#toString([encoding])`
+
+Convert contents of `vfile` to string.  If `contents` is a buffer,
+`encoding` is used to stringify buffers (default: `'utf8'`).
+
+### `VFile#message(reason[, position][, origin])`
+
+Associates a message with the file, where `fatal` is set to `false`.
+Constructs a new [`VMessage`][vmessage] and adds it to
+[`vfile.messages`][messages].
+
+##### Returns
+
+[`VMessage`][vmessage].
+
+### `VFile#info(reason[, position][, origin])`
+
+Associates an informational message with the file, where `fatal` is set to
+`null`.  Calls [`#message()`][message] internally.
+
+##### Returns
+
+[`VMessage`][vmessage].
+
+### `VFile#fail(reason[, position][, origin])`
+
+Associates a fatal message with the file, then immediately throws it.
+Note: fatal errors mean a file is no longer processable.
+Calls [`#message()`][message] internally.
+
+##### Throws
+
+[`VMessage`][vmessage].
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+<!-- Definitions -->
+
+[build-badge]: https://img.shields.io/travis/vfile/vfile.svg
+
+[build-status]: https://travis-ci.org/vfile/vfile
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/vfile/vfile.svg
+
+[coverage-status]: https://codecov.io/github/vfile/vfile
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[license]: LICENSE
+
+[author]: http://wooorm.com
+
+[vfile]: https://cdn.rawgit.com/vfile/vfile/f65510e/logo.svg
+
+[unified]: https://github.com/unifiedjs/unified
+
+[retext]: https://github.com/wooorm/retext
+
+[remark]: https://github.com/wooorm/remark
+
+[rehype]: https://github.com/wooorm/rehype
+
+[vinyl]: https://github.com/gulpjs/vinyl
+
+[unist]: https://github.com/syntax-tree/unist#list-of-utilities
+
+[reporter]: https://github.com/vfile/vfile-reporter
+
+[vmessage]: https://github.com/vfile/vfile-message
+
+[messages]: #vfilemessages
+
+[message]: #vfilemessagereason-position-origin