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185 lines
6.5 KiB
Markdown
185 lines
6.5 KiB
Markdown
# The stylelint Node API
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The stylelint module includes a `lint()` function that provides the Node API.
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```js
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stylelint.lint(options)
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.then(function(resultObject) { .. });
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```
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## Installation
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stylelint is an [npm package](https://www.npmjs.com/package/stylelint). Install it using:
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```console
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npm install stylelint
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```
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## Options
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Options is an object with the following properties.
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Though both `files` and `code` are "optional", you *must* have one and *cannot* have both. All other options are optional.
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### `code`
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A CSS string to be linted.
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### `codeFilename`
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If using `code` to pass a source string directly, you can use `codeFilename` to associate that code with a particular filename.
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This can be useful, for example, when making a text editor plugin that passes in code directly but needs to still use the configuration's `ignoreFiles` functionality to possibly ignore that code.
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### `config`
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A [stylelint configuration object](configuration.md).
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If no `config` or `configFile` is passed, stylelint will look for a `.stylelintrc` configuration file.
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### `configBasedir`
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An absolute path to the directory that relative paths defining `extends` and `plugins` are *relative to*.
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If the `config` object passed uses relative paths, e.g. for `extends` or `plugins`, you are going to have to pass a `configBasedir`. If not, you do not need this.
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### `configFile`
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The path to a JSON, YAML, or JS file that contains your [stylelint configuration object](configuration.md).
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It should be either absolute or relative to the directory that your process is running from (`process.cwd()`). We'd recommend absolute.
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### `configOverrides`
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A partial stylelint configuration object whose properties will override the existing config object, whether that config was loaded via the `config` option or a `.stylelintrc` file.
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The difference between the `configOverrides` and `config` options is this: If any `config` object is passed, stylelint does not bother looking for a `.stylelintrc` file and instead just uses whatever `config` object you've passed; but if you want to *both* load a `.stylelintrc` file *and* override specific parts of it, `configOverrides` does just that.
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### `files`
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A file glob, or array of file globs. Ultimately passed to [node-glob](https://github.com/isaacs/node-glob) to figure out what files you want to lint.
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Relative globs are considered relative to `process.cwd()`.
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`node_modules` and `bower_components` are always ignored.
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### `formatter`
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Options: `"json"|"string"|"verbose"`, or a function. Default is `"json"`.
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Specify the formatter that you would like to use to format your results.
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If you pass a function, it must fit the signature described in the [Developer Guide](../developer-guide/formatters.md).
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### `ignoreDisables`
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If `true`, all disable comments (e.g. `/* stylelint-disable block-no-empty */`) will be ignored.
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You can use this option to see what your linting results would be like without those exceptions.
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### `reportNeedlessDisables`
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If `true`, `ignoreDisables` will also be set to `true` and the returned data will contain a `needlessDisables` property, whose value is an array of objects, one for each source, with tells you which stylelint-disable comments are not blocking a lint warning.
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Use this report to clean up your codebase, keeping only the stylelint-disable comments that serve a purpose.
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*The recommended way to use this option is through the CLI.* It will output a clean report to the console.
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### `ignorePath`
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A path to a file containing patterns describing files to ignore. The path can be absolute or relative to `process.cwd()`. By default, stylelint looks for `.stylelintignore` in `process.cwd()`. See [Configuration](configuration.md#stylelintignore).
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### `syntax`
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Options: `"scss"|"less"|"sugarss"`
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Specify a non-standard syntax that should be used to parse source stylesheets.
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If you do not specify a syntax, non-standard syntaxes will be automatically inferred by the file extensions `.scss`, `.less`, and `.sss`.
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See the [`customSyntax`](#customsyntax) option below if you would like to use stylelint with a custom syntax.
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### `customSyntax`
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An absolute path to a custom [PostCSS-compatible syntax](https://github.com/postcss/postcss#syntaxes) module.
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Note, however, that stylelint can provide no guarantee that core rules will work with syntaxes other than the defaults listed for the `syntax` option above.
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## The returned promise
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`stylelint.lint()` returns a Promise that resolves with an object containing the following properties:
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### `errored`
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Boolean. If `true`, at least one rule with an "error"-level severity registered a warning.
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### `output`
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A string displaying the formatted warnings (using the default formatter or whichever you passed).
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### `postcssResults`
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An array containing all the [PostCSS LazyResults](https://github.com/postcss/postcss/blob/master/docs/api.md#lazyresult-class) that were accumulated during processing.
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### `results`
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An array containing all the stylelint result objects (the objects that formatters consume).
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## Syntax errors
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`stylelint.lint()` does not reject the Promise when your CSS contains syntax errors.
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It resolves with an object (see [The returned promise](#the-returned-promise)) that contains information about the syntax error.
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## Usage examples
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If `myConfig` contains no relative paths for `extends` or `plugins`, you do not have to use `configBasedir`:
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```js
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stylelint.lint({
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config: myConfig,
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files: "all/my/stylesheets/*.css"
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})
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.then(function(data) {
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// do things with data.output, data.errored,
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// and data.results
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})
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.catch(function(err) {
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// do things with err e.g.
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console.error(err.stack);
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});;
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```
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If `myConfig` *does* contain relative paths for `extends` or `plugins`, you *do* have to use `configBasedir`:
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```js
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stylelint.lint({
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config: myConfig,
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configBasedir: path.join(__dirname, "configs"),
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files: "all/my/stylesheets/*.css"
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}).then(function() { .. });
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```
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Maybe you want to use a CSS string instead of a file glob, and you want to use the string formatter instead of the default JSON:
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```js
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stylelint.lint({
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code: "a { color: pink; }",
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config: myConfig,
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formatter: "string"
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}).then(function() { .. });
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```
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Maybe you want to use my own custom formatter function and parse `.scss` source files:
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```js
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stylelint.lint({
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config: myConfig,
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files: "all/my/stylesheets/*.scss",
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formatter: function(stylelintResults) { .. },
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syntax: "scss"
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}).then(function() { .. });
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```
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The same pattern can be used to read Less or [SugarSS](https://github.com/postcss/sugarss) syntax.
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