/
getPostcssResult.js
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/
getPostcssResult.js
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'use strict';
const LazyResult = require('postcss/lib/lazy-result').default;
const path = require('path');
const { default: postcss } = require('postcss');
const { promises: fs } = require('fs');
/** @typedef {import('postcss').Result} Result */
/** @typedef {import('postcss').Syntax} Syntax */
/** @typedef {import('stylelint').CustomSyntax} CustomSyntax */
/** @typedef {import('stylelint').GetPostcssOptions} GetPostcssOptions */
/** @typedef {import('stylelint').InternalApi} StylelintInternalApi */
const postcssProcessor = postcss();
/**
* @param {StylelintInternalApi} stylelint
* @param {GetPostcssOptions} options
*
* @returns {Promise<Result>}
*/
module.exports = async function getPostcssResult(stylelint, options = {}) {
const cached = options.filePath ? stylelint._postcssResultCache.get(options.filePath) : undefined;
if (cached) {
return cached;
}
if (stylelint._options.syntax) {
return Promise.reject(
new Error(
'The "syntax" (--syntax) option has been removed. Install the appropriate syntax and use the "customSyntax" (--custom-syntax) option instead',
),
);
}
const syntax = options.customSyntax
? getCustomSyntax(options.customSyntax)
: cssSyntax(stylelint, options.filePath);
const postcssOptions = {
from: options.filePath,
syntax,
};
/** @type {string | undefined} */
let getCode;
if (options.code !== undefined) {
getCode = options.code;
} else if (options.filePath) {
getCode = await fs.readFile(options.filePath, 'utf8');
}
if (getCode === undefined) {
return Promise.reject(new Error('code or filePath required'));
}
if (options.codeProcessors && options.codeProcessors.length) {
if (stylelint._options.fix) {
console.warn(
'Autofix is incompatible with processors and will be disabled. Are you sure you need a processor?',
);
stylelint._options.fix = false;
}
const sourceName = options.code ? options.codeFilename : options.filePath;
options.codeProcessors.forEach((codeProcessor) => {
getCode = codeProcessor(getCode, sourceName);
});
}
const postcssResult = await new LazyResult(postcssProcessor, getCode, postcssOptions);
if (options.filePath) {
stylelint._postcssResultCache.set(options.filePath, postcssResult);
}
return postcssResult;
};
/**
* @param {CustomSyntax} customSyntax
* @returns {Syntax}
*/
function getCustomSyntax(customSyntax) {
let resolved;
if (typeof customSyntax === 'string') {
try {
resolved = require(customSyntax);
} catch {
throw new Error(
`Cannot resolve custom syntax module ${customSyntax}. Check that module ${customSyntax} is available and spelled correctly.`,
);
}
/*
* PostCSS allows for syntaxes that only contain a parser, however,
* it then expects the syntax to be set as the `parse` option.
*/
if (!resolved.parse) {
resolved = {
parse: resolved,
stringify: postcss.stringify,
};
}
return resolved;
}
if (typeof customSyntax === 'object') {
if (typeof customSyntax.parse === 'function') {
resolved = { ...customSyntax };
} else {
throw new TypeError(
`An object provided to the "customSyntax" option must have a "parse" property. Ensure the "parse" property exists and its value is a function.`,
);
}
return resolved;
}
throw new Error(`Custom syntax must be a string or a Syntax object`);
}
/**
* @param {StylelintInternalApi} stylelint
* @param {string|undefined} filePath
* @returns {Syntax}
*/
function cssSyntax(stylelint, filePath) {
let fileExtension = '';
if (filePath) {
fileExtension = path
.extname(filePath || '')
.slice(1)
.toLowerCase();
}
const extensions = ['css', 'pcss', 'postcss'];
return {
parse:
stylelint._options.fix && extensions.includes(fileExtension)
? require('postcss-safe-parser')
: postcss.parse,
stringify: postcss.stringify,
};
}