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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.tailwindExtractor = tailwindExtractor;
exports.default = purgeUnusedUtilities;
var _lodash = _interopRequireDefault(require("lodash"));
var _postcss = _interopRequireDefault(require("postcss"));
var _postcssPurgecss = _interopRequireDefault(require("@fullhuman/postcss-purgecss"));
var _log = _interopRequireDefault(require("../util/log"));
var _htmlTags = _interopRequireDefault(require("html-tags"));
var _path = _interopRequireDefault(require("path"));
var _parseDependency = _interopRequireDefault(require("../util/parseDependency"));
var _normalizePath = _interopRequireDefault(require("normalize-path"));
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function removeTailwindMarkers(css) {
css.walkAtRules('tailwind', rule => rule.remove());
css.walkComments(comment => {
switch (comment.text.trim()) {
case 'tailwind start base':
case 'tailwind end base':
case 'tailwind start components':
case 'tailwind start utilities':
case 'tailwind end components':
case 'tailwind end utilities':
comment.remove();
break;
default:
break;
}
});
}
function tailwindExtractor(content) {
// Capture as liberally as possible, including things like `h-(screen-1.5)`
const broadMatches = content.match(/[^<>"'`\s]*[^<>"'`\s:]/g) || [];
const broadMatchesWithoutTrailingSlash = broadMatches.map(match => _lodash.default.trimEnd(match, '\\')); // Capture classes within other delimiters like .block(class="w-1/2") in Pug
const innerMatches = content.match(/[^<>"'`\s.(){}[\]#=%]*[^<>"'`\s.(){}[\]#=%:]/g) || [];
return broadMatches.concat(broadMatchesWithoutTrailingSlash).concat(innerMatches);
}
function getTransformer(config, fileExtension) {
let transformers = config.purge && config.purge.transform || {};
if (typeof transformers === 'function') {
transformers = {
DEFAULT: transformers
};
}
return transformers[fileExtension] || transformers.DEFAULT || (content => content);
}
function purgeUnusedUtilities(config, configChanged, registerDependency) {
var _config$purge;
const purgeEnabled = _lodash.default.get(config, 'purge.enabled', config.purge !== false && config.purge !== undefined && process.env.NODE_ENV === 'production');
if (!purgeEnabled) {
return removeTailwindMarkers;
} // Skip if `purge: []` since that's part of the default config
if (Array.isArray(config.purge) && config.purge.length === 0) {
if (configChanged) {
_log.default.warn(['Tailwind is not purging unused styles because no template paths have been provided.', 'If you have manually configured PurgeCSS outside of Tailwind or are deliberately not removing unused styles, set `purge: false` in your Tailwind config file to silence this warning.', 'https://tailwindcss.com/docs/controlling-file-size/#removing-unused-css']);
}
return removeTailwindMarkers;
}
const extractors = config.purge.extract || {};
const transformers = config.purge.transform || {};
let {
defaultExtractor: originalDefaultExtractor,
...purgeOptions
} = config.purge.options || {};
if ((_config$purge = config.purge) !== null && _config$purge !== void 0 && _config$purge.safelist && !purgeOptions.hasOwnProperty('safelist')) {
purgeOptions.safelist = config.purge.safelist;
}
if (!originalDefaultExtractor) {
originalDefaultExtractor = typeof extractors === 'function' ? extractors : extractors.DEFAULT || tailwindExtractor;
}
const defaultExtractor = content => {
const preserved = originalDefaultExtractor(content);
if (_lodash.default.get(config, 'purge.preserveHtmlElements', true)) {
preserved.push(..._htmlTags.default);
}
return preserved;
}; // If `extractors` is a function then we don't have any file-specific extractors,
// only a default one.
let fileSpecificExtractors = typeof extractors === 'function' ? {} : extractors; // PurgeCSS doesn't support "transformers," so we implement those using extractors.
// If we have a custom transformer for an extension, but not a matching extractor,
// then we need to create an extractor that we can augment later.
if (typeof transformers !== 'function') {
for (let [extension] of Object.entries(transformers)) {
if (!fileSpecificExtractors[extension]) {
fileSpecificExtractors[extension] = defaultExtractor;
}
}
} // Augment file-specific extractors by running the transformer before we extract classes.
fileSpecificExtractors = Object.entries(fileSpecificExtractors).map(([extension, extractor]) => {
return {
extensions: [extension],
extractor: content => {
const transformer = getTransformer(config, extension);
return extractor(transformer(content));
}
};
});
let content = (Array.isArray(config.purge) ? config.purge : config.purge.content || purgeOptions.content || []).map(item => {
if (typeof item === 'string') {
return (0, _normalizePath.default)(_path.default.resolve(item));
}
return item;
});
for (let fileOrGlob of content.filter(item => typeof item === 'string')) {
registerDependency((0, _parseDependency.default)(fileOrGlob));
}
return (0, _postcss.default)([function (css) {
const mode = _lodash.default.get(config, 'purge.mode', 'layers');
if (!['all', 'layers'].includes(mode)) {
throw new Error('Purge `mode` must be one of `layers` or `all`.');
}
if (mode === 'all') {
return;
}
const layers = _lodash.default.get(config, 'purge.layers', ['base', 'components', 'utilities']);
css.walkComments(comment => {
switch (comment.text.trim()) {
case `purgecss start ignore`:
comment.before(_postcss.default.comment({
text: 'purgecss end ignore'
}));
break;
case `purgecss end ignore`:
comment.before(_postcss.default.comment({
text: 'purgecss end ignore'
}));
comment.text = 'purgecss start ignore';
break;
default:
break;
}
layers.forEach(layer => {
switch (comment.text.trim()) {
case `tailwind start ${layer}`:
comment.text = 'purgecss end ignore';
break;
case `tailwind end ${layer}`:
comment.text = 'purgecss start ignore';
break;
default:
break;
}
});
});
css.prepend(_postcss.default.comment({
text: 'purgecss start ignore'
}));
css.append(_postcss.default.comment({
text: 'purgecss end ignore'
}));
}, removeTailwindMarkers, (0, _postcssPurgecss.default)({
defaultExtractor: content => {
const transformer = getTransformer(config);
return defaultExtractor(transformer(content));
},
extractors: fileSpecificExtractors,
...purgeOptions,
content
})]);
}