@marp-team/marpit/lib/postcss/import/rollup.js

The skinny framework for creating slide deck from Markdown

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _postcss = _interopRequireDefault(require("postcss"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

/** @module */

/**
 * Marpit PostCSS import rollup plugin.
 *
 * Rollup `@charset` and `@import` at-rule to the beginning of CSS. Marpit is
 * manipulating CSS with many PostCSS plugins, so sometimes a few at-rules
 * cannot keep specification.
 *
 * This plugin takes care of rolling up invalid at-rules.
 *
 * @alias module:postcss/import/rollup
 */
const plugin = _postcss.default.plugin('marpit-postcss-import-rollup', () => css => {
  const rolluped = {
    charset: undefined,
    imports: []
  };
  css.walkAtRules(rule => {
    if (rule.name === 'charset') {
      rule.remove();
      if (!rolluped.charset) rolluped.charset = rule;
    } else if (rule.name === 'import') {
      rolluped.imports.push(rule.remove());
    }
  });
  const {
    first
  } = css // Rollup at-rules
  ;
  [rolluped.charset, ...rolluped.imports].filter(r => r).forEach((rule, idx) => {
    // Strip whitespace from the beginning of first at-rule
    const prependRule = idx === 0 ? rule.clone({
      raws: {
        before: undefined
      }
    }) : rule;
    first.before(prependRule);
  });
});

var _default = plugin;
exports.default = _default;