gatsby-plugin-prefetch-google-fonts/gatsby-node.js

A Gatsby plugin to download and prefetch [Google Fonts](https://fonts.google.com/). Can increase performance as opposed to loading webfonts from Google's external stylesheet.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

var _regenerator = _interopRequireDefault(require("@babel/runtime/regenerator"));

var _asyncToGenerator2 = _interopRequireDefault(require("@babel/runtime/helpers/asyncToGenerator"));

var _require = require("fs-extra"),
    pathExists = _require.pathExists,
    readFile = _require.readFile,
    outputFile = _require.outputFile,
    remove = _require.remove,
    copy = _require.copy;

var Hash = require("object-hash");

var downloadCSS = require("./download-css");

var mergeCSS = require("./merge-css");

var downloadFonts = require("./download-fonts");

var path = require("path");

exports.onPreBootstrap =
/*#__PURE__*/
function () {
  var _ref = (0, _asyncToGenerator2.default)(
  /*#__PURE__*/
  _regenerator.default.mark(function _callee(config, options) {
    var cachedPath, hashPath, hash;
    return _regenerator.default.wrap(function _callee$(_context) {
      while (1) {
        switch (_context.prev = _context.next) {
          case 0:
            cachedPath = path.join("./.cache/google-fonts/", config.pathPrefix);
            hashPath = path.join(cachedPath, "hash.txt");
            hash = Hash(options);
            _context.next = 5;
            return pathExists(hashPath);

          case 5:
            _context.t0 = !_context.sent;

            if (_context.t0) {
              _context.next = 12;
              break;
            }

            _context.next = 9;
            return readFile(hashPath, "utf8");

          case 9:
            _context.t1 = _context.sent;
            _context.t2 = hash;
            _context.t0 = _context.t1 !== _context.t2;

          case 12:
            if (!_context.t0) {
              _context.next = 23;
              break;
            }

            _context.next = 15;
            return remove("./.cache/google-fonts");

          case 15:
            _context.next = 17;
            return downloadCSS(options, config);

          case 17:
            _context.next = 19;
            return mergeCSS(config);

          case 19:
            _context.next = 21;
            return downloadFonts(config);

          case 21:
            _context.next = 23;
            return outputFile(hashPath, hash);

          case 23:
            _context.next = 25;
            return copy("".concat(cachedPath, "/fonts"), "./public/google-fonts");

          case 25:
          case "end":
            return _context.stop();
        }
      }
    }, _callee, this);
  }));

  return function (_x, _x2) {
    return _ref.apply(this, arguments);
  };
}();