gatsby-plugin-preload-fonts/prepare/cache.js

Gatsby plugin for preloading fonts per page

"use strict";

const fs = require(`fs-extra`);
const path = require(`path`);
function createEmptyCache() {
  return {
    timestamp: Date.now(),
    hash: `initial-run`,
    assets: {}
  };
}
const cacheDir = process.cwd();
const cacheFile = path.join(cacheDir, `font-preload-cache.json`);
let cache;
function load() {
  if (cache) return cache;
  try {
    const json = fs.readFileSync(cacheFile, `utf-8`);
    cache = JSON.parse(json);
    return cache;
  } catch (err) {
    return createEmptyCache();
  }
}
function save(data) {
  try {
    const json = JSON.stringify(data);
    fs.writeFileSync(cacheFile, json, `utf-8`);
    cache = data;
  } catch (e) {
    console.log(`could not write to cache directory, please make sure the following path exists and is writable`);
    console.log(`  ${cacheDir}`);
    console.error(e);
    process.exit(1);
  }
}
module.exports.load = load;
module.exports.save = save;
module.exports.cacheFile = cacheFile;