Rename React Native Fonts

renameFonts.js

const fs = require('fs');
const path = require('path');
const opentype = require('opentype.js');

const fontFormats = ['.ttf', '.otf'];
const fontsPath = path.join(__dirname, 'assets', 'fonts');
const filenames = fs.readdirSync(fontsPath);

filenames.forEach(filename => {
  const extension = path.extname(filename);

  if (!fontFormats.includes(extension)) {
    return;
  }

  const fontPath = path.join(fontsPath, filename);
  const font = opentype.loadSync(fontPath);

  const newFilename = font.names.postScriptName.en + extension;
  const newFontPath = path.join(fontsPath, newFilename);

  const relativeFontPath = path.relative(__dirname, fontPath);
  const relativeNewFontPath = path.relative(__dirname, newFontPath);

  if (filename === newFilename) {
    console.log(`${relativeFontPath} is already named correctly.`);
  } else {
    fs.renameSync(fontPath, newFontPath);

    console.log(`Renamed ${relativeFontPath} to ${relativeNewFontPath}.`);
  }
});