Generate Bunfig.toml by using scope and token from .npmrc

generateBunfig.ts

#!/usr/bin/env bun

import Bun from 'bun';

/**
 * Main function
 * @return {Promise<void>} nothing
 */
async function main() {
  // open and read inFile
  const inFile = Bun.file('.npmrc');
  const inData = await inFile.text();

  // find all registries
  const registries = [...inData.matchAll(/(@[^:]+):registry=(\S+)/g)];

  let scopeData = '[install.scopes]\n';

  // for each registry, find authToken and write in TOML format
  for (const registry of registries) {
    const scope = registry[1];
    const url = registry[2];

    const tokenRegex = new RegExp(
      `/${scope.replace('@', '')}/:_authToken=['"]?(\\S+)['"]?`
    );
    const usernameRegex = new RegExp(
      `/${scope.replace('@', '')}/:username=['"]?(\\S+)['"]?`
    );
    const passwordRegex = new RegExp(
      `/${scope.replace('@', '')}/:_password=['"]?(\\S+)['"]?`
    );

    const token = inData.match(tokenRegex);
    const username = inData.match(usernameRegex);
    const password = inData
      .match(passwordRegex)
      ?.map(p => p.replaceAll(/["']/g, ''));

    if (token) {
      // authToken found
      scopeData += `"${scope}" = { url = "${url}", token = "${token[1]}" }\n`;
    } else if (!!username && !!password) {
      // username & password found
      if (password[1].startsWith('ZX')) {
        // if double-encoded, decode once
        password[1] = atob(password[1]);
      }
      scopeData += `"${scope}" = { url = "${url}", username = "${username[1]}", password = "${password[1]}" }\n`;
    } else {
      // no authToken found
      scopeData += `"${scope}" = "${url}"\n`;
    }
  }

  // open outFile
  const outFile = Bun.file('bunfig.toml');
  await Bun.write(outFile, scopeData);
}

main();