@baseplate-dev/create-project/templates/scripts/setup-npmrc.cjs

CLI starter kit for creating a new Baseplate project

/*
 * Generates .npmrc from a .npmrc.template file using a .env file if present
 *
 * This allows us to use .env files to store secrets and use them in .npmrc
 * since it is not natively supported by pnpm.
 */
const fs = require('node:fs');
const path = require('node:path');

module.exports = function generateNpmRc(dirname) {
  const templatePath = path.join(dirname, '.template.npmrc');
  const npmrcPath = path.join(dirname, '.npmrc');
  const envPath = path.join(dirname, '.env');

  if (!fs.existsSync(templatePath)) {
    return;
  }

  // read .env file if present
  const envVars = { ...process.env };
  if (fs.existsSync(envPath)) {
    const env = fs.readFileSync(envPath, 'utf8');
    const lines = env
      .split('\n')
      .filter((line) => line && !line.startsWith('#'));
    for (const line of lines) {
      const [key, ...values] = line.split('=');
      if (values.length > 0) {
        envVars[key] = values.join('=');
      }
    }
  }

  const template = fs.readFileSync(templatePath, 'utf8');

  // replace all ${VARIABLE} with process.env.VARIABLE
  const npmrc = template
    .replaceAll(/\${([A-Z_]+)}/g, (_, key) => {
      if (!envVars[key]) {
        throw new Error(`Missing environment variable ${key}`);
      }
      return envVars[key];
    })
    .replaceAll(/\${([A-Z_:a-z\-]+)}/g, (_, key) =>
      envVars[key] ? envVars[key] : key,
    );

  const npmrcContents = `
# This file has been auto-generated from .npmrc.template
# Do not edit this file directly
# Edit .npmrc.template instead and run \`pnpm install\` to regenerate this file

${npmrc}`.trimStart();

  if (fs.existsSync(npmrcPath)) {
    const existingNpmrc = fs.readFileSync(npmrcPath, 'utf8');

    if (existingNpmrc === npmrcContents) {
      return;
    }
  }

  fs.writeFileSync(npmrcPath, npmrcContents);

  if (!process.argv.includes('--silent')) {
    console.log(`
Generated .npmrc file from .template.npmrc!
      
Please run your command again so it can use the latest .npmrc.
      `);

    process.exit(1);
  }
};