@beesley/ts-env/src/boolean.ts

An environment variable reader for TypeScript

export default function boolean(key: string) {
  switch (process.env[key]) {
    case 'true':
    case '1': {
      return true;
    }

    case 'false':
    case '0': {
      return false;
    }

    default: {
      return undefined;
    }
  }
}