envalid/src/errors.ts

Validation for your environment variables

// Surprisingly involved error subclassing
// See https://stackoverflow.com/questions/41102060/typescript-extending-error-class

export class EnvError extends TypeError {
  constructor(message?: string) {
    super(message)
    Object.setPrototypeOf(this, new.target.prototype)
    Error.captureStackTrace(this, EnvError)
    this.name = this.constructor.name
  }
}

export class EnvMissingError extends ReferenceError {
  constructor(message?: string) {
    super(message)
    Object.setPrototypeOf(this, new.target.prototype)
    Error.captureStackTrace(this, EnvMissingError)
    this.name = this.constructor.name
  }
}