/**
 * Custom error type for scripting engine error results.
 */
class FMPromiseError extends Error {
	private readonly code: number | undefined;

	constructor(obj: { message?: string, code?: number }) {
		super();
		Object.assign(this, obj);
		this.message = obj.message || 'Unknown error';
		this.code = obj.code;
		this.name = this.constructor.name;
	}

	toString(): string {
		return this.message + (this.code ? ' (' + this.code + ')' : '');
	}
}