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export class BError extends Error {  private firstStack: string | undefined = undefined
  /**   * @param msg - A description of the error   * @param cause - If you are inside a `catch` block you can pass the caught error here   * @param metadata - An object containing any data that could be useful for debugging   */  constructor(    msg: string,    cause?: Error,    public metadata?: Record<string, unknown>  ) {    super(msg)    // Workaround for https://github.com/Microsoft/TypeScript/wiki/Breaking-Changes#extending-built-ins-like-error-array-and-map-may-no-longer-work    Object.setPrototypeOf(this, BError.prototype)
    if (cause != undefined) {      const subMessage = cause instanceof Error        ? cause.message        : `non-error object thrown: ${JSON.stringify(cause)}`      this.message = `${this.message}: ${subMessage}`
      if (!this.firstStack) {        this.firstStack = cause.stack      }    }
    this.stack = this.firstStack
    this.metadata = {      ...(cause instanceof BError ? cause.metadata : {}),      ...metadata    };  }
  public log(...args: unknown[]) {    const noMetadata = !this.metadata || Object.entries(this.metadata).length === 0
    if (noMetadata) {      console.error(this.message)    } else {      console.error(this.message, this.metadata)    }  }}