const symbolError = Symbol.for('NextjsError') export function getErrorSource(error: Error): 'server' | 'edge-server' | null { return (error as any)[symbolError] || null } export type ErrorSourceType = 'edge-server' | 'server' export function decorateServerError(error: Error, type: ErrorSourceType) { Object.defineProperty(error, symbolError, { writable: false, enumerable: false, configurable: false, value: type, }) }