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* Error Classifier - Categorize errors for user-friendly messaging
*
* Provides error classification to map technical errors to user-friendly
* messages with recovery suggestions.
*/
export enum ErrorType {
NETWORK = 'network',
VALIDATION = 'validation',
AUTHENTICATION = 'authentication',
AUTHORIZATION = 'authorization',
NOT_FOUND = 'not_found',
SERVER = 'server',
PAYMENT = 'payment',
RATE_LIMIT = 'rate_limit',
UNKNOWN = 'unknown',
}
export interface ClassifiedError {
type: ErrorType;
isRetryable: boolean;
userMessage: string;
technicalMessage: string;
suggestedAction: string;
httpStatus?: number;
}
/**
* Classify an error into a user-friendly category
*
* @example
* ```tsx
* const classified = classifyError(error);
* console.log(classified.userMessage);
* // "Unable to connect to the server"
* ```
*/
export function classifyError(error: Error | Response | unknown): ClassifiedError {
// Network errors (fetch failures, timeouts, etc.)
if (error instanceof TypeError && error.message.includes('fetch')) {
return {
type: ErrorType.NETWORK,
isRetryable: true,
userMessage: 'Unable to connect to the server',
technicalMessage: error.message,
suggestedAction: 'Check your internet connection and try again',
};
}
// Offline detection
if (
typeof navigator !== 'undefined' &&
!navigator.onLine
) {
return {
type: ErrorType.NETWORK,
isRetryable: true,
userMessage: 'You appear to be offline',
technicalMessage: 'No network connection detected',
suggestedAction: 'Check your internet connection and try again',
};
}
// Response errors (HTTP status codes)
if (error instanceof Response || hasStatus(error)) {
const status = (error as { status: number }).status;
return classifyHttpStatus(status, error);
}
// Payment-related errors
if (error instanceof Error && isPaymentError(error.message)) {
return {
type: ErrorType.PAYMENT,
isRetryable: true,
userMessage: 'Payment could not be processed',
technicalMessage: error.message,
suggestedAction: 'Check your payment details and try again',
};
}
// Validation errors
if (error instanceof Error && isValidationError(error.message)) {
return {
type: ErrorType.VALIDATION,
isRetryable: false,
userMessage: 'Invalid information provided',
technicalMessage: error.message,
suggestedAction: 'Please check your input and try again',
};
}
// Auth-related errors
if (error instanceof Error && isAuthError(error.message)) {
return {
type: ErrorType.AUTHENTICATION,
isRetryable: false,
userMessage: 'Please sign in to continue',
technicalMessage: error.message,
suggestedAction: 'Sign in to your account',
};
}
// Default unknown error
return {
type: ErrorType.UNKNOWN,
isRetryable: true,
userMessage: 'Something went wrong',
technicalMessage: error instanceof Error ? error.message : 'Unknown error',
suggestedAction: 'Please try again. If the problem persists, contact support.',
};
}
/**
* Classify an HTTP status code
*/
function classifyHttpStatus(
status: number,
error: unknown
): ClassifiedError {
switch (status) {
case 400:
return {
type: ErrorType.VALIDATION,
isRetryable: false,
userMessage: 'Invalid request',
technicalMessage: 'Bad Request',
suggestedAction: 'Please check your input and try again',
httpStatus: 400,
};
case 401:
return {
type: ErrorType.AUTHENTICATION,
isRetryable: false,
userMessage: 'Please sign in to continue',
technicalMessage: 'Unauthorized',
suggestedAction: 'Sign in to your account',
httpStatus: 401,
};
case 403:
return {
type: ErrorType.AUTHORIZATION,
isRetryable: false,
userMessage: "You don't have permission to access this",
technicalMessage: 'Forbidden',
suggestedAction: 'Contact support if you believe this is an error',
httpStatus: 403,
};
case 404:
return {
type: ErrorType.NOT_FOUND,
isRetryable: false,
userMessage: 'The requested item was not found',
technicalMessage: 'Not Found',
suggestedAction: 'Check the URL or go back to the previous page',
httpStatus: 404,
};
case 429:
return {
type: ErrorType.RATE_LIMIT,
isRetryable: true,
userMessage: 'Too many requests',
technicalMessage: 'Rate Limited',
suggestedAction: 'Please wait a moment and try again',
httpStatus: 429,
};
case 500:
case 502:
case 503:
case 504:
return {
type: ErrorType.SERVER,
isRetryable: true,
userMessage: 'Our servers are having issues',
technicalMessage: `Server Error (${status})`,
suggestedAction: 'Please try again in a few moments',
httpStatus: status,
};
default:
return {
type: ErrorType.UNKNOWN,
isRetryable: status >= 500,
userMessage: 'Something went wrong',
technicalMessage:
error instanceof Error ? error.message : `HTTP Error ${status}`,
suggestedAction: 'Please try again',
httpStatus: status,
};
}
}
// Helper functions for error detection
function hasStatus(error: unknown): error is { status: number } {
return (
error !== null &&
typeof error === 'object' &&
'status' in error &&
typeof (error as { status: unknown }).status === 'number'
);
}
function isPaymentError(message: string): boolean {
const paymentKeywords = [
'payment',
'card',
'stripe',
'transaction',
'charge',
'billing',
'credit',
'debit',
];
const lowerMessage = message.toLowerCase();
return paymentKeywords.some((keyword) => lowerMessage.includes(keyword));
}
function isValidationError(message: string): boolean {
const validationKeywords = [
'validation',
'invalid',
'required',
'must be',
'cannot be',
'format',
];
const lowerMessage = message.toLowerCase();
return validationKeywords.some((keyword) => lowerMessage.includes(keyword));
}
function isAuthError(message: string): boolean {
const authKeywords = [
'unauthorized',
'unauthenticated',
'session expired',
'token expired',
'not authenticated',
'login required',
'sign in',
];
const lowerMessage = message.toLowerCase();
return authKeywords.some((keyword) => lowerMessage.includes(keyword));
}
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