trycatch-lib

⚡️ trycatch-lib

Simple, type-safe error handling for TypeScript.

📦 Install

pnpm add trycatch-lib
# or
yarn add trycatch-lib
# or
npm install trycatch-lib

🚀 Quick Example: API Call

❌ Traditional try/catch

async function fetchUser(id: string) {
  try {
    const res = await fetch(`/api/user/${id}`);
    const data = await res.json();
    return data;
  } catch (err) {
    return null; // Error details lost
  }
}

✅ With trycatch-lib

import { trycatch } from "trycatch-lib";

async function fetchUser(id: string) {
  // For built-in functions like fetch, pass directly
  const [res, fetchErr] = await trycatch(fetch(`/api/user/${id}`));
  if (fetchErr) return null;

  // For custom logic, use an arrow/anonymous function is what i recommend
  const [data, jsonErr] = await trycatch(() => {
    // your custom logic
  });
  if (jsonErr) return null;

  return data;
}

✨ Features

• 🧩 [result, error] tuple for all functions
• 🔄 Works with sync & async (Promise) functions
• 🧠 Fully type-safe, no any required
• 🔍 Rich error info via TryCatchError
• 🚀 Minimal, zero-config API

📝 Usage

// For built-in or pre-made functions, pass directly: ( way i recommend)
const [result, error] = await trycatch(fetch(url));

// For custom logic, use an arrow/anonymous function i reccomend, it prevents you to make a additional wrappers
const [result, error] = await trycatch(() => {
  // function body
});

if (error) {
  // error is always a TryCatchError instance:
  console.error(error.message);
}

• Use arrow/anonymous functions for custom logic.
• Pass built-in or pre-made functions (like fetch, JSON.parse) directly.
• Handles both sync and async functions.

📚 API

• trycatch(fn) → Returns an async function that returns [result, error].
• TryCatchError → Custom error with .originalError and .timestamp.

🛑 TryCatchError – Error Handling Made Consistent

All errors returned by trycatch are wrapped in a TryCatchError instance for consistent, type-safe error handling.

What is TryCatchError?

A custom error class (see src/errors/TryCatchError.ts) that standardizes error information, making it easy to inspect, log, or handle errors in a predictable way.

Properties

• message: string – Human-readable error message (from the original error, or a default fallback)
• originalError: unknown – The original error value (can be any type: Error, string, object, etc.)
• timestamp: number – When the error was created (milliseconds since epoch)

Usage Example

import { trycatch, TryCatchError } from "trycatch-lib";

const [result, error] = await trycatch(() => {
  // function logic which can throw error
  return; // fn return type
});

if (error) {
  // Always a TryCatchError instance
  console.error("Message:", error.message);
  console.error("Original error:", error.originalError);
  console.log("Occurred at:", new Date(error.timestamp));

  // How to use it as Type guard
  if (error instanceof TryCatchError) {
    // ...handle specifically
  }
}

Best Practices

• Use .originalError if you need the raw error (for logging, rethrowing, etc.)
• .message is always a string, even if the original error was not
• .timestamp helps with debugging and tracing error events

🧪 Test

pnpm test

📄 License

MIT