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Rust-Style Error Handling for TypeScript

This library aims to provide a robust, type-safe error handling system for TypeScript that closely mirrors Rust's error handling patterns. The goal is to make error handling more explicit and help developers write more reliable code by forcing them to handle potential errors at compile time.

Core Features

1. Result Type

  • Generic Result<T, E> type representing either success (Ok<T>) or failure (Err<E>)
  • Type-safe error handling with compile-time checks
  • No runtime overhead compared to traditional try/catch
  • Full TypeScript type inference support

2. Core Functions

  • Ok<T, E>(value: T) - Create a successful result
  • Err<T, E>(error: E) - Create an error result
  • unwrap<T, E>(result: Result<T, E>) - Get value or panic
  • expect<T, E>(result: Result<T, E>, message: string) - Get value or panic with message
  • match<T, E, U>(result: Result<T, E>, onOk: (value: T) => U, onErr: (error: E) => U) - Pattern matching
  • map<T, E, U>(result: Result<T, E>, fn: (value: T) => U) - Transform success value
  • mapErr<T, E, F>(result: Result<T, E>, fn: (error: E) => F) - Transform error value
  • andThen<T, E, U>(result: Result<T, E>, fn: (value: T) => Result<U, E>) - Chain operations

3. Async Support

  • ResultAsync<T, E> type alias for Promise<Result<T, E>>
  • Async versions of core functions:
    • andThenAsync
    • mapAsync
    • mapErrAsync
  • Utility functions for working with promises:
    • toResult - Convert Promise to Result
    • fromResult - Convert Result to Promise

4. Error Types

  • Base error interface for standardization
  • Common error types:
    • ParseError
    • ValidationError
    • NetworkError
    • IoError
  • Error type composition utilities

5. Validation Types

  • Support for custom validation types (like Rust's Guess)
  • Type-safe validation with compile-time checks
  • Common validation types:
    • NonEmptyString
    • PositiveNumber
    • EmailAddress
    • Url

6. Panic System

  • panic(message: string) function for unrecoverable errors
  • Custom panic handler support
  • Stack trace preservation
  • Development vs production modes

Implementation Plan

Phase 1: Core Implementation

  1. Set up project structure and build system
  2. Implement core Result type and basic functions
  3. Add type tests and runtime tests
  4. Create basic documentation

Phase 2: Advanced Features

  1. Implement async support
  2. Add error type system
  3. Create validation type system
  4. Implement panic system
  5. Add comprehensive tests

Phase 3: Documentation & Examples

  1. Write comprehensive API documentation
  2. Create usage examples
  3. Add best practices guide
  4. Create migration guide from try/catch

Phase 4: Tooling & Integration

  1. Add TypeScript compiler plugin for better type inference
  2. Create ESLint rules for enforcing patterns
  3. Add VS Code extension for better DX
  4. Create integration examples with popular frameworks

Project Structure

rust-errors/
├── src/
│   ├── core/
│   │   ├── result.ts
│   │   ├── panic.ts
│   │   └── types.ts
│   ├── async/
│   │   ├── result-async.ts
│   │   └── utils.ts
│   ├── errors/
│   │   ├── base.ts
│   │   └── common.ts
│   ├── validation/
│   │   ├── types.ts
│   │   └── common.ts
│   └── index.ts
├── tests/
│   ├── core/
│   ├── async/
│   ├── errors/
│   └── validation/
├── examples/
│   ├── basic/
│   ├── async/
│   └── validation/
├── docs/
│   ├── api/
│   ├── guides/
│   └── best-practices/
├── package.json
├── tsconfig.json
├── .eslintrc.js
└── README.md

Development Guidelines

  1. Type Safety

    • Use strict TypeScript settings
    • No any types except in specific utility functions
    • Comprehensive type tests

  2. Performance

    • No unnecessary runtime overhead
    • Minimal dependencies
    • Efficient memory usage

  3. API Design

    • Consistent with Rust patterns
    • Intuitive TypeScript/JavaScript usage
    • Clear error messages

  4. Documentation

    • Comprehensive JSDoc comments
    • Clear examples for each feature
    • Best practices and anti-patterns

  5. Testing

    • 100% test coverage
    • Property-based testing
    • Performance benchmarks

Next Steps

  1. Create initial project structure
  2. Implement core Result type
  3. Add basic utility functions
  4. Create first set of tests
  5. Write initial documentation