API Reference

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API Reference / @dasch-ng/decorators

@dasch-ng/decorators

A collection of useful TypeScript decorators for enhancing your Angular and TypeScript applications with logging, performance measurement, memoization, and reactive property observation.

Installation

npm install @dasch-ng/decorators

or with bun:

bun add @dasch-ng/decorators

Features

• 📝 @logGroup - Group console logs for method execution
• ⏱️ @measure - Measure method execution time
• 💾 @memoize - Cache method results for performance optimization
• 🔄 @Observe - Create reactive Observable streams from property changes
• 🚀 Async Support - All decorators work with both sync and async methods

Quick Start

import { logGroup, measure, memoize, Observe } from '@dasch-ng/decorators';
import { Observable } from 'rxjs';

class ExampleService {
  // Measure execution time
  @measure
  processData(data: any[]) {
    return data.map((item) => item * 2);
  }

  // Cache expensive calculations
  @memoize()
  fibonacci(n: number): number {
    if (n <= 1) return n;
    return this.fibonacci(n - 1) + this.fibonacci(n - 2);
  }

  // Group console logs
  @logGroup
  async fetchUser(id: string) {
    console.log('Fetching user...');
    return { id, name: 'John Doe' };
  }
}

// Create Observable from property changes
@Component({
  selector: 'user-profile',
  template: '<div>{{ userId$ | async }}</div>',
})
export class UserProfileComponent {
  @Input() userId: number;
  @Observe('userId') userId$: Observable<number>;
}

Documentation

For full documentation, examples, and API reference, visit dasch.ng/libraries/decorators

Source & Credits

This library is inspired by helpful-decorators by Netanel Basal.

Development

Building

nx build decorators

Running Tests

nx test decorators

License

MIT

Functions

• isAsyncFunction
• logGroup
• measure
• memoize
• Observe