@toss/nestjs-aop ยท 
A way to gracefully apply AOP to nestjs
Use nestjs managed instances in any decorators gracefully
Table of Contents
Installation
npm install @toss/nestjs-aop
pnpm add @toss/nestjs-aop
yarn add @toss/nestjs-aopUsage
1. Import AopModule
@Module({
imports: [
// ...
AopModule,
],
})
export class AppModule {}2. Create symbol for LazyDecorator
export const CACHE_DECORATOR = Symbol('CACHE_DECORATOR');3. Implement LazyDecorator using nestjs provider
metadata is the second parameter of createDecorator.
@Aspect(CACHE_DECORATOR)
export class CacheDecorator implements LazyDecorator<any, CacheOptions> {
constructor(private readonly cache: Cache) {}
wrap({ method, metadata: options }: WrapParams<any, CacheOptions>) {
return (...args: any) => {
let cachedValue = this.cache.get(...args);
if (!cachedValue) {
cachedValue = method(...args);
this.cache.set(cachedValue, ...args);
}
return cachedValue;
};
}
}4. Add LazyDecoratorImpl to providers of module
@Module({
providers: [CacheDecorator],
})
export class CacheModule {}5. Create decorator that marks metadata of LazyDecorator
options can be obtained from the warp method and used.
export const Cache = (options: CacheOptions) => createDecorator(CACHE_DECORATOR, options)6. Use it!
export class SomeService {
@Cache({
// ...options(metadata value)
})
some() {
// ...
}
}References
Contributing
We welcome contribution from everyone in this project. Read CONTRIBUTING.md for detailed contribution guide.
License
MIT ยฉ Viva Republica, Inc. See LICENSE for details.
