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decorators.ts
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/
decorators.ts
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// @Component
// @Selector
// @useState
// Factory
// function Logger(prefix: string) {
// return (target) => {
// console.log(`${prefix} - ${target}`);
// };
// }
// @Logger("awesome")
// class Foo {}
// Class decorator
function setAPIVersion(apiVersion: string) {
return (constructor: any) => {
return class extends constructor {
version = apiVersion;
};
};
}
@setAPIVersion("1.0.0")
class API {}
console.log(new API());
// Property decorator
// function minLength(len: number) {
// return (target: any, key: string) => {
// let val = target[key];
// const getter = () => val;
// const setter = (value: string) => {
// if (value.length < len) {
// console.log(`Error: você não pode criar ${key} menor que ${len}`);
// } else {
// val = value;
// }
// };
// Object.defineProperty(target, key, {
// get: getter,
// set: setter,
// });
// };
// }
// class Movie {
// // validação - se for menor que 5 - error
// @minLength(50)
// title: string;
// constructor(t: string) {
// this.title = t;
// }
// }
// const movie = new Movie("Interstellar");
// console.log(movie.title);
// Method decorator
function delay(ms: number) {
return (target: any, key: string, descriptor: PropertyDescriptor) => {
const originalMethod = descriptor.value;
descriptor.value = function (...args: any) {
console.log(`waiting ${ms}...`);
setTimeout(() => {
originalMethod.apply(this, args);
}, ms);
};
return descriptor;
};
}
class Greeter {
greeting: string;
constructor(g: string) {
this.greeting = g;
}
@delay(1000)
greet() {
console.log(`Hello! ${this.greeting}`);
}
}
const pessoinha = new Greeter("pessoinha");
pessoinha.greet();
// Parameter decorator
// Accessor decorator