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decorators.js
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decorators.js
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/**
* @typedef {(
* target: any,
* propertyKey: string|symbol,
* descriptor: PropertyDescriptor
* ) => PropertyDescriptor|undefined} MethodDecorator
*/
/**
* Simplified version of TypeScript's __decorate function.
*
* @param {MethodDecorator[]} decorators List of decorators, possibly returned
* from factories.
* @param {any} target Object being decorated.
* @param {string|symbol} key Method name.
* @returns {PropertyDescriptor} Current property.
*/
export function decorateMethod(decorators, target, key) {
let r = Object.getOwnPropertyDescriptor(target, key);
for (const d of decorators) {
r = d(target, key, r) ?? r;
}
Object.defineProperty(target, key, r);
return r;
}
/**
* What the frequency, Kenneth?
*
* @param {number} fq How often this generator should be chosen.
* @returns {MethodDecorator} Actual decorator.
*/
export function freq(fq) {
return (
/**
* Frequency decorator.
*
* @param {any} target Target object.
* @param {string|symbol} key Method name.
* @param {PropertyDescriptor} _desc Property description.
* @returns {undefined}
*/
(target, key, _desc) => {
target[key].freq = fq;
});
}
/**
* Boxed decorator.
*
* @param {any} target Target object.
* @param {string|symbol} key Method name.
* @param {PropertyDescriptor} _desc Property description.
* @returns {undefined}
*/
export function boxed(target, key, _desc) {
target[key].boxed = true;
}
/**
* Decorator for jsonUnsafe.
*
* @param {any} target Target object.
* @param {string|symbol} key Method name.
* @param {PropertyDescriptor} _desc Property description.
* @returns {undefined}
*/
export function jsonUnsafe(target, key, _desc) {
target[key].jsonUnsafe = true;
}
/**
* Decorator for cborUnsafe.
*
* @param {any} target Target object.
* @param {string|symbol} key Method name.
* @param {PropertyDescriptor} _desc Property description.
* @returns {undefined}
*/
export function cborUnsafe(target, key, _desc) {
target[key].cborUnsafe = true;
}
/**
* Decorator for generators that can be used as weak keys.
*
* @param {any} target Target object.
* @param {string|symbol} key Method name.
* @param {PropertyDescriptor} _desc Property description.
* @returns {undefined}
*/
export function weak(target, key, _desc) {
target[key].weak = true;
}