@trademe/ensure
Version:
49 lines (48 loc) • 5.83 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes} checked by tsc
*/
// Constants:
const /** @type {?} */ VALUE_KEY = '__value_';
/**
* @param {...?} guards
* @return {?}
*/
export function Value(...guards) {
const /** @type {?} */ guardsArray = getGuardsArray(guards);
const /** @type {?} */ getters = guardsArray.filter(c => c.isGetter);
const /** @type {?} */ setters = guardsArray.filter(c => !c.isGetter);
return (target, propertyKey) => {
Object.defineProperty(target, propertyKey, {
get: function () {
const /** @type {?} */ value = (/** @type {?} */ (Reflect)).getMetadata(`${VALUE_KEY}${propertyKey}`, this);
getters.forEach(getter => {
getter.call(this, value, propertyKey);
});
return value;
},
set: function (value) {
let /** @type {?} */ castValue = value;
if (castValue === 'null') {
castValue = null;
}
if (castValue != null) {
setters.forEach(setter => {
castValue = setter.call(this, castValue, propertyKey);
});
}
(/** @type {?} */ (Reflect)).defineMetadata(`${VALUE_KEY}${propertyKey}`, castValue, this);
}
});
};
}
/**
* @param {?} guards
* @return {?}
*/
function getGuardsArray(guards) {
// Handle old @Value([guardOne, guardTwo]) syntax:
const [firstGuard] = guards;
return Array.isArray(firstGuard) ? /** @type {?} */ (firstGuard) : /** @type {?} */ (guards);
}
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