ngx-decorate/_bundle/esm5/SubjectSetter.js

Useful decorators for Angular 2 and above

import { ensureSymbol } from './lib/ensureSymbol';
import { HookManager } from './lib/HookManager';
import { _setProp } from './lib/symbols';
import { setProp } from './processors/setProp';
/**
 * Mark the property as a subject setter. When written to, it will call .next(value) on the subject.
 * The decorator's <b>default</b> config option only works on items that make use of the OnInit hook,
 * i.e. it will <b>not</b> work for services and pipes.
 *
 * Because the <b>default</b> config option utilises the OnInit hook, it should not be used on
 * properties that are component inputs as the input would get overridden during the hook.
 *
 * @param subjectPropName Name of the property at which the subject resides
 * @param conf Optional configuration
 */
export function SubjectSetter(subjectPropName, conf) {
    if (conf === void 0) { conf = {}; }
    return function (target, prop) {
        var _a;
        var symbolValue = Symbol("subjectSetter:" + prop.toString());
        var defaultDescriptor = {
            configurable: true,
            enumerable: true
        };
        var defaultValue = conf.default || target[prop];
        if (defaultValue) {
            ensureSymbol(target, _setProp, [])
                .push({ prop: prop, value: defaultValue });
            HookManager.for(target).add(2 /* POST_INIT */, setProp);
        }
        Object.defineProperties(target, (_a = {},
            _a[symbolValue] = {
                configurable: false,
                enumerable: false,
                value: defaultValue,
                writable: true
            },
            _a[prop] = Object.assign(defaultDescriptor, conf.desc || {}, {
                get: function () {
                    return this[symbolValue];
                },
                set: function (v) {
                    this[symbolValue] = v;
                    this[subjectPropName].next(v);
                }
            }),
            _a));
    };
}
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