@ngrx/effects
Version:
Side effect model for @ngrx/store
46 lines • 6.1 kB
JavaScript
import { compose } from '@ngrx/store';
import { DEFAULT_EFFECT_CONFIG, } from './models';
import { getSourceForInstance } from './utils';
const METADATA_KEY = '__@ngrx/effects__';
/**
* @deprecated The Effect decorator (`@Effect`) is deprecated in favor for the `createEffect` method.
* See the docs for more info {@link https://ngrx.io/guide/migration/v11#the-effect-decorator}
*/
export function Effect(config = {}) {
return function (target, propertyName) {
const metadata = {
...DEFAULT_EFFECT_CONFIG,
...config,
propertyName,
};
addEffectMetadataEntry(target, metadata);
};
}
export function getEffectDecoratorMetadata(instance) {
const effectsDecorators = compose(getEffectMetadataEntries, getSourceForInstance)(instance);
return effectsDecorators;
}
/**
* Type guard to detemine whether METADATA_KEY is already present on the Class
* constructor
*/
function hasMetadataEntries(sourceProto) {
return sourceProto.constructor.hasOwnProperty(METADATA_KEY);
}
/** Add Effect Metadata to the Effect Class constructor under specific key */
function addEffectMetadataEntry(sourceProto, metadata) {
if (hasMetadataEntries(sourceProto)) {
sourceProto.constructor[METADATA_KEY].push(metadata);
}
else {
Object.defineProperty(sourceProto.constructor, METADATA_KEY, {
value: [metadata],
});
}
}
function getEffectMetadataEntries(sourceProto) {
return hasMetadataEntries(sourceProto)
? sourceProto.constructor[METADATA_KEY]
: [];
}
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