83 lines
2.8 KiB
TypeScript
83 lines
2.8 KiB
TypeScript
/**
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* Internal dependencies
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*/
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import { getObserversByPriority } from './utils';
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import type { EventObserversType } from './types';
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/**
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* Emits events on registered observers for the provided type and passes along
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* the provided data.
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*
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* This event emitter will silently catch promise errors, but doesn't care
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* otherwise if any errors are caused by observers. So events that do care
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* should use `emitEventWithAbort` instead.
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*
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* @param {Object} observers The registered observers to omit to.
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* @param {string} eventType The event type being emitted.
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* @param {*} data Data passed along to the observer when it is invoked.
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*
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* @return {Promise} A promise that resolves to true after all observers have executed.
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*/
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export const emitEvent = async (
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observers: EventObserversType,
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eventType: string,
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data: unknown
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): Promise< unknown > => {
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const observersByType = getObserversByPriority( observers, eventType );
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const observerResponses = [];
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for ( const observer of observersByType ) {
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try {
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const observerResponse = await Promise.resolve(
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observer.callback( data )
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);
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if ( typeof observerResponse === 'object' ) {
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observerResponses.push( observerResponse );
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}
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} catch ( e ) {
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// we don't care about errors blocking execution, but will console.error for troubleshooting.
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// eslint-disable-next-line no-console
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console.error( e );
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}
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}
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return observerResponses.length ? observerResponses : true;
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};
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/**
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* Emits events on registered observers for the provided type and passes along
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* the provided data. This event emitter will abort and return any value from
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* observers that return an object which should contain a type property.
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*
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* @param {Object} observers The registered observers to omit to.
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* @param {string} eventType The event type being emitted.
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* @param {*} data Data passed along to the observer when it is invoked.
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*
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* @return {Promise} Returns a promise that resolves to either boolean or the return value of the aborted observer.
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*/
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export const emitEventWithAbort = async (
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observers: EventObserversType,
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eventType: string,
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data: unknown
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): Promise< unknown > => {
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const observersByType = getObserversByPriority( observers, eventType );
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for ( const observer of observersByType ) {
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try {
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const response = await Promise.resolve( observer.callback( data ) );
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if ( typeof response !== 'object' || response === null ) {
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continue;
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}
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if ( ! response.hasOwnProperty( 'type' ) ) {
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throw new Error(
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'If you want to abort event emitter processing, your observer must return an object with a type property'
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);
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}
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return response;
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} catch ( e ) {
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// We don't handle thrown errors but just console.log for troubleshooting.
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// eslint-disable-next-line no-console
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console.error( e );
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return { type: 'error' };
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}
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}
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return true;
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};
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