rimmel/dist/esm/utils/to-listener.js

A Streams-Oriented UI library for the Rx.Observable Universe

import { isObjectSource, ObjectSource } from '../sources/object-source.js';
import { isObserverSource, ObserverSource } from '../sources/observer-source.js';
import { isEventListenerObjectSource, EventListenerObjectSource } from '../sources/event-listener-object-source.js';
import { isFunction } from './is-function.js';

/**
 * Convert a function, Observer or Observature to a listener function.
 * @param expression RMLTemplateExpression
 * @returns function | null a callable event listener function
 */
const toListener = (expression) => 
// FIXME: too similar to callable. Merge them
isObserverSource(expression) ? ObserverSource(expression)
    : isFunction(expression) ? expression
        : isEventListenerObjectSource(expression) ? EventListenerObjectSource(expression)
            : isObjectSource(expression) ? ObjectSource(...expression)
                : null // We allow it to be empty. If so, ignore, and don't connect any source. Perhaps add a warning in debug mode?
;

export { toListener };
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