svelte/src/shared/index.js

export * from './dom.js';
export * from './methods.js';

export function noop () {}

export function dispatchObservers ( component, group, newState, oldState ) {
	for ( var key in group ) {
		if ( !( key in newState ) ) continue;

		var newValue = newState[ key ];
		var oldValue = oldState[ key ];

		if ( newValue === oldValue && typeof newValue !== 'object' ) continue;

		var callbacks = group[ key ];
		if ( !callbacks ) continue;

		for ( var i = 0; i < callbacks.length; i += 1 ) {
			var callback = callbacks[i];
			if ( callback.__calling ) continue;

			callback.__calling = true;
			callback.call( component, newValue, oldValue );
			callback.__calling = false;
		}
	}
}