48 lines
1.2 KiB
JavaScript
48 lines
1.2 KiB
JavaScript
import { isServer } from '..';
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// eslint-disable-next-line import/no-mutable-exports
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export var supportsPassive = false;
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if (!isServer) {
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try {
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var opts = {};
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Object.defineProperty(opts, 'passive', {
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// eslint-disable-next-line getter-return
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get: function get() {
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/* istanbul ignore next */
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supportsPassive = true;
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}
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});
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window.addEventListener('test-passive', null, opts); // eslint-disable-next-line no-empty
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} catch (e) {}
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}
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export function on(target, event, handler, passive) {
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if (passive === void 0) {
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passive = false;
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}
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if (!isServer) {
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target.addEventListener(event, handler, supportsPassive ? {
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capture: false,
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passive: passive
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} : false);
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}
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}
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export function off(target, event, handler) {
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if (!isServer) {
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target.removeEventListener(event, handler);
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}
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}
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export function stopPropagation(event) {
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event.stopPropagation();
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}
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export function preventDefault(event, isStopPropagation) {
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/* istanbul ignore else */
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if (typeof event.cancelable !== 'boolean' || event.cancelable) {
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event.preventDefault();
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}
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if (isStopPropagation) {
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stopPropagation(event);
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}
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} |