88 lines
2.3 KiB
JavaScript
88 lines
2.3 KiB
JavaScript
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import { ClientFunction as exec } from 'testcafe'
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export const installDomListenerListener = exec(() => {
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function eql (a, b) {
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const aType = typeof a
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const bType = typeof b
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switch (aType) {
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case 'boolean':
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return bType === 'boolean' && b === a
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case 'undefined':
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return bType === 'undefined'
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case 'object':
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if (a === null) {
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return b === null
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}
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if (b === null) {
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return false
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}
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if (Object.keys(a).length !== Object.keys(b).length) {
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return false
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}
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for (const key of Object.keys(a)) {
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if (a[key] !== b[key]) {
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return false
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}
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}
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return true
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}
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return false
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}
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function spyAddListener (proto) {
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const addEventListener = proto.addEventListener
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proto.addEventListener = function (type, listener, options) {
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if (!this.__listeners) {
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this.__listeners = {}
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}
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if (!this.__listeners[type]) {
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this.__listeners[type] = []
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}
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this.__listeners[type].push({ listener, options })
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return addEventListener.apply(this, arguments)
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}
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}
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function spyRemoveListener (proto) {
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const removeEventListener = proto.removeEventListener
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proto.removeEventListener = function (type, listener, options) {
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if (this.__listeners && this.__listeners[type]) {
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const arr = this.__listeners[type]
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for (let i = arr.length - 1; i >= 0; i--) {
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const { listener: otherListener, options: otherOptions } = arr[i]
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if (listener === otherListener && eql(options, otherOptions)) {
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arr.splice(i, 1)
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}
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}
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}
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return removeEventListener.apply(this, arguments)
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}
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}
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function spy (proto) {
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spyAddListener(proto)
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spyRemoveListener(proto)
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}
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spy(Element.prototype)
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spy(document)
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spy(window)
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})
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export const getNumDomListeners = exec(() => {
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function getNumListeners (obj) {
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let sum = 0
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if (obj.__listeners) {
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for (const key of Object.keys(obj.__listeners)) {
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sum += obj.__listeners[key].length
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}
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}
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return sum
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}
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return [...document.querySelectorAll('*')]
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.concat([window, document])
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.map(getNumListeners)
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.reduce((a, b) => a + b, 0)
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})
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