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July 16, 2021 14:53
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Wrap reselect's createSelector with a function that measures how long selectors take to run
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import {createSelector} from 'reselect'; | |
const hasPerformanceApi = | |
window && | |
window.performance && | |
window.performance.measure && | |
window.performance.mark; | |
const createFuncWithMark = (name, callback) => (...args) => { | |
const startMark = `${name}-Startmark`; | |
const endMark = `${name}-EndMark`; | |
window.performance.mark(startMark); | |
const result = callback(...args); | |
window.performance.mark(endMark); | |
window.performance.measure('♻️ ' + `${name}-Selector`, startMark, endMark); | |
window.performance.clearMarks(startMark); | |
window.performance.clearMarks(endMark); | |
window.performance.clearMeasures(startMark); | |
window.performance.clearMeasures(endMark); | |
return result; | |
}; | |
export const createMarkedSelector = (name, ...args) => { | |
if (!hasPerformanceApi) { | |
return createSelector(...args); | |
} | |
if (!name || typeof name !== 'string') { | |
throw new Error('marked selectors must have names'); | |
} | |
const callback = args.pop(); | |
const funcWithMark = createFuncWithMark(name, callback); | |
args.push(funcWithMark); | |
return createSelector(...args); | |
}; |
This is the regex I use in vscode to on mass replace createSelector
with createMarkedSelector
https://gist.github.com/TerribleDev/da2fa46ce3194f69ef04239260cacb38
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you can use this by instead of calling
createSelector
callcreateMarkedSelector('yourSelectorName', ...)