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October 20, 2020 13:22
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Get mean data from multiple lighthouse reports
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const glob = require("glob"); | |
const path = require("path"); | |
const configs = []; | |
glob.sync("./lh-reports/*.json").forEach(file => { | |
configs.push(require(path.resolve(file))); | |
}); | |
const stats = { | |
FCP: { value: 0, unit: "s" }, | |
TTI: { value: 0, unit: "s" }, | |
TBT: { value: 0, unit: "ms" }, | |
SI: { value: 0, unit: "s" }, | |
InitialServerResponseTime: { value: 0, unit: "ms" }, | |
ScriptEvaluation: { value: 0, unit: "ms" }, | |
ScriptParsingAndCompilation: { value: 0, unit: "ms" }, | |
}; | |
const printStats = result => { | |
for (let [key, value] of Object.entries(result)) { | |
console.log( | |
`${key} : ${(value.value / configs.length).toFixed(2)} ${value.unit}` | |
); | |
} | |
}; | |
const getStats = () => { | |
configs.reduce((acc, config) => { | |
const { audits } = config; | |
const mainThreadInfo = audits["mainthread-work-breakdown"].details.items; | |
acc.FCP.value += audits["first-contentful-paint"].numericValue / 1000; | |
acc.TTI.value += audits["interactive"].numericValue / 1000; | |
acc.TBT.value += audits["total-blocking-time"].numericValue; | |
acc.InitialServerResponseTime.value += | |
audits["server-response-time"].numericValue; | |
acc.SI.value += audits["speed-index"].numericValue; | |
mainThreadInfo.forEach(info => { | |
if (info.group === "scriptEvaluation") { | |
acc.ScriptEvaluation.value += info.duration; | |
} else if (info.group === "scriptParseCompile") { | |
acc.ScriptParsingAndCompilation.value += info.duration; | |
} | |
}); | |
return acc; | |
}, stats); | |
printStats(stats); | |
}; | |
getStats(); |
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