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node:inspector + V8 Profiler.*PreciseCoverage
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import { writeFileSync } from "node:fs"; | |
import inspector from "node:inspector"; | |
function firstMethod() {} | |
function secondMethod() {} | |
const session = new inspector.Session(); | |
const collectedCoverage = []; | |
session.connect(); | |
session.post("Profiler.enable"); | |
session.post("Runtime.enable"); | |
session.post("Profiler.startPreciseCoverage", { | |
callCount: true, | |
detailed: true, | |
}); | |
firstMethod(); | |
await collectCoverage(); | |
secondMethod(); | |
await collectCoverage(); | |
async function collectCoverage() { | |
await new Promise((resolve, reject) => { | |
session.post("Profiler.takePreciseCoverage", async (error, coverage) => { | |
if (error) return reject(error); | |
const filtered = coverage.result.filter( | |
(entry) => !entry.url.startsWith("node:") | |
); | |
collectedCoverage.push(...filtered); | |
resolve(); | |
}); | |
}); | |
} | |
writeFileSync( | |
"./coverage.json", | |
JSON.stringify(collectedCoverage, null, 2), | |
"utf8" | |
); |
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[ | |
{ | |
"scriptId": "132", | |
"url": "file:///x/y/repro/index.mjs", | |
"functions": [ | |
{ | |
"functionName": "firstMethod", | |
"ranges": [ | |
{ | |
"startOffset": 82, | |
"endOffset": 107, | |
"count": 1 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "collectCoverage", | |
"ranges": [ | |
{ | |
"startOffset": 465, | |
"endOffset": 844, | |
"count": 1 | |
}, | |
{ | |
"startOffset": 842, | |
"endOffset": 843, | |
"count": 0 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "", | |
"ranges": [ | |
{ | |
"startOffset": 520, | |
"endOffset": 840, | |
"count": 1 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "", | |
"ranges": [ | |
{ | |
"startOffset": 592, | |
"endOffset": 834, | |
"count": 0 | |
} | |
], | |
"isBlockCoverage": false | |
} | |
] | |
}, | |
{ | |
"scriptId": "132", | |
"url": "file:///x/y/repro/index.mjs", | |
"functions": [ | |
{ | |
"functionName": "", | |
"ranges": [ | |
{ | |
"startOffset": 0, | |
"endOffset": 940, | |
"count": 1 | |
} | |
], | |
"isBlockCoverage": false | |
}, | |
{ | |
"functionName": "firstMethod", | |
"ranges": [ | |
{ | |
"startOffset": 82, | |
"endOffset": 107, | |
"count": 0 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "secondMethod", | |
"ranges": [ | |
{ | |
"startOffset": 108, | |
"endOffset": 134, | |
"count": 1 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "collectCoverage", | |
"ranges": [ | |
{ | |
"startOffset": 465, | |
"endOffset": 844, | |
"count": 1 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "", | |
"ranges": [ | |
{ | |
"startOffset": 520, | |
"endOffset": 840, | |
"count": 1 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "", | |
"ranges": [ | |
{ | |
"startOffset": 592, | |
"endOffset": 834, | |
"count": 1 | |
}, | |
{ | |
"startOffset": 638, | |
"endOffset": 659, | |
"count": 0 | |
} | |
], | |
"isBlockCoverage": true | |
}, | |
{ | |
"functionName": "", | |
"ranges": [ | |
{ | |
"startOffset": 716, | |
"endOffset": 757, | |
"count": 3 | |
} | |
], | |
"isBlockCoverage": true | |
} | |
] | |
} | |
] |
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