53 lines
1.5 KiB
JavaScript
53 lines
1.5 KiB
JavaScript
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'use strict';
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const { Session } = require('inspector');
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const { promisify } = require('util');
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class CoverageInstrumenter {
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constructor() {
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this.session = new Session();
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this.postSession = promisify(this.session.post.bind(this.session));
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}
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async startInstrumenting() {
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this.session.connect();
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await this.postSession('Profiler.enable');
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await this.postSession('Profiler.startPreciseCoverage', {
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callCount: true,
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detailed: true,
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});
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}
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async stopInstrumenting() {
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const {result} = await this.postSession(
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'Profiler.takePreciseCoverage',
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);
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await this.postSession('Profiler.stopPreciseCoverage');
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await this.postSession('Profiler.disable');
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// When using networked filesystems on Windows, v8 sometimes returns URLs
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// of the form file:////<host>/path. These URLs are not well understood
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// by NodeJS (see https://github.com/nodejs/node/issues/48530).
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// We circumvent this issue here by fixing these URLs.
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// FWIW, Python has special code to deal with URLs like this
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// https://github.com/python/cpython/blob/bef1c8761e3b0dfc5708747bb646ad8b669cbd67/Lib/nturl2path.py#L22C1-L22C1
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if (process.platform === 'win32') {
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const prefix = 'file:////';
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result.forEach(res => {
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if (res.url.startsWith(prefix)) {
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res.url = 'file://' + res.url.slice(prefix.length);
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}
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})
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}
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return result;
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}
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}
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module.exports.CoverageInstrumenter = CoverageInstrumenter;
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