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49 lines
1.4 KiB
TypeScript
49 lines
1.4 KiB
TypeScript
/**
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* Copyright Microsoft Corporation. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import * as fs from 'fs';
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import * as path from 'path';
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const profileDir = process.env.PWTEST_PROFILE_DIR || '';
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let session: import('inspector').Session;
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export async function startProfiling() {
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if (!profileDir)
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return;
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session = new (require('inspector').Session)();
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session.connect();
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await new Promise<void>(f => {
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session.post('Profiler.enable', () => {
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session.post('Profiler.start', f);
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});
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});
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}
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export async function stopProfiling(profileName: string) {
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if (!profileDir)
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return;
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await new Promise<void>(f => session.post('Profiler.stop', (err, { profile }) => {
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if (!err) {
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fs.mkdirSync(profileDir, { recursive: true });
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fs.writeFileSync(path.join(profileDir, profileName + '.json'), JSON.stringify(profile));
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}
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f();
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}));
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}
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