playwright-performance-reporter/lib/browsers/chromium/observers/used-js-heap-size.js

Measure and publish performance metrics from browser dev-tools when running playwright

import { performanceDomainPlugin } from '../plugins/index.js';
export class UsedJsHeapSize {
    name = 'usedJsHeapSize';
    chromiumCompatibleName = 'JSHeapUsedSize';
    plugins = [
        performanceDomainPlugin,
    ];
    /**
     * @inheritdoc
     */
    async onStart(accumulator, developmentTools) {
        await this.common(accumulator, developmentTools);
    }
    /**
     * @inheritdoc
     */
    async onSampling(accumulator, developmentTools) {
        await this.common(accumulator, developmentTools);
    }
    /**
     * @inheritdoc
     */
    async onStop(accumulator, developmentTools) {
        await this.common(accumulator, developmentTools);
    }
    /**
     * Common function for onStart and onStop hook
     */
    async common(accumulator, client) {
        return new Promise(resolve => {
            client.send('Performance.getMetrics', (error, cdpResponse) => {
                if (!cdpResponse || Boolean(error)) {
                    resolve(false);
                    return;
                }
                const foundMetric = cdpResponse.metrics.find(metricResponse => metricResponse.name === this.chromiumCompatibleName);
                if (!foundMetric) {
                    resolve(false);
                    return;
                }
                Object.assign(accumulator, { [this.name]: foundMetric.value });
                resolve(true);
            });
        });
    }
}