puppeteer-core/lib/esm/puppeteer/bidi/EmulationManager.js

A high-level API to control headless Chrome over the DevTools Protocol

/**
 * @internal
 */
export class EmulationManager {
    #browsingContext;
    constructor(browsingContext) {
        this.#browsingContext = browsingContext;
    }
    async emulateViewport(viewport) {
        await this.#browsingContext.connection.send('browsingContext.setViewport', {
            context: this.#browsingContext.id,
            viewport: viewport.width && viewport.height
                ? {
                    width: viewport.width,
                    height: viewport.height,
                }
                : null,
            devicePixelRatio: viewport.deviceScaleFactor
                ? viewport.deviceScaleFactor
                : null,
        });
    }
}
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