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denoland-deno/cli/js/performance.ts

22 lines
623 B
TypeScript

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import * as dispatch from "./dispatch.ts";
import { sendSync } from "./dispatch_json.ts";
interface NowResponse {
seconds: number;
subsecNanos: number;
}
export class Performance {
/** Returns a current time from Deno's start in milliseconds.
*
* Use the flag --allow-hrtime return a precise value.
*
* const t = performance.now();
* console.log(`${t} ms since start!`);
*/
now(): number {
const res = sendSync(dispatch.OP_NOW) as NowResponse;
return res.seconds * 1e3 + res.subsecNanos / 1e6;
}
}