forked from denoland/deno
-
Notifications
You must be signed in to change notification settings - Fork 0
/
performance.ts
24 lines (23 loc) · 870 Bytes
/
performance.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import * as msg from "gen/cli/msg_generated";
import { sendSync } from "./dispatch";
import * as flatbuffers from "./flatbuffers";
import { assert } from "./util";
export class Performance {
/** Returns a current time from Deno's start.
* In milliseconds. Flag --allow-high-precision give
* a precise measure.
*
* const t = performance.now();
* console.log(`${t} ms since start!`);
*/
now(): number {
const builder = flatbuffers.createBuilder();
const inner = msg.Now.createNow(builder);
const baseRes = sendSync(builder, msg.Any.Now, inner)!;
assert(msg.Any.NowRes === baseRes.innerType());
const res = new msg.NowRes();
assert(baseRes.inner(res) != null);
return res.seconds().toFloat64() * 1e3 + res.subsecNanos() / 1e6;
}
}