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performance.ts
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performance.ts
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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import * as msg from "gen/msg_generated";
import { sendSync } from "./dispatch";
import * as flatbuffers from "./flatbuffers";
import { assert } from "./util";
export class Performance {
timeOrigin = 0;
constructor() {
this.timeOrigin = new Date().getTime();
}
/** Returns a current time from Deno's start
*
* const t = performance.now();
* console.log(`${t} ms since start!`);
*/
now(): number {
const builder = flatbuffers.createBuilder();
msg.Now.startNow(builder);
const inner = msg.Now.endNow(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.time().toFloat64() - this.timeOrigin;
}
}