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denoland-deno/js/truncate.ts
Ryan Dahl d43b43ca78
Refactor snapshot build (#2825)
Instead of using core/snapshot_creator.rs, instead two crates are
introduced which allow building the snapshot during build.rs.

Rollup is removed and replaced with our own bundler. This removes
the Node build dependency. Modules in //js now use Deno-style imports
with file extensions, rather than Node style extensionless imports.

This improves incremental build time when changes are made to //js files
by about 40 seconds.
2019-09-02 17:07:11 -04:00

34 lines
902 B
TypeScript

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import { sendSync, sendAsync } from "./dispatch_json.ts";
import * as dispatch from "./dispatch.ts";
function coerceLen(len?: number): number {
if (!len) {
return 0;
}
if (len < 0) {
return 0;
}
return len;
}
/** Truncates or extends the specified file synchronously, updating the size of
* this file to become size.
*
* Deno.truncateSync("hello.txt", 10);
*/
export function truncateSync(name: string, len?: number): void {
sendSync(dispatch.OP_TRUNCATE, { name, len: coerceLen(len) });
}
/**
* Truncates or extends the specified file, updating the size of this file to
* become size.
*
* await Deno.truncate("hello.txt", 10);
*/
export async function truncate(name: string, len?: number): Promise<void> {
await sendAsync(dispatch.OP_TRUNCATE, { name, len: coerceLen(len) });
}