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33 lines
886 B
TypeScript
33 lines
886 B
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import { sendSync, sendAsync } from "../dispatch_json.ts";
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function coerceLen(len?: number): number {
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if (!len) {
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return 0;
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}
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if (len < 0) {
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return 0;
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}
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return len;
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}
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/** Synchronously truncates or extends the specified file, to reach the
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* specified `len`.
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*
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* Deno.truncateSync("hello.txt", 10);
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*
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* Requires `allow-write` permission. */
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export function truncateSync(path: string, len?: number): void {
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sendSync("op_truncate", { path, len: coerceLen(len) });
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}
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/** Truncates or extends the specified file, to reach the specified `len`.
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*
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* await Deno.truncate("hello.txt", 10);
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*
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* Requires `allow-write` permission. */
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export async function truncate(path: string, len?: number): Promise<void> {
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await sendAsync("op_truncate", { path, len: coerceLen(len) });
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}
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