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feat(unstable): add Deno.ftruncate and ftruncateSync (#6243)

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Casper Beyer 2020-06-20 21:46:10 +08:00 • committed by GitHub
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39
cli/js/lib.deno.unstable.d.ts vendored
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@ -1248,4 +1248,43 @@ declare namespace Deno {
/** **UNSTABLE**: The URL of the file that was originally executed from the command-line. */
export const mainModule: string;
/** Synchronously truncates or extends the specified file stream, to reach the
* specified `len`. If `len` is not specified then the entire file contents
* are truncated.
*
* ```ts
* // truncate the entire file
* const file = Deno.open("my_file.txt", { read: true, write: true, truncate: true, create: true });
* Deno.ftruncateSync(file.rid);
*
* // truncate part of the file
* const file = Deno.open("my_file.txt", { read: true, write: true, create: true });
* Deno.write(file.rid, new TextEncoder().encode("Hello World"));
* Deno.ftruncateSync(file.rid, 7);
* const data = new Uint8Array(32);
* Deno.readSync(file.rid, data);
* console.log(new TextDecoder().decode(data)); // Hello W
* ```
*/
export function ftruncateSync(rid: number, len?: number): void;
/** Truncates or extends the specified file stream, to reach the specified `len`. If
* `len` is not specified then the entire file contents are truncated.
*
* ```ts
* // truncate the entire file
* const file = Deno.open("my_file.txt", { read: true, write: true, create: true });
* await Deno.ftruncate(file.rid);
*
* // truncate part of the file
* const file = Deno.open("my_file.txt", { read: true, write: true, create: true });
* await Deno.write(file.rid, new TextEncoder().encode("Hello World"));
* await Deno.ftruncate(file.rid, 7);
* const data = new Uint8Array(32);
* await Deno.read(file.rid, data);
* console.log(new TextDecoder().decode(data)); // Hello W
* ```
*/
export function ftruncate(rid: number, len?: number): Promise<void>;
}