Deno.truncate
Truncates (or extends) the specified file, to reach the specified len. If len is not specified then the entire file contents are truncated.
Truncate the entire file
await Deno.truncate("my_file.txt");
Truncate part of the file
const file = await Deno.makeTempFile();
await Deno.writeFile(file, new TextEncoder().encode("Hello World"));
await Deno.truncate(file, 7);
const data = await Deno.readFile(file);
console.log(new TextDecoder().decode(data)); // "Hello W"
Requires allow-write permission.
function truncate(name: string, len?: number): Promise<void>;
truncate(name: string, len?: number): Promise<void>
Parameters
name: string
len?: number optional
Return Type
Promise<void>
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https://doc.deno.land/deno/stable/~/Deno.truncate