InvokeArgs

Command arguments.

An object is the usual form: each key becomes a command parameter, serialized as JSON (application/octet-stream is used instead when a value implements {@linkcode SERIALIZE_TO_IPC_FN}, see its documentation).

The ArrayBuffer, Uint8Array and number[] variants are a raw payload: the whole request body is sent as application/octet-stream instead of JSON, which avoids the cost of base64/array encoding for large binary data. The command then has a single tauri::ipc::Request parameter and reads the bytes from it:

#[tauri::command]
fn upload(request: tauri::ipc::Request<'_>) -> Result<(), String> {
  let tauri::ipc::InvokeBody::Raw(bytes) = request.body() else {
    return Err("expected a raw body".into());
  };
  println!("got {} bytes", bytes.len());
  Ok(())
}

import { invoke } from '@tauri-apps/api/core';
await invoke('upload', new Uint8Array([1, 2, 3]));

A command that returns tauri::ipc::Response likewise resolves to an ArrayBuffer on the frontend instead of a JSON value.