JSCallback

import { JSCallback, FFIType } from 'arkffi';

const cb = new JSCallback(
  (a: number, b: number): number => a + b,
  { args: [FFIType.int32, FFIType.int32], returns: FFIType.int32 },
);

cb.call(2, 3); // → 5
cb.ptr;        // → slot handle or trampoline address
cb.close();

constructor(
  callback: (...args: any[]) => any,
  def: {
    args: string[];
    returns: string;
    threadsafe?: boolean;
  },
);

get ptr(): number;

getHandle(): number;

readonly threadsafe: boolean;

call(...args: any[]): any;

cb.call(7);  // → 70

close(): void;

cb.close();
cb.call(1); // throws

const cb = new JSCallback(fn, {
  args: [FFIType.int32],
  returns: FFIType.double,
  threadsafe: true,
});
cb.threadsafe; // → true

const fn = CFunction({ args: [FFIType.int32], returns: FFIType.int32, ptr: cb.ptr });
fn(7); // → 21
fn.close();

let factor = 10;
const cb = new JSCallback(
  (x: number): number => x * factor,
  { args: [FFIType.int32], returns: FFIType.int32 },
);
cb.call(5); // → 50
factor = 20;
cb.call(5); // → 100
cb.close();