TypeError in wasm

[craggy lynx]

this is zig function

export fn twoed(n: i32) i32 {
    return n * 2;
}

export fn rando(seed: u128, min: u128, max: u128) u128 {
    return (((seed * 1103515245) + 12345) & 0x7FFFFFFF) % (max - min) + min;
}

I built with this command
zig build-lib -dynamic -rdynamic -target wasm32-freestanding bum.zig
And called it from JavaScript

"use strict";
const wasmModule = await WebAssembly.instantiateStreaming(fetch('bum.wasm'));
const { twoed, rando } = wasmModule.instance.exports;
console.log(twoed(10));
console.log(rando(Math.floor(Date.now() / 1000), 200, 5302));

and I got this error for the rando function

Uncaught TypeError: can't convert 200 to BigInt

help

[shadow tendon]

you might need to convert it explicitly

write 200n instead of 200

n makes it a bigint

[slate spruce]

Also, your function signature is entirely wrong on JS side. u128 arguments and return types do not get passed through like that

For return types an sparam is used and for arguments it’s passed as 2 64bit integers

[shadow tendon]

oh i didn't know that, interesting

[craggy lynx]

thanks to both. Now this is a js question I guess. I changed all the u128 to u64, and now I get this error

Uncaught TypeError: can't convert 1699262970 to BigInt

How to convert Math.floor(Date.now() / 1000) to BigInt?

[shadow tendon]

BigInt(Math.floor(...))