@gear-js/api/lib/wasm/reply.js

A JavaScript library that provides functionality to connect GEAR Component APIs.

import { isHex, hexToU8a, isU8a } from '@polkadot/util';
import importObj from './importObj.js';

function getGrReply(wasm, fn) {
    const buffer = isHex(wasm) ? hexToU8a(wasm).buffer : isU8a(wasm) ? wasm.buffer : wasm;
    const memory = new WebAssembly.Memory({ initial: 256 });
    return new Promise((resolve, reject) => {
        WebAssembly.instantiate(buffer, importObj(memory, false, undefined, undefined, undefined, (payload, len) => resolve(new Uint8Array(memory.buffer.slice(payload, payload + len)))))
            // @ts-expect-error: Invalid typings here. instance is actually a prop of WebAssembly.Instance
            .then(({ instance: { exports } }) => {
            if (!(fn in exports)) {
                reject(`${fn} function not found in exports`);
            }
            else if (typeof exports[fn] !== 'function') {
                reject(`${fn} is not a function`);
            }
            else {
                exports[fn]();
            }
        })
            .catch((error) => reject(error));
    });
}

export { getGrReply };