@gear-js/api/lib/metadata/stateMetadata.js

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

import { CreateType } from './create-type.js';
import { GearMetadata } from './metadata.js';
import importObj from '../wasm/importObj.js';

class StateMetadata extends GearMetadata {
    functions;
    constructor({ reg, functions }) {
        super(reg);
        this.functions = functions;
    }
}
/**
 * @deprecated - This functionality is deprecated and will be removed from both the API and the runtime. Use `api.message.calculateReply` instead.
 */
async function getStateMetadata(wasmBytes) {
    const memory = new WebAssembly.Memory({ initial: 17 });
    let resolveMetadataPromise;
    const metadata = new Promise((resolve) => {
        resolveMetadataPromise = resolve;
    });
    const { instance } = (await WebAssembly.instantiate(wasmBytes, importObj(memory, undefined, undefined, undefined, undefined, (payload, len) => {
        resolveMetadataPromise(new Uint8Array(memory.buffer.slice(payload, payload + len)));
    })));
    const { exports } = instance;
    if (!exports?.metadata) {
        throw new Error('Unable to find metadata function in exports of applied wasm');
    }
    if (typeof exports.metadata !== 'function') {
        throw new Error('exports.metadata is not a function');
    }
    exports.metadata();
    const meta = CreateType.create('StateMetadataRepr', await metadata);
    return new StateMetadata(meta.toJSON());
}

export { StateMetadata, getStateMetadata };