'snap' in this toturial comes from no-where!

pooria · August 2, 2023, 6:14pm

is it something which imposes by MetaMask ?

montoya · August 2, 2023, 9:52pm

Hi, this tutorial walks you through modifying the template snap. The template snap code is here:

MetaMask/template-snap-monorepo/blob/main/packages/snap/src/index.ts

import { OnRpcRequestHandler } from '@metamask/snaps-types';
import { panel, text } from '@metamask/snaps-ui';

/**
 * Handle incoming JSON-RPC requests, sent through `wallet_invokeSnap`.
 *
 * @param args - The request handler args as object.
 * @param args.origin - The origin of the request, e.g., the website that
 * invoked the snap.
 * @param args.request - A validated JSON-RPC request object.
 * @returns The result of `snap_dialog`.
 * @throws If the request method is not valid for this snap.
 */
export const onRpcRequest: OnRpcRequestHandler = ({ origin, request }) => {
  switch (request.method) {
    case 'hello':
      return snap.request({
        method: 'snap_dialog',
        params: {
          type: 'confirmation',

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The snap variable is injected by MetaMask in the snap environment. When you are writing your snap, you can use the snap variable with methods in the Snaps API. You can find the various methods here:

pooria · August 2, 2023, 10:04pm

thx problem solved .