declare module '@metamask/detect-provider' {
interface EthereumProvider {
    isMetaMask?: boolean;
}
declare global {
    interface Window {
        ethereum?: EthereumProvider;
    }
}
export = detectEthereumProvider;
/**
 * Returns a Promise that resolves to the value of window.ethereum if it is
 * set within the given timeout, or null.
 * The Promise will not reject, but an error will be thrown if invalid options
 * are provided.
 *
 * @param options - Options bag.
 * @param options.mustBeMetaMask - Whether to only look for MetaMask providers.
 * Default: false
 * @param options.silent - Whether to silence console errors. Does not affect
 * thrown errors. Default: false
 * @param options.timeout - Milliseconds to wait for 'ethereum#initialized' to
 * be dispatched. Default: 3000
 * @returns A Promise that resolves with the Provider if it is detected within
 * given timeout, otherwise null.
 */
declare function detectEthereumProvider({ mustBeMetaMask, silent, timeout, }?: {
    mustBeMetaMask?: boolean | undefined;
    silent?: boolean | undefined;
    timeout?: number | undefined;
}): Promise<unknown>;

}

"use strict";
/**
 * Returns a Promise that resolves to the value of window.ethereum if it is
 * set within the given timeout, or null.
 * The Promise will not reject, but an error will be thrown if invalid options
 * are provided.
 *
 * @param options - Options bag.
 * @param options.mustBeMetaMask - Whether to only look for MetaMask providers.
 * Default: false
 * @param options.silent - Whether to silence console errors. Does not affect
 * thrown errors. Default: false
 * @param options.timeout - Milliseconds to wait for 'ethereum#initialized' to
 * be dispatched. Default: 3000
 * @returns A Promise that resolves with the Provider if it is detected within
 * given timeout, otherwise null.
 */
function detectEthereumProvider({ mustBeMetaMask = false, silent = false, timeout = 3000, } = {}) {
    _validateInputs();
    let handled = false;
    return new Promise((resolve) => {
        if (window.ethereum) {
            handleEthereum();
        }
        else {
            window.addEventListener('ethereum#initialized', handleEthereum, { once: true });
            setTimeout(() => {
                handleEthereum();
            }, timeout);
        }
        function handleEthereum() {
            if (handled) {
                return;
            }
            handled = true;
            window.removeEventListener('ethereum#initialized', handleEthereum);
            const { ethereum } = window;
            if (ethereum && (!mustBeMetaMask || ethereum.isMetaMask)) {
                resolve(ethereum);
            }
            else {
                const message = mustBeMetaMask && ethereum
                    ? 'Non-MetaMask window.ethereum detected.'
                    : 'Unable to detect window.ethereum.';
                !silent && console.error('@metamask/detect-provider:', message);
                resolve(null);
            }
        }
    });
    function _validateInputs() {
        if (typeof mustBeMetaMask !== 'boolean') {
            throw new Error(`@metamask/detect-provider: Expected option 'mustBeMetaMask' to be a boolean.`);
        }
        if (typeof silent !== 'boolean') {
            throw new Error(`@metamask/detect-provider: Expected option 'silent' to be a boolean.`);
        }
        if (typeof timeout !== 'number') {
            throw new Error(`@metamask/detect-provider: Expected option 'timeout' to be a number.`);
        }
    }
}
module.exports = detectEthereumProvider;
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@metamask/detect-provider


<Tip title="Recommended Reading">
We recommend that all web3 site developers read the [Basic Usage](#basic-usage) section.
</Tip>

<Tip title="Recent Breaking Provider Changes">
If you are an Ethereum application developer and are looking for information about our January 2021 provider API changes,
please see our [Migration Guide](./provider-migration.html) for more details.
</Tip>

MetaMask injects a global API into websites visited by its users at `window.ethereum`.
This API allows websites to request users' Ethereum accounts, read data from blockchains the user is connected to, and suggest that the user sign messages and transactions.
The presence of the provider object indicates an Ethereum user.
We recommend using [`@metamask/detect-provider`](https://npmjs.com/package/@metamask/detect-provider) to detect our provider, on any platform or browser.

The Ethereum JavaScript provider API is specified by [EIP-1193](https://eips.ethereum.org/EIPS/eip-1193).

```ruby norun
class EmailContact
  include ActiveModel::API

  attr_accessor :name, :email, :message
  validates :name, :email, :message, presence: true

  def deliver
    if valid?
      # deliver email
    end
  end
end
```

```shell norun
ls -la
```

```javascript norun
const accounts = await ethereum.request({ method: 'eth_requestAccounts' });
const account = accounts[0];
```

```typescript
// This function detects most providers injected at window.ethereum
import detectEthereumProvider from '@metamask/detect-provider';

const provider: any | null = await detectEthereumProvider();

if (provider) {
  // From now on, this should always be true:
  console.log("oooh", "yaaaaa", provider,[1,2,3, {a: 123, b: 321 }]);
  console.log("oooh", "yaaaaa");
  console.log(provider)
  console.log([1,2,3, {a: 123, b: 321 }]);
  // initialize your app
} else {
  console.log('Please install MetaMask!');
}
```

The Ethereum JavaScript provider API is specified by [EIP-1193](https://eips.ethereum.org/EIPS/eip-1193).

```javascript
// This function detects most providers injected at window.ethereum
import detectEthereumProvider from '@metamask/detect-provider';

const provider = await detectEthereumProvider();

if (provider) {
  // From now on, this should always be true:
  // provider === window.ethereum
  startApp(provider); // initialize your app
} else {
  console.log('Please install MetaMask!');
}
function startApp() {
  console.log("starting app now that metamask is ready");
}
```
