Function createDevSigner

createDevSigner(name: DevAccountName): PolkadotSigner
Create a PolkadotSigner for a standard Substrate dev account.

Dev accounts use the well-known Substrate dev mnemonic (DEV_PHRASE) with Sr25519 key derivation at the path //{Name}. These accounts have known private keys and are pre-funded on dev/test chains.

Only for local development, scripts, and testing. Never use in production.
Parameters
- name: DevAccountName
  Dev account name ("Alice", "Bob", "Charlie", "Dave", "Eve", or "Ferdie").
Returns PolkadotSigner
A PolkadotSigner that can sign transactions.
Example
```
import { createDevSigner } from "@polkadot-apps/tx";

const alice = createDevSigner("Alice");
const result = await submitAndWatch(tx, alice);
```
- Defined in packages/tx/src/dev-signers.ts:27