Function getChain

getChain(chainName?: string): Chain
Gets a chain by name or defaults to mainnet
Parameters
- OptionalchainName: string
  Name of the chain (supports camelCase, lowercase, or kebab-case)
Returns Chain
The chain configuration
Throws
If chain name is not supported
Example
```
getChain('mainnet') // Ethereum mainnet
getChain('arbitrum') // Arbitrum One
getChain('polygon-zkevm') // Polygon zkEVM
```
- Defined in config/chains.ts:38