fix: enforce transport-per-chain precondition on createEvmTransactionAdapter

Author: fernandomg

src/sdk/core/evm/transaction.test.ts

@@ -39,6 +39,15 @@ describe('createEvmTransactionAdapter', () => {
     )
   })
 
+  it('throws when a chain has no corresponding transport', () => {
+    expect(() =>
+      createEvmTransactionAdapter({
+        chains: [mainnet],
+        transports: {},
+      }),
+    ).toThrow('chain "Ethereum" (id: 1) has no transport configured')
+  })
+
   // ---------------------------------------------------------------------------
   // structural / metadata
   // ---------------------------------------------------------------------------

src/sdk/core/evm/transaction.ts

@@ -61,6 +61,13 @@ export function createEvmTransactionAdapter(
       'createEvmTransactionAdapter requires at least one chain. Provide chains in config.chains.',
     )
   }
+  for (const chain of config.chains) {
+    if (!config.transports[chain.id]) {
+      throw new Error(
+        `createEvmTransactionAdapter: chain "${chain.name}" (id: ${chain.id}) has no transport configured.`,
+      )
+    }
+  }
   const publicClients = new Map<number, PublicClient>(
     config.chains.map((chain) => [
       chain.id,