Try enabling no-unused-variable...

packages/sol-compiler/test/compiler_test.ts

@@ -5,7 +5,7 @@ import 'mocha';
 
 import { Compiler } from '../src/compiler';
 import { fsWrapper } from '../src/utils/fs_wrapper';
-import { CompilerOptions, ContractArtifact, ContractNetworkData } from '../src/utils/types';
+import { CompilerOptions, ContractArtifact } from '../src/utils/types';
 
 import { exchange_binary } from './fixtures/exchange_bin';
 import { constants } from './util/constants';

packages/sol-compiler/test/util/provider.ts

@@ -1,6 +1,5 @@
 import { web3Factory } from '@0xproject/dev-utils';
 import { Provider } from 'ethereum-types';
-import * as Web3 from 'web3';
 
 const providerConfigs = { shouldUseInProcessGanache: true };
 const provider: Provider = web3Factory.getRpcProvider(providerConfigs);