About syntax detection, jslint and tsc build config

[qqqzhch]

About syntax check, jslint and tsc build config Recently, I made some changes to my wallet. After modifying the error message of jslint prompt, I started to build. I found that there was also syntax information that caused the package to fail, I checked that it was caused by the configuration during the build of typesript

tsc --build tsconfig.build.json

I think such syntax check should be same in development and build，Or include it in jslint instead of finding a lot of syntax errors when preparing to build

> tsc --build tsconfig.build.json&&polkadot-dev-run-lint

packages/extension-base/src/background/handlers/State.ts:15:1 - error TS6133: 'accountsObservable' is declared but its value is never read.

15 import { accounts as accountsObservable } from '@polkadot/ui-keyring/observable/accounts';
   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

packages/extension-base/src/background/handlers/State.ts:156:10 - error TS2564: Property 'API' has no initializer and is not definitely assigned in the constructor.

156   public API: ApiPromise;

• [ ] Bug report
• [ ] Feature request
• [ ] Support request
• [x] Other

• What is the current behavior and expected behavior? Syntax detection jslint should be the same when developing and building or jslint

• What is the motivation for changing the behavior? tsc --build tsconfig.build.json&&polkadot-dev-run-lint