message: [Trivial] Spread config() type for type-checking & better IDE integration
diff: import deepFreeze from 'deep-freeze';
  import { UNIT_TIME, MILLISECONDS } from './types/Common';
  -export const config = () => {
  - return deepFreeze({
  +const conf = {
  version: '0.1',
  /** Configuration related with session */
  session: {
  @@ -65,7 +64,10 @@ export const config = () => {
  linkText: 'Visit our web page'
  }
  }
  - });
  +};
  +
  +export const config = () => {
  + return deepFreeze(conf) as typeof conf;
  };
  /** Istio logo */
  