Comments with `@~~` cause compiler errors when accessing member of Generic

[Rokt33r]

TypeScript Version: 2.4.0

Code

  export interface PureAction <ACTION_TYPE> extends Redux.Action {
    readonly type: ACTION_TYPE
  }

  export interface PayloadAction <ACTION_TYPE, PAYLOAD> extends Redux.Action {
    readonly type: ACTION_TYPE
    readonly payload: PAYLOAD
  }

  export type Action = PureAction<any> | PayloadAction<any, any>

  export function createActionCreator <ACTION extends PayloadAction<ACTION['type'], ACTION['payload']>>(type: ACTION['type']): (payload: ACTION['payload']) => ACTION
  export function createActionCreator <ACTION extends PureAction<ACTION['type']>>(type: ACTION['type']): () => ACTION
  export function createActionCreator <ACTION extends PayloadAction<ACTION['type'], ACTION['payload']>>(type: ACTION['type']): (payload: ACTION['payload']) => ACTION {
    return (payload: any) => {
      if (payload == null) {
        return ({
          type,
        } as ACTION)
      }
      return ({
        type,
        payload,
      } as ACTION)
    }
  }

  type Reducer<STATE, ACTION> = (state: STATE, action: ACTION) => STATE
  /**
   *
   * test
   *
   * @export
   * @class MappedReducer
   * @template STATE
   * @template ACTION
   * @template Action
   * @template ACTION_TYPE
   * @template ACTION
   */
  export class MappedReducer<STATE, ACTION extends Action = Action, ACTION_TYPE extends ACTION['type'] = ACTION['type']> {
  }

Expected behavior:
No errors
Actual behavior:
[ts] Type '"type"' cannot be used to index type 'ACTION'. error occurred twice on Line 41:
export class MappedReducer<STATE, ACTION extends Action = Action, ACTION_TYPE extends ACTION['type']=ACTION['type']>

It works well if I delete all comment lines with @~~ like @export and @template.

[ikatyang]

It should be duplicate of #16358, fixed by #16413 (v2.4.1).

For now you can try typescript@next, it works fine without errors.

[Rokt33r]

@ikatyang Thanks!