Bug: private module 'shared' is referenced in shipped type declarations

[pvdstel]

Lexical version: 0.14.5, change introduced in 0.14.4 (via #5831).

Steps To Reproduce

1. Create a new project (pnpm init).
2. Add the relevant dependencies (pnpm add typescript lexical @lexical/utils).
3. Add a file index.ts in VSCode with the following contents:

   import { CAN_USE_DOM } from '@lexical/utils';

4. Navigate to the symbol CAN_USE_DOM. TypeScript will be complaining:

   Cannot find module 'shared/canUseDOM' or its corresponding type declarations.
   

   The same is true for shared/environment.

It should be noted that this is merely a TypeScript issue, as the names are exported from the JS bundles.

The current behavior

TypeScript is showing errors since the private module shared cannot be found. This is affecting TypeScript projects that use Lexical 0.14.5.

The expected behavior

The declarations of these variables should not rely on the private package.

[etrepum]

Confirmed that this only affects the one module:

❯ rg "'shared/" '.ts-temp/'
.ts-temp/lexical-utils/src/index.d.ts
13:export { CAN_USE_DOM } from 'shared/canUseDOM';
14:export { CAN_USE_BEFORE_INPUT, IS_ANDROID, IS_ANDROID_CHROME, IS_APPLE, IS_APPLE_WEBKIT, IS_CHROME, IS_FIREFOX, IS_IOS, IS_SAFARI, } from 'shared/environment';