a5b8420234
Sometimes declarations are not exported publicly but are exported under a private name. In this case, rather than adding a completely new export to the entry point, we should create an export that aliases the private name back to the original public name. This is important when the typings files have been rolled-up using a tool such as the [API Extractor](https://api-extractor.com/). In this case the internal type of an aliased private export will be removed completely from the typings file, so there is no "original" type to re-export. For example: If there are the following TS files: **entry-point.ts** ```ts export {Internal as External} from './internal'; ``` **internal.ts** ```ts export class Internal { foo(): void; } ``` Then the API Extractor might roll up the .d.ts files into: ```ts export declare class External { foo(): void; } ``` In this case ngcc should add an export so the file looks like: ```ts export declare class External { foo(): void; } export {External as Internal}; ``` PR Close #28735
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