Repro for microsoft/TypeScript#47035
After checking out this repository invoke the following commands.
Build project_a
tsc -p project_a/tsconfig.json
Build project_b
tsc -p project_b/tsconfig.json
The following error is thrown
project_a/tsc/main.d.ts:2:36 - error TS2694: Namespace 'w' has no exported member 'IFuseOptions'.
2 export declare type Options = Fuse.IFuseOptions<string>;
~~~~~~~~~~~~
Found 1 error.