index.ts is not part of the compilation output
I had a similar issue with angular-bootstrap-md\index.ts
how I could fix it:
Just put the index.ts file to the tsconfig.jsons include block , see below:
{ "compileOnSave": false, "compilerOptions": { "outDir": "./dist/out-tsc", "sourceMap": true, "declaration": false, "moduleResolution": "node", "emitDecoratorMetadata": true, "experimentalDecorators": true, "target": "es5", "typeRoots": [ "node_modules/@types" ], "lib": [ "es2017", "dom" ] }, "include": [ "src/**/*", "node_modules/angular-bootstrap-md/index.ts" ] }
Source: https://github.com/angular/angular/issues/20091