short-night | : deciduous_tree : An engine for drawing timeline graph

Remove the 's from the command and it should work. Generally you don't need to manually pass file paths to the tslint command if you also pass a --project, as it'll pick up paths from the project.

Using Path mapping in tsconfig.json is the right way to go. And you have it set up already. But the issue is that you have your TypeScript files located in the parent folder of the directory where tsconfig.json resides. So the only .ts file included in your tsconfig.json is develop/main.ts. From https://www.typescriptlang.org/docs/handbook/tsconfig-json.html: