TypeScript Modules

Two files that never import each other can still conflict. Consider these two small files, compiled together:

// file: mathOperations.ts
function add(a: number, b: number): number {
    return a + b;
}

// file: labels.ts
function add(a: string, b: string): string {
    return a + " " + b;
}

labels.ts(2,10): error TS2393: Duplicate function implementation.
mathOperations.ts(2,10): error TS2393: Duplicate function implementation.

The compiler treats a file with no top-level import or `export