Functions in TypeScript — quiz

You write a test helper: `function calculateTotal(prices) { return prices.reduce((s, p) => s + p, 0) }`. With strict mode on, what does the TypeScript compiler say?

• Compiles fine — TS infers `prices` as `number[]` from how it's used
• Compile error — `prices` has an implicit `any` type because no annotation is provided
• Compiles but logs a warning
• Compiles only if the function is exported