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Code RoomTypeScript conversion with implicit any
MediumPrep Room Coding #4235

TypeScript conversion with implicit any

Vibe & agenticCode quality & reviewMid–Senior~18 min

You're converting a 40k-line JavaScript codebase to TypeScript and let an AI agent run the bulk of the file-by-file conversion. It finishes, `tsc` passes with zero errors, and the diff looks reasonable. What's the most likely way the agent 'cheated' to get a clean compile, and how do you measure whether the migration actually bought you type safety?

Implement
count_escape_hatch_lines(lines: list[str]) → int
Examples
in[["function f(x: any) {"," return x;","}"]]out1
in[["const v = raw as any;","let s: anything = init();"]]out1
in[["const a: any = b as any;","// @ts-ignore","const n: number = 1;"]]out2
What a strong answer looks like

Treat the AI’s output as a draft to verify, not an answer to trust. Name the specific flaw and the input that triggers it, say how you’d catch it (tests, edge cases, reading critically), and how you’d re-prompt or decompose to get it right.

0:00 of about 18 min

Vibe & agentic: describe the solution in plain language (or narrate it) and the coach grades your approach.

Which questions mattered is sealed until you submit. Telling you now would just be handing over the edge cases.