BestPromptFinder

Convert a JavaScript Project to TypeScript Step by Step

Quality, usefulness and confidence are AI evaluations out of 100 — not user ratings. Community results come from visitors' "worked / didn't work" votes below. How scoring works →

The prompt

Help me move this JavaScript project to TypeScript gradually, without breaking it. Project: [framework, bundler, test runner, Node version, rough size] Pain points: [e.g. lots of untyped API responses, shared utils used everywhere] 1. Setup: the tsconfig settings to start with (allowJs, checkJs off at first, strict off then on), and build and test changes. 2. Order: which files to convert first (leaf utilities, then shared types, then components or routes), and why. 3. For the file I paste next, convert it: add types, replace any with real types where you can, and list each place you had to guess as [CHECK]. 4. How to type API responses and third-party libraries without types. 5. A checklist to run after each step: type check, tests, app starts. Don't change behaviour or rename things while converting. Tell me to run the tests and report failures rather than assuming they pass.

Why this prompt

• Hand-picked, editorially reviewed prompt
• Written for Claude Code, Codex, Cursor, ChatGPT

Source

Created by BestPromptFinder — editorial prompt, not user-generated. See our content & source policy.

Related Coding prompts