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React Academy · Lesson

Dev/Prod Builds, Source Maps, Envs

Understand dev vs prod builds, what source maps are for, and how env values guide behavior (e.g., API URL, debug).

Dev/Prod Builds, Source Maps, Envs is a free React Academy lesson on CoddyKit — lesson 1 of 3. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the React Academy learning path, one of 3 lessons in the course, and your progress syncs across the web and the CoddyKit app.

Why builds, maps, envs?

Goal: Know the difference between development and production builds, the role of source maps, and basic env usage.

  • Dev: fast feedback, verbose
  • Prod: optimized, quiet
  • Source maps: debug original code

Snapshot of terms

  • Dev build: HMR/hot reload, clear errors
  • Prod build: minified, dead-code removed
  • Source map: link minified output to sources
  • Env: configure API URL, flags

Demo: mode badge + dev log

A small mode badge; dev-only logging is allowed when mode is development.

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Demo: debug-only UI by mode

Show a tiny debug panel only in development. In prod, it disappears.

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Demo: env values for behavior

Read env-like values (simulated) to pick API URL and toggle features.

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Tips & pitfalls

  • Keep logs and debug UI out of prod
  • Generate source maps for safe debugging (keep them private)
  • Use env to switch URLs and features

Prod build basics check

What is typically true for a production build compared to a development build?

Recap

Recap: Dev builds are friendly and verbose; prod builds are optimized. Source maps connect minified code to originals, and env values steer URLs and feature flags.

Frequently asked questions

Is the “Dev/Prod Builds, Source Maps, Envs” lesson free?

Yes — the full text of “Dev/Prod Builds, Source Maps, Envs” is free to read here on the web, and the React Academy course includes 3 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the React Academy course, upgrade to CoddyKit PRO.

What will I learn in “Dev/Prod Builds, Source Maps, Envs”?

Understand dev vs prod builds, what source maps are for, and how env values guide behavior (e.g., API URL, debug). You practise React Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start React Academy?

No prior experience is required. React Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 3, so you can start here or from the beginning and move at your own pace.

How long does the “Dev/Prod Builds, Source Maps, Envs” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this React Academy lesson?

Yes. Every React Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Dev/Prod Builds, Source Maps, Envs
  2. Bundle Analysis & Trimming Unused Code
  3. Basic CI: Lint → Test → Build
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