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TypeScript Academy · Lesson

Enforcing strict flags gradually

Enable TypeScript strict flags step by step; update code with annotations and guards until fully strict mode is possible.

Intro

Goal: Increase strictness progressively. You will learn what each flag does, how to enable them safely, and how to resolve errors without disabling checks.

Strict flags overview

Main flags:

  • noImplicitAny: require type annotations instead of inferred any
  • strictNullChecks: must handle null/undefined explicitly
  • noImplicitThis: this must be typed
  • alwaysStrict: parse files in strict mode

All lessons in this course

  1. Eliminating any; preferring unknown + narrowing
  2. Enforcing strict flags gradually
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