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Dev.to
6/28/2026
How to Use the any Type and When to Avoid It

How to Use the any Type and When to Avoid It

Short summary

The TypeScript `any` type silently disables type checking, allowing runtime errors to pass undetected in production. Learn why `any` spreads type-safety vulnerabilities through codebases, how `unknown` provides a safer alternative with type guards, and when to use each.

  • any disables TypeScript checking entirely, allowing bugs to reach runtime undetected
  • unknown is safer—it requires type guards before use, maintaining type safety
  • only use any for legacy JS migration or untyped libraries; unknown is preferred

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