TS7006 🟦 TypeScript

TS7006: Parameter 'x' implicitly has an 'any' type

A function parameter has no type annotation and TypeScript can’t infer one, which noImplicitAny (part of strict) forbids.

Seen on: TypeScript

Meaning

Callbacks passed to untyped libraries, event handlers defined separately from where they’re used, and functions in newly converted JS files trigger it.

Common causes

  • Function parameter without annotation in strict mode
  • Callback for a library without type declarations
  • Handler declared separately from its usage (no contextual typing)

⚡ Quick fix

  1. Add a type annotation
  2. Install @types/<library> for contextual types
  3. Use the framework’s event types (React.ChangeEvent<HTMLInputElement>)

Detailed fix by platform

TypeScript

  1. typescript
    function onChange(e: React.ChangeEvent<HTMLInputElement>) { setValue(e.target.value); }
const total = items.reduce((sum: number, i: Item) => sum + i.price, 0);

How to diagnose

  1. Parameter — Which one?
  2. Types — @types package available?

🔧 Still not fixed?

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