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typescript

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

A function parameter lacks a type annotation and TypeScript can't infer its type from context. With noImplicitAny or strict enabled in tsconfig.json, TypeScript requires you to explicitly annotate parameters rather than silently treating them as any.

Common causes

Writing a function parameter without a type annotation: function fn(x) — x is implicitly any
strict: true or noImplicitAny: true is set in tsconfig.json
Callback functions passed to methods where TypeScript can't infer the parameter type from context
Migrating JavaScript code to TypeScript without adding type annotations

How to fix it

Add a type annotation to the parameter: function fn(x: string) { ... }
If you genuinely need any, annotate it explicitly: function fn(x: any) — this is intentional
Use a generic if the type varies: function fn<T>(x: T) { ... }
Set noImplicitAny: false in tsconfig.json to disable this check (not recommended for new projects)

Example

function double(x) {
  return x * 2;
}
// error TS7006: Parameter 'x' implicitly has an 'any' type.

Function parameter without a type annotation with noImplicitAny enabled

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