← Errors
TypeScript error TS7006 is reported when a function parameter has no type annotation and TypeScript cannot infer its type, so it would default to 'any'. With noImplicitAny enabled (included in strict mode), TypeScript rejects this because 'any' disables type checking.
Why it happens
- •A function parameter is declared without a type annotation.
- •A variable is declared with let or const without an annotation and no initializer.
- •A callback parameter is not typed and TypeScript cannot infer it from context.
Examples
JavaScript
Code that triggers the error
// tsconfig: "strict": true
function greet(name) {
return "Hello, " + name;
}Error output
error TS7006: Parameter 'name' implicitly has an 'any' type.
How to fix it
Add explicit type annotations to all function parameters. Enable TypeScript's strict mode to catch these issues early. If the type is genuinely unknown, prefer 'unknown' over 'any' and narrow it with type guards before use.
Fixed code
function greet(name: string): string {
return "Hello, " + name;
}Related errors
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