typescript type_error ai_generated true

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

ID: typescript/ts7006-implicitly-any

Also available as: JSON · Markdown
95%Fix Rate
92%Confidence
200Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
5 active — — —

Root Cause

TypeScript strict mode requires explicit types. Very common when enabling strict for the first time.

generic

Workarounds

  1. 95% success Add proper type annotations to function parameters 
    function greet(name: string): void { }

    Sources: https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#parameter-type-annotations

  2. 88% success Use type inference where possible (let TypeScript infer from usage) 
    // Add explicit types to function parameters:
function handleEvent(event: React.ChangeEvent<HTMLInputElement>) {
  console.log(event.target.value);
}
// For callbacks:
const items = data.map((item: ItemType) => item.name);
// For event handlers:
element.addEventListener('click', (e: MouseEvent) => { });

    Sources: https://www.typescriptlang.org/docs/handbook/type-inference.html

Dead Ends

Common approaches that don't work:

  1. Disable strict mode in tsconfig.json 85% fail

    Loses all the safety benefits of TypeScript strict mode

  2. Add : any to every parameter 82% fail

    Removes type safety, making TypeScript equivalent to JavaScript

Error Chain

Leads to:
Preceded by:
Frequently confused with: