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JavaScript

What is a TS2304: Cannot Find Name?

← Errors

TypeScript error TS2304 is reported when an identifier is used but TypeScript cannot find a declaration for it in the current scope. This is the TypeScript equivalent of a ReferenceError and is caught at compile time.

Why it happens

  • •A function, variable, or type is used without being imported or declared.
  • •A global type (like window, document, or process) is used without the appropriate @types package.
  • •A type from a third-party library is used without installing @types for that library.
  • •A typo in the identifier name.

Examples

JavaScript

Code that triggers the error

const result = add(2, 3); // 'add' not imported

Error output

error TS2304: Cannot find name 'add'.

How to fix it

Import the identifier from the correct module. Install the relevant @types package for missing globals. Check for typos in names. Configure your tsconfig.json lib or types array to include the environment globals you need.

Fixed code

import { add } from "./math";

const result = add(2, 3);

Related errors

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