TypeScript Error Decoder

TS2345 is 'Argument of type X is not assignable to parameter of type Y'. It appears when you pass a value to a function that expects a different type — for example, passing a string to a function that expects a number. Fix by ensuring the types match, adding a type assertion, or widening the function's parameter type.

TS2304 is 'Cannot find name X'. TypeScript cannot find the declaration for a variable, function, or type. Common causes: missing import, wrong variable name, missing @types package, or forgot to declare a global. Fix by importing the symbol, installing the type package (e.g., @types/node), or adding a declaration file.

TS7006 means a function parameter has no type annotation and TypeScript infers it as 'any' in strict mode. This is an error when noImplicitAny is enabled (part of strict: true). Fix by adding an explicit type annotation to the parameter: (x: string) => ... or (item: MyType) => ...

TS2307 means TypeScript cannot find the module you're importing. Causes: wrong path, missing @types package, the package has no type declarations, or moduleResolution is misconfigured. For npm packages without built-in types, install @types/package-name. For packages with no types at all, add declare module 'package-name' in a .d.ts file.

Use // @ts-ignore on the line before to suppress the error on the next line. Use // @ts-expect-error to suppress AND be warned if the error disappears (safer). Use // @ts-nocheck at the top of a file to disable TypeScript for the whole file. Prefer fixing the underlying type issue rather than suppressing.