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typescript

TS7030: Not all code paths return a value

Your function has branches where it might exit without returning a value, but the function's return type suggests it always returns something. TypeScript found a code path that falls off the end of the function without a return statement.

Common causes

An if/else block that only has a return in the if branch, not the else
A switch statement that doesn't cover all cases and is missing a default return
noImplicitReturns: true or strict mode enabled
An early return that handles one case, with the remaining code path missing a return

How to fix it

Add a return statement to every code path that doesn't already have one
Add a default return at the end of the function as a catch-all
Include undefined in the return type if some paths intentionally return nothing: string | undefined
Refactor the function to have a single clear return path

Example

function getLabel(code: number): string {
  if (code === 1) { return 'one'; }
  // error TS7030: Not all code paths return a value.
}

Function with return type string but only returns in one branch — the default case is missing

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