TS2355 — Function Must Return a Value

导致此错误的原因

The function signature specifies a return type, but some execution paths reach the end of the function without returning a value. Conditional branches may not all have return statements.

如何修复

Add return statements to all code paths. If the function can legitimately return nothing, change the return type to include undefined or void. Check all branches of if/else and switch statements.

function getName(): string {
  // missing return
}