Is it possible for TypeScript compiler to detect errors in code such as this, with certain tsconfig rules in place?
function buildName(firstName: string, lastName?: string) {
return firstName + " " + lastName;
}
I believe that if there is no check in the code ensuring that lastName is not undefined, TypeScript should throw a compilation error. How can I configure tsc to catch this error during compilation?
Combining a variable with the value of undefined may seem strange, but it is allowed in JavaScript without triggering a TypeScript error.
However, this practice is usually undesired and can indicate an underlying issue. The TSLint rule restrict-plus-operands along with the corresponding ESLint rule forbid this behavior:
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