TypeScript Version: 3.5.2
Search Terms: undefined, function arguments, variable, if condition, static code analysis
Code
const foo = (bar: number) => {};
const someOtherFunction = (bar?: number) => {
const shouldCallFoo = !!bar;
if (shouldCallFoo) {
foo(bar);
}
}Expected behavior:
The code compiles without any problems
Actual behavior:
Error:
Argument of type 'number | undefined' is not assignable to parameter of type 'number'.
Type 'undefined' is not assignable to type 'number'.
Playground Link: http://www.typescriptlang.org/play/#code/MYewdgzgLgBAZiEMC8MAUAjAhgJwFwxgCuAthgKY4CUKAfDAN4C+A3AFBuiSwQgnkB5KAAtKAMSJhgUAJbgU6bDgD8BYmUo1k9Bmxj6YXaDAjCQRADYATAMJYLFsYgVL2egzLjpT563YdOIDS6BqHwiJi4VOyhTGxMQA
Related Issues:
TypeScript Version: 3.5.2
Search Terms: undefined, function arguments, variable, if condition, static code analysis
Code
Expected behavior:
The code compiles without any problems
Actual behavior:
Error:
Playground Link: http://www.typescriptlang.org/play/#code/MYewdgzgLgBAZiEMC8MAUAjAhgJwFwxgCuAthgKY4CUKAfDAN4C+A3AFBuiSwQgnkB5KAAtKAMSJhgUAJbgU6bDgD8BYmUo1k9Bmxj6YXaDAjCQRADYATAMJYLFsYgVL2egzLjpT563YdOIDS6BqHwiJi4VOyhTGxMQA
Related Issues: