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tests/cases/compiler/controlFlowNullTypeAndLiteral.ts(15,12): error TS2345: Argument of type 'null' is not assignable to parameter of type 'number'.
tests/cases/compiler/controlFlowNullTypeAndLiteral.ts(17,12): error TS2345: Argument of type 'null' is not assignable to parameter of type 'number'.
tests/cases/compiler/controlFlowNullTypeAndLiteral.ts(21,15): error TS2322: Type 'null' is not assignable to type 'string'.
==== tests/cases/compiler/controlFlowNullTypeAndLiteral.ts (3 errors) ====
// Repros from #23771
const myNull: null = null;
const objWithValMaybeNull: { val: number | null } = { val: 1 };
const addOne = function (num: number) {
return num + 1;
}
if (objWithValMaybeNull.val !== null)
addOne(objWithValMaybeNull.val);
if (objWithValMaybeNull.val !== myNull)
addOne(objWithValMaybeNull.val);
if (objWithValMaybeNull.val === null)
addOne(objWithValMaybeNull.val); // Error
~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2345: Argument of type 'null' is not assignable to parameter of type 'number'.
if (objWithValMaybeNull.val === myNull)
addOne(objWithValMaybeNull.val); // Error
~~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2345: Argument of type 'null' is not assignable to parameter of type 'number'.
function f(x: number | null) {
if(x === myNull) {
const s: string = x; // Error
~
!!! error TS2322: Type 'null' is not assignable to type 'string'.
}
}
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