46 lines
1.9 KiB
Plaintext
46 lines
1.9 KiB
Plaintext
==== tests/cases/conformance/expressions/binaryOperators/additionOperator/additionOperatorWithUndefinedValueAndInvalidOperands.ts (11 errors) ====
|
|
// If one operand is the null or undefined value, it is treated as having the type of the other operand.
|
|
|
|
function foo(): void { return undefined }
|
|
|
|
var a: boolean;
|
|
var b: Object;
|
|
var c: void;
|
|
var d: Number;
|
|
|
|
// undefined + boolean/Object
|
|
var r1 = undefined + a;
|
|
~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'boolean' and 'boolean'.
|
|
var r2 = undefined + b;
|
|
~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'Object' and 'Object'.
|
|
var r3 = undefined + c;
|
|
~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'void' and 'void'.
|
|
var r4 = a + undefined;
|
|
~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'boolean' and 'boolean'.
|
|
var r5 = b + undefined;
|
|
~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'Object' and 'Object'.
|
|
var r6 = undefined + c;
|
|
~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'void' and 'void'.
|
|
|
|
// other cases
|
|
var r7 = undefined + d;
|
|
~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'Number' and 'Number'.
|
|
var r8 = undefined + true;
|
|
~~~~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'boolean' and 'boolean'.
|
|
var r9 = undefined + { a: '' };
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types '{ a: string; }' and '{ a: string; }'.
|
|
var r10 = undefined + foo();
|
|
~~~~~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types 'void' and 'void'.
|
|
var r11 = undefined + (() => { });
|
|
~~~~~~~~~~~~~~~~~~~~~~~
|
|
!!! Operator '+' cannot be applied to types '() => void' and '() => void'. |