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tests/cases/compiler/widenedTypes.ts(1,1): error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
tests/cases/compiler/widenedTypes.ts(4,1): error TS18050: The value 'null' cannot be used here.
tests/cases/compiler/widenedTypes.ts(5,7): error TS18050: The value 'null' cannot be used here.
tests/cases/compiler/widenedTypes.ts(9,14): error TS2695: Left side of comma operator is unused and has no side effects.
tests/cases/compiler/widenedTypes.ts(10,1): error TS2322: Type 'string' is not assignable to type 'number'.
tests/cases/compiler/widenedTypes.ts(17,1): error TS2322: Type 'string' is not assignable to type 'number'.
tests/cases/compiler/widenedTypes.ts(22,22): error TS2322: Type 'number' is not assignable to type 'string'.
tests/cases/compiler/widenedTypes.ts(23,39): error TS2322: Type 'number' is not assignable to type 'string'.
==== tests/cases/compiler/widenedTypes.ts (8 errors) ====
null instanceof (() => { });
~~~~
!!! error TS2358: The left-hand side of an 'instanceof' expression must be of type 'any', an object type or a type parameter.
({}) instanceof null; // Ok because null is a subtype of function
null in {};
~~~~
!!! error TS18050: The value 'null' cannot be used here.
"" in null;
~~~~
!!! error TS18050: The value 'null' cannot be used here.
for (var a in null) { }
var t = [3, (3, null)];
~
!!! error TS2695: Left side of comma operator is unused and has no side effects.
t[3] = "";
~~~~
!!! error TS2322: Type 'string' is not assignable to type 'number'.
var x: typeof undefined = 3;
x = 3;
var y;
var u = [3, (y = null)];
u[3] = "";
~~~~
!!! error TS2322: Type 'string' is not assignable to type 'number'.
var ob: { x: typeof undefined } = { x: "" };
// Highlights the difference between array literals and object literals
var arr: string[] = [3, null]; // not assignable because null is not widened. BCT is {}
~
!!! error TS2322: Type 'number' is not assignable to type 'string'.
var obj: { [x: string]: string; } = { x: 3, y: null }; // assignable because null is widened, and therefore BCT is any
~
!!! error TS2322: Type 'number' is not assignable to type 'string'.
!!! related TS6501 tests/cases/compiler/widenedTypes.ts:23:12: The expected type comes from this index signature.
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