tests/cases/compiler/propertyAssignment.ts(6,13): error TS1170: Computed property names are not allowed in type literals. tests/cases/compiler/propertyAssignment.ts(14,1): error TS2322: Type '{ x: number; }' is not assignable to type 'new () => any'. tests/cases/compiler/propertyAssignment.ts(16,1): error TS2322: Type '{ x: number; }' is not assignable to type '() => void'. ==== tests/cases/compiler/propertyAssignment.ts (3 errors) ==== var foo1: { new ():any; } var bar1: { x : number; } var foo2: { [index]; } // should be an error ~~~~~~~ !!! error TS1170: Computed property names are not allowed in type literals. var bar2: { x : number; } var foo3: { ():void; } var bar3: { x : number; } foo1 = bar1; // should be an error ~~~~ !!! error TS2322: Type '{ x: number; }' is not assignable to type 'new () => any'. foo2 = bar2; foo3 = bar3; // should be an error ~~~~ !!! error TS2322: Type '{ x: number; }' is not assignable to type '() => void'.