tests/cases/conformance/es6/computedProperties/computedPropertyNamesContextualType10_ES6.ts(5,5): error TS2322: Type '{ [x: number]: string | number; }' is not assignable to type 'I'. Index signatures are incompatible. Type 'string | number' is not assignable to type 'boolean'. Type 'string' is not assignable to type 'boolean'. ==== tests/cases/conformance/es6/computedProperties/computedPropertyNamesContextualType10_ES6.ts (1 errors) ==== interface I { [s: number]: boolean; } var o: I = { ~ !!! error TS2322: Type '{ [x: number]: string | number; }' is not assignable to type 'I'. !!! error TS2322: Index signatures are incompatible. !!! error TS2322: Type 'string | number' is not assignable to type 'boolean'. !!! error TS2322: Type 'string' is not assignable to type 'boolean'. [+"foo"]: "", [+"bar"]: 0 }