tests/cases/compiler/stringIndexerAssignments1.ts(5,1): error TS2322: Type '{ one: number; two: string; }' is not assignable to type '{ [index: string]: string; one: string; }'.
Types of property 'one' are incompatible.
Type 'number' is not assignable to type 'string'.
==== tests/cases/compiler/stringIndexerAssignments1.ts (1 errors) ====
var x: { [index: string]: string; one: string; };
var a: { one: string; };
var b: { one: number; two: string; };
x = a;
x = b; // error
~
!!! error TS2322: Type '{ one: number; two: string; }' is not assignable to type '{ [index: string]: string; one: string; }'.
!!! error TS2322: Types of property 'one' are incompatible.
!!! error TS2322: Type 'number' is not assignable to type 'string'.
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