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tests/cases/conformance/types/typeRelationships/assignmentCompatibility/optionalPropertyAssignableToStringIndexSignature.ts(6,1): error TS2322: Type '{ k1: string | undefined; }' is not assignable to type '{ [key: string]: string; }'.
Property 'k1' is incompatible with index signature.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/optionalPropertyAssignableToStringIndexSignature.ts(10,1): error TS2322: Type '{ 1?: string | undefined; }' is not assignable to type '{ [key: number]: string; }'.
Property '1' is incompatible with index signature.
Type 'string | undefined' is not assignable to type 'string'.
Type 'undefined' is not assignable to type 'string'.
tests/cases/conformance/types/typeRelationships/assignmentCompatibility/optionalPropertyAssignableToStringIndexSignature.ts(13,5): error TS2322: Type '{ k1?: undefined; }' is not assignable to type '{ [key: string]: string; }'.
Property 'k1' is incompatible with index signature.
Type 'undefined' is not assignable to type 'string'.
==== tests/cases/conformance/types/typeRelationships/assignmentCompatibility/optionalPropertyAssignableToStringIndexSignature.ts (3 errors) ====
declare let optionalProperties: { k1?: string };
declare let undefinedProperties: { k1: string | undefined };
declare let stringDictionary: { [key: string]: string };
stringDictionary = optionalProperties; // ok
stringDictionary = undefinedProperties; // error
~~~~~~~~~~~~~~~~
!!! error TS2322: Type '{ k1: string | undefined; }' is not assignable to type '{ [key: string]: string; }'.
!!! error TS2322: Property 'k1' is incompatible with index signature.
!!! error TS2322: Type 'string | undefined' is not assignable to type 'string'.
!!! error TS2322: Type 'undefined' is not assignable to type 'string'.
declare let probablyArray: { [key: number]: string };
declare let numberLiteralKeys: { 1?: string };
probablyArray = numberLiteralKeys; // error
~~~~~~~~~~~~~
!!! error TS2322: Type '{ 1?: string | undefined; }' is not assignable to type '{ [key: number]: string; }'.
!!! error TS2322: Property '1' is incompatible with index signature.
!!! error TS2322: Type 'string | undefined' is not assignable to type 'string'.
!!! error TS2322: Type 'undefined' is not assignable to type 'string'.
declare let optionalUndefined: { k1?: undefined };
let dict: { [key: string]: string } = optionalUndefined; // error
~~~~
!!! error TS2322: Type '{ k1?: undefined; }' is not assignable to type '{ [key: string]: string; }'.
!!! error TS2322: Property 'k1' is incompatible with index signature.
!!! error TS2322: Type 'undefined' is not assignable to type 'string'.
function f<T>() {
let optional: { k1?: T } = undefined!;
let dict: { [key: string]: T | number } = optional; // ok
}
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