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tests/cases/compiler/indexerConstraints2.ts(9,5): error TS2413: Numeric index type 'A' is not assignable to string index type 'B'.
tests/cases/compiler/indexerConstraints2.ts(17,5): error TS2413: Numeric index type 'A' is not assignable to string index type 'B'.
tests/cases/compiler/indexerConstraints2.ts(26,5): error TS2413: Numeric index type 'A' is not assignable to string index type 'B'.
tests/cases/compiler/indexerConstraints2.ts(34,6): error TS1336: An index signature parameter type cannot be a type alias. Consider writing '[n: number]: A' instead.
tests/cases/compiler/indexerConstraints2.ts(40,6): error TS1336: An index signature parameter type cannot be a type alias. Consider writing '[s: string]: A' instead.
tests/cases/compiler/indexerConstraints2.ts(46,6): error TS1023: An index signature parameter type must be either 'string' or 'number'.
tests/cases/compiler/indexerConstraints2.ts(52,6): error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
tests/cases/compiler/indexerConstraints2.ts(58,6): error TS1023: An index signature parameter type must be either 'string' or 'number'.
tests/cases/compiler/indexerConstraints2.ts(64,6): error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
tests/cases/compiler/indexerConstraints2.ts(70,6): error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
tests/cases/compiler/indexerConstraints2.ts(74,6): error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
tests/cases/compiler/indexerConstraints2.ts(79,6): error TS1336: An index signature parameter type cannot be a type alias. Consider writing '[key: string]: any' instead.
==== tests/cases/compiler/indexerConstraints2.ts (12 errors) ====
class A { a: number; }
class B extends A { b: number; }
// Inheritance
class F {
[s: string]: B
}
class G extends F {
[n: number]: A
~~~~~~~~~~~~~~
!!! error TS2413: Numeric index type 'A' is not assignable to string index type 'B'.
}
// Other way
class H {
[n: number]: A
}
class I extends H {
[s: string]: B
~~~~~~~~~~~~~~
!!! error TS2413: Numeric index type 'A' is not assignable to string index type 'B'.
}
// With hidden indexer
class J {
[n: number]: {}
}
class K extends J {
[n: number]: A;
~~~~~~~~~~~~~~~
!!! error TS2413: Numeric index type 'A' is not assignable to string index type 'B'.
[s: string]: B;
}
type AliasedNumber = number;
interface L {
[n: AliasedNumber]: A;
~
!!! error TS1336: An index signature parameter type cannot be a type alias. Consider writing '[n: number]: A' instead.
}
type AliasedString = string;
interface M {
[s: AliasedString]: A;
~
!!! error TS1336: An index signature parameter type cannot be a type alias. Consider writing '[s: string]: A' instead.
}
type AliasedBoolean = boolean;
interface N {
[b: AliasedBoolean]: A;
~
!!! error TS1023: An index signature parameter type must be either 'string' or 'number'.
}
type IndexableUnion = "foo" | "bar";
interface O {
[u: IndexableUnion]: A;
~
!!! error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
}
type NonIndexableUnion = boolean | {};
interface P {
[u: NonIndexableUnion]: A;
~
!!! error TS1023: An index signature parameter type must be either 'string' or 'number'.
}
type NonIndexableUnion2 = string | number;
interface Q {
[u: NonIndexableUnion2]: A;
~
!!! error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
}
type NonIndexableUnion3 = "foo" | 42;
interface R {
[u: NonIndexableUnion3]: A;
~
!!! error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
}
interface S {
[u: "foo" | "bar"]: A;
~
!!! error TS1337: An index signature parameter type cannot be a union type. Consider using a mapped object type instead.
}
type Key = string;
interface T {
[key: Key]
~~~
!!! error TS1336: An index signature parameter type cannot be a type alias. Consider writing '[key: string]: any' instead.
}
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