I am encountering an issue with an object structure similar to the one below:
let Obj = {
['0'] : {
mode: 'x'
},
getMode: () => 'x'
}
The problem arises when I attempt to create a type definition as shown here:
type Obj = {
[id: string]: {
mode: string
};
getMode: () => string
}
Specifically, I am receiving this error message -- "Property 'getMode' of type '() => string' is not assignable to 'string' index type '{ mode: string}'. ts(2411)"
When using index signatures, it is important to specify the other type associated with that signature.
type Data = {
[key: string]: { category: string} | (() => string);
}
let dataExample: Data = {
['example']: {
category: 'test'
},
getCategory: () => 'test'
}
Initially, it may seem contradictory, but what you have are two distinct definitions for the function getMode that cannot coexist together.
Inside the data type Obj, there are the following components:
[id: string] indicating "any string key should follow this structure" (specifically { mode: string })getMode with a value of type () => stringSince the first definition applies to all string keys, it conflicts with the second definition. Essentially, since getMode is a string key, it must also adhere to the constraints of [id: string], which means it should be of type { mode: string }.
This concept and potential solutions are discussed in more detail in related Stack Overflow posts like this one
When utilizing a general key with { mode: string } type, it's important to ensure that all properties defined with a string key type (including getMode) also have a value type of { mode: string }. One method to separate the getMode from general keys is by segmenting your Obj type into two distinct parts:
type GetModeType = {
getMode: () => string;
};
type GeneralType<T extends string> = {
[P in T as T extends "getMode" ? never : P]: { mode: string };
};
Afterwards, you can create a generic type based on their intersection:
type Obj<T extends string> = GetModeType & GeneralType<T>;
You can then proceed to create an object based on the Obj type:
const obj: Obj<"0" | "pending"> = {
getMode: () => "hello",
["0"]: { mode: "zero" },
pending: { mode: "this is pending mode." },
};
It's worth noting that the Obj type includes a property of getMode with the type () => string, and any other desired keys should be specified as a generic type (union of string literals).
For more information on generic types and mapped types, refer to the TypeScript documentation.
Within the realm of Typescript, the expression [key: string]: type conveys that every key within the object must adhere to that specified type. One way to address this is by utilizing intersection.
type CustomObj = {
[id: string]: {
mode: string
};
} & {
getMode: () => string
}
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