When working with typescript, how can I define the type signature for a plain old javascript object that allows any key, but restricts the values to strings only? For example, {a:"foo"} and {b:"bar"} are considered valid values, while {a:[1,2,3]} and {b:3} are not.
I'm looking to write something similar to
let foo : {*: string} = {a: "foo"}
Currently, my workaround involves using any, but I would prefer a more precise solution.
If you want to ensure that all values in a type are strings, you can define an index signature like this:
type StringValues = { [key: string]: string };
For example:
type StringValues = { [key: string]: string };
const obj: StringValues = {
"example": "some text", // valid
anotherKey: "more text", // valid
thirdKey: 123 // Error - value must be a string
};
Upon reviewing, it seems like you are examining an enum definition for your property values.
You might declare it in this manner:
let options: { [key: string]: 'option1' | 'option2' | 'option3' };
options.a = 'option1';
options.b = 'option3';
options.c = 'option2';
options.d = 'option2'; // triggers an error
To visualize this concept, you can refer to this TypeScript playground example.
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