Is there a way to define the parameters for a Map in such a manner that each key is linked to a value containing the key as a specific property's value? To clarify, consider this example:
const example = {
'a': {
specialKey: 'a',
aField: 'specific thing to a'
},
'b': {
specialKey: 'b',
bField: 'specific thing to b'
}
}
In the provided example, I aim to specify that for the key a, the value of specialKey should be a.
An effective way to establish a key-value type relationship similar to what you've described in your inquiry is by implementing an identity function.
function validMap <T extends {
[K in keyof T]: K extends string ? { specialKey: K } : never;
}> (value: T): T {
return value;
}
const map1 = validMap({
a: {
specialKey: 'a',
},
b: {
specialKey: 'b',
stringProp: 'foo',
numberProp: 42,
},
});
const map2 = validMap({
a: {
specialKey: 'a',
},
b: {
specialKey: 'c',
// ^^^^^^^^^^
// Type '"c"' is not assignable to type '"b"'.(2322)
stringProp: 'foo',
numberProp: 42,
},
});
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