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Introduce way to type narrow a string property

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Co-authored-by: Janne Savolainen <janne.savolainen@live.fi>

Signed-off-by: Iku-turso <mikko.aspiala@gmail.com>
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Iku-turso 2022-10-06 12:53:03 +03:00 committed by Janne Savolainen
parent cf9bf23ac5
commit a811b0948f
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9
src/common/utils/type-narrowing.ts
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@ -35,6 +35,15 @@ export function hasTypedProperty<S extends object, K extends PropertyKey, V>(val
return hasOwnProperty(val, key) && isValid(val[key]); return hasOwnProperty(val, key) && isValid(val[key]);
} }
/**
* Narrows `val` to include the property `key` with type string
* @param val the value that we are trying to type narrow
* @param key The key to test if it is present on the object (must be a literal for tsc to do any meaningful typing)
*/
export function hasStringProperty<S extends object, K extends PropertyKey>(val: S, key: K): val is (S & { [key in K]: string }) {
return hasOwnProperty(val, key) && isString(val[key]);
}
/** /**
* Narrows `val` to include the property `key` with type `V | undefined` or doesn't contain it * Narrows `val` to include the property `key` with type `V | undefined` or doesn't contain it
* @param val the value that we are trying to type narrow * @param val the value that we are trying to type narrow