How can I determine the data type of an Array element contained within an Interface member?

Is there a way to extract the type of key3 in MyInterface2 and use it in key3Value, similar to key2Value?

interface MyInterface {
    key1: {
        key2: string
    }
}

const key2Value: MyInterface['key1']['key2'] = 'Hi' //Operates correctly

interface MyInterface2 {
    key1: {
        key2: Array<{ key3: string }>
    }
}

const key3Value: MyInterface2['key1']['key2']['key3'] = 'Hi' //Error: Property 'key3' does not exist on type '{ key3: string; }[]'.(2339)

Link to typescript playground.

arraystypescripttypes

Answer №1

Adding an index is necessary in order to access the specific value within the array:

const desiredValue: MyInterface2['key1']['key2'][0]['key3'] = 'Hello'

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