File: intersectionSatisfiesConstraint.ts

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// @strict: true
// @lib: esnext

interface FirstInterface {
    commonProperty: number
}

interface SecondInterface {
    commonProperty: number
}

const myFirstFunction = <T extends FirstInterface | SecondInterface>(param1: T) => {
    const newParam: T & { otherProperty: number } = Object.assign(param1, { otherProperty: 3 })
    mySecondFunction(newParam)
}

const mySecondFunction = <T extends { commonProperty: number, otherProperty: number }>(newParam: T) => {
    return newParam
}