typescript - intersection type

If you want to defined your type which contains intersection of properties but nothing else then you can use & operator.

In this example we define, CrazyMix which must defined bread, crust, size properties.
If we introduce another property, then we will get an error.

interface IPizza {

crust : string,

size : number

}

interface ISandwich {

bread : string

size : number

}

type MixFood = IPizza & ISandwich

const CrazyMix : MixFood = {

bread : 'i want ',

crust : 'test',

size : 100

}

const CrazyMix : MixFood = {

bread : 'i want ',

crust : 'test',

size : 100

rating : 10 // ERROR

}