hasproperty-ts

If the object property check is successful, the object type including the target property is generated.

If you do not use this package

``ts
function Test(x:unknown){
if(x instanceof Object && "foo" in x){
console.log(x.foo); //Error
console.log((<{foo:unknown}>x).foo); //OK(Cast required)
}
}
`

When using this package

`ts
import {hasProperty} from "hasproperty-ts";

function Test(x: unknown) {
if (hasProperty(x, "foo")) {
console.log(x.foo); //TypeScript Type OK
}

if (hasProperty2(x, "foo", "bar")) {
console.log(x.foo); //TypeScript Type OK
console.log(x.bar); //TypeScript Type OK
}
}
``