Function nullableShape

Example

import {nullableShape, checkValidShape, defineShape} from 'object-shape-tester';

const myShape = defineShape({
    a: '',
    b: nullableShape(-1),
});

checkValidShape({a: 'hi', b: 0}, myShape); // `true`
checkValidShape({a: 'hi', b: undefined}, myShape); // `true`
checkValidShape({a: 'hi', b: null}, myShape); // `true`
checkValidShape({a: 'hi'}, myShape); // `true`
checkValidShape({b: 0}, myShape); // `false`
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