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import { includes, isEqual } from 'lodash';
export default ( options = {} ) => {
const { ignore, deep, shallow } = options;
return ( prevProps, nextProps ) => {
for ( const propName in prevProps ) {
// Skip ignored properties
if ( ignore && includes( ignore, propName ) ) {
continue;
}
// Some properties want to be compared deeply
if ( deep && includes( deep, propName ) ) {
if ( ! isEqual( prevProps[ propName ], nextProps[ propName ] ) ) {
return false;
}
continue;
}
// Compare all other props (or a selected subset) shallowly
if ( ! shallow || includes( shallow, propName ) ) {
if ( prevProps[ propName ] !== nextProps[ propName ] ) {
return false;
}
}
}
// Find properties that are only in `nextProps` and are not ignored.
// Presence of such properties means that the objects are not equal.
for ( const propName in nextProps ) {
if (
! ( propName in prevProps ) &&
! ( ignore && includes( ignore, propName ) ) &&
! ( shallow && ! includes( shallow, propName ) )
) {
return false;
}
}
return true;
};
};
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