GraphQLDependency.isEmptyArg() method

Reports whether a filter assembled for a loader has nothing left to look up, so the loader can be skipped.

Signature:

static isEmptyArg(filter: any): boolean;

Parameters

Returns:

boolean

true when there is nothing left to fetch

Remarks

This is the test that keeps a query from making pointless round trips: once the ids already in the request's resolution cache have been removed from a filter, what remains may be nothing at all, and the dependency is then satisfied from the cache instead of by a call.

"Empty" is looser than falsy, and worth knowing precisely if you write your own filters. An array is empty when it has no elements. A plain object is empty when every one of its own properties is either falsy or an empty array — so {} and { ids: [] } both count as empty, while { ids: [1] } does not. Anything else is empty when it is falsy.

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