Pick only index signatures from the given object type, leaving out all explicitly defined
properties. This is the counterpart of OmitIndexSignature.
Copied from the PickIndexSignature type in the type-fest package so that this package's
public types do not depend on type-fest (see the note in type-checks.ts).
Pick only index signatures from the given object type, leaving out all explicitly defined properties. This is the counterpart of OmitIndexSignature.
Copied from the
PickIndexSignaturetype in thetype-festpackage so that this package's public types do not depend ontype-fest(see the note intype-checks.ts).