Require non-empty directive locations #4100
Merged
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A proposed spec edit clarifies a requirement that was always true but was slightly buried: directive definitions must include 1 or more locations.
This PR adds explicit validation to graphql-js around non-empty directive locations. Similar work was landed in graphql-java.
I'll add that I haven't contributed to graphql-js before and am not familiar with typescript or the mores of graphql-js. I've tried to follow existing patterns but would appreciate any feedback offered.