How to use the apollo-env.isNotNullOrUndefined function in apollo-env
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apollographql / apollo-server / packages / apollo-gateway / src / utilities / array.ts View on Github 
(accumulator, element, index, array) => {
const result = callbackfn(element, index, array);
if (isNotNullOrUndefined(result)) {
accumulator.push(result);
}
return accumulator;
},
[] as U[],
