@reliance/feature-flags/src/setFeature.js

A package for determining feature flag status based on environment variables or flag objects.

const {
  PredicateNotAFunctionError,
  InvalidFeatureDefinition,
} = require("./error");

const features = {};

function setFeature(featureDefinitions) {
  if (typeof featureDefinitions === "object" && featureDefinitions !== null) {
    for (const [featureName, predicateFn] of Object.entries(
      featureDefinitions
    )) {
      if (typeof predicateFn !== "function") {
        throw new PredicateNotAFunctionError(featureName);
      }
      features[featureName] = predicateFn;
    }
  } else {
    throw new InvalidFeatureDefinition();
  }
}

module.exports = { features, setFeature };