unleash-server/dist/lib/domain/project-health/project-health.js

Unleash is an enterprise ready feature flag service. It provides different strategies for handling feature flags.

import { hoursToMilliseconds } from 'date-fns';
const getPotentiallyStaleCount = (features, featureTypes) => {
    const today = Date.now();
    return features.filter((feature) => {
        const diff = feature.createdAt
            ? today - feature.createdAt.valueOf()
            : 0;
        const featureTypeExpectedLifetime = featureTypes.find((t) => t.id === feature.type)?.lifetimeDays;
        return (!feature.stale &&
            featureTypeExpectedLifetime !== null &&
            featureTypeExpectedLifetime !== undefined &&
            diff >= featureTypeExpectedLifetime * hoursToMilliseconds(24));
    }).length;
};
export const calculateProjectHealth = (features, featureTypes) => ({
    potentiallyStaleCount: getPotentiallyStaleCount(features, featureTypes),
    activeCount: features.filter((f) => !f.stale).length,
    staleCount: features.filter((f) => f.stale).length,
});
export const calculateHealthRating = (features, featureTypes) => {
    const { potentiallyStaleCount, activeCount, staleCount } = calculateProjectHealth(features, featureTypes);
    const toggleCount = activeCount + staleCount;
    const startPercentage = 100;
    const stalePercentage = (staleCount / toggleCount) * 100 || 0;
    const potentiallyStalePercentage = (potentiallyStaleCount / toggleCount) * 100 || 0;
    const rating = Math.round(startPercentage - stalePercentage - potentiallyStalePercentage);
    return rating;
};
export const calculateProjectHealthRating = (featureTypeStore, featureToggleStore) => async ({ id }) => {
    const featureTypes = await featureTypeStore.getAll();
    const toggles = await featureToggleStore.getAll({
        project: id,
        archived: false,
    });
    return calculateHealthRating(toggles, featureTypes);
};
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