feature-toggle-package/dist/service/feature-toggle.service.js

A lightweight and flexible feature toggle (feature flag) implementation for JavaScript/TypeScript applications

import { ModuleError, SubmoduleError } from '../types/errors.js';
export class FeatureToggleService {
    isEnabled(config, moduleName, submoduleName, featureName) {
        const module = config.modules[moduleName];
        if (!module) {
            throw new ModuleError(`Module "${moduleName}" not found`);
        }
        if (!module.enabled)
            return false;
        if (!submoduleName)
            return true;
        if (!module.submodules)
            return false;
        const submodule = module.submodules[submoduleName];
        if (!submodule) {
            throw new SubmoduleError(`Submodule "${submoduleName}" not found in module "${moduleName}"`);
        }
        if (!submodule.enabled)
            return false;
        if (!featureName)
            return true;
        return Boolean(submodule.features?.[featureName] ?? false);
    }
}