0d8c0a5ffe
- @bytelyst/backend-flags: createFlagRegistry() with defaults, 6 tests - @bytelyst/backend-telemetry: createTelemetryBuffer() with enabled switch, 5 tests
39 lines
1.1 KiB
TypeScript
39 lines
1.1 KiB
TypeScript
/**
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* In-memory feature flag registry for product backends.
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*
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* Products call createFlagRegistry() with their default flags,
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* then use isFeatureEnabled/getAllFlags/setFlag as needed.
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*/
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export interface FlagRegistry {
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isFeatureEnabled(flag: string, userId?: string): boolean;
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getAllFlags(): Record<string, boolean>;
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setFlag(flag: string, value: boolean): void;
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}
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export interface FlagRegistryOptions {
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/** Default flag values. */
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defaults: Record<string, boolean>;
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/** Master switch — when false, flags are still resolved from defaults but
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* the registry won't attempt remote/dynamic flag resolution (future use). */
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enabled?: boolean;
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}
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export function createFlagRegistry(opts: FlagRegistryOptions): FlagRegistry {
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const flags: Map<string, boolean> = new Map(Object.entries(opts.defaults));
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return {
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isFeatureEnabled(flag: string, _userId?: string): boolean {
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return flags.get(flag) ?? false;
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},
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getAllFlags(): Record<string, boolean> {
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return Object.fromEntries(flags);
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},
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setFlag(flag: string, value: boolean): void {
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flags.set(flag, value);
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},
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};
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}
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