@pylonsync/feature-flags

bun add @pylonsync/feature-flags

import { isEnabled, getVariant, evaluateAll } from "@pylonsync/feature-flags";

const flags = {
  "new-onboarding": {
    type: "boolean",
    default: true,
    rollout: { percent: 25 },
    targeting: [
      { value: true, when: [{ property: "plan", op: "eq", value: "enterprise" }] },
    ],
  },
  "ai-model": {
    type: "multivariate",
    default: "gpt-4",
    variants: [
      { name: "gpt-4",   weight: 80, payload: { maxTokens: 4096 } },
      { name: "claude-opus", weight: 20, payload: { maxTokens: 8192 } },
    ],
  },
} as const;

const ctx = { userId: "u_42", properties: { plan: "pro" } };
isEnabled(flags, "new-onboarding", ctx); // boolean
getVariant(flags, "ai-model", ctx);      // "gpt-4" | "claude-opus"
evaluateAll(flags, ctx);                 // { "new-onboarding": true, "ai-model": {maxTokens: 4096} }