Add bulk evaluation

[dferber90]

Summary

Adds a bulk() function to flags/next for evaluating multiple flags in a single call, plus the underlying adapter and core support that makes it fast.

flags/next

import { bulk } from 'flags/next';
import { flagA, flagB } from '../flags';

// pass a list of flags
const [valueA, valueB] = await bulk([flagA, flagB]);

// pass an object
const { a, b } = await bulk({ a: flagA, b: flagB });

@vercel/flags-core

Adds new bulkEvaluate method:

const results = await flagsClient.bulkEvaluate<ValueType, EntitiesType>(
  [
    { key: "flag-a", defaultValue: false },
    { key: "flag-b", defaultValue: false },
  ],
  entities,
);

@flags-sdk/vercel

Implements bulkDecide using bulkEvaluate, so using the Flags SDK with Vercel Flags supports bulk evaluations as shown in the flags/next snippet above.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
flags-playground	Ready	Preview, Comment, Open in v0	May 25, 2026 12:57pm
flags-sdk-dev	Ready	Preview, Comment, Open in v0	May 25, 2026 12:57pm
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flags-sdk-next-16	Ready	Preview, Comment, Open in v0	May 25, 2026 12:57pm
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