[miniflare] Simulate Flagship bindings locally

[akshitsinha]

First PR in the stacked Flagship local-development series. Followed by #15329 and #15330.

Summary

• Simulates Flagship bindings in Miniflare with persisted local app and flag state.
• Supports typed values, targeting rules, deterministic rollouts, defaults, and evaluation details.
• Exposes a typed local administration API for Wrangler and Local Explorer.
• Leaves remotely configured bindings unchanged.

Tests

• Tests included/updated
• Automated tests not possible - manual testing has been completed as follows:
• Additional testing not necessary because:

Public documentation

• Cloudflare docs PR(s): [Flagship] Document the local flag store for wrangler dev cloudflare-docs#32879
• Documentation not necessary because:

[changeset-bot]

🦋 Changeset detected

Latest commit: 212628c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
miniflare	Minor
@cloudflare/deploy-helpers	Patch
@cloudflare/pages-shared	Patch
@cloudflare/remote-bindings	Patch
@cloudflare/runtime-types	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-plugin	Patch
wrangler	Patch

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[pkg-pr-new]

@cloudflare/autoconfig

npm i https://pkg.pr.new/@cloudflare/autoconfig@15268

@cloudflare/build-output-utils

npm i https://pkg.pr.new/@cloudflare/build-output-utils@15268

@cloudflare/codemods

npm i https://pkg.pr.new/@cloudflare/codemods@15268

@cloudflare/config

npm i https://pkg.pr.new/@cloudflare/config@15268

create-cloudflare

npm i https://pkg.pr.new/create-cloudflare@15268

@cloudflare/deploy-helpers

npm i https://pkg.pr.new/@cloudflare/deploy-helpers@15268

@cloudflare/kv-asset-handler

npm i https://pkg.pr.new/@cloudflare/kv-asset-handler@15268

miniflare

npm i https://pkg.pr.new/miniflare@15268

@cloudflare/pages-functions

npm i https://pkg.pr.new/@cloudflare/pages-functions@15268

@cloudflare/pages-shared

npm i https://pkg.pr.new/@cloudflare/pages-shared@15268

@cloudflare/unenv-preset

npm i https://pkg.pr.new/@cloudflare/unenv-preset@15268

@cloudflare/vite-plugin

npm i https://pkg.pr.new/@cloudflare/vite-plugin@15268

@cloudflare/vitest-plugin

npm i https://pkg.pr.new/@cloudflare/vitest-plugin@15268

@cloudflare/workers-auth

npm i https://pkg.pr.new/@cloudflare/workers-auth@15268

@cloudflare/workers-editor-shared

npm i https://pkg.pr.new/@cloudflare/workers-editor-shared@15268

@cloudflare/workers-utils

npm i https://pkg.pr.new/@cloudflare/workers-utils@15268

wrangler

npm i https://pkg.pr.new/wrangler@15268

commit: 212628c

[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• .changeset/local-flagship-runtime.md: [@cloudflare/wrangler]
• packages/miniflare/src/index.ts: [@cloudflare/wrangler]
• packages/miniflare/src/plugins/flagship/index.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/admin.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/binding.worker.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/constants.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/evaluate.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/flags.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/object.worker.ts: [@cloudflare/wrangler]
• packages/miniflare/test/plugins/flagship/evaluate.spec.ts: [@cloudflare/wrangler]
• packages/miniflare/test/plugins/flagship/index.spec.ts: [@cloudflare/wrangler]

[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• .changeset/local-flagship-runtime.md: [@cloudflare/wrangler]
• packages/miniflare/src/index.ts: [@cloudflare/wrangler]
• packages/miniflare/src/plugins/flagship/index.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/admin.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/binding.worker.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/constants.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/evaluate.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/flags.ts: [@cloudflare/wrangler]
• packages/miniflare/src/workers/flagship/object.worker.ts: [@cloudflare/wrangler]
• packages/miniflare/test/plugins/flagship/evaluate.spec.ts: [@cloudflare/wrangler]
• packages/miniflare/test/plugins/flagship/index.spec.ts: [@cloudflare/wrangler]