LensMCP container/memory mutation tracking (Map/Set/Array instrumentation).

An exchange that automaticcally populates the mutation selection body

An interface for providing default updates for mutation - query pairings

Olas mutation queue — durable persistence + reload-safe replay for persistable mutations.

Mutation-testing toolkit for CPSC 210.

A quasi mutation observer polyfill (sort of)

Object.freeze globals to prevent accidental mutation during the life of your program.

A test runner plugin to use Bun with StrykerJS, the JavaScript mutation testing framework

Lunora browser SDK: WebSocket transport, optimistic updates, and an offline mutation queue

ast node mutation apis

This plugins injects a validation rule into the validation phase that only allows the specified operation types (e.g. `subscription`, `query` or `mutation`).

Ignore all console statements from mutation testing.

Streaming and mutation API for HTTP responses.

Mutation testing for Playwright assertions: invert each test's primary assertion and fail the run if the test stays green.

Record the DOM mutation within PageSpy.

arrive.js provides events to watch for DOM elements creation and removal. It makes use of Mutation Observers internally.

Byline CMS client API — DSL-like query and mutation layer

This package exports a method that will traverse a JSON-Schema, calling a mutation function for each sub schema found. It is useful for building tools to work with JSON Schemas.

The Voltro wire + plugin contract — defineQuery/Mutation/Action/Stream, definePlugin, sessions / JWT / API-keys, and the RPC protocol.

The local AST mutation daemon for StyleUI