immerjs/immer
Immer
Immer is an immutable state management library used to create new versions of data structures. It allows the production of new state by mutating a temporary draft instead of using manual object spreading.
The project implements structural sharing to reuse unchanged parts of a data tree between versions, which reduces memory consumption. It also functions as a JSON patch generator to calculate and output the differences between two state versions.
To ensure data integrity, the library includes a state mutation protector that freezes data structures to detect and prevent accidental modifications.
The project provides utilities for state management benchmarking and CPU profile analysis to identify performance regressions.
Features
- Immutable State Utilities - Provides utilities for updating deeply nested data structures through an immutable interface using temporary drafts.
- Structural Sharing - Implements structural sharing to reuse unchanged nodes between state versions, minimizing memory consumption.
- Finalization-Based State Commitment - Commits changes from a temporary proxy draft to a final immutable state once the mutation function completes.
- Recursive Proxy Wrapping - Dynamically wraps nested objects in proxies to track modifications deep within a data tree.
- Proxy-Based Reactivity - Uses JavaScript Proxies to intercept property access and assignments for recording state changes.
- State Management Libraries - A library designed for managing immutable application state via a draft-based mutation pattern.
- Mutation Protection - Freezes data structures to detect and prevent accidental modifications to a protected immutable state.
- JSON Patching - Calculates differences between state versions and outputs them as standard-compliant JSON patches.
- JSON Patch Generation - Generates standard JSON patches to describe the specific differences between two versions of a data tree.
- Memory-Efficient Data Processing Utilities - Reduces memory overhead by sharing unchanged references between different versions of a data structure.
- Mutation Prevention - Freezes data structures to detect and block unintended modifications to a protected state.
- Object Freezing - Recursively applies Object.freeze to produced states to prevent accidental direct mutations.
- Immutable State Patterns - Ensures strict immutability and prevents accidental mutations by freezing the application state.
- State Management - Utility for working with immutable state via mutation.
- Functional Programming - Functional state management with immutability.
- State Management - Listed in the “State Management” section of the Awesome React awesome list.
