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align=\"center\"\u003e\n    \u003cimg src=\"https://raw.githubusercontent.com/ngxs-labs/emitter/master/docs/assets/logo.png\"\u003e\n\u003c/p\u003e\n\n---\n\n\u003e Declarative state mutations\n\n[![Build Status](https://travis-ci.org/ngxs-labs/immer-adapter.svg?branch=master)](https://travis-ci.org/ngxs-labs/immer-adapter)\n[![NPM](https://badge.fury.io/js/%40ngxs-labs%2Fimmer-adapter.svg)](https://www.npmjs.com/package/@ngxs-labs/immer-adapter)\n[![License](https://img.shields.io/badge/License-MIT-green.svg)](https://github.com/ngxs-labs/immer-adapter/blob/master/LICENSE)\n[![Codacy Badge](https://api.codacy.com/project/badge/Grade/3f1e798f0a174a20940fb9d5f5e50a43)](https://www.codacy.com/app/arturovt/immer-adapter?utm_source=github.com\u0026utm_medium=referral\u0026utm_content=ngxs-labs/immer-adapter\u0026utm_campaign=Badge_Grade)\n\n\u003cp align=\"center\"\u003e\n    \u003cimg src=\"https://raw.githubusercontent.com/ngxs-labs/immer-adapter/master/docs/assets/immer.png\"\u003e\n\u003c/p\u003e\n\n#### 📦 Install\n\nTo install `@ngxs-labs/immer-adapter` and `immer` that is a peer-dependency run the following command:\n\n```console\nnpm install @ngxs-labs/immer-adapter immer\n# or if you use yarn\nyarn add @ngxs-labs/immer-adapter immer\n```\n\n##### Before\n\nWhen your state is growing - it becomes harder to manage such mutations:\n\n```ts\nimport { State, Action, StateContext } from '@ngxs/store';\n\nexport class FeedZebra {\n  public static readonly type = '[Animals] Feed zebra';\n  constructor(public payload: string) {}\n}\n\n@State\u003cAnimalsStateModel\u003e({\n  name: 'animals',\n  defaults: {\n    zebra: {\n      food: ['leaves', 'bark'],\n      name: 'zebra'\n    },\n    panda: {\n      food: [],\n      name: 'panda'\n    }\n  }\n})\nexport class AnimalState {\n  @Selector()\n  public static zebraFood(state: AnimalsStateModel): string[] {\n    const zebraFood = [...state.zebra.food];\n    zebraFood.reverse();\n  }\n\n  @Action(Add)\n  public add({ getState, setState }: StateContext\u003cAnimalsStateModel\u003e, { payload }: Add): void {\n    setState((state: AnimalsStateModel) =\u003e ({\n      ...state,\n      zebra: {\n        ...state.zebra,\n        food: [ ...state.zebra.food, payload ]\n      }\n    }));\n  }\n}\n```\n\n##### After\n\n`immer-adapter` gives you the opportunity to manage mutations in a more declarative way:\n\n```ts\nimport { ImmutableContext, ImmutableSelector } from '@ngxs-labs/immer-adapter';\n\n@State\u003cAnimalsStateModel\u003e({\n  name: 'animals',\n  defaults: {\n    zebra: {\n      food: [],\n      name: 'zebra'\n    },\n    panda: {\n      food: [],\n      name: 'panda'\n    }\n  }\n})\nexport class AnimalState {\n  @Selector()\n  @ImmutableSelector()\n  public static zebraFood(state: AnimalsStateModel): string[] {\n    return state.zebra.food.reverse();\n  }\n\n  @Action(Add)\n  @ImmutableContext()\n  public add({ setState }: StateContext\u003cAnimalsStateModel\u003e, { payload }: Add): void {\n    setState((state: AnimalsStateModel) =\u003e ({\n      state.zebra.food.push(payload);\n      return state;\n    }));\n  }\n}\n```\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fngxs-labs%2Fimmer-adapter","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fngxs-labs%2Fimmer-adapter","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fngxs-labs%2Fimmer-adapter/lists"}