feat(core): Reducers, Lenses and various utils

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  actions: read
+  contents: read
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      # This enables task distribution via Nx Cloud
+      # Run this command as early as possible, before dependencies are installed
+      # Learn more at https://nx.dev/ci/reference/nx-cloud-cli#npx-nxcloud-startcirun
+      # Uncomment this line to enable task distribution
+      # - run: npx nx-cloud start-ci-run --distribute-on="3 linux-medium-js" --stop-agents-after="build"
+
+      # Cache node_modules
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'npm'
+
+      - run: npm ci --legacy-peer-deps
+      - uses: nrwl/nx-set-shas@v4
+
+      # Prepend any command with "nx-cloud record --" to record its logs to Nx Cloud
+      # - run: npx nx-cloud record -- echo Hello World
+      # Nx Affected runs only tasks affected by the changes in this PR/commit. Learn more: https://nx.dev/ci/features/affected
+      - run: npx nx affected -t lint test build

.gitignore

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+# See http://help.github.com/ignore-files/ for more about ignoring files.
+
+# compiled output
+dist
+tmp
+out-tsc
+
+# dependencies
+node_modules
+
+# IDEs and editors
+/.idea
+.project
+.classpath
+.c9/
+*.launch
+.settings/
+*.sublime-workspace
+
+# IDE - VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+
+# misc
+/.sass-cache
+/connect.lock
+/coverage
+/libpeerconnection.log
+npm-debug.log
+yarn-error.log
+testem.log
+/typings
+
+# System Files
+.DS_Store
+Thumbs.db
+
+.nx/cache
+.nx/workspace-data
+
+vite.config.*.timestamp*
+vitest.config.*.timestamp*

.prettierignore

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+# Add files here to ignore them from prettier formatting
+/dist
+/coverage
+/.nx/cache
+/.nx/workspace-data

.prettierrc

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+{
+  "singleQuote": true
+}

.vscode/extensions.json

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+{
+  "recommendations": [
+    "nrwl.angular-console",
+    "esbenp.prettier-vscode",
+    "dbaeumer.vscode-eslint"
+  ]
+}

NX_README.md

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+# Focus
+
+<a alt="Nx logo" href="https://nx.dev" target="_blank" rel="noreferrer"><img src="https://raw.githubusercontent.com/nrwl/nx/master/images/nx-logo.png" width="45"></a>
+
+✨ Your new, shiny [Nx workspace](https://nx.dev) is almost ready ✨.
+
+[Learn more about this workspace setup and its capabilities](https://nx.dev/nx-api/js?utm_source=nx_project&amp;utm_medium=readme&amp;utm_campaign=nx_projects) or run `npx nx graph` to visually explore what was created. Now, let's get you up to speed!
+
+## Finish your CI setup
+
+[Click here to finish setting up your workspace!](https://cloud.nx.app/connect/huvlCxVJhP)
+
+
+## Generate a library
+
+```sh
+npx nx g @nx/js:lib packages/pkg1 --publishable --importPath=@my-org/pkg1
+```
+
+## Run tasks
+
+To build the library use:
+
+```sh
+npx nx build pkg1
+```
+
+To run any task with Nx use:
+
+```sh
+npx nx <target> <project-name>
+```
+
+These targets are either [inferred automatically](https://nx.dev/concepts/inferred-tasks?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects) or defined in the `project.json` or `package.json` files.
+
+[More about running tasks in the docs &raquo;](https://nx.dev/features/run-tasks?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)
+
+## Versioning and releasing
+
+To version and release the library use
+
+```
+npx nx release
+```
+
+Pass `--dry-run` to see what would happen without actually releasing the library.
+
+[Learn more about Nx release &raquo;](hhttps://nx.dev/features/manage-releases?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)
+
+## Keep TypeScript project references up to date
+
+Nx automatically updates TypeScript [project references](https://www.typescriptlang.org/docs/handbook/project-references.html) in `tsconfig.json` files to ensure they remain accurate based on your project dependencies (`import` or `require` statements). This sync is automatically done when running tasks such as `build` or `typecheck`, which require updated references to function correctly.
+
+To manually trigger the process to sync the project graph dependencies information to the TypeScript project references, run the following command:
+
+```sh
+npx nx sync
+```
+
+You can enforce that the TypeScript project references are always in the correct state when running in CI by adding a step to your CI job configuration that runs the following command:
+
+```sh
+npx nx sync:check
+```
+
+[Learn more about nx sync](https://nx.dev/reference/nx-commands#sync)
+
+
+[Learn more about Nx on CI](https://nx.dev/ci/intro/ci-with-nx#ready-get-started-with-your-provider?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)
+
+## Install Nx Console
+
+Nx Console is an editor extension that enriches your developer experience. It lets you run tasks, generate code, and improves code autocompletion in your IDE. It is available for VSCode and IntelliJ.
+
+[Install Nx Console &raquo;](https://nx.dev/getting-started/editor-setup?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)
+
+## Useful links
+
+Learn more:
+
+- [Learn more about this workspace setup](https://nx.dev/nx-api/js?utm_source=nx_project&amp;utm_medium=readme&amp;utm_campaign=nx_projects)
+- [Learn about Nx on CI](https://nx.dev/ci/intro/ci-with-nx?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)
+- [Releasing Packages with Nx release](https://nx.dev/features/manage-releases?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)
+- [What are Nx plugins?](https://nx.dev/concepts/nx-plugins?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)
+
+And join the Nx community:
+- [Discord](https://go.nx.dev/community)
+- [Follow us on X](https://twitter.com/nxdevtools) or [LinkedIn](https://www.linkedin.com/company/nrwl)
+- [Our Youtube channel](https://www.youtube.com/@nxdevtools)
+- [Our blog](https://nx.dev/blog?utm_source=nx_project&utm_medium=readme&utm_campaign=nx_projects)

eslint.config.cjs

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+const nx = require('@nx/eslint-plugin');
+
+module.exports = [
+  ...nx.configs['flat/base'],
+  ...nx.configs['flat/typescript'],
+  ...nx.configs['flat/javascript'],
+  {
+    ignores: ['**/dist'],
+  },
+  {
+    files: ['**/*.ts', '**/*.tsx', '**/*.js', '**/*.jsx'],
+    rules: {
+      '@nx/enforce-module-boundaries': [
+        'error',
+        {
+          enforceBuildableLibDependency: true,
+          allow: ['^.*/eslint(\\.base)?\\.config\\.[cm]?js$'],
+          depConstraints: [
+            {
+              sourceTag: '*',
+              onlyDependOnLibsWithTags: ['*'],
+            },
+          ],
+        },
+      ],
+    },
+  },
+  {
+    files: [
+      '**/*.ts',
+      '**/*.tsx',
+      '**/*.js',
+      '**/*.jsx',
+      '**/*.cjs',
+      '**/*.mjs',
+    ],
+    // Override or add rules here
+    rules: {},
+  },
+];

nx.json

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+{
+  "$schema": "./node_modules/nx/schemas/nx-schema.json",
+  "namedInputs": {
+    "default": ["{projectRoot}/**/*", "sharedGlobals"],
+    "production": [
+      "default",
+      "!{projectRoot}/.eslintrc.json",
+      "!{projectRoot}/eslint.config.cjs",
+      "!{projectRoot}/**/?(*.)+(spec|test).[jt]s?(x)?(.snap)",
+      "!{projectRoot}/tsconfig.spec.json",
+      "!{projectRoot}/src/test-setup.[jt]s"
+    ],
+    "sharedGlobals": ["{workspaceRoot}/.github/workflows/ci.yml"]
+  },
+  "nxCloudId": "6769720ae81c511e7dfa8606",
+  "plugins": [
+    {
+      "plugin": "@nx/js/typescript",
+      "options": {
+        "typecheck": {
+          "targetName": "typecheck"
+        },
+        "build": {
+          "targetName": "build",
+          "configName": "tsconfig.lib.json"
+        }
+      }
+    },
+    {
+      "plugin": "@nx/eslint/plugin",
+      "options": {
+        "targetName": "lint"
+      }
+    }
+  ],
+  "targetDefaults": {
+    "@nx/vite:test": {
+      "cache": true,
+      "inputs": ["default", "^production"]
+    }
+  }
+}