feat: move to typescript & tidy up some code

.eslintrc.js

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+module.exports = {
+    parser: '@typescript-eslint/parser',  // Specifies the ESLint parser
+    //extends: [
+    //    'prettier',  // Uses eslint-config-prettier to disable ESLint rules from @typescript-eslint/eslint-plugin that would conflict with prettier
+    //    'plugin:prettier/recommended',  // Enables eslint-plugin-prettier and displays prettier errors as ESLint errors. Make sure this is always the last configuration in the extends array.
+    //],
+    parserOptions: {
+        ecmaVersion: 2018,  // Allows for the parsing of modern ECMAScript features
+        sourceType: 'module',  // Allows for the use of imports
+        experimentalDecorators: true,
+    },
+    rules: {
+        "@typescript-eslint/camelcase": 0
+    }
+};

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: File a bug report
+labels: ["type/bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        **NOTE:** Before you start, the following should be completed.
+
+        - Read the documentation to ensure the correct setup.
+        - Make sure no [similar issues(including closed ones)](https://github.com/slipx06/sunsynk-power-flow-card/issues?q=is%3Aissue+is%3Aopen+label%3Atype%2Fbug) exists.
+        - Make sure the request is based on the latest release.
+
+        Thanks for taking the time to assist with improving this project!
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered.
+      options:
+        - label: I have searched the existing issues
+          required: true
+  - type: textarea
+    id: current-behavior
+    attributes:
+      label: Current Behavior
+      description: A concise description of what you're experiencing.
+      placeholder: Tell us what you see!
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps To Reproduce
+      description: Steps to reproduce the behavior.
+      placeholder: |
+        1. In this environment...
+        2. With this config...
+        3. Run '...'
+        4. See error...
+    validations:
+      required: false
+  - type: textarea
+    id: expected-behaviour
+    attributes:
+      label: Expected behaviour
+      description: A concise description of what you expected to happen.
+      placeholder: Tell us what you should see!
+    validations:
+      required: true
+  - type: input
+    id: card-version
+    attributes:
+      label: Card Version
+      description: The version of the card you have installed
+    validations:
+      required: true
+  - type: input
+    id: ha-version
+    attributes:
+      label: Home Assistant Version
+      description: The version of Home Assistant you have installed
+    validations:
+      required: true
+  - type: textarea
+    id: config
+    attributes:
+      label: Configuration
+      description: Please copy and paste your configuration. This will be automatically formatted into code, so no need for backticks.
+      render: shell
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+---
+
+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea for this project
+labels: ['type/feature']
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to assist with improving this project!
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the feature you are requesting.
+      options:
+      - label: I have searched the existing issues
+        required: true
+  - type: textarea
+    id: current-behavior
+    attributes:
+      label: Current Behavior
+      description: A concise description of what you're experiencing.
+      placeholder: Tell us what you see!
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behaviour
+    attributes:
+      label: Expected behaviour
+      description: A concise description of what you expected to happen.
+      placeholder: Tell us what you should see!
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Possible Solutions
+      description: If you have an idea on how to implement this please let us know.
+    validations:
+      required: false
+  - type: dropdown
+    id: mode
+    attributes:
+      label: Mode
+      description: What mode does this feature apply to?
+      options:
+        - Event (default)
+        - Calendar
+        - Both
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Context / Reason
+      description: Providing context helps us come up with a solution that is most useful in the real world.
+    validations:
+      required: true

.github/release.yml

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+changelog:
+  categories:
+    - title: 💥 Breaking Changes
+      labels:
+        - semver/major
+        - flag/breaking changes
+    - title: 🚀 Exciting New Features
+      labels:
+        - semver/minor
+        - type/feat
+        - enhancement
+    - title: 🐛 Patches & Bug Fixes
+      labels:
+        - semver/patch
+        - type/bug
+        - bug
+    - title: 📚 Documentation
+      labels:
+        - type/docs
+        - documentation
+    - title: 📔 Language
+      labels:
+        - type/language
+        - language
+    - title: ⬆️ Dependencies
+      labels:
+        - type/dependencies
+        - dependencies
+    - title: Other Changes
+      labels:
+        - "*"

.github/workflows/pull_requests.yaml

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+---
+
+name: Pull Requests
+
+on:
+  pull_request:
+    branches:
+      - master
+  workflow_dispatch:
+jobs:
+  checkVersion:
+    if: github.event_name  == 'pull_request'
+
+    name: Check version updated
+    runs-on: ubuntu-latest
+    env:
+      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v2
+      # Use this GitHub Action
+      - name: Check package version
+        uses: dudo/tag_check@master
+        with:
+          git_tag_prefix: v

.github/workflows/release.yml

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+name: release
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  release:
+    name: Create release
+    if: startsWith(github.ref, 'refs/tags/')
+    runs-on: ubuntu-latest
+    steps:
+      - name: Getting your configuration from GitHub
+        uses: actions/checkout@v2
+      - name: 🛎️ Create release
+        id: create_release
+        uses: softprops/action-gh-release@v1
+        with:
+          generate_release_notes: true
+      - name: 🏷️ Update latest tag
+        uses: EndBug/latest-tag@latest

.gitignore

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+dist/*
+!dist/sunsynk-power-flow-card.js
+
+.devcontainer/*
+!.devcontainer/recommended-devcontainer.json
+!.devcontainer/recommended-Dockerfile
+
+.vscode/*
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+*.map
+package-lock.json
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# TypeScript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+.env.test
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+undefined/
+
+# next.js build output
+.next
+
+# nuxt.js build output
+.nuxt
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+docs/_build

.prettierrc

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+{
+  semi: true,
+  trailingComma: 'all',
+  singleQuote: true,
+  printWidth: 120,
+  useTabs: true,
+  tabWidth: 2
+}