chore: update open-wc setup to match state-of-the-art

Author: tpluscode

.babelrc

@@ -0,0 +1,14 @@
+{
+  "plugins": [
+    [
+      "@babel/plugin-proposal-decorators",
+      {
+        "decoratorsBeforeExport": true
+      }
+    ],
+    "@babel/plugin-proposal-class-properties"
+  ],
+  "presets": [
+    "@babel/preset-typescript"
+  ]
+}

.editorconfig

@@ -3,6 +3,3 @@ end_of_line = lf
 indent_size = 2
 indent_style = space
 trim_trailing_whitespace = true
-
-[*.ts]
-indent_size = 4

.eslintignore

@@ -1,8 +1,10 @@
 {
   "root": true,
   "extends": [
-    "standard",
-    "plugin:@typescript-eslint/recommended"
+    "@open-wc/eslint-config",
+    "eslint-config-prettier",
+    "plugin:@typescript-eslint/recommended",
+    "standard"
   ],
   "env": {
     "browser": true
@@ -14,12 +16,32 @@
   },
   "plugins": [
     "@typescript-eslint/eslint-plugin",
-    "mocha"
+    "lit"
   ],
   "rules": {
-    "quotes": ["error", "single", { "avoidEscape": true }],
-    "comma-dangle": ["error", "always-multiline"],
-    "@typescript-eslint/explicit-function-return-type": "off",
-    "@typescript-eslint/indent": "off"
-  }
+    "indent": "off",
+    "import/no-unresolved": "warn",
+    "import/extensions": "off",
+    "space-before-function-paren": [
+      "error",
+      {
+        "named": "never"
+      }
+    ],
+    "comma-dangle": [
+      "error",
+      "always-multiline"
+    ],
+    "@typescript-eslint/no-var-requires": "warn",
+    "@typescript-eslint/indent": ["error", 2],
+    "import/no-extraneous-dependencies": ["error", {"devDependencies": true, "optionalDependencies": true, "peerDependencies": true}]
+  },
+  "overrides": [
+    {
+      "files": ["test/*.ts", "snapshot/*.ts"],
+      "rules": {
+        "no-unused-expressions": "off"
+      }
+    }
+  ]
 }

.eslintrc.json

@@ -1,186 +1,9 @@
-
-# Created by https://www.gitignore.io/api/node,polymer,typings,webstorm+all
-# Edit at https://www.gitignore.io/?templates=node,polymer,typings,webstorm+all
-
-### Node ###
-# Logs
-logs
-*.log
-npm-debug.log*
-yarn-debug.log*
-yarn-error.log*
-
-# 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/
-*.d.ts
-
-# 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
-
-# parcel-bundler cache (https://parceljs.org/)
-.cache
-
-# 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/
-
-### Polymer ###
-#Installed components via bower
-bower_components/
-
-#Installed modules via npm
-
-#Polymer-cli builds
-build/
-
-### Typings ###
-## Ignore downloaded typings
-typings
-
-### WebStorm+all ###
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
-# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
-
-# User-specific stuff
-.idea/**/workspace.xml
-.idea/**/tasks.xml
-.idea/**/usage.statistics.xml
-.idea/**/dictionaries
-.idea/**/shelf
-
-# Generated files
-.idea/**/contentModel.xml
-
-# Sensitive or high-churn files
-.idea/**/dataSources/
-.idea/**/dataSources.ids
-.idea/**/dataSources.local.xml
-.idea/**/sqlDataSources.xml
-.idea/**/dynamic.xml
-.idea/**/uiDesigner.xml
-.idea/**/dbnavigator.xml
-
-# Gradle
-.idea/**/gradle.xml
-.idea/**/libraries
-
-# Gradle and Maven with auto-import
-# When using Gradle or Maven with auto-import, you should exclude module files,
-# since they will be recreated, and may cause churn.  Uncomment if using
-# auto-import.
-# .idea/modules.xml
-# .idea/*.iml
-# .idea/modules
-
-# CMake
-cmake-build-*/
-
-# Mongo Explorer plugin
-.idea/**/mongoSettings.xml
-
-# File-based project format
-*.iws
-
-# IntelliJ
-out/
-
-# mpeltonen/sbt-idea plugin
-.idea_modules/
-
-# JIRA plugin
-atlassian-ide-plugin.xml
-
-# Cursive Clojure plugin
-.idea/replstate.xml
-
-# Crashlytics plugin (for Android Studio and IntelliJ)
-com_crashlytics_export_strings.xml
-crashlytics.properties
-crashlytics-build.properties
-fabric.properties
-
-# Editor-based Rest Client
-.idea/httpRequests
-
-# Android studio 3.1+ serialized cache file
-.idea/caches/build_file_checksums.ser
-
-### WebStorm+all Patch ###
-# Ignores the whole .idea folder and all .iml files
-# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
-
-.idea/
-
-# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
-
-*.iml
-modules.xml
-.idea/misc.xml
-*.ipr
-
-# End of https://www.gitignore.io/api/node,polymer,typings,webstorm+all
-
-lib/*.js
-/*-*.js
-
+*.js
 *.js.map
+*.d.ts
+!*.config.js
+!*.conf.js
+/lib/
+/coverage/
+*.log

.gitignore

@@ -5,6 +5,7 @@ node_js:
 before_install:
 - npm install -g codecov
 script:
+- npm run lint
 - npm run test
 - npm run test:bs
 after_success: