Initialize project

.eslintrc.js

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+// eslint-disable-next-line no-undef
+module.exports = {
+  root: true,
+  parser: "@typescript-eslint/parser",
+  parserOptions: {
+      "project": "tsconfig.json",
+      "sourceType": "module"
+  },
+  env: {
+      "browser": true,
+  },
+  plugins: [
+    "@typescript-eslint",
+  ],
+  extends: [
+    "plugin:@typescript-eslint/recommended",
+    "plugin:@typescript-eslint/recommended-requiring-type-checking",
+    "eslint-config-airbnb-base",
+    "eslint-config-prettier"
+  ],
+  settings: {
+      "import/resolver": {
+        "node": {
+          "extensions": [".ts"]
+        }
+      }
+  },
+  rules: {
+    "import/no-unresolved": [2],
+    "@typescript-eslint/explicit-function-return-type": "error",
+    "@typescript-eslint/explicit-module-boundary-types": "error",
+    "@typescript-eslint/prefer-regexp-exec": "warn",
+    "@typescript-eslint/restrict-template-expressions": "warn",
+    "@typescript-eslint/no-unsafe-member-access": "warn",
+    "@typescript-eslint/no-unnecessary-type-assertion": "warn",
+    "@typescript-eslint/no-unsafe-return": "warn",
+    "@typescript-eslint/no-unsafe-call": "warn",
+    "@typescript-eslint/no-unsafe-assignment": "warn",
+    "@typescript-eslint/no-empty-interface": "off",
+    "@typescript-eslint/no-namespace": "off",
+    "@typescript-eslint/semi": [
+        "error",
+        "always"
+    ],
+    "@typescript-eslint/no-unused-vars": "error",
+    "no-shadow": "off",
+    "@typescript-eslint/no-shadow": ["error"],
+    "no-use-before-define": "off",
+    "@typescript-eslint/no-use-before-define": [
+      "error", 
+      { "functions": false }
+    ],
+    "no-unused-vars": "off",
+    "no-useless-escape": "warn",
+    "no-prototype-builtins": "warn",
+    "no-console": "off",
+    "arrow-parens": [
+        "off",
+        "always"
+    ],
+    "sort-keys": "off",
+    "max-len": "off",
+    "no-bitwise": "off",
+    "no-duplicate-case": "error",
+    "quotes": ["off", "single"],
+    "curly": "error", 
+    "import/extensions": "off",
+    "class-methods-use-this": "off",
+    "no-plusplus": ["error", { "allowForLoopAfterthoughts": true }],
+    "camelcase": ["error", {"allow": ["UNSAFE_componentWillReceiveProps"]}],
+    "import/prefer-default-export": "off",
+    "import/no-default-export": "error",
+    "no-param-reassign": ["error", { "props": false }],
+    "no-underscore-dangle": ["error", { "enforceInMethodNames": true, "allowAfterThis": true }],
+    "no-useless-constructor": "off",
+    "no-empty-function": ["error", {"allow": ["constructors"]}],
+  }
+};

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.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
+*.lcov
+
+# 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/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# 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
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*

azure-pipelines.yml

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+name: $(Build.BuildId)
+trigger:
+  batch: true
+  branches:
+    include: 
+    - '*'
+  tags:
+    include:
+    - '*'
+
+jobs:
+  - job: BuildJavaScript
+    displayName: Build JavaScript
+    pool:
+      vmName: ubuntu-18.04
+      demands:
+      - npm
+
+    steps:
+    - task: Npm@1
+      displayName: 'npm cache clean --force'
+      inputs:
+        command: custom
+        verbose: false
+        customCommand: 'cache clean --force'
+
+    - task: Npm@1
+      displayName: 'npm install'
+
+    - task: Npm@1
+      displayName: 'npm run lint:ci'
+      inputs:
+        command: custom
+        verbose: false
+        customCommand: 'run lint:ci'
+
+    - task: Npm@1
+      displayName: 'npm run build'
+      inputs:
+        command: custom
+        verbose: false
+        customCommand: 'run build'
+

gulpfile.ts

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+import {series, watch, dest} from 'gulp'
+import ts from 'gulp-typescript'
+import del from 'del'
+import {spawn} from 'child_process'
+
+const tsProject = ts.createProject("tsconfig.json", {declaration: true})
+
+function tsBuild() {
+  return tsProject
+    .src()
+    .pipe(tsProject())
+    .pipe(dest("dist"))
+}
+
+async function run() {
+  spawn('node', ['dist/index.js'], {stdio: 'inherit'})
+}
+
+async function tsRun() {
+  spawn('ts-node', ['src/index.ts'], {stdio: 'inherit'})
+}
+
+function watchRun() {
+  watch('src/*.ts', tsRun)
+}
+
+export const build = tsBuild
+
+export function clean() {
+  return del('dist')
+}
+
+export const start = series(clean, build, run)
+
+export const dev = series(tsRun, watchRun)
+