Add the Prettier configuration

.prettierignore

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+#-------------------------------------------------------------------------------------------------------------------
+# Keep this section in sync with .gitignore
+#-------------------------------------------------------------------------------------------------------------------
+
+# Logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+*.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 (http://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/
+
+# 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
+
+# next.js build output
+.next
+
+# OS X temporary files
+.DS_Store
+
+# Rush temporary files
+common/deploy/
+common/temp/
+**/.rush/temp/
+
+# Common toolchain intermediate files
+temp
+lib
+lib-amd
+lib-es6
+dist
+*.scss.ts
+*.sass.ts
+
+# Visual Studio Code
+.vscode
+
+# Remove eventually
+package-deps.json
+
+#-------------------------------------------------------------------------------------------------------------------
+# Prettier-specific overrides
+#-------------------------------------------------------------------------------------------------------------------
+
+# Machine-egnerated files
+common/reviews
+common/changes
+CHANGELOG.*
+pnpm-lock.yaml
+build-tests/*/etc
+dist-dev
+dist-prod
+
+# We'll consider enabling this later; Prettier reformats code blocks, which affects end-user content
+*.md

.prettierrc.js

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+// Documentation for this file: https://prettier.io/docs/en/configuration.html
+module.exports = {
+  // We use a larger print width because Prettier's word-wrapping seems to be tuned
+  // for plain JavaScript without type annotations
+  printWidth: 110,
+  // Microsoft style quotes
+  singleQuote: true,
+  // Preserve existing newlines
+  endOfLine: 'auto',
+};