Build improvements

Author: vmoroz

.ado/scripts/.gitignore

@@ -0,0 +1,73 @@
+# Dependencies
+node_modules/
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Coverage directory used by tools like istanbul
+coverage/
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# ESLint cache
+.eslintcache
+
+# Optional npm cache directory
+.npm
+
+# 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
+
+# nuxt.js build output
+.nuxt
+
+# 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
+
+# macOS
+.DS_Store
+
+# Windows
+Thumbs.db
+ehthumbs.db
+Desktop.ini

.ado/scripts/.prettierignore

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+# Ignore files for Prettier
+node_modules/
+*.min.js
+*.bundle.js

.ado/scripts/.prettierrc

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+{
+  "semi": true,
+  "trailingComma": "all",
+  "singleQuote": false,
+  "printWidth": 80,
+  "tabWidth": 2,
+  "useTabs": false,
+  "bracketSpacing": true,
+  "arrowParens": "always",
+  "endOfLine": "lf",
+  "quoteProps": "as-needed"
+}

.ado/scripts/README.md

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+# JavaScript Build Scripts
+
+This folder contains the JavaScript build scripts for Hermes Windows, along with tooling to maintain code quality.
+
+## Files
+
+- `build.js` - Main build script for Hermes Windows
+- `setVersionNumber.js` - Script to set version numbers
+
+## Code Quality Tools
+
+We use **Prettier** and **ESLint** to maintain consistent code style and catch potential issues.
+
+### Setup
+
+From this directory (`.ado/scripts`), install the dependencies:
+
+```bash
+npm install
+```
+
+### Available Scripts
+
+- `npm run format` - Format all JavaScript files with Prettier
+- `npm run format:check` - Check if files need formatting
+- `npm run lint` - Run ESLint to check for code issues
+- `npm run lint:fix` - Run ESLint and automatically fix issues
+- `npm run lint:format` - Format with Prettier and then run ESLint with auto-fix
+
+### Usage
+
+To format and lint your changes:
+
+```bash
+npm run lint:format
+```
+
+To check formatting without changing files:
+
+```bash
+npm run format:check
+```
+
+To run just the linter:
+
+```bash
+npm run lint
+```
+
+## Configuration
+
+- `.prettierrc` - Prettier configuration (formatting rules)
+- `eslint.config.js` - ESLint configuration (code quality rules)
+- `package.json` - Dependencies and scripts
+
+## Best Practices
+
+1. Run `npm run lint:format` before committing changes
+2. Use double quotes for strings (enforced by Prettier)
+3. Always use trailing commas in multiline objects/arrays
+4. Use `const` instead of `let` when variables are not reassigned
+5. Use template literals instead of string concatenation when possible