build: add development configuration files

- Add TypeScript configuration with strict mode
- Configure Vitest for testing with coverage
- Add Biome for linting and formatting
- Include .gitignore for Node.js projects
- Add .editorconfig for consistent code style

Author: Mearman

.editorconfig

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+# EditorConfig is awesome: https://EditorConfig.org
+
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+trim_trailing_whitespace = true
+indent_style = tab
+indent_size = 4
+tab_width = 4
+
+# YAML files (must use spaces)
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+# Markdown files (spaces required for lists and code blocks)
+[*.md]
+indent_style = space
+indent_size = 2
+trim_trailing_whitespace = false
+
+# Makefile (must use tabs)
+[Makefile]
+indent_style = tab

.gitignore

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+# Dependencies
+node_modules/
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+.yarn/install-state.gz
+
+# TypeScript
+dist/
+build/
+*.tsbuildinfo
+
+# Logs
+logs/
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# Runtime data
+pids/
+*.pid
+*.seed
+*.pid.lock
+
+# Testing
+coverage/
+*.lcov
+.nyc_output/
+
+# Caches
+.cache/
+.parcel-cache/
+.next/
+.nuxt/
+.vuepress/dist/
+.docusaurus/
+.serverless/
+.fusebox/
+.dynamodb/
+.tern-port
+.vscode-test/
+.sass-cache/
+.eslintcache
+.stylelintcache
+.npm/
+
+# Environment files
+.env
+.env.local
+.env.*.local
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Editor files
+*.swp
+*.swo
+*~
+.idea/
+.vscode/
+
+# Temporary files
+*.tmp
+*.temp
+.tmp/
+.temp/
+
+# Optional npm cache directory
+.npm/
+
+# Optional eslint cache
+.eslintcache
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# Claude memory files
+.claude/
+CLAUDE.md

biome.json

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+{
+	"$schema": "https://biomejs.dev/schemas/1.9.4/schema.json",
+	"organizeImports": {
+		"enabled": true
+	},
+	"linter": {
+		"enabled": true,
+		"rules": {
+			"recommended": true,
+			"style": {
+				"noNonNullAssertion": "off"
+			},
+			"complexity": {
+				"noBannedTypes": "off"
+			}
+		}
+	},
+	"formatter": {
+		"enabled": true,
+		"formatWithErrors": true,
+		"indentStyle": "tab",
+		"indentWidth": 4,
+		"lineWidth": 100,
+		"lineEnding": "lf"
+	},
+	"javascript": {
+		"formatter": {
+			"quoteStyle": "single",
+			"semicolons": "always",
+			"trailingCommas": "all",
+			"arrowParentheses": "always"
+		}
+	},
+	"json": {
+		"formatter": {
+			"trailingCommas": "none"
+		}
+	},
+	"files": {
+		"ignore": [
+			"node_modules",
+			"dist",
+			"coverage",
+			"*.min.js",
+			"yarn.lock",
+			"package-lock.json",
+			"pnpm-lock.yaml",
+			"CHANGELOG.md",
+			"**/*.yml",
+			"**/*.yaml",
+			"**/*.md"
+		]
+	}
+}

tsconfig.json

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+{
+	"compilerOptions": {
+		"target": "ES2022",
+		"module": "ES2022",
+		"moduleResolution": "node",
+		"lib": ["ES2022"],
+		"outDir": "./dist",
+		"rootDir": "./src",
+		"strict": true,
+		"esModuleInterop": true,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true,
+		"declaration": true,
+		"declarationMap": true,
+		"sourceMap": true,
+		"allowSyntheticDefaultImports": true,
+		"resolveJsonModule": true
+	},
+	"include": ["src/**/*"],
+	"exclude": ["node_modules", "dist", "tests"]
+}

vitest.config.ts

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+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+	test: {
+		coverage: {
+			provider: 'v8',
+			reporter: ['text', 'json', 'html', 'lcov'],
+			exclude: [
+				'node_modules/',
+				'dist/',
+				'**/*.test.ts',
+				'**/*.d.ts',
+				'vitest.config.ts',
+			],
+			all: true,
+			lines: 80,
+			functions: 80,
+			branches: 80,
+			statements: 80,
+		},
+	},
+});