Explain advanced compiler options and their performance implications.

Advanced compiler options affect type checking performance, build speed, and output quality. Performance-Critical Options: { "compilerOptions": { // Skip type checking of declaration files "skipLibCheck": true, "skipDefaultLibCheck": true, // Enable incremental compilation "incremental": true, "tsBuildInfoFile": ".tsbuildinfo", // Faster builds but less type safety "noEmitOnError": false, "isolatedModules": true, // Remove unused imports "importsNotUsedAsValues": "remove", "preserveValueImports": false } } Strict Mode Options: { "compilerOptions": { // Enable all strict checks "strict": true, // Individual strict options "noImplicitAny": true, "strictNullChecks": true, "strictFunctionTypes": true, "strictBindCallApply": true, "strictPropertyInitialization": true, "noImplicitReturns": true, "noImplicitThis": true, "noUncheckedIndexedAccess": true } } Output Control Options: { "compilerOptions": { // Control output format "target": "ES2020", "module": "ESNext", "moduleResolution": "node", // Source maps and debugging "sourceMap": true, "inlineSourceMap": false, "declarationMap": true, // Tree shaking support "sideEffects": false, "useDefineForClassFields": true } } Project References for Large Projects: { "compilerOptions": { "composite": true, "declaration": true, "declarationMap": true }, "references": [ { "path": "./packages/core" }, { "path": "./packages/ui" } ] } Performance Monitoring: // Enable build timing tsc --build --verbose // Generate trace files tsc --generateTrace trace // Analyze with --listFiles tsc --listFiles Optimization Strategies: 1. Use skipLibCheck for faster builds 2. Enable incremental compilation 3. Use project references for monorepos 4. Exclude unnecessary files 5. Use isolatedModules with bundlers 6. Minimize use of complex conditional types 7. Prefer interfaces over type aliases 8. Use const assertions for better performance Build Tool Integration: // Webpack with ts-loader { test: /\.tsx?$/, use: { loader: "ts-loader", options: { transpileOnly: true, // Skip type checking projectReferences: true } } } // Use ForkTsCheckerWebpackPlugin for separate type checking Benefits: • Faster compilation times • Better memory usage • Improved developer experience • Scalable build architecture • Optimized output for production.