Ensure configuration files are precise and stable to prevent unexpected build failures and runtime issues. This includes: 1. **Use correct syntax in configuration files** Validate JSON files for syntax errors like extra commas, which can cause cryptic error messages during builds. ```json // Incorrect { "$schema": "https://turborepo.com/schema.json",, "ui": "tui" } // Correct { "$schema": "https://turborepo.com/schema.json", "ui": "tui" } ``` 2. **Specify exact versions for critical dependencies** Use exact versions instead of ranges (`^` or `~`) for dependencies when stability is critical, especially in test fixtures or shared packages. ```json // Less stable (allows minor updates) "dependencies": { "@types/d3-scale": "^4.0.2" } // More stable (locks exact version) "dependencies": { "@types/d3-scale": "4.0.2" } ``` 3. **Explicitly specify package manager** Include the `packageManager` field in package.json to ensure consistent behavior across environments, especially when using version wildcards (`*`). ```json { "name": "monorepo", "packageManager": "pnpm@8.14.0", "dependencies": { "util": "*" } } ``` 4. **Establish clear sources of truth** Define which configuration files are authoritative for specific settings. For example, make package.json's `engines` field the definitive source for Node.js version requirements. ```json "engines": { "node": "22.x" } ``` These practices reduce configuration drift, prevent unexpected behavior, and help maintain consistency across environments and team members.