tsconfigjsonin

tsconfigjsonin is not a standard term in TypeScript. It appears to be a misspelling or concatenation related to tsconfig.json, the configuration file the TypeScript compiler uses to understand a project.

A tsconfig.json file specifies the root of a TypeScript project and controls how the code is compiled. It is usually placed at the project root, and the compiler reads it as the primary source of configuration. The file can be extended by other config files to share settings.

The top level of a tsconfig.json contains properties such as compilerOptions, include, exclude, and files. CompilerOptions holds many settings like target, module, lib, strict, jsx, and esModuleInterop. Include and exclude determine which files participate in compilation; files lists explicit files.

The extends property allows inheriting settings from another tsconfig.json or from a package. References enables project references for large repos. Path patterns in include and exclude can use globs; baseUrl and paths enable module aliasing for non relative imports.

Usage involves invoking the TypeScript compiler with tsc -p tsconfig.json, or letting build tools and editors pick up the configuration automatically. Editors integrate with tsconfig.json to provide IntelliSense, error reporting, and incremental builds.

Discovery proceeds up the directory tree: if no project is specified, tsc searches for a tsconfig.json in the current directory and its ancestors. A misnamed or absent file means default compilation, with no project-wide settings.