# structure > Structure rules that no standard linter ships, at level `all`: lone files, shared name prefixes, file and folder clashes, long files, trivial functions, and environment reads outside the environment readers. Structure rules that no standard linter ships, at level `all`: lone files, shared name prefixes, file and folder clashes, long files, trivial functions, and environment reads outside the environment readers. ## Checks | Check | Stage | Level | What it does | | ----------------------------------------------------------------------------------- | -------- | ----- | -------------------------------------------------------------------------------------------------- | | [`structure/lone-files`](/reference/checks/structure/lone-files/) | `commit` | `all` | Finds a folder that holds one code file and nothing else. | | [`structure/shared-prefixes`](/reference/checks/structure/shared-prefixes/) | `commit` | `all` | Finds sibling files that share a name prefix, such as `asset-card`, `asset-list`, and `asset-row`. | | [`structure/file-folder-clashes`](/reference/checks/structure/file-folder-clashes/) | `commit` | `all` | Finds a file and a folder with one stem in the same place, such as `turn.ts` beside `turn/`. | | [`structure/long-files`](/reference/checks/structure/long-files/) | `commit` | `all` | Checks the code line count of each file against the limit for its language. | | [`structure/trivial-functions`](/reference/checks/structure/trivial-functions/) | `commit` | `all` | Finds functions with too few statements and files that only forward to other code. | | [`structure/environment-readers`](/reference/checks/structure/environment-readers/) | `commit` | `all` | Finds environment reads outside the files listed in structure.environment\_readers. | ## Settings | Setting | What it sets | | ------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | [`limits.file_lines`](/reference/gspot-toml/#limits.file_lines) | The most lines one file may have, not counting blank lines and comment-only lines. | | [`limits.function_lines`](/reference/gspot-toml/#limits.function_lines) | The most lines one function may have. | | [`limits.function_parameters`](/reference/gspot-toml/#limits.function_parameters) | The most parameters one function may take. | | [`limits.function_statements`](/reference/gspot-toml/#limits.function_statements) | The most statements one function may have. | | [`limits.block_nesting`](/reference/gspot-toml/#limits.block_nesting) | How deep blocks may nest inside one function. | | [`limits.callback_nesting`](/reference/gspot-toml/#limits.callback_nesting) | How deep callbacks may nest. | | [`limits.cognitive_complexity`](/reference/gspot-toml/#limits.cognitive_complexity) | The highest sonarjs cognitive score one function may have; the score grows as the function gets harder to follow. | | [`limits.cyclomatic_complexity`](/reference/gspot-toml/#limits.cyclomatic_complexity) | The most paths that may run through one function. | | [`limits.function_branches`](/reference/gspot-toml/#limits.function_branches) | The most branches one function may have. | | [`limits.function_returns`](/reference/gspot-toml/#limits.function_returns) | The most return statements one function may have. | | [`limits.function_assignments`](/reference/gspot-toml/#limits.function_assignments) | The most variable assignments one shell function may make. | | [`limits.closure_lines`](/reference/gspot-toml/#limits.closure_lines) | The most lines one Swift closure may have. | | [`limits.type_lines`](/reference/gspot-toml/#limits.type_lines) | The most lines one Swift type body may have. | | [`limits.index_exports`](/reference/gspot-toml/#limits.index_exports) | The most re-exports one index file may hold. | | [`limits.trivial_function_statements`](/reference/gspot-toml/#limits.trivial_function_statements) | Report functions with this many statements or fewer; any whole number from 1 up works, a higher number reports more functions, and limits.`` sets it for one language. | | [`limits.shared_prefix_files`](/reference/gspot-toml/#limits.shared_prefix_files) | The number of siblings sharing a name prefix that makes a finding. | | [`structure.reexports`](/reference/gspot-toml/#structure.reexports) | Where re-exports may go: none, or an index file that re-exports other files. | | [`structure.environment_readers`](/reference/gspot-toml/#structure.environment_readers) | The files that may read environment variables; other files get the values passed in. | | [`import_rule`](/reference/gspot-toml/#import_rule) | Code may import its own files and the files of every import rule listed above it, never below. can\_also\_import names import rules listed below it. | ## Selected when Always selected.