A static analysis tool for JavaScript which examines surface area of ES6 modules throughout your codebase


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Chipper 🔬

Chipper |'tʃɪpə| adjective, informal, Northern England

cheerful and lively

What is Chipper?

Chipper is a static analysis tool which examines ES6 imports and CommonJS requires across your codebase.

Why use Chipper?

You can use Chipper to find out:

What are the consumers of a module, directory of modules, a 3rd party dependency or an alias?

$ chipper surface lodash

What are all the dependencies of a module or a directory of modules?

$ chipper dependencies src/services/

Which modules can make use of an alias definition?

$ chipper naylias my-utils --alias my-utils:src/utils/

Does module X depend on module Y?

$ chipper dependent controllers/products/getProducts/index.js database.js


You can install chipper globally via npm.

npm i chipper -g

CLI should be available after installation, type chipper and you should see the help screen.


Chipper has 3 commands surface, dependencies, and naylias. A scan is done when you run chipper for the first time. After the scan is complete, chipper will cache the results in .chipper directory. You can find the raw scan data in json files.

surface and dependencies commands produce a HTML report.

naylias command prints the list of modules that could use as alias.


All 3 chipper commands accepts the same set of options. All options have defaults set, so you only need to pass them if you need to change the default behaviour.

--target-dir        Target scan directory

You can pass a relative path. Chipper will look for all files under that directory to scan for imports. By default this will be set to the current working directory.

--project-root      Project root path                                                             

You can set project root path by passing an absolute path. By default this will be set to the directory where you are running the chipper command from.

--ext              File extensions to be matched 

You can pass a list of file extensions to be searched for. By default chipper will only scan for .js files. You can pass multiple extensions by doing --ext js,mjs,ts

--incl             Glob patterns to include in scan                            

You can pass list of glob patterns to search for files *.js,*.ts. By default it will match all js files in all directories recursively. **/*.js

--excl             Glob patterns to exclude in scan                                              

You can pass a list of globals to be excluded from scan. By default everything under node_modules directory would be ignored.

--alias            Alias used within your project. 

You can define aliases used within your project using the --alias option followed by the absolute path to aliased directory. Chipper can consume multiple alias options.

--rescan           Invalidates chipper cache and forces a rescan

Chipper caches scan results in the .chipper directory by calculating a hash of all the options. If Chipper is re-run with the same options, instead of doing a scan it will use the cached data. Passing --rescan option will invalidate the cache and do a full scan.


surface (surf for short)

You can use the surface command to see all dependents of a certain module, a directory of modules, a 3rd party dependency from node_modules, or an alias.

See all modules which rely on lodash:

chipper surface lodash

See all modules which rely on a local module: chipper surface src/utils/calculateDuration.js

See all modules which rely on a directory of modules:

chipper surface src/utils/

See all modules which rely on an alias:

chipper surface my-awesome-services --alias my-awesome-services:/home/my-project/src/utils

dependencies (dep for short)

You can use dependencies command to see a list of all imports by a module or a directory of modules.

See all dependencies of all chipper dependencies src/utils/calculateDuration.js

See all dependencies of all JS modules under src/utils directory. chipper dependencies src/utils/

It's also possible to use the dependencies command with an alias.

naylias (nay)

You can use naylias command to find out if any JavaScript module in your project is not making use of an alias definition.

chipper naylias my-awesome-services --alias my-awesome-services:/home/my-project/src/utils


You can use dependent command to find out if a module depends on another module. This dependency can be a direct one, or a nested one. Chipper will show you the graph if a dependency is found.

$ chipper dependent /controllers/products/getProducts/index.js database.js  --alias '~root':/Users/erselaker/api 

└─┬  /actions/products/fetchUnmappedProducts/index.js
  └─┬  /actions/products/fetchUnmappedProducts/queries/selectUnmappedProducts.js
    └──  /api/database.js


Currently only root level imports are supported.

Dynamic imports are not supported.


Feedback and contributions are welcome. Feel free to open issues if you encounter any problems.

If you find any bugs or have a feature request, please open an issue on github!

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