Derive .npmignore from .gitignore with certain lines omitted as a build script


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00Sep 14, 2019Aug 7, 2018Minified + gzip package size for @brinkdevteam/derive-npmignore in KB


If you use transpilation for your package, you may want to avoid committing the compiled JavaScript to your repository while still publishing your scripts to npmjs. However, npm publish/npm pack will use .gitignore to decide on files to exclude from the package unless you create a .npmignore. Thus, one option you have is to maintain both .gitignore and .npmignore. However, this duplicates code.

With this script, you have a second option. Write .gitignore, mark a few lines as excluded from .npmignore, and you’re done!

The script provided by this package, brinkdevteam-derive-npmignore, will automatically read your .gitignore, filter out any lines between #BEGIN_NPMIGNORE_EXCLUDE and #END_NPMIGNORE_EXCLUDE, and output the result to .npmignore. It will also take any lines between #BEGIN_NPMIGNORE_INCLUDE and #END_NPMIGNORE_INCLUDE and remove exactly one # from the beginning of each line.


This example shows how one might combine this with a pattern of developing in TypeScript and publishing compiled JavaScript files with type definitions.

Note that .npmignore is considered a built file when using this pattern!


# Common editor swap files

# Build/restored


# Ignore built files.

# However, sometimes we need to author and commit custom typings for untyped
# modules or to augment modules which have not been pushed upstream yet. Put
# these *.d.ts files inside of any directory called “types”:


## TypeScript consumers generally cannot handle it when packages
## publish the source .ts depending on what loader is used to consume
## the files.

Put your compilation and call to this sript in the prepare hook which is automatically called by npm pack/npm publish and also called whenever your module is included via a VCS reference.


  "devDependencies": {
    "@brinkdevteam/derive-npmignore": "^1.1.0",
    "typescript": "^3.0.1"
  "scripts": {
    "prepare": "tsc -d && brinkdevteam-derive-npmignore"


brinkdevteam-derive-npmignore [-h] [--] [path-to-.gitignore [path-to-.npmignore]]

  • -h: Prints the basic usage line and exits.

  • --: Disabled interpretation of - for the remainder of the arguments. Useful if you may refer to paths starting with -.

  • path-to-.gitignore: (Default: .gitignore) You may supply the path to the .gitignore file to use as a template. For example, in one of my projects, that is ../../.gitignore. Regardless of the path to .gitignore, .npmignore will be output to the current directory by default.

  • path-to-.npmignore: (Default: .npmignore) You may supply an alternate output path for the .npmignore. For example, you may wish to run this command from outside of the directory which you want to package.

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

The npm package download data comes from npm's download counts api and package details come from npms.io.