Passing parameter to npm run script command

Question

I have npm script defined like this

"scripts": { "compress": "uglifyjs src/script.js -o src/script.js" } 

which I can run by the command npm run compress.

I want to make the name of the base folder i.e. 'src' dynamic, so I can pass the base folder name as param while running the script, something like

npm run compress --base_folder=src 

to run script

"compress": "uglifyjs ${base_folder}/script.js -o ${base_folder}/script.js" 

Answer 1

You need npm-config. Use $npm_config_base_folder in package.json:

"scripts": { "compress": "uglifyjs $npm_config_base_folder/script.js -o $npm_config_base_folder/script.js" } 

Then execute npm run compress --base_folder=src.

Answer 2

The best option will be to use environment variables because npm as far as now doesn't support such complicated logic. In other hand, environment variables offer similar functionality.

command:

base_folder=src npm run compress 

package.json:

"compress": "uglifyjs $base_folder/script.js -o $base_folder/script.js"