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"

Possible duplicate of Sending command line arguments to npm script — mic4ael
– mic4ael, Commented Sep 5, 2016 at 12:24
I checked that question, but I want to embed a param as string to my command in scripts — FarazShuja
– FarazShuja, Commented Sep 5, 2016 at 12:25
See the answer under stackoverflow.com/questions/35221098/… — aleung
– aleung, Commented Oct 22, 2016 at 4:39

hankchiutw · Accepted Answer · 2016-09-05 12:46:06Z

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.

answered Sep 5, 2016 at 12:46

hankchiutw

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Comments

G07cha · Accepted Answer · 2016-09-05 12:38:22Z

0

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"

answered Sep 5, 2016 at 12:38

G07cha

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4 Comments

G07cha Over a year ago

@FarazShuja are you using Linux/macOS?

G07cha Over a year ago

what happens if you run following command TEST=foo && echo $TEST?

FarazShuja Over a year ago

I am using git shell on windows 10, the command output foo for me.

G07cha Over a year ago

So seems like enviroment variables is working fine for you, maybe you really missing file $base_folder/script.js where $base_file is replaced with value that you're using?

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