npm run script causes Windows Script Host error

Question

I a trying to use npm to minify javascript.

This is my package.json:

{
  "name": "name1",
  "version": "1.0.0",
  "description": "",
  "scripts": {
    "minifyjs": "minifyJs",
    "minifycss": "minifyCss",
    "minifyhtml": "minifyHtml"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "clean-css": "^3.4.19",
    "html-minifier": "^3.0.2",
    "uglify-js": "^2.7.0"
  }
}

and my minifyJs script is :

var uglifyJS = require('uglify-js');
var fs = require('fs');

var result = uglifyJS.minify(['src/main1.js', 'src/main2.js'], {
    compress: {
        drop_console: true,
        unused: true
    }
});
fs.writeFileSync('dist/minifyJs.js', result.code);

When I call npm run minifyjs I get the following error:

What am I doing wrong - btw this was working on another machine.....

Can anyone help?

Answer 1

The entries under scripts are commands that are run by NPM. They are not simply paths to JavaScript files.

You need to tell NPM to run your JavaScript tasks using node:

...
"scripts": {
  "minifyjs": "node minifyJs",
  "minifycss": "node minifyCss",
  "minifyhtml": "node minifyHtml"
},
...