node-minify gets stuck or outputs "undefined" as content

I’m running --compressor all on a large file, for example: https://raw.githubusercontent.com/hems/efx-api-node/master/dist/efx-a3a245411be.js

but all i get on my console is a stuck screen:

node version: v9.1.1

and this is my package.json:

....
  "scripts": {
    "build": "npm run build:web:browserify; npm run build:web:minify; npm run build:web:hash",
    "build:web:browserify": "del ./dist/efx*.js; browserify ./src/efx.js --standalone EFX -o ./dist/efx.js",
    "build:web:minify": "node-minify --compressor all --input './dist/efx.js' --output './dist/efx.min.js'",
    "build:web:hash": "hash-filename ./dist/efx*.js;del ./dist/efx.js",
    "build:web:run": "browserify --debug ./src/efx.js --standalone EFX | browser-run --port 2222"
  },
  "dependencies": {
    "0x.js": "^0.38.4",
    "bluebird": "^3.5.1",
    "ethereumjs-util": "^5.2.0",
    "lodash": "^4.17.10",
    "request": "^2.87.0",
    "request-promise": "^4.2.2"
  },
  "devDependencies": {
    "browser-run": "^5.0.0",
    "browserify": "^16.2.2",
    "chai": "^4.1.2",
    "del-cli": "^1.1.0",
    "ganache-cli": "^6.1.4",
    "hash-filename": "^1.0.4",
    "mocha": "^5.1.1",
    "mochify": "^5.8.0",
    "nock": "^9.4.1",
    "node-minify": "^3.1.0",
    "standard": "^11.0.1",
    "web3": "^1.0.0-beta.34"
  }

Here is the repository with the code that is yielding that issue: https://github.com/hems/efx-api-node

You should be able to reproduce the problem by:

git clone
cd efx-api-node
npm install
npm run build:web:browserify
npm run build:webminify
# by now you can go to ./dist and you will see the .min.js file content is "undefined"

I have tried running something like compressor --uglify but the best i can get is a file with “undefined” written inside.

What am i doing wrong?

[geunho]

Looks like uglify-js has an issue on minify js files written in es6 convention.

I resolved it by : require('uglify-js') -> require('uglify-es') on https://github.com/srod/node-minify/blob/develop/lib/compressors/uglifyjs.js#L13

[srod]

I’ve released 3.2.0, and added uglify-es. I tested with efx-api-node, it’s ok with it.