Error on require when using Node.js pre-7.6

[rivajunior]

I am for the first time trying to minify my php code for increase my score in pagespeed by Google.

But I find that error when I require the plugin gulp-php-minify. You can see in code below.

const {phpMinify} = require('@cedx/gulp-php-minify');

I did the same as the example on the plugin page.

/var/www/project-name/node_modules/@cedx/gulp-php-minify/lib/fast_transformer.js:35
  async close() {
        ^^^^^
SyntaxError: Unexpected identifier
    at createScript (vm.js:56:10)
    at Object.runInThisContext (vm.js:97:10)
    at Module._compile (module.js:542:28)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/var/www/project-name/node_modules/@cedx/gulp-php-minify/lib/index.js:7:25)
    at Module._compile (module.js:570:32)
    at Object.Module._extensions..js (module.js:579:10)
    at Module.load (module.js:487:32)
    at tryModuleLoad (module.js:446:12)
    at Function.Module._load (module.js:438:3)
    at Module.require (module.js:497:17)

[agbottan]

@rivajunior , I had this same problem. It's because of the 'async' keyword which is a new feature in ES7.
I fixed the problem updating my node.js to version 8.
They say it works on version 7, but I didn't tested.

[cedx]

@agbottan found the issue : I'm using async/await functions in this package. These ES2017 features require a Node.js 7.6+ runtime.

@rivajunior, you must either upgrade your Node.js runtime, or downgrade the gulp-php-minify version to 1.1.0 (the last one working with a pre-7.6 runtime). But beware : there was some issues with old versions. You should really consider to upgrade your Node.js runtime (v8 will be the next LTS in a few months).