My summition at OLX websummit challenge

oneliner.js

var oneLiner = (script, {
  splitter = /( +|\n+|\t+|\/|'|")/g,
  varDeclaration = /^(var|const|let)$/,
  testRegex = '/',
  testString = /'|"/,
  filterer = /[ \n\t]+/
} = {}, prev = '', insideRegex = false, insideString = false) =>
  script
    .split(splitter)
    .map((_) =>
      varDeclaration.test(prev) ||
      insideRegex ||
      insideString ||
      !filterer.test(_)
        ? prev = (
            !insideString && _ === testRegex && (!prev.endsWith('\\') || prev.endsWith('\\\\'))
              ? insideRegex = !insideRegex
              : !insideRegex && testString.test(_) && (!prev.endsWith('\\') || prev.endsWith('\\\\'))
                ? insideString = !insideString
                : false
          ) &&
          false ||
          _
        : insideString || insideRegex ? _ : '')
    .join('')

onliner.min.js

var oneLiner=(script,{splitter=/( +|\n+|\t+|\/|'|")/g,varDeclaration=/^(var|const|let)$/,testRegex='/',testString=/'|"/,filterer=/[ \n\t]+/}={},prev='',insideRegex=false,insideString=false)=>script.split(splitter).map((_)=>varDeclaration.test(prev)||insideRegex||insideString||!filterer.test(_)?prev=(!insideString&&_===testRegex&&(!prev.endsWith('\\')||prev.endsWith('\\\\'))?insideRegex=!insideRegex:!insideRegex&&testString.test(_)&&(!prev.endsWith('\\')||prev.endsWith('\\\\'))?insideString=!insideString:false)&&false||_:insideString||insideRegex?_:'').join('')