quine.js

const space = String.fromCharCode(32)
const at_symbol = String.fromCharCode(64)
const newline = String.fromCharCode(10)
const openb = String.fromCharCode(91)
const closb = String.fromCharCode(93)
const quote = String.fromCharCode(39)
const comma = String.fromCharCode(44)
function represent(ss) {
  return ss.join(newline).replace(
    at_symbol,
    openb + newline + ss.map(function(s) {
      return space + space + quote + s + quote
    }).join(comma + newline) + newline + closb
  )
}
const ss = [
  'const space = String.fromCharCode(32)',
  'const at_symbol = String.fromCharCode(64)',
  'const newline = String.fromCharCode(10)',
  'const openb = String.fromCharCode(91)',
  'const closb = String.fromCharCode(93)',
  'const quote = String.fromCharCode(39)',
  'const comma = String.fromCharCode(44)',
  'function represent(ss) {',
  '  return ss.join(newline).replace(',
  '    at_symbol,',
  '    openb + newline + ss.map(function(s) {',
  '      return space + space + quote + s + quote',
  '    }).join(comma + newline) + newline + closb',
  '  )',
  '}',
  'const ss = @',
  'console.log(represent(ss))'
]
console.log(represent(ss))