vim

([]+{})[4].js

(({}+[])[4]+String(new Map([((Map) => {[String()]+{}})]))[8]+String(this)[([]+{}).charCodeAt()-({}+[[{Object}]])[8].charCodeAt()]+String.fromCharCode([Map+[this+[()=>{map(() => ([]+{}))}]],Object.keys([]+{})].map(() => (([[this],{this:[this]},{Map}+[]].map((l) => (l+[]+{})).join().match(/o/g).length+([]+{}).length)/(([[]+{},String([Map, {}+Object])]).length))-(([[]+{},String([Map, {}+Object])]).length)).join("")))+([Object.keys ? [[].fill]:{fill:fill(fill)[fill].fill(fill)}].join(([{},[]]) => {[[]+{}].keys})? String([unescape(unescape)].map(()=>unescape))[parseInt((((([]+[]/[]).length-[]/[]+{}).length)+[])[0]+((([[[([([].reduce)]*Object())]]+[].map((NaN)=>[[this],[]])].map(({})=>[[{}+[]],[()=>[].join(this)]]).map(({})=>[,,[,]])+[].length+",").length)-2))] : ([{_:[]}]).map(unescape))