Weird variables appearing in output bundle

[boonware]

I have used the Linkify React component to create links within text. When I run my production Webpack build (via CRA) the output JavaScript bundle contains the following weird local variables (both are truncated here as they are multiple lines long):

Xl="aaa1rp3bb0ott3vie4c1le2ogado5udhabi7c0ademy5centure6ountant0s9o1tor4d0s1ult4e0g1ro2tna4f0l1rica5g0akhan5ency5i0g1rbus3force ...

and

Jl="\u03b5\u03bb1\u03c52\u0431\u04331\u0435\u043b3\u0434\u0435\u0442\u04384\u0435\u044e2\u043a\u0430\u0442\u043e\u043b ...

If I remove the <Linkify> component and render plain text as before, these variables are not in the Webpack output JavaScript. What is going on here? I can notice what appear to be broken-up words in the first string such as "xbox", "scholarships", "hamburg", "livery", "business" and so on. Where is this garbage coming from? The app fails to run with the error "Invalid unicode escape sequence" due to the second variable Jl.

To emphasize, if the only change I make is to remove the <Linkify> tag, everything works fine and these variables are gone.

[boonware]

After a little more digging, these variables are actually the following, where I assume the Webpack build reduces the variable name to a smaller size:

const encodedTlds = 'aaa1rp3bb0ott3vie4c1le2ogado5udhabi7c0ademy5centure6ountant0s9o1tor4d0s1ult4e0g1ro2tna4f0l1rica5g0akhan5ency5i0g1rbus3force5tel5kdn3l0ibaba4pay4lfinanz6state5y2sace3tom5m0azon4ericanexpress7family11x2fam3ica3sterdam8nalytics7droid5quan4z2o0l2partments8p0le4q0uarelle8r0ab1mco4chi3my2pa2t0e3s0da2ia2sociates9t0hleta5torney7u0ction5di0ble3o3spost5thor3o0s4vianca6w0s2x0a2z0ure5ba0by2idu3namex3narepublic11d1k2r0celona5laycard4s5efoot5gains6seball5ketball8uhaus5yern5b0c1t1va3cg1n2d1e0ats2uty4er2ntley5rlin4st0buy5t2f1g1h0arti5i0ble3d1ke2ng0o3o1z2j1lack0friday9ockbuster8g1omberg7ue3m0s1w2n0pparibas9o0ats3ehringer8fa2m1nd2o0k0ing5sch2tik2on4t1utique6x2r0adesco6idgestone9oadway5ker3ther5ussels7s1t1uild0ers6siness6y1zz3v1w1y1z0h3ca0b1fe2l0l1vinklein9m0era3p2non3petown5ital0one8r0avan4ds2e0er0s4s2sa1e1h1ino4t0ering5holic7ba1n1re3c1d1enter4o1rn3f0a1d2g1h0anel2nel4rity4se2t2eap3intai5ristmas6ome4urch5i0priani6rcle4sco3tadel4i0c2y3k1l0aims4eaning6ick2nic1que6othing5ud3ub0med6m1n1o0ach3des3ffee4llege4ogne5m0cast4mbank4unity6pany2re3uter5sec4ndos3struction8ulting7tact3ractors9oking4l1p2rsica5untry4pon0s4rses6pa2r0edit0card4union9icket5own3s1uise0s6u0isinella9v1w1x1y0mru3ou3z2dabur3d1nce3ta1e1ing3sun4y2clk3ds2e0al0er2s3gree4livery5l1oitte5ta3mocrat6ntal2ist5si0gn4v2hl2iamonds6et2gital5rect0ory7scount3ver5h2y2j1k1m1np2o0cs1tor4g1mains5t1wnload7rive4tv2ubai3nlop4pont4rban5vag2r2z2earth3t2c0o2deka3u0cation8e1g1mail3erck5nergy4gineer0ing9terprises10pson4quipment8r0icsson6ni3s0q1tate5t1u0rovision8s2vents5xchange6pert3osed4ress5traspace10fage2il1rwinds6th3mily4n0s2rm0ers5shion4t3edex3edback6rrari3ero6i0delity5o2lm2nal1nce1ial7re0stone6mdale6sh0ing5t0ness6j1k1lickr3ghts4r2orist4wers5y2m1o0o0d1tball6rd1ex2sale4um3undation8x2r0ee1senius7l1ogans4ntier7tr2ujitsu5n0d2rniture7tbol5yi3ga0l0lery3o1up4me0s3p1rden4y2b0iz3d0n2e0a1nt0ing5orge5f1g0ee3h1i0ft0s3ves2ing5l0ass3e1obal2o4m0ail3bh2o1x2n1odaddy5ld0point6f2o0dyear5g0le4p1t1v2p1q1r0ainger5phics5tis4een3ipe3ocery4up4s1t1u0ardian6cci3ge2ide2tars5ru3w1y2hair2mburg5ngout5us3bo2dfc0bank7ealth0care8lp1sinki6re1mes5iphop4samitsu7tachi5v2k0t2m1n1ockey4ldings5iday5medepot5goods5s0ense7nda3rse3spital5t0ing5t0els3mail5use3w2r1sbc3t1u0ghes5yatt3undai7ibm2cbc2e1u2d1e0ee3fm2kano4l1m0amat4db2mo0bilien9n0c1dustries8finiti5o2g1k1stitute6urance4e4t0ernational10uit4vestments10o1piranga7q1r0ish4s0maili5t0anbul7t0au2v3jaguar4va3cb2e0ep2tzt3welry6io2ll2m0p2nj2o0bs1urg4t1y2p0morgan6rs3uegos4niper7kaufen5ddi3e0rryhotels6logistics9properties14fh2g1h1i0a1ds2m1ndle4tchen5wi3m1n1oeln3matsu5sher5p0mg2n2r0d1ed3uokgroup8w1y0oto4z2la0caixa5mborghini8er3ncaster6d0rover6xess5salle5t0ino3robe5w0yer5b1c1ds2ease3clerc5frak4gal2o2xus4gbt3i0dl2fe0insurance9style7ghting6ke2lly3mited4o2ncoln4k2psy3ve1ing5k1lc1p2oan0s3cker3us3l1ndon4tte1o3ve3pl0financial11r1s1t0d0a3u0ndbeck6xe1ury5v1y2ma0drid4if1son4keup4n0agement7go3p1rket0ing3s4riott5shalls7ttel5ba2c0kinsey7d1e0d0ia3et2lbourne7me1orial6n0u2rckmsd7g1h1iami3crosoft7l1ni1t2t0subishi9k1l0b1s2m0a2n1o0bi0le4da2e1i1m1nash3ey2ster5rmon3tgage6scow4to0rcycles9v0ie4p1q1r1s0d2t0n1r2u0seum3ic4v1w1x1y1z2na0b1goya4me2tura4vy3ba2c1e0c1t0bank4flix4work5ustar5w0s2xt0direct7us4f0l2g0o2hk2i0co2ke1on3nja3ssan1y5l1o0kia3rton4w0ruz3tv4p1r0a1w2tt2u1yc2z2obi1server7ffice5kinawa6layan0group9dnavy5lo3m0ega4ne1g1l0ine5oo2pen3racle3nge4g0anic5igins6saka4tsuka4t2vh3pa0ge2nasonic7ris2s1tners4s1y3y2ccw3e0t2f0izer5g1h0armacy6d1ilips5one2to0graphy6s4ysio5ics1tet2ures6d1n0g1k2oneer5zza4k1l0ace2y0station9umbing5s3m1n0c2ohl2ker3litie5rn2st3r0america6xi3ess3ime3o0d0uctions8f1gressive8mo2perties3y5tection8u0dential9s1t1ub2w0c2y2qa1pon3uebec3st5racing4dio4e0ad1lestate6tor2y4cipes5d0stone5umbrella9hab3ise0n3t2liance6n0t0als5pair3ort3ublican8st0aurant8view0s5xroth6ich0ardli6oh3l1o1p2o0cks3deo3gers4om3s0vp3u0gby3hr2n2w0e2yukyu6sa0arland6fe0ty4kura4le1on3msclub4ung5ndvik0coromant12ofi4p1rl2s1ve2xo3b0i1s2c0a1b1haeffler7midt4olarships8ol3ule3warz5ience5ot3d1e0arch3t2cure1ity6ek2lect4ner3rvices6ven3w1x0y3fr2g1h0angrila6rp2w2ell3ia1ksha5oes2p0ping5uji3w3i0lk2na1gles5te3j1k0i0n2y0pe4l0ing4m0art3ile4n0cf3o0ccer3ial4ftbank4ware6hu2lar2utions7ng1y2y2pa0ce3ort2t3r0l2s1t0ada2ples4r1tebank4farm7c0group6ockholm6rage3e3ream4udio2y3yle4u0cks3pplies3y2ort5rf1gery5zuki5v1watch4iss4x1y0dney4stems6z2tab1ipei4lk2obao4rget4tamotors6r2too4x0i3c0i2d0k2eam2ch0nology8l1masek5nnis4va3f1g1h0d1eater2re6iaa2ckets5enda4ps2res2ol4j0maxx4x2k0maxx5l1m0all4n1o0day3kyo3ols3p1ray3shiba5tal3urs3wn2yota3s3r0ade1ing4ining5vel0ers0insurance16ust3v2t1ube2i1nes3shu4v0s2w1z2ua1bank3s2g1k1nicom3versity8o2ol2ps2s1y1z2va0cations7na1guard7c1e0gas3ntures6risign5mögensberater2ung14sicherung10t2g1i0ajes4deo3g1king4llas4n1p1rgin4sa1ion4va1o3laanderen9n1odka3lvo3te1ing3o2yage5u2wales2mart4ter4ng0gou5tch0es6eather0channel12bcam3er2site5d0ding5ibo2r3f1hoswho6ien2ki2lliamhill9n0dows4e1ners6me2olterskluwer11odside6rk0s2ld3w2s1tc1f3xbox3erox4finity6ihuan4n2xx2yz3yachts4hoo3maxun5ndex5e1odobashi7ga2kohama6u0tube6t1un3za0ppos4ra3ero3ip2m1one3uerich6w2';

const encodedUtlds = 'ελ1υ2бг1ел3дети4ею2католик6ом3мкд2он1сква6онлайн5рг3рус2ф2сайт3рб3укр3қаз3հայ3ישראל5קום3ابوظبي5رامكو5لاردن4بحرين5جزائر5سعودية6عليان5مغرب5مارات5یران5بارت2زار4يتك3ھارت5تونس4سودان3رية5شبكة4عراق2ب2مان4فلسطين6قطر3كاثوليك6وم3مصر2ليسيا5وريتانيا7قع4همراه5پاکستان7ڀارت4कॉम3नेट3भारत0म्3ोत5संगठन5বাংলা5ভারত2ৰত4ਭਾਰਤ4ભારત4ଭାରତ4இந்தியா6லங்கை6சிங்கப்பூர்11భారత్5ಭಾರತ4ഭാരതം5ලංකා4คอม3ไทย3ລາວ3გე2みんな3アマゾン4クラウド4グーグル4コム2ストア3セール3ファッション6ポイント4世界2中信1国1國1文网3亚马逊3企业2佛山2信息2健康2八卦2公司1益2台湾1灣2商城1店1标2嘉里0大酒店5在线2大拿2天主教3娱乐2家電2广东2微博2慈善2我爱你3手机2招聘2政务1府2新加坡2闻2时尚2書籍2机构2淡马锡3游戏2澳門2点看2移动2组织机构4网址1店1站1络2联通2谷歌2购物2通販2集团2電訊盈科4飞利浦3食品2餐厅2香格里拉3港2닷넷1컴2삼성2한국2';

[boonware]

From more digging, it turns out that the variables above are the encodedTlds and encodedUtlds after compilation (see here).

The browser is complaining that the character "\ua3" is invalid. Relevant part of the encoded string:

... \u4e9a\u9a6c\ua3\u4f01\u4e1a2\ ...

[nfrasser]

It looks like your webpack config is having trouble with this section of the encodedUtlds string:

亚马逊3企业

Specifically 逊 is getting converted to \ua, but it should be \u900a. Is there something special in your config related to the number 900? A global find/replace maybe? Could you post a minimal webpack config/project that reproduces this?