Cut and paste string cleaning function with diacritics and allowed characters

string-cleaner-function.js

const get_string_sanitizer = (user_maps = {}, user_allowed ) => {
    const build_map = (map_str) => map_str.split(',').map(c => c.split('|')).reduce((dm, [c, r])=> c.split('').reduce((dm, c) => ({...dm, [c]: r.replace('\\u002C', ',')}), {...dm}), {})
    const map_strings = {
        diacritics: '⁰₀⓪⓿０|0,¹₁①⓵❶➀➊１|1,²₂②⓶❷➁➋２|2,³₃③⓷❸➂➌３|3,⁴₄④⓸❹➃➍４|4,⁵₅⑤⓹❺➄➎５|5,⁶₆⑥⓺❻➅➏６|6,⁷₇⑦⓻❼➆➐７|7,⁸₈⑧⓼❽➇➑８|8,⁹₉⑨⓽❾➈➒９|9,⑩⓾❿➉➓|10,⑪⓫|11,⑫⓬|12,⑬⓭|13,⑭⓮|14,⑮⓯|15,⑯⓰|16,⑰⓱|17,⑱⓲|18,⑲⓳|19,⑳⓴|20,ΑÀÁÂÃÄÅĀĂĄƏǍǞǠǺȀȂȦȺᴀḀẠẢẤẦẨẪẬẮẰẲẴẶⒶＡ|A,ÆǢǼᴁ|AE,ΒƁƂɃʙᴃḂḄḆⒷＢ|B,ÇĆĈĊČƇȻʗᴄḈⒸＣ|C,ÈΕÉÊËĒĔĖĘĚƎƐȄȆȨɆᴇḔḖḘḚḜẸẺẼẾỀỂỄỆⒺⱻＥ|E,ÌÍÎÏĨĪĬĮİƖƗǏȈȊɪᵻḬḮỈỊⒾꟾＩΙ|I,ÐĎĐƉƊƋᴅᴆḊḌḎḐḒⒹꝹＤ|D,ÑŃŅŇŊƝǸȠɴᴎṄṆṈṊⓃＮΝ|N,ÒÓÔÕÖØŌŎŐƆƟƠǑǪǬǾȌȎȪȬȮȰᴏᴐṌṎṐṒỌỎỐỒỔỖỘỚỜỞỠỢⓄꝊꝌＯΟ|O,ÙÚÛÜŨŪŬŮŰŲƯǓǕǗǙǛȔȖɄᴜᵾṲṴṶṸṺỤỦỨỪỬỮỰⓊＵ|U,ÝŶŸƳȲɎʏẎỲỴỶỸỾⓎＹΥ|Y,ÞꝦ|TH,ß|ss,àáâãäåāăąǎǟǡǻȁȃȧɐəɚᶏᶕḁẚạảấầẩẫậắằẳẵặₐₔⓐⱥⱯａ|a,æǣǽᴂ|ae,çćĉċčƈȼɕḉↄⓒꜾꜿｃ|c,èéêëēĕėęěǝȅȇȩɇɘɛɜɝɞʚᴈᶒᶓᶔḕḗḙḛḝẹẻẽếềểễệₑⓔⱸｅ|e,ìíîïĩīĭįıǐȉȋɨᴉᵢᵼᶖḭḯỉịⁱⓘｉ|i,ðďđƌȡɖɗᵭᶁᶑḋḍḏḑḓⓓꝺｄ|d,ñńņňʼnŋƞǹȵɲɳᵰᶇṅṇṉṋⁿⓝｎ|n,òóôõöøōŏőơǒǫǭǿȍȏȫȭȯȱɔɵᴖᴗᶗṍṏṑṓọỏốồổỗộớờởỡợₒⓞⱺꝋꝍｏ|o,ùúûüũūŭůűųưǔǖǘǚǜȕȗʉᵤᶙṳṵṷṹṻụủứừửữựⓤｕ|u,ýÿŷƴȳɏʎẏẙỳỵỷỹỿⓨｙ|y,þᵺꝧ|th,ĜĞĠĢƓǤǥǦǧǴɢʛḠⒼꝽꝾＧ|G,ĝğġģǵɠɡᵷᵹᶃḡⓖꝿｇ|g,ĤĦȞʜḢḤḦḨḪⒽⱧⱵＨΗ|H,ĥħȟɥɦʮʯḣḥḧḩḫẖⓗⱨⱶｈ|h,IJ|IJ,ij|ij,ĴɈᴊⒿＪ|J,ĵǰȷɉɟʄʝⓙⱼｊ|j,ĶƘǨᴋḰḲḴⓀⱩꝀꝂꝄＫΚ|K,ķƙǩʞᶄḱḳḵⓚⱪꝁꝃꝅｋ|k,ĸɋʠⓠꝗꝙｑ|q,ĹĻĽĿŁȽʟᴌḶḸḺḼⓁⱠⱢꝆꝈꞀＬ|L,ĺļľŀłƚȴɫɬɭᶅḷḹḻḽⓛⱡꝇꝉꞁｌ|l,Œɶ|OE,œᴔ|oe,ŔŖŘȐȒɌʀʁᴙᴚṘṚṜṞⓇⱤꝚꞂＲ|R,ŕŗřȑȓɍɼɽɾɿᵣᵲᵳᶉṙṛṝṟⓡꝛꞃｒ|r,ŚŜŞŠȘṠṢṤṦṨⓈꜱꞅＳ|S,śŝşšſșȿʂᵴᶊṡṣṥṧṩẜẝⓢꞄｓ|s,ŢŤŦƬƮȚȾᴛṪṬṮṰⓉꞆＴΤ|T,ţťŧƫƭțȶʇʈᵵṫṭṯṱẗⓣⱦｔ|t,ŴǷᴡẀẂẄẆẈⓌⱲＷ|W,ŵƿʍẁẃẅẇẉẘⓦⱳｗ|w,ŹŻŽƵȜȤᴢẐẒẔⓏⱫꝢＺΖ|Z,źżžƶȝȥɀʐʑᵶᶎẑẓẕⓩⱬꝣｚ|z,ƀƃɓᵬᶀḃḅḇⓑｂ|b,ƑḞⒻꜰꝻꟻＦ|F,ƒᵮᶂḟẛⓕꝼｆ|f,ƕ|hv,ƜᴍḾṀṂⓂⱮꟽꟿＭΜ|M,ƤᴘṔṖⓅⱣꝐꝒꝔＰΡ|P,ƥᵱᵽᶈṕṗⓟꝑꝓꝕꟼｐ|p,ƲɅᴠṼṾỼⓋꝞꝨＶ|V,DŽDZ|DZ,DžDz|Dz,dždzʣʥ|dz,LJ|LJ,Lj|Lj,lj|lj,NJ|NJ,Nj|Nj,nj|nj,Ƕ|HV,Ȣᴕ|OU,ȣ|ou,ȸ|db,ȹ|qp,ɊⓆꝖꝘＱ|Q,ɯɰɱᵯᶆḿṁṃⓜｍ|m,ʋʌᵥᶌṽṿⓥⱱⱴꝟｖ|v,ʦ|ts,ʨ|tc,ʪ|ls,ʫ|lz,ᵫ|ue,ᶍẋẍₓⓧｘ|x,ẊẌⓍＸΧ|X,ẞ|SS,Ỻ|LL,ỻ|ll,⑴|(1),⑵|(2),⑶|(3),⑷|(4),⑸|(5),⑹|(6),⑺|(7),⑻|(8),⑼|(9),⑽|(10),⑾|(11),⑿|(12),⒀|(13),⒁|(14),⒂|(15),⒃|(16),⒄|(17),⒅|(18),⒆|(19),⒇|(20),⒈|1.,⒉|2.,⒊|3.,⒋|4.,⒌|5.,⒍|6.,⒎|7.,⒏|8.,⒐|9.,⒑|10.,⒒|11.,⒓|12.,⒔|13.,⒕|14.,⒖|15.,⒗|16.,⒘|17.,⒙|18.,⒚|19.,⒛|20.,⒜|(a),⒝|(b),⒞|(c),⒟|(d),⒠|(e),⒡|(f),⒢|(g),⒣|(h),⒤|(i),⒥|(j),⒦|(k),⒧|(l),⒨|(m),⒩|(n),⒪|(o),⒫|(p),⒬|(q),⒭|(r),⒮|(s),⒯|(t),⒰|(u),⒱|(v),⒲|(w),⒳|(x),⒴|(y),⒵|(z),Ꜩ|TZ,ꜩ|tz,Ꜳ|AA,ꜳ|aa,Ꜵ|AO,ꜵ|ao,Ꜷ|AU,ꜷ|au,ꜸꜺ|AV,ꜹꜻ|av,Ꜽ|AY,ꜽ|ay,Ꝏ|OO,ꝏ|oo,Ꝡ|VY,ꝡ|vy,ff|ff,fi|fi,fl|fl,ffi|ffi,ffl|ffl,st|st',
        alt: '«»“”„″‶❝❞❮❯＂|",‐‑‒–—⁻₋－|-,‘’‚‛′‵‹›❛´❜＇|\u0027,‸＾|^,‼|!!,⁄／|/,⁅❲［|[,⁆❳］|],⁇|??,⁈|?!,⁉|!?,⁎＊|*,⁏；|;,⁒％|%,⁓～˜|~,⁺₊＋|+,⁼₌＝|=,⁽₍❨❪（⟨|(,⁾₎❩❫）⟩|),❬❰＜|<,❭❱＞|>,❴｛|{,❵｝|},⸨|((,⸩|)),！|!,＃|#,＄|$,＆|&,，|\\u002C,¸．|.,：|:,？|?,＠|@,＼|\u005C,＿|_',
    };
    
    const allowed_strings = [
        '!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~', // querty
        '¢£¤¥¦§©¬­®°±µ·º¼½¾×÷ΓΔΘΛΞΠΣΦΨΩαβθπφ†‡•…‰€™←↑→↓↔⇐⇒⇔−∗∝∼≅≈≠≡≤≥⋅◊', // other alt characters
    ]
    const allowed_map = (user_allowed && user_allowed.length)
    ? user_allowed.split('').reduce((map, s) => ({ ...map, [s]: s }), {})
    : allowed_strings.flat().join('').split('').reduce((map, s) => ({ ...map, [s]: s }), {});

    const maps = { ...Object.keys(map_strings).reduce((maps, key) => ({...maps, [key]: build_map(map_strings[key])}), {}), ...user_maps };
    const  api = (string) => { return {
        string,
        diacritics: () => api(string.replace(/[^u0000-u007E]/g, (a) => (maps.diacritics[a] || a))),
        alt: () => api(string.replace(/[^u0000-u007E]/g, (a) => (maps.alt[a] || a))),
        include: () => api(string.replace(/[^u0000-u007E]/g, (a) => (allowed_map[a]) ? allowed_map[a] : (a.match(/[\w\s]+/)) ? a : '')),
    } }
    return api;
}

Example:

string_sanitizer = get_string_sanitizer();
string_sanitizer('＊＊＊Ｓtrîng tö ♠♣♥♦‌‍ȼlěan＊＊＊').diacritics().alt().include().string; // 'String to clean'

map_strings is an object of strings in the format xxxxxxxx|y,xx|y,xx|y , is a comma delimited set of key-value pairs (key-value pairs are pipe delimited) where 'x' is an array of the character(s) to replace and 'y' is the character to replace them with they are used to produce the character maps while keeping the function size as small as possible

allowed_strings is a string composed of the allowed character set (I'm using a joined array to visually segregate the characters even though they have identical behavior)

This could possibly be replaced in many circumstances and simplified using string.normalize , which takes the following "modes" demonstrated below where const junk = "ŔŖŘȐȒɌʀʁᴙᴚṘṚṜṞⓇⱤꝚꞂＲ";

NFC -- Canonical Decomposition, followed by Canonical Composition.
junk.normalize('NFC').replace(/[\u0300-\u036f]/g, ''; // ŔŖŘȐȒɌʀʁᴙᴚṘṚṜṞⓇⱤꝚꞂＲ none replaced

NFKC -- Compatibility Decomposition, followed by Canonical Composition.
junk.normalize('NFKC').replace(/[\u0300-\u036f]/g, ''; // ŔŖŘȐȒɌʀʁᴙᴚṘṚṜṞRⱤꝚꞂR 2 replaced, where ŔŖŘȐȒɌʀʁᴙᴚṘṚṜṞⱤꝚꞂ are unmatched

NFD -- Canonical Decomposition.
junk.normalize('NFD').replace(/[\u0300-\u036f]/g, ''; // RRRRRɌʀʁᴙᴚRRRRⓇⱤꝚꞂＲ 9 replaced, where ɌʀʁᴙᴚⓇⱤꝚꞂＲ are unmatched

NFKD -- Compatibility Decomposition.
junk.normalize('NFKD').replace(/[\u0300-\u036f]/g, ''; // RRRRRɌʀʁᴙᴚRRRRRⱤꝚꞂR with 8 replaced, where ɌʀʁᴙᴚⱤꝚꞂ are unmatched

It looks like there are many attempts in this stackoverflow post, where there may be a better solution for the diacritics portion