@slidoapp/qrcode - npm Package Compare versions

Comparing version 2.0.2 to 2.1.0

build/qrcode.js

@@ -1,1 +0,1 @@
-var QRCode=function(t){"use strict";function r(t){return t&&t.__esModule&&Object.prototype.hasOwnProperty.call(t,"default")?t.default:t}var e,n,o={};function i(){return n?e:(n=1,e=function(){return"function"==typeof Promise&&Promise.prototype&&Promise.prototype.then})}var a,u={},s={};function f(){if(a)return s;var t;a=1;var r=[0,26,44,70,100,134,172,196,242,292,346,404,466,532,581,655,733,815,901,991,1085,1156,1258,1364,1474,1588,1706,1828,1921,2051,2185,2323,2465,2611,2761,2876,3034,3196,3362,3532,3706];return s.getSymbolSize=function(t){if(!t)throw new Error('"version" cannot be null or undefined');if(t<1||t>40)throw new Error('"version" should be in range from 1 to 40');return 4*t+17},s.getSymbolTotalCodewords=function(t){return r[t]},s.getBCHDigit=function(t){for(var r=0;0!==t;)r++,t>>>=1;return r},s.setToSJISFunction=function(r){if("function"!=typeof r)throw new Error('"toSJISFunc" is not a valid function.');t=r},s.isKanjiModeEnabled=function(){return void 0!==t},s.toSJIS=function(r){return t(r)},s}var c,h,d,g,l,v={};function p(){return c||(c=1,function(t){t.L={bit:1},t.M={bit:0},t.Q={bit:3},t.H={bit:2},t.isValid=function(t){return t&&void 0!==t.bit&&t.bit>=0&&t.bit<4},t.from=function(r,e){if(t.isValid(r))return r;try{return function(r){if("string"!=typeof r)throw new Error("Param is not a string");switch(r.toLowerCase()){case"l":case"low":return t.L;case"m":case"medium":return t.M;case"q":case"quartile":return t.Q;case"h":case"high":return t.H;default:throw new Error("Unknown EC Level: "+r)}}(r)}catch(t){return e}}}(v)),v}var w,m={};var E,y={};var A,C={};var B,M={};function I(){if(B)return M;B=1;var t=p(),r=[1,1,1,1,1,1,1,1,1,1,2,2,1,2,2,4,1,2,4,4,2,4,4,4,2,4,6,5,2,4,6,6,2,5,8,8,4,5,8,8,4,5,8,11,4,8,10,11,4,9,12,16,4,9,16,16,6,10,12,18,6,10,17,16,6,11,16,19,6,13,18,21,7,14,21,25,8,16,20,25,8,17,23,25,9,17,23,34,9,18,25,30,10,20,27,32,12,21,29,35,12,23,34,37,12,25,34,40,13,26,35,42,14,28,38,45,15,29,40,48,16,31,43,51,17,33,45,54,18,35,48,57,19,37,51,60,19,38,53,63,20,40,56,66,21,43,59,70,22,45,62,74,24,47,65,77,25,49,68,81],e=[7,10,13,17,10,16,22,28,15,26,36,44,20,36,52,64,26,48,72,88,36,64,96,112,40,72,108,130,48,88,132,156,60,110,160,192,72,130,192,224,80,150,224,264,96,176,260,308,104,198,288,352,120,216,320,384,132,240,360,432,144,280,408,480,168,308,448,532,180,338,504,588,196,364,546,650,224,416,600,700,224,442,644,750,252,476,690,816,270,504,750,900,300,560,810,960,312,588,870,1050,336,644,952,1110,360,700,1020,1200,390,728,1050,1260,420,784,1140,1350,450,812,1200,1440,480,868,1290,1530,510,924,1350,1620,540,980,1440,1710,570,1036,1530,1800,570,1064,1590,1890,600,1120,1680,1980,630,1204,1770,2100,660,1260,1860,2220,720,1316,1950,2310,750,1372,2040,2430];return M.getBlocksCount=function(e,n){switch(n){case t.L:return r[4*(e-1)+0];case t.M:return r[4*(e-1)+1];case t.Q:return r[4*(e-1)+2];case t.H:return r[4*(e-1)+3];default:return}},M.getTotalCodewordsCount=function(r,n){switch(n){case t.L:return e[4*(r-1)+0];case t.M:return e[4*(r-1)+1];case t.Q:return e[4*(r-1)+2];case t.H:return e[4*(r-1)+3];default:return}},M}var T,P,N,b,R={},L={};function U(){return P||(P=1,function(t){var r=function(){if(T)return L;T=1;var t=new Uint8Array(512),r=new Uint8Array(256);return function(){for(var e=1,n=0;n<255;n++)t[n]=e,r[e]=n,256&(e<<=1)&&(e^=285);for(var o=255;o<512;o++)t[o]=t[o-255]}(),L.log=function(t){if(t<1)throw new Error("log("+t+")");return r[t]},L.exp=function(r){return t[r]},L.mul=function(e,n){return 0===e||0===n?0:t[r[e]+r[n]]},L}();t.mul=function(t,e){for(var n=new Uint8Array(t.length+e.length-1),o=0;o<t.length;o++)for(var i=0;i<e.length;i++)n[o+i]^=r.mul(t[o],e[i]);return n},t.mod=function(t,e){for(var n=new 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n=45*r.indexOf(this.data[e]);n+=r.indexOf(this.data[e+1]),t.put(n,11)}this.data.length%2&&t.put(r.indexOf(this.data[e]),6)},$=e}(),o=function(){if(W)return X;W=1;var t=Y();function r(r){this.mode=t.BYTE,this.data="string"==typeof r?(new TextEncoder).encode(r):new Uint8Array(r)}return r.getBitsLength=function(t){return 8*t},r.prototype.getLength=function(){return this.data.length},r.prototype.getBitsLength=function(){return r.getBitsLength(this.data.length)},r.prototype.write=function(t){for(var r=0,e=this.data.length;r<e;r++)t.put(this.data[r],8)},X=r}(),i=function(){if(tt)return G;tt=1;var t=Y(),r=f();function e(r){this.mode=t.KANJI,this.data=r}return e.getBitsLength=function(t){return 13*t},e.prototype.getLength=function(){return this.data.length},e.prototype.getBitsLength=function(){return e.getBitsLength(this.data.length)},e.prototype.write=function(t){var e;for(e=0;e<this.data.length;e++){var 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s,f=r.getBestModeForData(t);if((s=r.from(a,f))!==r.BYTE&&s.bit<f.bit)throw new Error('"'+t+'" cannot be encoded with mode '+r.toString(s)+".\n Suggested mode is: "+r.toString(f));switch(s!==r.KANJI||u.isKanjiModeEnabled()||(s=r.BYTE),s){case r.NUMERIC:return new e(t);case r.ALPHANUMERIC:return new n(t);case r.KANJI:return new i(t);case r.BYTE:return new o(t)}}t.fromArray=function(t){return t.reduce((function(t,r){return"string"==typeof r?t.push(l(r,null)):r.data&&t.push(l(r.data,r.mode)),t}),[])},t.fromString=function(e,n){for(var o=function(t){for(var e=[],n=0;n<t.length;n++){var o=t[n];switch(o.mode){case r.NUMERIC:e.push([o,{data:o.data,mode:r.ALPHANUMERIC,length:o.length},{data:o.data,mode:r.BYTE,length:o.length}]);break;case r.ALPHANUMERIC:e.push([o,{data:o.data,mode:r.BYTE,length:o.length}]);break;case r.KANJI:e.push([o,{data:o.data,mode:r.BYTE,length:c(o.data)}]);break;case r.BYTE:e.push([{data:o.data,mode:r.BYTE,length:c(o.data)}])}}return 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lt(){return ct||(ct=1,function(t){var r=gt();t.render=function(t,e,n){var o=n,i=e;void 0!==o||e&&e.getContext||(o=e,e=void 0),e||(i=function(){try{return document.createElement("canvas")}catch(t){throw new Error("You need to specify a canvas element")}}()),o=r.getOptions(o);var a=r.getImageWidth(t.modules.size,o),u=i.getContext("2d"),s=u.createImageData(a,a);return r.qrToImageData(s.data,t,o),function(t,r,e){t.clearRect(0,0,r.width,r.height),r.style||(r.style={}),r.height=e,r.width=e,r.style.height=e+"px",r.style.width=e+"px"}(u,i,a),u.putImageData(s,0,0),i},t.renderToDataURL=function(r,e,n){var o=n;void 0!==o||e&&e.getContext||(o=e,e=void 0),o||(o={});var i=t.render(r,e,o),a=o.type||"image/png",u=o.rendererOpts||{};return i.toDataURL(a,u.quality)}}(ht)),ht}var vt,pt,wt={};function mt(){if(vt)return wt;vt=1;var t=gt();function r(t,r){var e=t.a/255,n=r+'="'+t.hex+'"';return e<1?n+" "+r+'-opacity="'+e.toFixed(2).slice(1)+'"':n}function e(t,r,e){var n=t+r;return void 0!==e&&(n+=" 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t=p(),r=[1,1,1,1,1,1,1,1,1,1,2,2,1,2,2,4,1,2,4,4,2,4,4,4,2,4,6,5,2,4,6,6,2,5,8,8,4,5,8,8,4,5,8,11,4,8,10,11,4,9,12,16,4,9,16,16,6,10,12,18,6,10,17,16,6,11,16,19,6,13,18,21,7,14,21,25,8,16,20,25,8,17,23,25,9,17,23,34,9,18,25,30,10,20,27,32,12,21,29,35,12,23,34,37,12,25,34,40,13,26,35,42,14,28,38,45,15,29,40,48,16,31,43,51,17,33,45,54,18,35,48,57,19,37,51,60,19,38,53,63,20,40,56,66,21,43,59,70,22,45,62,74,24,47,65,77,25,49,68,81],e=[7,10,13,17,10,16,22,28,15,26,36,44,20,36,52,64,26,48,72,88,36,64,96,112,40,72,108,130,48,88,132,156,60,110,160,192,72,130,192,224,80,150,224,264,96,176,260,308,104,198,288,352,120,216,320,384,132,240,360,432,144,280,408,480,168,308,448,532,180,338,504,588,196,364,546,650,224,416,600,700,224,442,644,750,252,476,690,816,270,504,750,900,300,560,810,960,312,588,870,1050,336,644,952,1110,360,700,1020,1200,390,728,1050,1260,420,784,1140,1350,450,812,1200,1440,480,868,1290,1530,510,924,1350,1620,540,980,1440,1710,570,1036,1530,1800,570,1064,1590,1890,600,1120,1680,1980,630,1204,1770,2100,660,1260,1860,2220,720,1316,1950,2310,750,1372,2040,2430];return 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t.Patterns.PATTERN101:return e*n%2+e*n%3==0;case t.Patterns.PATTERN110:return(e*n%2+e*n%3)%2==0;case t.Patterns.PATTERN111:return(e*n%3+(e+n)%2)%2==0;default:throw new Error("bad maskPattern:"+r)}}t.isValid=function(t){return null!=t&&""!==t&&!isNaN(t)&&t>=0&&t<=7},t.from=function(r){return t.isValid(r)?parseInt(r,10):void 0},t.getPenaltyN1=function(t){for(var e=t.size,n=0,o=0,i=0,a=null,u=null,s=0;s<e;s++){o=i=0,a=u=null;for(var f=0;f<e;f++){var c=t.get(s,f);c===a?o++:(o>=5&&(n+=r+(o-5)),a=c,o=1),(c=t.get(f,s))===u?i++:(i>=5&&(n+=r+(i-5)),u=c,i=1)}o>=5&&(n+=r+(o-5)),i>=5&&(n+=r+(i-5))}return n},t.getPenaltyN2=function(t){for(var r=t.size,n=0,o=0;o<r-1;o++)for(var i=0;i<r-1;i++){var a=t.get(o,i)+t.get(o,i+1)+t.get(o+1,i)+t.get(o+1,i+1);4!==a&&0!==a||n++}return n*e},t.getPenaltyN3=function(t){for(var r=t.size,e=0,o=0,i=0,a=0;a<r;a++){o=i=0;for(var u=0;u<r;u++)o=o<<1&2047|t.get(a,u),u>=10&&(1488===o||93===o)&&e++,i=i<<1&2047|t.get(u,a),u>=10&&(1488===i||93===i)&&e++}return e*n},t.getPenaltyN4=function(t){for(var r=0,e=t.data.length,n=0;n<e;n++)r+=t.data[n];return Math.abs(Math.ceil(100*r/e/5)-10)*o},t.applyMask=function(t,r){for(var e=r.size,n=0;n<e;n++)for(var o=0;o<e;o++)r.isReserved(o,n)||r.xor(o,n,i(t,o,n))},t.getBestMask=function(r,e){for(var n=Object.keys(t.Patterns).length,o=0,i=1/0,a=0;a<n;a++){e(a),t.applyMask(a,r);var u=t.getPenaltyN1(r)+t.getPenaltyN2(r)+t.getPenaltyN3(r)+t.getPenaltyN4(r);t.applyMask(a,r),u<i&&(i=u,o=a)}return o}}(C)),C),s=I(),c=function(){if(b)return N;b=1;var t=U();function r(t){this.genPoly=void 0,this.degree=t,this.degree&&this.initialize(this.degree)}return r.prototype.initialize=function(r){this.degree=r,this.genPoly=t.generateECPolynomial(this.degree)},r.prototype.encode=function(r){if(!this.genPoly)throw new Error("Encoder not initialized");var e=new Uint8Array(r.length+this.degree);e.set(r);var n=t.mod(e,this.genPoly),o=this.degree-n.length;if(o>0){var i=new Uint8Array(this.degree);return i.set(n,o),i}return n},N=r}(),v=O(),B=function(){if(j)return V;j=1;var t=f(),r=t.getBCHDigit(1335);return V.getEncodedBits=function(e,n){for(var o=e.bit<<3|n,i=o<<10;t.getBCHDigit(i)-r>=0;)i^=1335<<t.getBCHDigit(i)-r;return 21522^(o<<10|i)},V}(),M=Y(),T=ut();function P(t,r,e){var n,o,i=t.size,a=B.getEncodedBits(r,e);for(n=0;n<15;n++)o=1==(a>>n&1),n<6?t.set(n,8,o,!0):n<8?t.set(n+1,8,o,!0):t.set(i-15+n,8,o,!0),n<8?t.set(8,i-n-1,o,!0):n<9?t.set(8,15-n-1+1,o,!0):t.set(8,15-n-1,o,!0);t.set(i-8,8,1,!0)}function R(r,n,o){var i=new e;o.forEach((function(t){i.put(t.mode.bit,4),i.put(t.getLength(),M.getCharCountIndicator(t.mode,r)),t.write(i)}));var a=8*(t.getSymbolTotalCodewords(r)-s.getTotalCodewordsCount(r,n));for(i.getLengthInBits()+4<=a&&i.put(0,4);i.getLengthInBits()%8!=0;)i.putBit(0);for(var u=(a-i.getLengthInBits())/8,f=0;f<u;f++)i.put(f%2?17:236,8);return function(r,e,n){for(var o=t.getSymbolTotalCodewords(e),i=s.getTotalCodewordsCount(e,n),a=o-i,u=s.getBlocksCount(e,n),f=u-o%u,h=Math.floor(o/u),d=Math.floor(a/u),g=d+1,l=h-d,v=new c(l),p=0,w=new Array(u),m=new Array(u),E=0,y=new Uint8Array(r.buffer),A=0;A<u;A++){var C=A<f?d:g;w[A]=y.slice(p,p+C),m[A]=v.encode(w[A]),p+=C,E=Math.max(E,C)}var B,M,I=new Uint8Array(o),T=0;for(B=0;B<E;B++)for(M=0;M<u;M++)B<w[M].length&&(I[T++]=w[M][B]);for(B=0;B<l;B++)for(M=0;M<u;M++)I[T++]=m[M][B];return I}(i,r,n)}function L(r,e,u,s){var f;if(Array.isArray(r))f=T.fromArray(r);else{if("string"!=typeof r)throw new Error("Invalid data");var c=e;if(!c){var h=T.rawSplit(r);c=v.getBestVersionForData(h,u)}f=T.fromString(r,c||40)}var d=v.getBestVersionForData(f,u);if(!d)throw new Error("The amount of data is too big to be stored in a QR Code");if(e){if(e<d)throw new Error("\nThe chosen QR Code version cannot contain this amount of data.\nMinimum version required to store current data is: "+d+".\n")}else e=d;var g=R(e,u,f),l=t.getSymbolSize(e),p=new n(l);return function(t,r){for(var e=t.size,n=i.getPositions(r),o=0;o<n.length;o++)for(var a=n[o][0],u=n[o][1],s=-1;s<=7;s++)if(!(a+s<=-1||e<=a+s))for(var f=-1;f<=7;f++)u+f<=-1||e<=u+f||(s>=0&&s<=6&&(0===f||6===f)||f>=0&&f<=6&&(0===s||6===s)||s>=2&&s<=4&&f>=2&&f<=4?t.set(a+s,u+f,!0,!0):t.set(a+s,u+f,!1,!0))}(p,e),function(t){for(var r=t.size,e=8;e<r-8;e++){var n=e%2==0;t.set(e,6,n,!0),t.set(6,e,n,!0)}}(p),function(t,r){for(var e=o.getPositions(r),n=0;n<e.length;n++)for(var i=e[n][0],a=e[n][1],u=-2;u<=2;u++)for(var s=-2;s<=2;s++)-2===u||2===u||-2===s||2===s||0===u&&0===s?t.set(i+u,a+s,!0,!0):t.set(i+u,a+s,!1,!0)}(p,e),P(p,u,0),e>=7&&function(t,r){for(var e,n,o,i=t.size,a=v.getEncodedBits(r),u=0;u<18;u++)e=Math.floor(u/3),n=u%3+i-8-3,o=1==(a>>u&1),t.set(e,n,o,!0),t.set(n,e,o,!0)}(p,e),function(t,r){for(var e=t.size,n=-1,o=e-1,i=7,a=0,u=e-1;u>0;u-=2)for(6===u&&u--;;){for(var s=0;s<2;s++)if(!t.isReserved(o,u-s)){var f=!1;a<r.length&&(f=1==(r[a]>>>i&1)),t.set(o,u-s,f),-1==--i&&(a++,i=7)}if((o+=n)<0||e<=o){o-=n,n=-n;break}}}(p,g),isNaN(s)&&(s=a.getBestMask(p,P.bind(null,p,u))),a.applyMask(s,p),P(p,u,s),{modules:p,version:e,errorCorrectionLevel:u,maskPattern:s,segments:f}}return u.create=function(e,n){if(void 0===e||""===e)throw new Error("No input text");var o,i,u=r.M;return void 0!==n&&(u=r.from(n.errorCorrectionLevel,r.M),o=v.from(n.version),i=a.from(n.maskPattern),n.toSJISFunc&&t.setToSJISFunction(n.toSJISFunc)),L(e,o,u,i)},u}var ft,ct,ht={},dt={};function gt(){return ft||(ft=1,function(t){function r(t){if("number"==typeof t&&(t=t.toString()),"string"!=typeof t)throw new Error("Color should be defined as hex string");var r=t.slice().replace("#","").split("");if(r.length<3||5===r.length||r.length>8)throw new Error("Invalid hex color: "+t);3!==r.length&&4!==r.length||(r=Array.prototype.concat.apply([],r.map((function(t){return[t,t]})))),6===r.length&&r.push("F","F");var e=parseInt(r.join(""),16);return{r:e>>24&255,g:e>>16&255,b:e>>8&255,a:255&e,hex:"#"+r.slice(0,6).join("")}}t.getOptions=function(t){t||(t={}),t.color||(t.color={});var e=void 0===t.margin||null===t.margin||t.margin<0?4:t.margin,n=t.width&&t.width>=21?t.width:void 0,o=t.scale||4;return{width:n,scale:n?4:o,margin:e,color:{dark:r(t.color.dark||"#000000ff"),light:r(t.color.light||"#ffffffff")},type:t.type,rendererOpts:t.rendererOpts||{}}},t.getScale=function(t,r){return r.width&&r.width>=t+2*r.margin?r.width/(t+2*r.margin):r.scale},t.getImageWidth=function(r,e){var n=t.getScale(r,e);return Math.floor((r+2*e.margin)*n)},t.qrToImageData=function(r,e,n){for(var o=e.modules.size,i=e.modules.data,a=t.getScale(o,n),u=Math.floor((o+2*n.margin)*a),s=n.margin*a,f=[n.color.light,n.color.dark],c=0;c<u;c++)for(var h=0;h<u;h++){var d=4*(c*u+h),g=n.color.light;if(c>=s&&h>=s&&c<u-s&&h<u-s)g=f[i[Math.floor((c-s)/a)*o+Math.floor((h-s)/a)]?1:0];r[d++]=g.r,r[d++]=g.g,r[d++]=g.b,r[d]=g.a}}}(dt)),dt}function lt(){return ct||(ct=1,function(t){var r=gt();t.render=function(t,e,n){var o=n,i=e;void 0!==o||e&&e.getContext||(o=e,e=void 0),e||(i=function(){try{return document.createElement("canvas")}catch(t){throw new Error("You need to specify a canvas element")}}()),o=r.getOptions(o);var a=r.getImageWidth(t.modules.size,o),u=i.getContext("2d"),s=u.createImageData(a,a);return r.qrToImageData(s.data,t,o),function(t,r,e){t.clearRect(0,0,r.width,r.height),r.style||(r.style={}),r.height=e,r.width=e,r.style.height=e+"px",r.style.width=e+"px"}(u,i,a),u.putImageData(s,0,0),i},t.renderToDataURL=function(r,e,n){var o=n;void 0!==o||e&&e.getContext||(o=e,e=void 0),o||(o={});var i=t.render(r,e,o),a=o.type||"image/png",u=o.rendererOpts||{};return i.toDataURL(a,u.quality)},t.renderToBlob=function(r,e,n,o){var i=o;void 0!==i||n&&n.getContext||(i=n,n=void 0),i||(i={});var a=t.render(e,n,i),u=i.type||"image/png",s=i.rendererOpts||{};a.toBlob(r,u,s.quality)}}(ht)),ht}var vt,pt,wt={};function mt(){if(vt)return wt;vt=1;var t=gt();function r(t,r){var e=t.a/255,n=r+'="'+t.hex+'"';return e<1?n+" "+r+'-opacity="'+e.toFixed(2).slice(1)+'"':n}function e(t,r,e){var n=t+r;return void 0!==e&&(n+=" "+e),n}return wt.render=function(n,o,i){var a=t.getOptions(o),u=n.modules.size,s=n.modules.data,f=u+2*a.margin,c=a.color.light.a?"<path "+r(a.color.light,"fill")+' d="M0 0h'+f+"v"+f+'H0z"/>':"",h="<path "+r(a.color.dark,"stroke")+' d="'+function(t,r,n){for(var o="",i=0,a=!1,u=0,s=0;s<t.length;s++){var f=Math.floor(s%r),c=Math.floor(s/r);f||a||(a=!0),t[s]?(u++,s>0&&f>0&&t[s-1]||(o+=a?e("M",f+n,.5+c+n):e("m",i,0),i=0,a=!1),f+1<r&&t[s+1]||(o+=e("h",u),u=0)):i++}return o}(s,u,a.margin)+'"/>',d='viewBox="0 0 '+f+" "+f+'"',g='<svg xmlns="http://www.w3.org/2000/svg" '+(a.width?'width="'+a.width+'" height="'+a.width+'" ':"")+d+' shape-rendering="crispEdges">'+c+h+"</svg>\n";return"function"==typeof i&&i(null,g),g},wt}var Et=function(){if(pt)return o;pt=1;var t=i(),r=st(),e=lt(),n=mt();function a(e,n,o,i,a){var u=[].slice.call(arguments,1),s=u.length,f="function"==typeof u[s-1];if(!f&&!t())throw new Error("Callback required as last argument");if(!f){if(s<1)throw new Error("Too few arguments provided");return 1===s?(o=n,n=i=void 0):2!==s||n.getContext||(i=o,o=n,n=void 0),new Promise((function(t,a){try{var u=r.create(o,i);t(e(u,n,i))}catch(t){a(t)}}))}if(s<2)throw new Error("Too few arguments provided");2===s?(a=o,o=n,n=i=void 0):3===s&&(n.getContext&&void 0===a?(a=i,i=void 0):(a=i,i=o,o=n,n=void 0));try{var c=r.create(o,i);a(null,e(c,n,i))}catch(t){a(t)}}return o.create=r.create,o.toCanvas=a.bind(null,e.render),o.toDataURL=a.bind(null,e.renderToDataURL),o.toString=a.bind(null,(function(t,r,e){return n.render(t,e)})),o}(),yt=r(Et);return t.default=yt,Object.defineProperty(t,"__esModule",{value:!0}),t}({});

lib/renderer/canvas.js

@@ -64,1 +64,19 @@ const Utils = require('./utils')
 }
+
+exports.renderToBlob = function renderToBlob (cb, qrData, canvas, options) {
+  let opts = options
+
+  if (typeof opts === 'undefined' && (!canvas || !canvas.getContext)) {
+    opts = canvas
+    canvas = undefined
+  }
+
+  if (!opts) opts = {}
+
+  const canvasEl = exports.render(qrData, canvas, opts)
+
+  const type = opts.type || 'image/png'
+  const rendererOpts = opts.rendererOpts || {}
+
+  canvasEl.toBlob(cb, type, rendererOpts.quality)
+}

package.json

 {
   "name": "@slidoapp/qrcode",
   "description": "Generate Quick Response (QR) codes using JavaScript in a browser, server side code, or using a command line tool.",
-  "version": "2.0.2",
+  "version": "2.1.0",
   "author": "Ryan Day <[e-mail]>",
@@ -6,0 +6,0 @@ "contributors": [

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