diff --git a/browser-source-map-support.js b/browser-source-map-support.js
index 37ac188..9a0b6ef 100644
--- a/browser-source-map-support.js
+++ b/browser-source-map-support.js
@@ -8,107 +8,107 @@
  @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>
  license  MIT
 */
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-"line"),generatedColumn:d.getArg(a,"column")};a=this._findMapping(e,this._generatedMappings,"generatedLine","generatedColumn",d.compareByGeneratedPositionsDeflated,d.getArg(a,"bias",b.GREATEST_LOWER_BOUND));if(0<=a&&(a=this._generatedMappings[a],a.generatedLine===e.generatedLine)){e=d.getArg(a,"source",null);null!==e&&(e=this._sources.at(e),e=d.computeSourceURL(this.sourceRoot,e,this._sourceMapURL));var c=d.getArg(a,"name",null);null!==c&&(c=this._names.at(c));return{source:e,line:d.getArg(a,"originalLine",
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-d.getArg(a,"source");null!=this.sourceRoot&&(e=d.relative(this.sourceRoot,e));if(!this._sources.has(e))return{line:null,column:null,lastColumn:null};e=this._sources.indexOf(e);e={source:e,originalLine:d.getArg(a,"line"),originalColumn:d.getArg(a,"column")};a=this._findMapping(e,this._originalMappings,"originalLine","originalColumn",d.compareByOriginalPositions,d.getArg(a,"bias",b.GREATEST_LOWER_BOUND));return 0<=a&&(a=this._originalMappings[a],a.source===e.source)?{line:d.getArg(a,"generatedLine",
-null),column:d.getArg(a,"generatedColumn",null),lastColumn:d.getArg(a,"lastGeneratedColumn",null)}:{line:null,column:null,lastColumn:null}};m.BasicSourceMapConsumer=e;h.prototype=Object.create(b.prototype);h.prototype.constructor=b;h.prototype._version=3;Object.defineProperty(h.prototype,"sources",{get:function(){for(var a=[],b=0;b<this._sections.length;b++)for(var c=0;c<this._sections[b].consumer.sources.length;c++)a.push(this._sections[b].consumer.sources[c]);return a}});h.prototype.originalPositionFor=
-function(b){var e={generatedLine:d.getArg(b,"line"),generatedColumn:d.getArg(b,"column")},c=a.search(e,this._sections,function(a,b){var c=a.generatedLine-b.generatedOffset.generatedLine;return c?c:a.generatedColumn-b.generatedOffset.generatedColumn});return(c=this._sections[c])?c.consumer.originalPositionFor({line:e.generatedLine-(c.generatedOffset.generatedLine-1),column:e.generatedColumn-(c.generatedOffset.generatedLine===e.generatedLine?c.generatedOffset.generatedColumn-1:0),bias:b.bias}):{source:null,
-line:null,column:null,name:null}};h.prototype.hasContentsOfAllSources=function(){return this._sections.every(function(a){return a.consumer.hasContentsOfAllSources()})};h.prototype.sourceContentFor=function(a,b){for(var c=0;c<this._sections.length;c++){var d=this._sections[c].consumer.sourceContentFor(a,!0);if(d)return d}if(b)return null;throw Error('"'+a+'" is not in the SourceMap.');};h.prototype.generatedPositionFor=function(a){for(var b=0;b<this._sections.length;b++){var c=this._sections[b];if(-1!==
-c.consumer.sources.indexOf(d.getArg(a,"source"))){var k=c.consumer.generatedPositionFor(a);if(k)return{line:k.line+(c.generatedOffset.generatedLine-1),column:k.column+(c.generatedOffset.generatedLine===k.line?c.generatedOffset.generatedColumn-1:0)}}}return{line:null,column:null}};h.prototype._parseMappings=function(a,b){this.__generatedMappings=[];this.__originalMappings=[];for(var c=0;c<this._sections.length;c++)for(var k=this._sections[c],e=k.consumer._generatedMappings,g=0;g<e.length;g++){var l=
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+for(var r=q(c.split("/")),k=q(l.split("/")),u=Math.min(r.length,k.length),d=u,g=0;g<u;g++)if(r[g]!==k[g]){d=g;break}u=[];for(g=d;g<r.length;g++)u.push("..");u=u.concat(k.slice(d));return u.join("/")};A.sep="/";A.delimiter=":";A.dirname=function(c){var l=m.exec(c).slice(1);c=l[0];l=l[1];if(!c&&!l)return".";l&&(l=l.substr(0,l.length-1));return c+l};A.basename=function(c,l){var q=m.exec(c).slice(1)[2];l&&q.substr(-1*l.length)===l&&(q=q.substr(0,q.length-l.length));return q};A.extname=function(c){return m.exec(c).slice(1)[3]};
+var f="b"==="ab".substr(-1)?function(c,l,q){return c.substr(l,q)}:function(c,l,q){0>l&&(l=c.length+l);return c.substr(l,q)}}).call(this,C("g5I+bs"))},{"g5I+bs":9}],9:[function(C,J,A){function e(){}C=J.exports={};C.nextTick=function(){if("undefined"!==typeof window&&window.setImmediate)return function(t){return window.setImmediate(t)};if("undefined"!==typeof window&&window.postMessage&&window.addEventListener){var p=[];window.addEventListener("message",function(t){var m=t.source;m!==window&&null!==
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+10:[function(C,J,A){function e(){this._array=[];this._set=m?new Map:Object.create(null)}var p=C("./util"),t=Object.prototype.hasOwnProperty,m="undefined"!==typeof Map;e.fromArray=function(f,c){for(var l=new e,q=0,r=f.length;q<r;q++)l.add(f[q],c);return l};e.prototype.size=function(){return m?this._set.size:Object.getOwnPropertyNames(this._set).length};e.prototype.add=function(f,c){var l=m?f:p.toSetString(f),q=m?this.has(f):t.call(this._set,l),r=this._array.length;q&&!c||this._array.push(f);q||(m?
+this._set.set(f,r):this._set[l]=r)};e.prototype.has=function(f){if(m)return this._set.has(f);f=p.toSetString(f);return t.call(this._set,f)};e.prototype.indexOf=function(f){if(m){var c=this._set.get(f);if(0<=c)return c}else if(c=p.toSetString(f),t.call(this._set,c))return this._set[c];throw Error('"'+f+'" is not in the set.');};e.prototype.at=function(f){if(0<=f&&f<this._array.length)return this._array[f];throw Error("No element indexed by "+f);};e.prototype.toArray=function(){return this._array.slice()};
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+J,A){var e="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".split("");A.encode=function(p){if(0<=p&&p<e.length)return e[p];throw new TypeError("Must be between 0 and 63: "+p);};A.decode=function(p){return 65<=p&&90>=p?p-65:97<=p&&122>=p?p-97+26:48<=p&&57>=p?p-48+52:43==p?62:47==p?63:-1}},{}],13:[function(C,J,A){function e(p,t,m,f,c,l){var q=Math.floor((t-p)/2)+p,r=c(m,f[q],!0);return 0===r?q:0<r?1<t-q?e(q,t,m,f,c,l):l==A.LEAST_UPPER_BOUND?t<f.length?t:-1:q:1<q-p?e(p,q,m,f,c,l):l==
+A.LEAST_UPPER_BOUND?q:0>p?-1:p}A.GREATEST_LOWER_BOUND=1;A.LEAST_UPPER_BOUND=2;A.search=function(p,t,m,f){if(0===t.length)return-1;p=e(-1,t.length,p,t,m,f||A.GREATEST_LOWER_BOUND);if(0>p)return-1;for(;0<=p-1&&0===m(t[p],t[p-1],!0);)--p;return p}},{}],14:[function(C,J,A){function e(){this._array=[];this._sorted=!0;this._last={generatedLine:-1,generatedColumn:0}}var p=C("./util");e.prototype.unsortedForEach=function(t,m){this._array.forEach(t,m)};e.prototype.add=function(t){var m=this._last,f=m.generatedLine,
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+"mappings");d=f.getArg(d,"file",null);if(g!=this._version)throw Error("Unsupported version: "+g);z&&(z=f.normalize(z));n=n.map(String).map(f.normalize).map(function(L){return z&&f.isAbsolute(z)&&f.isAbsolute(L)?f.relative(z,L):L});this._names=l.fromArray(v.map(String),!0);this._sources=l.fromArray(n,!0);this.sourceRoot=z;this.sourcesContent=G;this._mappings=D;this._sourceMapURL=u;this.file=d}function t(){this.generatedColumn=this.generatedLine=0;this.name=this.originalColumn=this.originalLine=this.source=
+null}function m(k,u){var d=k;"string"===typeof k&&(d=f.parseSourceMapInput(k));var g=f.getArg(d,"version");d=f.getArg(d,"sections");if(g!=this._version)throw Error("Unsupported version: "+g);this._sources=new l;this._names=new l;var n={line:-1,column:0};this._sections=d.map(function(v){if(v.url)throw Error("Support for url field in sections not implemented.");var z=f.getArg(v,"offset"),G=f.getArg(z,"line"),D=f.getArg(z,"column");if(G<n.line||G===n.line&&D<n.column)throw Error("Section offsets must be ordered and non-overlapping.");
+n=z;return{generatedOffset:{generatedLine:G+1,generatedColumn:D+1},consumer:new e(f.getArg(v,"map"),u)}})}var f=C("./util"),c=C("./binary-search"),l=C("./array-set").ArraySet,q=C("./base64-vlq"),r=C("./quick-sort").quickSort;e.fromSourceMap=function(k){return p.fromSourceMap(k)};e.prototype._version=3;e.prototype.__generatedMappings=null;Object.defineProperty(e.prototype,"_generatedMappings",{configurable:!0,enumerable:!0,get:function(){this.__generatedMappings||this._parseMappings(this._mappings,
+this.sourceRoot);return this.__generatedMappings}});e.prototype.__originalMappings=null;Object.defineProperty(e.prototype,"_originalMappings",{configurable:!0,enumerable:!0,get:function(){this.__originalMappings||this._parseMappings(this._mappings,this.sourceRoot);return this.__originalMappings}});e.prototype._charIsMappingSeparator=function(k,u){var d=k.charAt(u);return";"===d||","===d};e.prototype._parseMappings=function(k,u){throw Error("Subclasses must implement _parseMappings");};e.GENERATED_ORDER=
+1;e.ORIGINAL_ORDER=2;e.GREATEST_LOWER_BOUND=1;e.LEAST_UPPER_BOUND=2;e.prototype.eachMapping=function(k,u,d){u=u||null;switch(d||e.GENERATED_ORDER){case e.GENERATED_ORDER:d=this._generatedMappings;break;case e.ORIGINAL_ORDER:d=this._originalMappings;break;default:throw Error("Unknown order of iteration.");}var g=this.sourceRoot;d.map(function(n){var v=null===n.source?null:this._sources.at(n.source);v=f.computeSourceURL(g,v,this._sourceMapURL);return{source:v,generatedLine:n.generatedLine,generatedColumn:n.generatedColumn,
+originalLine:n.originalLine,originalColumn:n.originalColumn,name:null===n.name?null:this._names.at(n.name)}},this).forEach(k,u)};e.prototype.allGeneratedPositionsFor=function(k){var u=f.getArg(k,"line"),d={source:f.getArg(k,"source"),originalLine:u,originalColumn:f.getArg(k,"column",0)};null!=this.sourceRoot&&(d.source=f.relative(this.sourceRoot,d.source));if(!this._sources.has(d.source))return[];d.source=this._sources.indexOf(d.source);var g=[];d=this._findMapping(d,this._originalMappings,"originalLine",
+"originalColumn",f.compareByOriginalPositions,c.LEAST_UPPER_BOUND);if(0<=d){var n=this._originalMappings[d];if(void 0===k.column)for(u=n.originalLine;n&&n.originalLine===u;)g.push({line:f.getArg(n,"generatedLine",null),column:f.getArg(n,"generatedColumn",null),lastColumn:f.getArg(n,"lastGeneratedColumn",null)}),n=this._originalMappings[++d];else for(k=n.originalColumn;n&&n.originalLine===u&&n.originalColumn==k;)g.push({line:f.getArg(n,"generatedLine",null),column:f.getArg(n,"generatedColumn",null),
+lastColumn:f.getArg(n,"lastGeneratedColumn",null)}),n=this._originalMappings[++d]}return g};A.SourceMapConsumer=e;p.prototype=Object.create(e.prototype);p.prototype.consumer=e;p.fromSourceMap=function(k,u){var d=Object.create(p.prototype),g=d._names=l.fromArray(k._names.toArray(),!0),n=d._sources=l.fromArray(k._sources.toArray(),!0);d.sourceRoot=k._sourceRoot;d.sourcesContent=k._generateSourcesContent(d._sources.toArray(),d.sourceRoot);d.file=k._file;d._sourceMapURL=u;for(var v=k._mappings.toArray().slice(),
+z=d.__generatedMappings=[],G=d.__originalMappings=[],D=0,L=v.length;D<L;D++){var a=v[D],b=new t;b.generatedLine=a.generatedLine;b.generatedColumn=a.generatedColumn;a.source&&(b.source=n.indexOf(a.source),b.originalLine=a.originalLine,b.originalColumn=a.originalColumn,a.name&&(b.name=g.indexOf(a.name)),G.push(b));z.push(b)}r(d.__originalMappings,f.compareByOriginalPositions);return d};p.prototype._version=3;Object.defineProperty(p.prototype,"sources",{get:function(){return this._sources.toArray().map(function(k){return f.computeSourceURL(this.sourceRoot,
+k,this._sourceMapURL)},this)}});p.prototype._parseMappings=function(k,u){for(var d=1,g=0,n=0,v=0,z=0,G=0,D=k.length,L=0,a={},b={},h=[],w=[],y,H,K,N,P;L<D;)if(";"===k.charAt(L))d++,L++,g=0;else if(","===k.charAt(L))L++;else{y=new t;y.generatedLine=d;for(N=L;N<D&&!this._charIsMappingSeparator(k,N);N++);H=k.slice(L,N);if(K=a[H])L+=H.length;else{for(K=[];L<N;)q.decode(k,L,b),P=b.value,L=b.rest,K.push(P);if(2===K.length)throw Error("Found a source, but no line and column");if(3===K.length)throw Error("Found a source and line, but no column");
+a[H]=K}y.generatedColumn=g+K[0];g=y.generatedColumn;1<K.length&&(y.source=z+K[1],z+=K[1],y.originalLine=n+K[2],n=y.originalLine,y.originalLine+=1,y.originalColumn=v+K[3],v=y.originalColumn,4<K.length&&(y.name=G+K[4],G+=K[4]));w.push(y);"number"===typeof y.originalLine&&h.push(y)}r(w,f.compareByGeneratedPositionsDeflated);this.__generatedMappings=w;r(h,f.compareByOriginalPositions);this.__originalMappings=h};p.prototype._findMapping=function(k,u,d,g,n,v){if(0>=k[d])throw new TypeError("Line must be greater than or equal to 1, got "+
+k[d]);if(0>k[g])throw new TypeError("Column must be greater than or equal to 0, got "+k[g]);return c.search(k,u,n,v)};p.prototype.computeColumnSpans=function(){for(var k=0;k<this._generatedMappings.length;++k){var u=this._generatedMappings[k];if(k+1<this._generatedMappings.length){var d=this._generatedMappings[k+1];if(u.generatedLine===d.generatedLine){u.lastGeneratedColumn=d.generatedColumn-1;continue}}u.lastGeneratedColumn=Infinity}};p.prototype.originalPositionFor=function(k){var u={generatedLine:f.getArg(k,
+"line"),generatedColumn:f.getArg(k,"column")};k=this._findMapping(u,this._generatedMappings,"generatedLine","generatedColumn",f.compareByGeneratedPositionsDeflated,f.getArg(k,"bias",e.GREATEST_LOWER_BOUND));if(0<=k&&(k=this._generatedMappings[k],k.generatedLine===u.generatedLine)){u=f.getArg(k,"source",null);null!==u&&(u=this._sources.at(u),u=f.computeSourceURL(this.sourceRoot,u,this._sourceMapURL));var d=f.getArg(k,"name",null);null!==d&&(d=this._names.at(d));return{source:u,line:f.getArg(k,"originalLine",
+null),column:f.getArg(k,"originalColumn",null),name:d}}return{source:null,line:null,column:null,name:null}};p.prototype.hasContentsOfAllSources=function(){return this.sourcesContent?this.sourcesContent.length>=this._sources.size()&&!this.sourcesContent.some(function(k){return null==k}):!1};p.prototype.sourceContentFor=function(k,u){if(!this.sourcesContent)return null;var d=k;null!=this.sourceRoot&&(d=f.relative(this.sourceRoot,d));if(this._sources.has(d))return this.sourcesContent[this._sources.indexOf(d)];
+var g=this.sources,n;for(n=0;n<g.length;++n)if(g[n]==k)return this.sourcesContent[n];var v;if(null!=this.sourceRoot&&(v=f.urlParse(this.sourceRoot))){g=d.replace(/^file:\/\//,"");if("file"==v.scheme&&this._sources.has(g))return this.sourcesContent[this._sources.indexOf(g)];if((!v.path||"/"==v.path)&&this._sources.has("/"+d))return this.sourcesContent[this._sources.indexOf("/"+d)]}if(u)return null;throw Error('"'+d+'" is not in the SourceMap.');};p.prototype.generatedPositionFor=function(k){var u=
+f.getArg(k,"source");null!=this.sourceRoot&&(u=f.relative(this.sourceRoot,u));if(!this._sources.has(u))return{line:null,column:null,lastColumn:null};u=this._sources.indexOf(u);u={source:u,originalLine:f.getArg(k,"line"),originalColumn:f.getArg(k,"column")};k=this._findMapping(u,this._originalMappings,"originalLine","originalColumn",f.compareByOriginalPositions,f.getArg(k,"bias",e.GREATEST_LOWER_BOUND));return 0<=k&&(k=this._originalMappings[k],k.source===u.source)?{line:f.getArg(k,"generatedLine",
+null),column:f.getArg(k,"generatedColumn",null),lastColumn:f.getArg(k,"lastGeneratedColumn",null)}:{line:null,column:null,lastColumn:null}};A.BasicSourceMapConsumer=p;m.prototype=Object.create(e.prototype);m.prototype.constructor=e;m.prototype._version=3;Object.defineProperty(m.prototype,"sources",{get:function(){for(var k=[],u=0;u<this._sections.length;u++)for(var d=0;d<this._sections[u].consumer.sources.length;d++)k.push(this._sections[u].consumer.sources[d]);return k}});m.prototype.originalPositionFor=
+function(k){var u={generatedLine:f.getArg(k,"line"),generatedColumn:f.getArg(k,"column")},d=c.search(u,this._sections,function(g,n){var v=g.generatedLine-n.generatedOffset.generatedLine;return v?v:g.generatedColumn-n.generatedOffset.generatedColumn});return(d=this._sections[d])?d.consumer.originalPositionFor({line:u.generatedLine-(d.generatedOffset.generatedLine-1),column:u.generatedColumn-(d.generatedOffset.generatedLine===u.generatedLine?d.generatedOffset.generatedColumn-1:0),bias:k.bias}):{source:null,
+line:null,column:null,name:null}};m.prototype.hasContentsOfAllSources=function(){return this._sections.every(function(k){return k.consumer.hasContentsOfAllSources()})};m.prototype.sourceContentFor=function(k,u){for(var d=0;d<this._sections.length;d++){var g=this._sections[d].consumer.sourceContentFor(k,!0);if(g)return g}if(u)return null;throw Error('"'+k+'" is not in the SourceMap.');};m.prototype.generatedPositionFor=function(k){for(var u=0;u<this._sections.length;u++){var d=this._sections[u];if(-1!==
+d.consumer.sources.indexOf(f.getArg(k,"source"))){var g=d.consumer.generatedPositionFor(k);if(g)return{line:g.line+(d.generatedOffset.generatedLine-1),column:g.column+(d.generatedOffset.generatedLine===g.line?d.generatedOffset.generatedColumn-1:0)}}}return{line:null,column:null}};m.prototype._parseMappings=function(k,u){this.__generatedMappings=[];this.__originalMappings=[];for(var d=0;d<this._sections.length;d++)for(var g=this._sections[d],n=g.consumer._generatedMappings,v=0;v<n.length;v++){var z=
+n[v],G=g.consumer._sources.at(z.source);G=f.computeSourceURL(g.consumer.sourceRoot,G,this._sourceMapURL);this._sources.add(G);G=this._sources.indexOf(G);var D=null;z.name&&(D=g.consumer._names.at(z.name),this._names.add(D),D=this._names.indexOf(D));z={source:G,generatedLine:z.generatedLine+(g.generatedOffset.generatedLine-1),generatedColumn:z.generatedColumn+(g.generatedOffset.generatedLine===z.generatedLine?g.generatedOffset.generatedColumn-1:0),originalLine:z.originalLine,originalColumn:z.originalColumn,
+name:D};this.__generatedMappings.push(z);"number"===typeof z.originalLine&&this.__originalMappings.push(z)}r(this.__generatedMappings,f.compareByGeneratedPositionsDeflated);r(this.__originalMappings,f.compareByOriginalPositions)};A.IndexedSourceMapConsumer=m},{"./array-set":10,"./base64-vlq":11,"./binary-search":13,"./quick-sort":15,"./util":19}],17:[function(C,J,A){function e(c){c||(c={});this._file=t.getArg(c,"file",null);this._sourceRoot=t.getArg(c,"sourceRoot",null);this._skipValidation=t.getArg(c,
+"skipValidation",!1);this._sources=new m;this._names=new m;this._mappings=new f;this._sourcesContents=null}var p=C("./base64-vlq"),t=C("./util"),m=C("./array-set").ArraySet,f=C("./mapping-list").MappingList;e.prototype._version=3;e.fromSourceMap=function(c){var l=c.sourceRoot,q=new e({file:c.file,sourceRoot:l});c.eachMapping(function(r){var k={generated:{line:r.generatedLine,column:r.generatedColumn}};null!=r.source&&(k.source=r.source,null!=l&&(k.source=t.relative(l,k.source)),k.original={line:r.originalLine,
+column:r.originalColumn},null!=r.name&&(k.name=r.name));q.addMapping(k)});c.sources.forEach(function(r){var k=r;null!==l&&(k=t.relative(l,r));q._sources.has(k)||q._sources.add(k);k=c.sourceContentFor(r);null!=k&&q.setSourceContent(r,k)});return q};e.prototype.addMapping=function(c){var l=t.getArg(c,"generated"),q=t.getArg(c,"original",null),r=t.getArg(c,"source",null);c=t.getArg(c,"name",null);this._skipValidation||this._validateMapping(l,q,r,c);null!=r&&(r=String(r),this._sources.has(r)||this._sources.add(r));
+null!=c&&(c=String(c),this._names.has(c)||this._names.add(c));this._mappings.add({generatedLine:l.line,generatedColumn:l.column,originalLine:null!=q&&q.line,originalColumn:null!=q&&q.column,source:r,name:c})};e.prototype.setSourceContent=function(c,l){var q=c;null!=this._sourceRoot&&(q=t.relative(this._sourceRoot,q));null!=l?(this._sourcesContents||(this._sourcesContents=Object.create(null)),this._sourcesContents[t.toSetString(q)]=l):this._sourcesContents&&(delete this._sourcesContents[t.toSetString(q)],
+0===Object.keys(this._sourcesContents).length&&(this._sourcesContents=null))};e.prototype.applySourceMap=function(c,l,q){var r=l;if(null==l){if(null==c.file)throw Error('SourceMapGenerator.prototype.applySourceMap requires either an explicit source file, or the source map\'s "file" property. Both were omitted.');r=c.file}var k=this._sourceRoot;null!=k&&(r=t.relative(k,r));var u=new m,d=new m;this._mappings.unsortedForEach(function(g){if(g.source===r&&null!=g.originalLine){var n=c.originalPositionFor({line:g.originalLine,
+column:g.originalColumn});null!=n.source&&(g.source=n.source,null!=q&&(g.source=t.join(q,g.source)),null!=k&&(g.source=t.relative(k,g.source)),g.originalLine=n.line,g.originalColumn=n.column,null!=n.name&&(g.name=n.name))}n=g.source;null==n||u.has(n)||u.add(n);g=g.name;null==g||d.has(g)||d.add(g)},this);this._sources=u;this._names=d;c.sources.forEach(function(g){var n=c.sourceContentFor(g);null!=n&&(null!=q&&(g=t.join(q,g)),null!=k&&(g=t.relative(k,g)),this.setSourceContent(g,n))},this)};e.prototype._validateMapping=
+function(c,l,q,r){if(l&&"number"!==typeof l.line&&"number"!==typeof l.column)throw Error("original.line and original.column are not numbers -- you probably meant to omit the original mapping entirely and only map the generated position. If so, pass null for the original mapping instead of an object with empty or null values.");if(!(c&&"line"in c&&"column"in c&&0<c.line&&0<=c.column&&!l&&!q&&!r||c&&"line"in c&&"column"in c&&l&&"line"in l&&"column"in l&&0<c.line&&0<=c.column&&0<l.line&&0<=l.column&&
+q))throw Error("Invalid mapping: "+JSON.stringify({generated:c,source:q,original:l,name:r}));};e.prototype._serializeMappings=function(){for(var c=0,l=1,q=0,r=0,k=0,u=0,d="",g,n,v,z=this._mappings.toArray(),G=0,D=z.length;G<D;G++){n=z[G];g="";if(n.generatedLine!==l)for(c=0;n.generatedLine!==l;)g+=";",l++;else if(0<G){if(!t.compareByGeneratedPositionsInflated(n,z[G-1]))continue;g+=","}g+=p.encode(n.generatedColumn-c);c=n.generatedColumn;null!=n.source&&(v=this._sources.indexOf(n.source),g+=p.encode(v-
+u),u=v,g+=p.encode(n.originalLine-1-r),r=n.originalLine-1,g+=p.encode(n.originalColumn-q),q=n.originalColumn,null!=n.name&&(n=this._names.indexOf(n.name),g+=p.encode(n-k),k=n));d+=g}return d};e.prototype._generateSourcesContent=function(c,l){return c.map(function(q){if(!this._sourcesContents)return null;null!=l&&(q=t.relative(l,q));q=t.toSetString(q);return Object.prototype.hasOwnProperty.call(this._sourcesContents,q)?this._sourcesContents[q]:null},this)};e.prototype.toJSON=function(){var c={version:this._version,
+sources:this._sources.toArray(),names:this._names.toArray(),mappings:this._serializeMappings()};null!=this._file&&(c.file=this._file);null!=this._sourceRoot&&(c.sourceRoot=this._sourceRoot);this._sourcesContents&&(c.sourcesContent=this._generateSourcesContent(c.sources,c.sourceRoot));return c};e.prototype.toString=function(){return JSON.stringify(this.toJSON())};A.SourceMapGenerator=e},{"./array-set":10,"./base64-vlq":11,"./mapping-list":14,"./util":19}],18:[function(C,J,A){function e(f,c,l,q,r){this.children=
+[];this.sourceContents={};this.line=null==f?null:f;this.column=null==c?null:c;this.source=null==l?null:l;this.name=null==r?null:r;this.$$$isSourceNode$$$=!0;null!=q&&this.add(q)}var p=C("./source-map-generator").SourceMapGenerator,t=C("./util"),m=/(\r?\n)/;e.fromStringWithSourceMap=function(f,c,l){function q(z,G){if(null===z||void 0===z.source)r.add(G);else{var D=l?t.join(l,z.source):z.source;r.add(new e(z.originalLine,z.originalColumn,D,G,z.name))}}var r=new e,k=f.split(m),u=0,d=function(){var z=
+u<k.length?k[u++]:void 0,G=(u<k.length?k[u++]:void 0)||"";return z+G},g=1,n=0,v=null;c.eachMapping(function(z){if(null!==v)if(g<z.generatedLine)q(v,d()),g++,n=0;else{var G=k[u]||"",D=G.substr(0,z.generatedColumn-n);k[u]=G.substr(z.generatedColumn-n);n=z.generatedColumn;q(v,D);v=z;return}for(;g<z.generatedLine;)r.add(d()),g++;n<z.generatedColumn&&(G=k[u]||"",r.add(G.substr(0,z.generatedColumn)),k[u]=G.substr(z.generatedColumn),n=z.generatedColumn);v=z},this);u<k.length&&(v&&q(v,d()),r.add(k.splice(u).join("")));
+c.sources.forEach(function(z){var G=c.sourceContentFor(z);null!=G&&(null!=l&&(z=t.join(l,z)),r.setSourceContent(z,G))});return r};e.prototype.add=function(f){if(Array.isArray(f))f.forEach(function(c){this.add(c)},this);else if(f.$$$isSourceNode$$$||"string"===typeof f)f&&this.children.push(f);else throw new TypeError("Expected a SourceNode, string, or an array of SourceNodes and strings. Got "+f);return this};e.prototype.prepend=function(f){if(Array.isArray(f))for(var c=f.length-1;0<=c;c--)this.prepend(f[c]);
+else if(f.$$$isSourceNode$$$||"string"===typeof f)this.children.unshift(f);else throw new TypeError("Expected a SourceNode, string, or an array of SourceNodes and strings. Got "+f);return this};e.prototype.walk=function(f){for(var c,l=0,q=this.children.length;l<q;l++)c=this.children[l],c.$$$isSourceNode$$$?c.walk(f):""!==c&&f(c,{source:this.source,line:this.line,column:this.column,name:this.name})};e.prototype.join=function(f){var c,l=this.children.length;if(0<l){var q=[];for(c=0;c<l-1;c++)q.push(this.children[c]),
+q.push(f);q.push(this.children[c]);this.children=q}return this};e.prototype.replaceRight=function(f,c){var l=this.children[this.children.length-1];l.$$$isSourceNode$$$?l.replaceRight(f,c):"string"===typeof l?this.children[this.children.length-1]=l.replace(f,c):this.children.push("".replace(f,c));return this};e.prototype.setSourceContent=function(f,c){this.sourceContents[t.toSetString(f)]=c};e.prototype.walkSourceContents=function(f){for(var c=0,l=this.children.length;c<l;c++)this.children[c].$$$isSourceNode$$$&&
+this.children[c].walkSourceContents(f);var q=Object.keys(this.sourceContents);c=0;for(l=q.length;c<l;c++)f(t.fromSetString(q[c]),this.sourceContents[q[c]])};e.prototype.toString=function(){var f="";this.walk(function(c){f+=c});return f};e.prototype.toStringWithSourceMap=function(f){var c="",l=1,q=0,r=new p(f),k=!1,u=null,d=null,g=null,n=null;this.walk(function(v,z){c+=v;null!==z.source&&null!==z.line&&null!==z.column?(u===z.source&&d===z.line&&g===z.column&&n===z.name||r.addMapping({source:z.source,
+original:{line:z.line,column:z.column},generated:{line:l,column:q},name:z.name}),u=z.source,d=z.line,g=z.column,n=z.name,k=!0):k&&(r.addMapping({generated:{line:l,column:q}}),u=null,k=!1);for(var G=0,D=v.length;G<D;G++)10===v.charCodeAt(G)?(l++,q=0,G+1===D?(u=null,k=!1):k&&r.addMapping({source:z.source,original:{line:z.line,column:z.column},generated:{line:l,column:q},name:z.name})):q++});this.walkSourceContents(function(v,z){r.setSourceContent(v,z)});return{code:c,map:r}};A.SourceNode=e},{"./source-map-generator":17,
+"./util":19}],19:[function(C,J,A){function e(d){return(d=d.match(k))?{scheme:d[1],auth:d[2],host:d[3],port:d[4],path:d[5]}:null}function p(d){var g="";d.scheme&&(g+=d.scheme+":");g+="//";d.auth&&(g+=d.auth+"@");d.host&&(g+=d.host);d.port&&(g+=":"+d.port);d.path&&(g+=d.path);return g}function t(d){var g=d,n=e(d);if(n){if(!n.path)return d;g=n.path}d=A.isAbsolute(g);g=g.split(/\/+/);for(var v,z=0,G=g.length-1;0<=G;G--)v=g[G],"."===v?g.splice(G,1):".."===v?z++:0<z&&(""===v?(g.splice(G+1,z),z=0):(g.splice(G,
+2),z--));g=g.join("/");""===g&&(g=d?"/":".");return n?(n.path=g,p(n)):g}function m(d,g){""===d&&(d=".");""===g&&(g=".");var n=e(g),v=e(d);v&&(d=v.path||"/");if(n&&!n.scheme)return v&&(n.scheme=v.scheme),p(n);if(n||g.match(u))return g;if(v&&!v.host&&!v.path)return v.host=g,p(v);n="/"===g.charAt(0)?g:t(d.replace(/\/+$/,"")+"/"+g);return v?(v.path=n,p(v)):n}function f(d){return d}function c(d){return q(d)?"$"+d:d}function l(d){return q(d)?d.slice(1):d}function q(d){if(!d)return!1;var g=d.length;if(9>
+g||95!==d.charCodeAt(g-1)||95!==d.charCodeAt(g-2)||111!==d.charCodeAt(g-3)||116!==d.charCodeAt(g-4)||111!==d.charCodeAt(g-5)||114!==d.charCodeAt(g-6)||112!==d.charCodeAt(g-7)||95!==d.charCodeAt(g-8)||95!==d.charCodeAt(g-9))return!1;for(g-=10;0<=g;g--)if(36!==d.charCodeAt(g))return!1;return!0}function r(d,g){return d===g?0:null===d?1:null===g?-1:d>g?1:-1}A.getArg=function(d,g,n){if(g in d)return d[g];if(3===arguments.length)return n;throw Error('"'+g+'" is a required argument.');};var k=/^(?:([\w+\-.]+):)?\/\/(?:(\w+:\w+)@)?([\w.-]*)(?::(\d+))?(.*)$/,
+u=/^data:.+,.+$/;A.urlParse=e;A.urlGenerate=p;A.normalize=t;A.join=m;A.isAbsolute=function(d){return"/"===d.charAt(0)||k.test(d)};A.relative=function(d,g){""===d&&(d=".");d=d.replace(/\/$/,"");for(var n=0;0!==g.indexOf(d+"/");){var v=d.lastIndexOf("/");if(0>v)return g;d=d.slice(0,v);if(d.match(/^([^\/]+:\/)?\/*$/))return g;++n}return Array(n+1).join("../")+g.substr(d.length+1)};C=!("__proto__"in Object.create(null));A.toSetString=C?f:c;A.fromSetString=C?f:l;A.compareByOriginalPositions=function(d,
+g,n){var v=r(d.source,g.source);if(0!==v)return v;v=d.originalLine-g.originalLine;if(0!==v)return v;v=d.originalColumn-g.originalColumn;if(0!==v||n)return v;v=d.generatedColumn-g.generatedColumn;if(0!==v)return v;v=d.generatedLine-g.generatedLine;return 0!==v?v:r(d.name,g.name)};A.compareByGeneratedPositionsDeflated=function(d,g,n){var v=d.generatedLine-g.generatedLine;if(0!==v)return v;v=d.generatedColumn-g.generatedColumn;if(0!==v||n)return v;v=r(d.source,g.source);if(0!==v)return v;v=d.originalLine-
+g.originalLine;if(0!==v)return v;v=d.originalColumn-g.originalColumn;return 0!==v?v:r(d.name,g.name)};A.compareByGeneratedPositionsInflated=function(d,g){var n=d.generatedLine-g.generatedLine;if(0!==n)return n;n=d.generatedColumn-g.generatedColumn;if(0!==n)return n;n=r(d.source,g.source);if(0!==n)return n;n=d.originalLine-g.originalLine;if(0!==n)return n;n=d.originalColumn-g.originalColumn;return 0!==n?n:r(d.name,g.name)};A.parseSourceMapInput=function(d){return JSON.parse(d.replace(/^\)]}'[^\n]*\n/,
+""))};A.computeSourceURL=function(d,g,n){g=g||"";d&&("/"!==d[d.length-1]&&"/"!==g[0]&&(d+="/"),g=d+g);if(n){d=e(n);if(!d)throw Error("sourceMapURL could not be parsed");d.path&&(n=d.path.lastIndexOf("/"),0<=n&&(d.path=d.path.substring(0,n+1)));g=m(p(d),g)}return t(g)}},{}],20:[function(C,J,A){A.SourceMapGenerator=C("./lib/source-map-generator").SourceMapGenerator;A.SourceMapConsumer=C("./lib/source-map-consumer").SourceMapConsumer;A.SourceNode=C("./lib/source-node").SourceNode},{"./lib/source-map-consumer":16,
+"./lib/source-map-generator":17,"./lib/source-node":18}],21:[function(C,J,A){(function(e){function p(){return"browser"===a?!0:"node"===a?!1:"undefined"!==typeof window&&"function"===typeof XMLHttpRequest&&!(window.require&&window.module&&window.process&&"renderer"===window.process.type)}function t(x){return function(B){for(var F=0;F<x.length;F++){var E=x[F](B);if(E)return E}return null}}function m(x,B){if(!x)return B;var F=n.dirname(x),E=/^\w+:\/\/[^\/]*/.exec(F);E=E?E[0]:"";var I=F.slice(E.length);
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+/^(?:is|get)/.test(F)?function(){return x[F].call(x)}:x[F]});B.toString=l;return B}function r(x,B){void 0===B&&(B={nextPosition:null,curPosition:null});if(x.isNative())return B.curPosition=null,x;var F=x.getFileName()||x.getScriptNameOrSourceURL();if(F){var E=x.getLineNumber(),I=x.getColumnNumber()-1,M=/^v(10\.1[6-9]|10\.[2-9][0-9]|10\.[0-9]{3,}|1[2-9]\d*|[2-9]\d|\d{3,}|11\.11)/.test("object"===typeof e?e.version:"")?0:62;1===E&&I>M&&!p()&&!x.isEval()&&(I-=M);var O=f({source:F,line:E,column:I});B.curPosition=
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+curPosition:null},I=[],M=B.length-1;0<=M;M--)I.push("\n    at "+r(B[M],E)),E.nextPosition=E.curPosition;E.curPosition=E.nextPosition=null;return F+I.reverse().join("")}function u(x){var B=/\n    at [^(]+ \((.*):(\d+):(\d+)\)/.exec(x.stack);if(B){x=B[1];var F=+B[2];B=+B[3];var E=b[x];if(!E&&v&&v.existsSync(x))try{E=v.readFileSync(x,"utf8")}catch(I){E=""}if(E&&(E=E.split(/(?:\r\n|\r|\n)/)[F-1]))return x+":"+F+"\n"+E+"\n"+Array(B).join(" ")+"^"}return null}function d(){var x=e.emit;e.emit=function(B){if("uncaughtException"===
+B){var F=arguments[1]&&arguments[1].stack,E=0<this.listeners(B).length;if(F&&!E){F=arguments[1];E=u(F);e.stderr._handle&&e.stderr._handle.setBlocking&&e.stderr._handle.setBlocking(!0);E&&(console.error(),console.error(E));console.error(F.stack);e.exit(1);return}}return x.apply(this,arguments)}}var g=C("source-map").SourceMapConsumer,n=C("path");try{var v=C("fs");v.existsSync&&v.readFileSync||(v=null)}catch(x){}var z=C("buffer-from"),G=!1,D=!1,L=!1,a="auto",b={},h={},w=/^data:application\/json[^,]+base64,/,
+y=[],H=[],K=t(y);y.push(function(x){x=x.trim();/^file:/.test(x)&&(x=x.replace(/file:\/\/\/(\w:)?/,function(E,I){return I?"":"/"}));if(x in b)return b[x];var B="";try{if(v)v.existsSync(x)&&(B=v.readFileSync(x,"utf8"));else{var F=new XMLHttpRequest;F.open("GET",x,!1);F.send(null);4===F.readyState&&200===F.status&&(B=F.responseText)}}catch(E){}return b[x]=B});var N=t(H);H.push(function(x){a:{if(p())try{var B=new XMLHttpRequest;B.open("GET",x,!1);B.send(null);var F=B.getResponseHeader("SourceMap")||B.getResponseHeader("X-SourceMap");
+if(F){var E=F;break a}}catch(M){}E=K(x);B=/(?:\/\/[@#][\s]*sourceMappingURL=([^\s'"]+)[\s]*$)|(?:\/\*[@#][\s]*sourceMappingURL=([^\s*'"]+)[\s]*(?:\*\/)[\s]*$)/mg;for(var I;F=B.exec(E);)I=F;E=I?I[1]:null}if(!E)return null;w.test(E)?(I=E.slice(E.indexOf(",")+1),I=z(I,"base64").toString(),E=x):(E=m(x,E),I=K(E));return I?{url:E,map:I}:null});var P=y.slice(0),U=H.slice(0);A.wrapCallSite=r;A.getErrorSource=u;A.mapSourcePosition=f;A.retrieveSourceMap=N;A.install=function(x){x=x||{};if(x.environment&&(a=
+x.environment,-1===["node","browser","auto"].indexOf(a)))throw Error("environment "+a+" was unknown. Available options are {auto, browser, node}");x.retrieveFile&&(x.overrideRetrieveFile&&(y.length=0),y.unshift(x.retrieveFile));x.retrieveSourceMap&&(x.overrideRetrieveSourceMap&&(H.length=0),H.unshift(x.retrieveSourceMap));if(x.hookRequire&&!p()){var B=J.require("module"),F=B.prototype._compile;F.__sourceMapSupport||(B.prototype._compile=function(E,I){b[I]=E;h[I]=void 0;return F.call(this,E,I)},B.prototype._compile.__sourceMapSupport=
+!0)}L||(L="emptyCacheBetweenOperations"in x?x.emptyCacheBetweenOperations:!1);G||(G=!0,Error.prepareStackTrace=k);if(!D){x="handleUncaughtExceptions"in x?x.handleUncaughtExceptions:!0;try{!1===J.require("worker_threads").isMainThread&&(x=!1)}catch(E){}x&&"object"===typeof e&&null!==e&&"function"===typeof e.on&&(D=!0,d())}};A.resetRetrieveHandlers=function(){y.length=0;H.length=0;y=P.slice(0);H=U.slice(0);N=t(H);K=t(y)}}).call(this,C("g5I+bs"))},{"buffer-from":4,fs:3,"g5I+bs":9,path:8,"source-map":20}]},
+{},[1]);return R});
diff --git a/source-map-support.js b/source-map-support.js
index 4459386..2942b5e 100644
--- a/source-map-support.js
+++ b/source-map-support.js
@@ -59,6 +59,26 @@ function hasGlobalProcessEventEmitter() {
   return ((typeof process === 'object') && (process !== null) && (typeof process.on === 'function'));
 }
 
+function globalProcessVersion() {
+  if ((typeof process === 'object') && (process !== null)) {
+    return process.version;
+  } else {
+    return '';
+  }
+}
+
+function globalProcessStderr() {
+  if ((typeof process === 'object') && (process !== null)) {
+    return process.stderr;
+  }
+}
+
+function globalProcessExit(code) {
+  if ((typeof process === 'object') && (process !== null) && (typeof process.exit === 'function')) {
+    return process.exit(code);
+  }
+}
+
 function handlerExec(list) {
   return function(arg) {
     for (var i = 0; i < list.length; i++) {
@@ -369,7 +389,7 @@ function wrapCallSite(frame, state) {
     // v11 is not an LTS candidate, we can just test the one version with it.
     // Test node versions for: 10.16-19, 10.20+, 12-19, 20-99, 100+, or 11.11
     var noHeader = /^v(10\.1[6-9]|10\.[2-9][0-9]|10\.[0-9]{3,}|1[2-9]\d*|[2-9]\d|\d{3,}|11\.11)/;
-    var headerLength = noHeader.test(process.version) ? 0 : 62;
+    var headerLength = noHeader.test(globalProcessVersion()) ? 0 : 62;
     if (line === 1 && column > headerLength && !isInBrowser() && !frame.isEval()) {
       column -= headerLength;
     }
@@ -466,8 +486,9 @@ function printErrorAndExit (error) {
   var source = getErrorSource(error);
 
   // Ensure error is printed synchronously and not truncated
-  if (process.stderr._handle && process.stderr._handle.setBlocking) {
-    process.stderr._handle.setBlocking(true);
+  var stderr = globalProcessStderr();
+  if (stderr && stderr._handle && stderr._handle.setBlocking) {
+    stderr._handle.setBlocking(true);
   }
 
   if (source) {
@@ -476,7 +497,7 @@ function printErrorAndExit (error) {
   }
 
   console.error(error.stack);
-  process.exit(1);
+  globalProcessExit(1);
 }
 
 function shimEmitUncaughtException () {
diff --git a/test.js b/test.js
index 02f1845..ff7bd48 100644
--- a/test.js
+++ b/test.js
@@ -144,6 +144,30 @@ it('normal throw', function() {
   ]);
 });
 
+it('does not crash on missing process object', function() {
+  var proc = process;
+  compareStackTrace(createMultiLineSourceMap(), [
+    'global.process = null;',
+    'throw new Error("test");'
+  ], [
+    'Error: test',
+    /^    at Object\.exports\.test \((?:.*[/\\])?line2\.js:1002:102\)$/
+  ]);
+  global.process = proc;
+});
+
+it('does not crash on missing process.stderr', function() {
+  var stderr = process.stderr;
+  compareStackTrace(createMultiLineSourceMap(), [
+    'process.stderr = null;',
+    'throw new Error("test");'
+  ], [
+    'Error: test',
+    /^    at Object\.exports\.test \((?:.*[/\\])?line2\.js:1002:102\)$/
+  ]);
+  process.stderr = stderr;
+});
+
 /* The following test duplicates some of the code in
  * `normal throw` but triggers file read failure.
  */