esm/esm/loader.js

Tomorrow's ECMAScript modules today!

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this.reservedWords.test(e)}extend(e,t){this[e]=t(this[e])}loadPlugins(e){for(var t in e){var r=M[t];if(!r)throw Error("Plugin '"+t+"' not found");r(this,e[t])}}parse(){var e=this.options.program||this.startNode();return this.nextToken(),this.parseTopLevel(e)}}var U=V.prototype,W=/^(?:'((?:\\.|[^'])*?)'|"((?:\\.|[^"])*?)"|;)/;function G(){this.shorthandAssign=this.trailingComma=this.parenthesizedAssign=this.parenthesizedBind=this.doubleProto=-1}U.strictDirective=function(e){for(;;){R.lastIndex=e,e+=R.exec(this.input)[0].length;var t=W.exec(this.input.slice(e));if(!t)return!1;if("use strict"==(t[1]||t[2]))return!0;e+=t[0].length}},U.eat=function(e){return this.type===e&&(this.next(),!0)},U.isContextual=function(e){return this.type===l.name&&this.value===e&&!this.containsEsc},U.eatContextual=function(e){return!!this.isContextual(e)&&(this.next(),!0)},U.expectContextual=function(e){this.eatContextual(e)||this.unexpected()},U.canInsertSemicolon=function(){return this.type===l.eof||this.type===l.braceR||E.test(this.input.slice(this.lastTokEnd,this.start))},U.insertSemicolon=function(){if(this.canInsertSemicolon())return this.options.onInsertedSemicolon&&this.options.onInsertedSemicolon(this.lastTokEnd,this.lastTokEndLoc),!0},U.semicolon=function(){this.eat(l.semi)||this.insertSemicolon()||this.unexpected()},U.afterTrailingComma=function(e,t){if(this.type==e)return this.options.onTrailingComma&&this.options.onTrailingComma(this.lastTokStart,this.lastTokStartLoc),t||this.next(),!0},U.expect=function(e){this.eat(e)||this.unexpected()},U.unexpected=function(e){this.raise(null!=e?e:this.start,"Unexpected token")},U.checkPatternErrors=function(e,t){if(e){e.trailingComma>-1&&this.raiseRecoverable(e.trailingComma,"Comma is not permitted after the rest element");var r=t?e.parenthesizedAssign:e.parenthesizedBind;r>-1&&this.raiseRecoverable(r,"Parenthesized pattern")}},U.checkExpressionErrors=function(e,t){if(!e)return!1;var r=e.shorthandAssign,n=e.doubleProto;if(!t)return r>=0||n>=0;r>=0&&this.raise(r,"Shorthand property assignments are valid only in destructuring patterns"),n>=0&&this.raiseRecoverable(n,"Redefinition of __proto__ property")},U.checkYieldAwaitInDefaultParams=function(){this.yieldPos&&(!this.awaitPos||this.yieldPos<this.awaitPos)&&this.raise(this.yieldPos,"Yield expression cannot be a default value"),this.awaitPos&&this.raise(this.awaitPos,"Await expression cannot be a default value")},U.isSimpleAssignTarget=function(e){return"ParenthesizedExpression"===e.type?this.isSimpleAssignTarget(e.expression):"Identifier"===e.type||"MemberExpression"===e.type};var B=V.prototype;B.checkPropClash=function(e,t,r){if(!(this.options.ecmaVersion>=9&&"SpreadElement"===e.type||this.options.ecmaVersion>=6&&(e.computed||e.method||e.shorthand))){var n,a=e.key;switch(a.type){case"Identifier":n=a.name;break;case"Literal":n=a.value+"";break;default:return}var i=e.kind;if(this.options.ecmaVersion>=6)"__proto__"===n&&"init"===i&&(t.proto&&(r&&r.doubleProto<0?r.doubleProto=a.start:this.raiseRecoverable(a.start,"Redefinition of __proto__ property")),t.proto=!0);else{n="$"+n;var s,o=t[n];o?(s="init"===i?this.strict&&o.init||o.get||o.set:o.init||o[i],s&&this.raiseRecoverable(a.start,"Redefinition of property")):o=t[n]={init:!1,get:!1,set:!1},o[i]=!0}}},B.parseExpression=function(e,t){var r=this.start,n=this.startLoc,a=this.parseMaybeAssign(e,t);if(this.type===l.comma){var i=this.startNodeAt(r,n);for(i.expressions=[a];this.eat(l.comma);)i.expressions.push(this.parseMaybeAssign(e,t));return this.finishNode(i,"SequenceExpression")}return a},B.parseMaybeAssign=function(e,t,r){if(this.inGenerator&&this.isContextual("yield"))return this.parseYield();var n=!1,a=-1,i=-1;t?(a=t.parenthesizedAssign,i=t.trailingComma,t.parenthesizedAssign=t.trailingComma=-1):(t=new G,n=!0);var s=this.start,o=this.startLoc;this.type!=l.parenL&&this.type!=l.name||(this.potentialArrowAt=this.start);var c=this.parseMaybeConditional(e,t);if(r&&(c=r.call(this,c,s,o)),this.type.isAssign){var u=this.startNodeAt(s,o);return u.operator=this.value,u.left=this.type===l.eq?this.toAssignable(c,!1,t):c,n||G.call(t),t.shorthandAssign=-1,this.checkLVal(c),this.next(),u.right=this.parseMaybeAssign(e),this.finishNode(u,"AssignmentExpression")}return n&&this.checkExpressionErrors(t,!0),a>-1&&(t.parenthesizedAssign=a),i>-1&&(t.trailingComma=i),c},B.parseMaybeConditional=function(e,t){var r=this.start,n=this.startLoc,a=this.parseExprOps(e,t);if(this.checkExpressionErrors(t))return a;if(this.eat(l.question)){var i=this.startNodeAt(r,n);return i.test=a,i.consequent=this.parseMaybeAssign(),this.expect(l.colon),i.alternate=this.parseMaybeAssign(e),this.finishNode(i,"ConditionalExpression")}return a},B.parseExprOps=function(e,t){var r=this.start,n=this.startLoc,a=this.parseMaybeUnary(t,!1);return this.checkExpressionErrors(t)?a:a.start==r&&"ArrowFunctionExpression"===a.type?a:this.parseExprOp(a,r,n,-1,e)},B.parseExprOp=function(e,t,r,n,a){var i=this.type.binop;if(null!=i&&(!a||this.type!==l._in)&&i>n){var s=this.type===l.logicalOR||this.type===l.logicalAND,o=this.value;this.next();var c=this.start,u=this.startLoc,p=this.parseExprOp(this.parseMaybeUnary(null,!1),c,u,i,a),h=this.buildBinary(t,r,e,p,o,s);return this.parseExprOp(h,t,r,n,a)}return e},B.buildBinary=function(e,t,r,n,a,i){var s=this.startNodeAt(e,t);return s.left=r,s.operator=a,s.right=n,this.finishNode(s,i?"LogicalExpression":"BinaryExpression")},B.parseMaybeUnary=function(e,t){var r,n=this.start,a=this.startLoc;if(this.inAsync&&this.isContextual("await"))r=this.parseAwait(),t=!0;else if(this.type.prefix){var i=this.startNode(),s=this.type===l.incDec;i.operator=this.value,i.prefix=!0,this.next(),i.argument=this.parseMaybeUnary(null,!0),this.checkExpressionErrors(e,!0),s?this.checkLVal(i.argument):this.strict&&"delete"===i.operator&&"Identifier"===i.argument.type?this.raiseRecoverable(i.start,"Deleting local variable in strict mode"):t=!0,r=this.finishNode(i,s?"UpdateExpression":"UnaryExpression")}else{if(r=this.parseExprSubscripts(e),this.checkExpressionErrors(e))return r;for(;this.type.postfix&&!this.canInsertSemicolon();){var o=this.startNodeAt(n,a);o.operator=this.value,o.prefix=!1,o.argument=r,this.checkLVal(r),this.next(),r=this.finishNode(o,"UpdateExpression")}}return!t&&this.eat(l.starstar)?this.buildBinary(n,a,r,this.parseMaybeUnary(null,!1),"**",!1):r},B.parseExprSubscripts=function(e){var t=this.start,r=this.startLoc,n=this.parseExprAtom(e),a="ArrowFunctionExpression"===n.type&&")"!==this.input.slice(this.lastTokStart,this.lastTokEnd);if(this.checkExpressionErrors(e)||a)return n;var i=this.parseSubscripts(n,t,r);return e&&"MemberExpression"===i.type&&(e.parenthesizedAssign>=i.start&&(e.parenthesizedAssign=-1),e.parenthesizedBind>=i.start&&(e.parenthesizedBind=-1)),i},B.parseSubscripts=function(e,t,r,n){for(var a,i=this.options.ecmaVersion>=8&&"Identifier"===e.type&&"async"===e.name&&this.lastTokEnd==e.end&&!this.canInsertSemicolon()&&"async"===this.input.slice(e.start,e.end);;)if((a=this.eat(l.bracketL))||this.eat(l.dot)){var s=this.startNodeAt(t,r);s.object=e,s.property=a?this.parseExpression():this.parseIdent(!0),s.computed=!!a,a&&this.expect(l.bracketR),e=this.finishNode(s,"MemberExpression")}else if(!n&&this.eat(l.parenL)){var o=new G,c=this.yieldPos,u=this.awaitPos;this.yieldPos=0,this.awaitPos=0;var p=this.parseExprList(l.parenR,this.options.ecmaVersion>=8,!1,o);if(i&&!this.canInsertSemicolon()&&this.eat(l.arrow))return this.checkPatternErrors(o,!1),this.checkYieldAwaitInDefaultParams(),this.yieldPos=c,this.awaitPos=u,this.parseArrowExpression(this.startNodeAt(t,r),p,!0);this.checkExpressionErrors(o,!0),this.yieldPos=c||this.yieldPos,this.awaitPos=u||this.awaitPos;var h=this.startNodeAt(t,r);h.callee=e,h.arguments=p,e=this.finishNode(h,"CallExpression")}else{if(this.type!==l.backQuote)return e;var f=this.startNodeAt(t,r);f.tag=e,f.quasi=this.parseTemplate({isTagged:!0}),e=this.finishNode(f,"TaggedTemplateExpression")}},B.parseExprAtom=function(e){var t,r=this.potentialArrowAt==this.start;switch(this.type){case l._super:return this.inFunction||this.raise(this.start,"'super' outside of function or class"),t=this.startNode(),this.next(),this.type!==l.dot&&this.type!==l.bracketL&&this.type!==l.parenL&&this.unexpected(),this.finishNode(t,"Super");case l._this:return t=this.startNode(),this.next(),this.finishNode(t,"ThisExpression");case l.name:var n=this.start,a=this.startLoc,i=this.containsEsc,s=this.parseIdent(this.type!==l.name);if(this.options.ecmaVersion>=8&&!i&&"async"===s.name&&!this.canInsertSemicolon()&&this.eat(l._function))return this.parseFunction(this.startNodeAt(n,a),!1,!1,!0);if(r&&!this.canInsertSemicolon()){if(this.eat(l.arrow))return this.parseArrowExpression(this.startNodeAt(n,a),[s],!1);if(this.options.ecmaVersion>=8&&"async"===s.name&&this.type===l.name&&!i)return s=this.parseIdent(),!this.canInsertSemicolon()&&this.eat(l.arrow)||this.unexpected(),this.parseArrowExpression(this.startNodeAt(n,a),[s],!0)}return s;case l.regexp:var o=this.value;return t=this.parseLiteral(o.value),t.regex={pattern:o.pattern,flags:o.flags},t;case l.num:case l.string:return this.parseLiteral(this.value);case l._null:case l._true:case l._false:return t=this.startNode(),t.value=this.type===l._null?null:this.type===l._true,t.raw=this.type.keyword,this.next(),this.finishNode(t,"Literal");case l.parenL:var c=this.start,u=this.parseParenAndDistinguishExpression(r);return e&&(e.parenthesizedAssign<0&&!this.isSimpleAssignTarget(u)&&(e.parenthesizedAssign=c),e.parenthesizedBind<0&&(e.parenthesizedBind=c)),u;case l.bracketL:return t=this.startNode(),this.next(),t.elements=this.parseExprList(l.bracketR,!0,!0,e),this.finishNode(t,"ArrayExpression");case l.braceL:return this.parseObj(!1,e);case l._function:return t=this.startNode(),this.next(),this.parseFunction(t,!1);case l._class:return this.parseClass(this.startNode(),!1);case l._new:return this.parseNew();case l.backQuote:return this.parseTemplate();default:this.unexpected()}},B.parseLiteral=function(e){var t=this.startNode();return t.value=e,t.raw=this.input.slice(this.start,this.end),this.next(),this.finishNode(t,"Literal")},B.parseParenExpression=function(){this.expect(l.parenL);var e=this.parseExpression();return this.expect(l.parenR),e},B.parseParenAndDistinguishExpression=function(e){var t,r=this.start,n=this.startLoc,a=this.options.ecmaVersion>=8;if(this.options.ecmaVersion>=6){this.next();var i,s=this.start,o=this.startLoc,c=[],u=!0,p=!1,h=new G,f=this.yieldPos,d=this.awaitPos;for(this.yieldPos=0,this.awaitPos=0;this.type!==l.parenR;){if(u?u=!1:this.expect(l.comma),a&&this.afterTrailingComma(l.parenR,!0)){p=!0;break}if(this.type===l.ellipsis){i=this.start,c.push(this.parseParenItem(this.parseRestBinding())),this.type===l.comma&&this.raise(this.start,"Comma is not permitted after the rest element");break}c.push(this.parseMaybeAssign(!1,h,this.parseParenItem))}var m=this.start,v=this.startLoc;if(this.expect(l.parenR),e&&!this.canInsertSemicolon()&&this.eat(l.arrow))return this.checkPatternErrors(h,!1),this.checkYieldAwaitInDefaultParams(),this.yieldPos=f,this.awaitPos=d,this.parseParenArrowList(r,n,c);c.length&&!p||this.unexpected(this.lastTokStart),i&&this.unexpected(i),this.checkExpressionErrors(h,!0),this.yieldPos=f||this.yieldPos,this.awaitPos=d||this.awaitPos,c.length>1?(t=this.startNodeAt(s,o),t.expressions=c,this.finishNodeAt(t,"SequenceExpression",m,v)):t=c[0]}else t=this.parseParenExpression();if(this.options.preserveParens){var _=this.startNodeAt(r,n);return _.expression=t,this.finishNode(_,"ParenthesizedExpression")}return t},B.parseParenItem=function(e){return e},B.parseParenArrowList=function(e,t,r){return this.parseArrowExpression(this.startNodeAt(e,t),r)};var q=[];B.parseNew=function(){var e=this.startNode(),t=this.parseIdent(!0);if(this.options.ecmaVersion>=6&&this.eat(l.dot)){e.meta=t;var r=this.containsEsc;return e.property=this.parseIdent(!0),("target"!==e.property.name||r)&&this.raiseRecoverable(e.property.start,"The only valid meta property for new is new.target"),this.inFunction||this.raiseRecoverable(e.start,"new.target can only be used in functions"),this.finishNode(e,"MetaProperty")}var n=this.start,a=this.startLoc;return e.callee=this.parseSubscripts(this.parseExprAtom(),n,a,!0),e.arguments=this.eat(l.parenL)?this.parseExprList(l.parenR,this.options.ecmaVersion>=8,!1):q,this.finishNode(e,"NewExpression")},B.parseTemplateElement=function({isTagged:e}){var t=this.startNode();return this.type===l.invalidTemplate?(e||this.raiseRecoverable(this.start,"Bad escape sequence in untagged template literal"),t.value={raw:this.value,cooked:null}):t.value={raw:this.input.slice(this.start,this.end).replace(/\r\n?/g,"\n"),cooked:this.value},this.next(),t.tail=this.type===l.backQuote,this.finishNode(t,"TemplateElement")},B.parseTemplate=function({isTagged:e=!1}={}){var t=this.startNode();this.next(),t.expressions=[];var r=this.parseTemplateElement({isTagged:e});for(t.quasis=[r];!r.tail;)this.expect(l.dollarBraceL),t.expressions.push(this.parseExpression()),this.expect(l.braceR),t.quasis.push(r=this.parseTemplateElement({isTagged:e}));return this.next(),this.finishNode(t,"TemplateLiteral")},B.isAsyncProp=function(e){return!e.computed&&"Identifier"===e.key.type&&"async"===e.key.name&&(this.type===l.name||this.type===l.num||this.type===l.string||this.type===l.bracketL||this.type.keyword||this.options.ecmaVersion>=9&&this.type===l.star)&&!E.test(this.input.slice(this.lastTokEnd,this.start))},B.parseObj=function(e,t){var r=this.startNode(),n=!0,a={};for(r.properties=[],this.next();!this.eat(l.braceR);){if(n)n=!1;else if(this.expect(l.comma),this.afterTrailingComma(l.braceR))break;var i=this.parseProperty(e,t);e||this.checkPropClash(i,a,t),r.properties.push(i)}return this.finishNode(r,e?"ObjectPattern":"ObjectExpression")},B.parseProperty=function(e,t){var r,n,a,i,s=this.startNode();if(this.options.ecmaVersion>=9&&this.eat(l.ellipsis))return e?(s.argument=this.parseIdent(!1),this.type===l.comma&&this.raise(this.start,"Comma is not permitted after the rest element"),this.finishNode(s,"RestElement")):(this.type===l.parenL&&t&&(t.parenthesizedAssign<0&&(t.parenthesizedAssign=this.start),t.parenthesizedBind<0&&(t.parenthesizedBind=this.start)),s.argument=this.parseMaybeAssign(!1,t),this.type===l.comma&&t&&t.trailingComma<0&&(t.trailingComma=this.start),this.finishNode(s,"SpreadElement"));this.options.ecmaVersion>=6&&(s.method=!1,s.shorthand=!1,(e||t)&&(a=this.start,i=this.startLoc),e||(r=this.eat(l.star)));var o=this.containsEsc;return this.parsePropertyName(s),!e&&!o&&this.options.ecmaVersion>=8&&!r&&this.isAsyncProp(s)?(n=!0,r=this.options.ecmaVersion>=9&&this.eat(l.star),this.parsePropertyName(s,t)):n=!1,this.parsePropertyValue(s,e,r,n,a,i,t,o),this.finishNode(s,"Property")},B.parsePropertyValue=function(e,t,r,n,a,i,s,o){if((r||n)&&this.type===l.colon&&this.unexpected(),this.eat(l.colon))e.value=t?this.parseMaybeDefault(this.start,this.startLoc):this.parseMaybeAssign(!1,s),e.kind="init";else if(this.options.ecmaVersion>=6&&this.type===l.parenL)t&&this.unexpected(),e.kind="init",e.method=!0,e.value=this.parseMethod(r,n);else if(t||o||!(this.options.ecmaVersion>=5)||e.computed||"Identifier"!==e.key.type||"get"!==e.key.name&&"set"!==e.key.name||this.type==l.comma||this.type==l.braceR)this.options.ecmaVersion>=6&&!e.computed&&"Identifier"===e.key.type?(this.checkUnreserved(e.key),e.kind="init",t?e.value=this.parseMaybeDefault(a,i,e.key):this.type===l.eq&&s?(s.shorthandAssign<0&&(s.shorthandAssign=this.start),e.value=this.parseMaybeDefault(a,i,e.key)):e.value=e.key,e.shorthand=!0):this.unexpected();else{(r||n)&&this.unexpected(),e.kind=e.key.name,this.parsePropertyName(e),e.value=this.parseMethod(!1);var c="get"===e.kind?0:1;if(e.value.params.length!==c){var u=e.value.start;this.raiseRecoverable(u,"get"===e.kind?"getter should have no params":"setter should have exactly one param")}else"set"===e.kind&&"RestElement"===e.value.params[0].type&&this.raiseRecoverable(e.value.params[0].start,"Setter cannot use rest params")}},B.parsePropertyName=function(e){if(this.options.ecmaVersion>=6){if(this.eat(l.bracketL))return e.computed=!0,e.key=this.parseMaybeAssign(),this.expect(l.bracketR),e.key;e.computed=!1}return e.key=this.type===l.num||this.type===l.string?this.parseExprAtom():this.parseIdent(!0)},B.initFunction=function(e){e.id=null,this.options.ecmaVersion>=6&&(e.generator=!1,e.expression=!1),this.options.ecmaVersion>=8&&(e.async=!1)},B.parseMethod=function(e,t){var r=this.startNode(),n=this.inGenerator,a=this.inAsync,i=this.yieldPos,s=this.awaitPos,o=this.inFunction;return this.initFunction(r),this.options.ecmaVersion>=6&&(r.generator=e),this.options.ecmaVersion>=8&&(r.async=!!t),this.inGenerator=r.generator,this.inAsync=r.async,this.yieldPos=0,this.awaitPos=0,this.inFunction=!0,this.enterFunctionScope(),this.expect(l.parenL),r.params=this.parseBindingList(l.parenR,!1,this.options.ecmaVersion>=8),this.checkYieldAwaitInDefaultParams(),this.parseFunctionBody(r,!1),this.inGenerator=n,this.inAsync=a,this.yieldPos=i,this.awaitPos=s,this.inFunction=o,this.finishNode(r,"FunctionExpression")},B.parseArrowExpression=function(e,t,r){var n=this.inGenerator,a=this.inAsync,i=this.yieldPos,s=this.awaitPos,o=this.inFunction;return this.enterFunctionScope(),this.initFunction(e),this.options.ecmaVersion>=8&&(e.async=!!r),this.inGenerator=!1,this.inAsync=e.async,this.yieldPos=0,this.awaitPos=0,this.inFunction=!0,e.params=this.toAssignableList(t,!0),this.parseFunctionBody(e,!0),this.inGenerator=n,this.inAsync=a,this.yieldPos=i,this.awaitPos=s,this.inFunction=o,this.finishNode(e,"ArrowFunctionExpression")},B.parseFunctionBody=function(e,t){var r=t&&this.type!==l.braceL,n=this.strict,a=!1;if(r)e.body=this.parseMaybeAssign(),e.expression=!0,this.checkParams(e,!1);else{var i=this.options.ecmaVersion>=7&&!this.isSimpleParamList(e.params);n&&!i||(a=this.strictDirective(this.end),a&&i&&this.raiseRecoverable(e.start,"Illegal 'use strict' directive in function with non-simple parameter list"));var s=this.labels;this.labels=[],a&&(this.strict=!0),this.checkParams(e,!n&&!a&&!t&&this.isSimpleParamList(e.params)),e.body=this.parseBlock(!1),e.expression=!1,this.adaptDirectivePrologue(e.body.body),this.labels=s}this.exitFunctionScope(),this.strict&&e.id&&this.checkLVal(e.id,"none"),this.strict=n},B.isSimpleParamList=function(e){for(var t=0,r=null==e?0:e.length;t<r;t++){var n=e[t];if("Identifier"!==n.type)return!1}return!0},B.checkParams=function(e,t){for(var r={},n=0,a=e.params,i=null==a?0:a.length;n<i;n++){var s=a[n];this.checkLVal(s,"var",t?null:r)}},B.parseExprList=function(e,t,r,n){for(var a=[],i=!0;!this.eat(e);){if(i)i=!1;else if(this.expect(l.comma),t&&this.afterTrailingComma(e))break;var s=void 0;r&&this.type===l.comma?s=null:this.type===l.ellipsis?(s=this.parseSpread(n),n&&this.type===l.comma&&n.trailingComma<0&&(n.trailingComma=this.start)):s=this.parseMaybeAssign(!1,n),a.push(s)}return a},B.checkUnreserved=function({start:e,end:t,name:r}){if(this.inGenerator&&"yield"===r&&this.raiseRecoverable(e,"Can not use 'yield' as identifier inside a generator"),this.inAsync&&"await"===r&&this.raiseRecoverable(e,"Can not use 'await' as identifier inside an async function"),this.isKeyword(r)&&this.raise(e,`Unexpected keyword '${r}'`),!(this.options.ecmaVersion<6&&-1!=this.input.slice(e,t).indexOf("\\"))){var n=this.strict?this.reservedWordsStrict:this.reservedWords;n.test(r)&&(this.inAsync||"await"!==r||this.raiseRecoverable(e,"Can not use keyword 'await' outside an async function"),this.raiseRecoverable(e,`The keyword '${r}' is reserved`))}},B.parseIdent=function(e,t){var r=this.startNode();return e&&"never"==this.options.allowReserved&&(e=!1),this.type===l.name?r.name=this.value:this.type.keyword?(r.name=this.type.keyword,"class"!==r.name&&"function"!==r.name||this.lastTokEnd===this.lastTokStart+1&&46===this.input.charCodeAt(this.lastTokStart)||this.context.pop()):this.unexpected(),this.next(),this.finishNode(r,"Identifier"),e||this.checkUnreserved(r),r},B.parseYield=function(){this.yieldPos||(this.yieldPos=this.start);var e=this.startNode();return this.next(),this.type==l.semi||this.canInsertSemicolon()||this.type!=l.star&&!this.type.startsExpr?(e.delegate=!1,e.argument=null):(e.delegate=this.eat(l.star),e.argument=this.parseMaybeAssign()),this.finishNode(e,"YieldExpression")},B.parseAwait=function(){this.awaitPos||(this.awaitPos=this.start);var e=this.startNode();return this.next(),e.argument=this.parseMaybeUnary(null,!0),this.finishNode(e,"AwaitExpression")};var z=V.prototype;z.raise=function(e,t){var r=L(this.input,e);t+=" ("+r.line+":"+r.column+")";var n=new SyntaxError(t);throw n.pos=e,n.loc=r,n.raisedAt=this.pos,n},z.raiseRecoverable=z.raise,z.curPosition=function(){if(this.options.locations)return new C(this.curLine,this.pos-this.lineStart)};var H=V.prototype;H.toAssignable=function(e,t,r){if(this.options.ecmaVersion>=6&&e)switch(e.type){case"Identifier":this.inAsync&&"await"===e.name&&this.raise(e.start,"Can not use 'await' as identifier inside an async function");break;case"ObjectPattern":case"ArrayPattern":case"RestElement":break;case"ObjectExpression":e.type="ObjectPattern",r&&this.checkPatternErrors(r,!0);for(var n=0,a=e.properties,i=null==a?0:a.length;n<i;n++){var s=a[n];this.toAssignable(s,t),"RestElement"!==s.type||"ArrayPattern"!==s.argument.type&&"ObjectPattern"!==s.argument.type||this.raise(s.argument.start,"Unexpected token")}break;case"Property":"init"!==e.kind&&this.raise(e.key.start,"Object pattern can't contain getter or setter"),this.toAssignable(e.value,t);break;case"ArrayExpression":e.type="ArrayPattern",r&&this.checkPatternErrors(r,!0),this.toAssignableList(e.elements,t);break;case"SpreadElement":e.type="RestElement",this.toAssignable(e.argument,t),"AssignmentPattern"===e.argument.type&&this.raise(e.argument.start,"Rest elements cannot have a default value");break;case"AssignmentExpression":"="!==e.operator&&this.raise(e.left.end,"Only '=' operator can be used for specifying default value."),e.type="AssignmentPattern",delete e.operator,this.toAssignable(e.left,t);case"AssignmentPattern":break;case"ParenthesizedExpression":this.toAssignable(e.expression,t);break;case"MemberExpression":if(!t)break;default:this.raise(e.start,"Assigning to rvalue")}else r&&this.checkPatternErrors(r,!0);return e},H.toAssignableList=function(e,t){for(var r=e.length,n=0;n<r;n++){var a=e