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b.prototype.prepend=function(e){if(Array.isArray(e))for(var a=e.length-1;0<=a;a--)this.prepend(e[a]);else if(e instanceof b||"string"===typeof e)this.children.unshift(e);else throw new TypeError("Expected a SourceNode, string, or an array of SourceNodes and strings. Got "+e);return this};b.prototype.walk=function(e){this.children.forEach(function(a){a instanceof b?a.walk(e):""!==a&&e(a,{source:this.source,line:this.line,column:this.column,name:this.name})},this)};b.prototype.join=function(b){var a,
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