I believe it was working yesterday...
Something must have been updated and complains about multiple define calls (which is ok, because only one is anonymous) in the file.
To reproduce just install aurelia skeleton, do npm install and try gulp bundle.
Loading npm:aurelia-loader-default@1.0.0-beta.1.1.1.js Error: Multiple anonymous defines. at ParseTreeTransformer.AMDDependenciesTransformer.transformCallExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\systemjs-builder\compilers\amd.js:98:13) at CallExpression.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:6649:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformExpressionStatement (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9504:31) at ExpressionStatement.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7120:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformList (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9200:34) at ParseTreeTransformer.transformFunctionBody (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9574:31) at FunctionBody.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7293:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformFunctionExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9596:25) at ParseTreeTransformer.AMDDependenciesTransformer.transformFunctionExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\systemjs-builder\compilers\amd.js:61:69) at FunctionExpression.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7339:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformBinaryExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9299:26) at BinaryExpression.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:6557:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformExpressionStatement (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9504:31) at ExpressionStatement.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7120:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformList (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9200:34) at ParseTreeTransformer.transformBlock (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9317:31) at Block.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:6612:28)
I believe it was working yesterday... Something must have been updated and complains about multiple define calls (which is ok, because only one is anonymous) in the file.
Maybe release of new version of https://www.npmjs.com/package/systemjs-builder broke things?
To reproduce just install aurelia skeleton, do npm install and try gulp bundle.
Loading npm:aurelia-loader-default@1.0.0-beta.1.1.1.js Error: Multiple anonymous defines. at ParseTreeTransformer.AMDDependenciesTransformer.transformCallExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\systemjs-builder\compilers\amd.js:98:13) at CallExpression.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:6649:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformExpressionStatement (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9504:31) at ExpressionStatement.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7120:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformList (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9200:34) at ParseTreeTransformer.transformFunctionBody (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9574:31) at FunctionBody.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7293:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformFunctionExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9596:25) at ParseTreeTransformer.AMDDependenciesTransformer.transformFunctionExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\systemjs-builder\compilers\amd.js:61:69) at FunctionExpression.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7339:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformBinaryExpression (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9299:26) at BinaryExpression.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:6557:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformExpressionStatement (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9504:31) at ExpressionStatement.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:7120:28) at ParseTreeTransformer.transformAny (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9193:44) at ParseTreeTransformer.transformList (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9200:34) at ParseTreeTransformer.transformBlock (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:9317:31) at Block.$__super.transform (D:\code\skeleton-navigation-master\skeleton-typescript-asp.net5\src\skeleton-navigation-typescript-vs\node_modules\traceur\bin\traceur.js:6612:28)