# Failed to do transforms - SignalR

**URL:** <https://discourse.aurelia.io/t/failed-to-do-transforms-signalr/4732>\
**Category:** Uncategorized\
**Created:** [April 19, 2022, 7:22pm UTC](https://discourse.aurelia.io/t/failed-to-do-transforms-signalr/4732 "2022-04-19T19:22:38Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![mikeact4](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@mikeact4](https://discourse.aurelia.io/u/mikeact4)\
**Post date:** [April 19, 2022, 7:22pm UTC](https://discourse.aurelia.io/t/failed-to-do-transforms-signalr/4732/1 "2022-04-19T19:22:39Z")

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I am trying to use signalr and can’t build this simple test project using the built-in bundler. Any help would be appreciated.

I created a new project using the following:

√ Please enter a name for your new project: · signalr4  
√ Would you like to use the default setup or customize your choices? · Custom App  
√ Which bundler would you like to use? · CLI’s built-in bundler with an AMD module loader  
√ Which AMD module loader would you like to use? · RequireJS  
√ What platform are you targeting? · Web  
√ What transpiler would you like to use? · Babel  
√ How would you like to setup your HTML template? · None  
√ What css preprocessor would you like to use? · None  
√ Do you want to add PostCSS processing · None  
√ Which unit test runner would you like to use? · None  
√ Would you like to configure integration testing? · None  
√ What is your default code editor? · Visual Studio Code  
√ Which features do you want scaffolded into your project? · Minimum  
√ Would you like to add a Dockerfile? · No

I then added signalR using:

npm i @microsoft/signalr

I modified the app.js to add:

import \* as signalR from ‘@microsoft/signalr’

and then ran ‘au build’ and got an error:

Local aurelia-cli v1.3.1  
Starting ‘readProjectConfiguration’…  
INFO [Bundle] Manually adding package: 2.4.0 aurelia-bootstrapper  
INFO [Bundle] Manually adding package: 1.2.1 aurelia-loader-default  
INFO [Bundle] Manually adding package: 1.8.1 aurelia-pal-browser  
INFO [Bundle] Manually adding package: 1.0.0 aurelia-testing  
INFO [Bundle] Manually adding package: 2.0.16 text  
Finished ‘readProjectConfiguration’  
Starting ‘processMarkup’…  
Starting ‘processJson’…  
Starting ‘processCSS’…  
Starting ‘copyFiles’…  
Starting ‘configureEnvironment’…  
Finished ‘copyFiles’  
Finished ‘processJson’  
Finished ‘processCSS’  
Finished ‘processMarkup’  
Finished ‘configureEnvironment’  
Starting ‘buildJavaScript’…  
Finished ‘buildJavaScript’  
Starting ‘writeBundles’…  
INFO [Bundler] Tracing files …  
INFO [Bundler] Auto tracing package: 6.0.4 @microsoft/signalr  
INFO [Bundler] Auto tracing package: 1.0.3 aurelia-event-aggregator  
INFO [Bundler] Auto tracing package: 1.4.1 aurelia-framework  
INFO [Bundler] Auto tracing package: 1.4.0 aurelia-history-browser  
INFO [Bundler] Auto tracing package: 1.0.2 aurelia-loader  
INFO [Bundler] Auto tracing package: 1.1.1 aurelia-logging-console  
INFO [Bundler] Auto tracing package: 1.0.7 aurelia-metadata  
INFO [Bundler] Auto tracing package: 1.8.2 aurelia-pal  
INFO [Bundler] Auto tracing package: 1.3.4 aurelia-polyfills  
INFO [Bundler] Auto tracing package: 1.6.0 aurelia-templating-binding  
INFO [Bundler] Auto tracing package: 1.14.3 aurelia-templating-resources  
INFO [Bundler] Auto tracing package: 1.5.0 aurelia-templating-router  
INFO [Bundler] Auto tracing package: 0.13.2 regenerator-runtime  
INFO [Bundler] Auto tracing package: 2.5.4 aurelia-binding  
INFO [Bundler] Auto tracing package: 1.5.2 aurelia-dependency-injection  
INFO [Bundler] Auto tracing package: 1.2.1 aurelia-history  
INFO [Bundler] Auto tracing package: 1.5.2 aurelia-logging  
INFO [Bundler] Auto tracing package: 1.1.7 aurelia-path  
INFO [Bundler] Auto tracing package: 1.7.1 aurelia-router  
INFO [Bundler] Auto tracing package: 1.3.3 aurelia-task-queue  
INFO [Bundler] Auto tracing package: 1.11.1 aurelia-templating  
ERROR [Bundler] Failed to do transforms  
INFO [Bundler] Error: Line 29: Unexpected token …  
{  
uid: 10,  
name: ‘writeBundles’,  
branch: false,  
error: Error: Line 29: Unexpected token …  
at ErrorHandler.constructError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:5012:22)  
at ErrorHandler.createError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:5028:27)  
at Parser.unexpectedTokenError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:1985:39)  
at Parser.throwUnexpectedToken (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:1995:21)  
at Parser.parseObjectPropertyKey (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2499:33)  
at Parser.parseObjectProperty (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2534:25)  
at Parser.parseObjectInitializer (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2602:35)  
at Parser.inheritCoverGrammar (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2285:37)  
at Parser.parsePrimaryExpression (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2354:38)  
at Parser.inheritCoverGrammar (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2285:37) {  
index: 814,  
lineNumber: 29,  
description: ‘Unexpected token …’  
},  
duration: [0, 313660300],  
time: 1650396048995  
}  
{  
uid: 0,  
name: ‘’,  
branch: true,  
error: Error: Line 29: Unexpected token …  
at ErrorHandler.constructError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:5012:22)  
at ErrorHandler.createError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:5028:27)  
at Parser.unexpectedTokenError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:1985:39)  
at Parser.throwUnexpectedToken (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:1995:21)  
at Parser.parseObjectPropertyKey (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2499:33)  
at Parser.parseObjectProperty (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2534:25)  
at Parser.parseObjectInitializer (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2602:35)  
at Parser.inheritCoverGrammar (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2285:37)  
at Parser.parsePrimaryExpression (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2354:38)  
at Parser.inheritCoverGrammar (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2285:37) {  
index: 814,  
lineNumber: 29,  
description: ‘Unexpected token …’  
},  
duration: [1, 40438700],  
time: 1650396049001  
}  
Error: Line 29: Unexpected token …  
at ErrorHandler.constructError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:5012:22)  
at ErrorHandler.createError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:5028:27)  
at Parser.unexpectedTokenError (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:1985:39)  
at Parser.throwUnexpectedToken (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:1995:21)  
at Parser.parseObjectPropertyKey (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2499:33)  
at Parser.parseObjectProperty (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2534:25)  
at Parser.parseObjectInitializer (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2602:35)  
at Parser.inheritCoverGrammar (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2285:37)  
at Parser.parsePrimaryExpression (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2354:38)  
at Parser.inheritCoverGrammar (D:\Projects\signalr4\node\_modules\esprima\dist\esprima.js:2285:37) {  
index: 814,  
lineNumber: 29,  
description: ‘Unexpected token …’  
}

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<div class="post-metadata">

**Author:** ![huochunpeng](https://avatars.discourse-cdn.com/v4/letter/h/49beb7/32.png) [@huochunpeng](https://discourse.aurelia.io/u/huochunpeng)\
**Post date:** [April 21, 2022, 2:18am UTC](https://discourse.aurelia.io/t/failed-to-do-transforms-signalr/4732/2 "2022-04-21T02:18:00Z")

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You are on a very old version of cli, upgrade to v2.0.3.  
The old version uses an outdated esprima js parser which doesn’t understand latest js syntax.

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<div class="post-metadata">

**Author:** ![mikeact4](https://avatars.discourse-cdn.com/v4/letter/m/a3d4f5/32.png) [@mikeact4](https://discourse.aurelia.io/u/mikeact4)\
**Post date:** [April 28, 2022, 4:52pm UTC](https://discourse.aurelia.io/t/failed-to-do-transforms-signalr/4732/3 "2022-04-28T16:52:19Z")

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Thanks, that did the trick!