Integrate dojo/diagnostics into dojo/widget-core

[edhager]

Create a new version of dojo/diagnostics that can be integrated into dojo/widget-core to produce messages that can be consumed by a browser plug-in.

Here are some requirements that must be fulfilled:

• Calls to the diagnostics API from Dojo libraries must follow a syntax that can be identified and removed by the Dojo 2 builder (Webpack). A suggestion... Use the dojo/has library to wrap the diagnostics calls. The Dojo 2 builder already has the capability to remove code based on feature detection.

if(has('diagnostics')) { diaganostics.log(...) }

• Use postMessage to publish messages but also allow for messages to be transmitted via a web socket in the future for remote debugging.

For the initial implementation, publish a message that notifies when the virtual DOM is created/updated. Include the virtual DOM tree in the message.

Create a pull request that contains the modification to widget-core so it can be reviewed by the rest of the Dojo 2 team.

[rorticus]

Something to consider,

dojo/widget-core@master...rorticus:diagnostics