Using axLazyElement with differential builds

[gs-smuthyam]

Hi There,

This is more of a doubt rather an issue.

Does the lib support loading of a element which is built using differential build? If yes, is there an example which we can refer to ?

[tomastrajan]

Hi @gs-smuthyam ! So differential build produces multiple JavaScript bundles right ? So out of the box you have to provide url for your element so you will point only to a single bundle. You could try to point to both and use module: true for the modern one.

Don't remember what is the exact exclusive <script> tag syntax to execute only one and not the other based on browser feature support.

If current state of things is not enough additional flag could be added.

[gs-smuthyam]

Hi @tomastrajan

Thank you for the reply, will try adding both as you mentioned and update here. But the code appears to be loading them independently as I can see in the code

[tomastrajan]

@gs-smuthyam yes, but that also how angular differential loading works, right? It adds two sets of script tags to index.html and only one set gets executed based on browser feature support.

The only question that remains is if the lib constructs mutually exclusive script tags for module: true vs false currently and if not, what is still missing and should be added (will be enabled with additional flag, eg differential: true ).

[gs-smuthyam]

Hi @tomastrajan,

Yeah the build constructs main-es15.js & main-es2015.js and in browser the script tags would be

<script src="main-es2015.js" type="module"></script>
<script src="main-es5.js" nomodule></script>

So below are possible options to choose

1. Accept a collection of scripts (JSON) <stcript, module/nomodule>[]

2. Based on the new flag (differential: true), identify the browser & intelligently rename the script file and load only that. Personally, I would not prefer this approach since this will make things dependent on the library.

Currently to solve our product flow, we are going ahead with this approach as a workaround. Check the browser type and load the appropriate script file.

[tomastrajan]

Hi @gs-smuthyam !

So currently the "problem" is that lib does NOT use nomodule for module: false (which is default) so if two urls are used then both elements will be loaded.

How about this?

<my-element *axLazyElement="url-es5.js; nomodule: true"></my-element>
<my-element *axLazyElement="url-es2015.js; module: true"></my-element>

That way it's fully explicit and can be documented as a technique to use differential loading?

[gs-smuthyam]

Hi @tomastrajan,

We can try out this. If we can make this work, this would be awesome. Indirectly it is same as the one proposed in previous comment ( being able to load multiple script files which user mentioned )

However, I'm afraid, this might not work especially imagine we are dealing with a dashboard where you have number of widgets in place and each of them are identified with unique #id. The moment we add two lazyElements the lib code would try to identify the tag with unique name and will find ambiguity.

I have tried with using multiple elements as you mentioned in modern browser, however ran into tag / unique name ambiguities. So ended up with evaluating and keeping only one axLazyElement by evaluating the browser for the time being.