Any suggestion about asp-fallback-test?

[chucklu]

asp-fallback-test
The script method defined in the primary script to use for the fallback test. For more information, see FallbackTestExpression.

I am trying to use asp-fallback-test attribute to check if the script from cdn is loaded with integrity check.
Currently we use window.jQuery for jQuery and use window.axios for https://cdn.bootcdn.net/ajax/libs/axios/0.19.2/axios.min.js as the asp-fallback-test.

Related references
https://stackoverflow.com/questions/40626754/how-to-use-fallback-source-on-scripttaghelper-and-linktaghelper-correctly
aspnet/Mvc#1576
aspnet/Mvc#1580

[chucklu]

Currently we are using _.assign as ap-fallback-test value, I am not sure if it's the best practice.
And why you did not export this js library to window as the other libraries did? Maybe something like window.lodash

[aprofessionalpirate]

_.assign did not work for me (it causes Uncaught ReferenceError: _ is not defined if the lodash js file is not found) however simply window._ seems to work well for me.