I am trying to migrate my code from Classic experience to SPfX.
My code is using the
SP.UI.ModalDialog, and I have referenced successfully the
MicrosoftAjax.js, SP.Runtime.js and the
SP.js files in my project, and they are visible as source files in the browser developer tools. However the same approach just doesn't
strings.js, even though I've paid attention that
strings.js is located under the
layouts/15/1033 folder instead of
I keep getting the error message
Unable to get property 'STS' of undefined or null reference
and I am unable to find
strings.js within the source files of my browser developer tools.
The solutions proposed under the links below simply do not apply to SPfX: