ReferenceError: Metadata for "GoogleMaps.GMSGeometryDistance" found but symbol not available at runtime - ios

Question

I'm using the nativescript-google-maps-utils plugin in a NativeScript JavaScript project to access GoogleMapsUtils functions (GMSGeometryDistance, GMSGeometryInterpolate, and GMSGeometryHeading) so that I can traverse a polyline. The Android equivalents work fine on Android devices, and the iOS functions listed work on an iOS simulator, but on an iOS device I get the exception,
ReferenceError: Metadata for "GoogleMaps.GMSGeometryDistance" found but symbol not available at runtime.
I've been chasing this for the better part of a day and still don't have any leads; I'd welcome any insight.
[edit]
It's worth mentioning I've done the usual removal of the platforms, hooks, and node-modules folders and rebuilt, with no change in the error.
Here's the first line of code that triggers the error:
let lineDistance = GMSGeometryDistance(latlngs[i], latlngs[i + 1]);
[edit 2]
Still chasing this... I gather from this issue that I need to create a file with a list of exported symbols, and this issue kind of suggests how that could be done, but I'm not understanding how that applies to this situation.
That is, the question at hand now is how can I determine the symbols from the iOS GoogleMapsUtils static library? This is becoming more of an iOS and Xcode question that NativeScript or JavaScript.
[edit 3]
Sigh... I did get this working using the answer I provided below, but now that same approach is no longer working. No idea why :-(
[edit 4]
I re-reviewed the links I referenced above and included the STRIPFLAGS option and now the code works properly. I revised the answer to include this, and to edit build.xcconfig rather than the project file.

Answer 1

After another day's investigation I was able to get this working. Here's what it took.
Navigate to /platforms/iOS/Pods/GoogleMaps/Maps/Frameworks/GoogleMaps.framework/
Run nm --defined-only GoogleMaps | grep " T " | cut -f 3 -d' ' | egrep -v '^$|GoogleMaps'
Notice the names of the symbols. In my case each one I needed was the function name prefixed with an underscore
Create the file exportedSymbols.txt in /app/App_Resources/iOS
Add the symbols to the file. In my case the contents is:
_GMSGeometryDistance
_GMSGeometryHeading
_GMSGeometryInterpolate
Edit the file app/App_Resources/iOS/build.xcconfig and add these two lines
STRIPFLAGS=$(inherited) -s {PROJECT_DIR}/../../app/App_Resources/iOS/exportedSymbols.txt
EXPORTED_SYMBOLS_FILE = ${PROJECT_DIR}/../../app/App_Resources/iOS/exportedSymbols.txt
So far this is working in my tests on both iOS simulators and devices.