fix: invalid URL error when using expo-server-sdk inside API routes

[Savinvadim1312]

I am using expo-server-sdk in an Expo project inside the API Routes.

When calling expo.sendPushNotificationsAsync([message]); I get an error code: 'ERR_INVALID_URL', input: '/--/api/v2/push/send'

I investigated and the problem seems to come from process.env['EXPO_BASE_URL'] being empty string instead of undefined.

I understand that this might be related to my local setup, but I checked and I don't set the EXPO_BASE_URL env anywhere.

Not exactly sure, but maybe the issue comes from Expo Router API Routes and how env variables are treated there?

Anyway, the suggested fix solves the issue by using the default base url, when the environment var is missing or is empty string.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (4abc85a) to head (6d56935).
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  Coverage   100.00%   100.00%           
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  Lines          168       168           
  Branches        33        33           
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[vonovak]

Thank you, this looks reasonable!