Use import = to match export =

[inlined]

It seems like Firestore updated their version of google-gax which broke Cloud Functions for Firebase. As far as I can tell, the problem stems from using a standard import statement to import a module defined with export =. Per documentation, the correct way to import code exported with export = is to use import = require()

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Fixes #1246 🦕

[summer-ji-eng]

Thanks @inlined for the PR. We are working on this #1245 now.

[alexander-fenster]

It's much harder than that, because we have this import line in all client libraries (populated by tools/compileProtos.ts). We plan to change that import across the board.

[sofisl]

Is this PR OK to close as a duplicate?

[summer-ji-eng]

#1253 should fix the issue. Close for now.