Erik Dalén a33919717d countries-and-timezones: add null return values (#41443) ...

Some functions can return null when there is no country of timezone corresponding to the input value.
This updates the types to reflect that.

2020-01-07 15:26:11 -08:00

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countries-and-timezones-tests.ts

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index.d.ts

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tsconfig.json

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tslint.json

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