Make assert method an assertion function in TS
#840
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This is available since TS 3.7:
https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-7.html#assertion-functions
It could be considered a breaking change. Note that DefinitelyTyped supports officially only the last 2 years of TS releases and that makes 4.1 the last supported version there: https://github.com/DefinitelyTyped/DefinitelyTyped#support-window