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mention strictFunctionTypes #43

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Expand Up @@ -782,6 +782,7 @@ function getLength(o: {+p: ?string}): number {
[TypeScript proposal](https://github.com/Microsoft/TypeScript/issues/10717)

Bivariance is among [the design decisions](https://github.com/Microsoft/TypeScript/wiki/FAQ#why-are-function-parameters-bivariant) driving TypeScript.
Can be turned off for standalone functions with flag `--strictFunctionTypes` since [Typescript 2.6](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-6.html).
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@niieani niieani Sep 18, 2018

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I'm not sure it's clear what a "standalone" function is. Perhaps it's better to call this "for functions that are not methods". Also, this specifically makes the type checking of functions contravariant.


## Useful References

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