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They added contravariant functions in 2.6 using the compiler flag --strictFunctionTypes as described in this PR https://github.com/Microsoft/TypeScript/pull/186
by besquared 9y ago
They added contravariant functions in 2.6 using the compiler flag --strictFunctionTypes as described in this PR https://github.com/Microsoft/TypeScript/pull/18654 https://github.com/Microsoft/TypeScript/pull/18654