BooleanCompilerOptions usesfeatures

[ajafff]

BooleanCompilerOptions uses [email protected] features

[ajafff]

FWIW, I updated the dependency of TypeScript to >=2.8.0 in v3.0.0 of this library

[ajafff]

tsutils lists its TypeScript dependency as allowing 2.1 and up

Note that the version of TypeScript used to compile your project is not necessarily the version installed in node_modules (at design or run time).

From README.md:

This package is backwards compatible with typescript 2.1.0 at runtime although compiling might need a newer version of typescript installed.

Shipping declaration files for different versions of the compiler is not possible. Especially when adding utilities for newer TypeScript versions.

Compiling with [email protected] succeeds. And that's currently the lowest version I'm actively trying to make this library compatible with at compile time.

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I agree it's a bit surprising this is now a syntax error which cannot be suppressed with skipLibCheck.

Can there be builds added that test with TypeScript at the lowest allowed version?

Sure. Feel free to submit a pull request that ensures the emitted declaration files are compatible with a certain version of TypeScript.