Fix TypeScript errors with --noImplicitAny

[sshader]

Running npx tsc --noImplicitAny index.d.ts makes these pop up.

These also appear if importing replicate in a TS project with noImplicitAny.

(I think fixes #109)

[mattt]

Thanks for contributing this fix, @sshader. I'd just merged #110 before seeing this. Everything should be fixed with the latest patch version, v0.14.1.

[sshader]

(oops #110 beat me to it -- I think adding --noImplicitAny / or --strict and checking that the .d.ts compiles with those could be useful?)