Omit warning ts(2686) on JSX files without import React

[fknipp]

Since React 17, the import statement

import React from "react";

is no longer necessary. To omit the warning 'React' refers to a UMD global, but the current file is a module ts(2686), the compiler option for jsx must be set to react-jsx.

My manual changes to jsconfig.json are regularly overwritten by the Meteor Toolbox.

Thanks for providing the Meteor Toolbox! Looking forward to having React support soon, as PR #11 proposes.