npx and stream redirection don't mix well

[lorefnon]

If the package is not locally installed, npx writes to stdout to confirm if user wants the package to be installed or not.

In the README, tql recommends invoking the code generator as npx @timkendall/tql-gen <schema> > sdk.ts

This leaves npx waiting for user input with no output (because stdout was redirected to file) giving the impression that the generator has hung. After enter is pressed we end up with an invalid file looking like this:

Need to install the following packages:
@timkendall/tql-gen
Ok to proceed? (y) import { buildASTSchema, Kind, OperationTypeNode } from "graphql";
...

I propose that the generator accepts a --output/-o file as the recommended means to specify a file to be written to (similar to many other such tools). This can be backward compatible.

[timkendall]

Ah good catch. Agreed. Will get this in tomorrow.