Make auth-syncserver build script work on Windows environments

[brentkeller]

Solves

Running pnpm build results in a failure for the @localfirst/auth-syncserver package on Windows environments. This is the error that's encountered:

packages/auth-syncserver postbuild$ tsc -p tsconfig.build.json --emitDeclarationOnly && cp src/*.html dist
│ 'cp' is not recognized as an internal or external command,
│ operable program or batch file.
└─ Failed in 2.1s at C:\dev\xdev\local-first-auth\packages\auth-syncserver
C:\dev\xdev\local-first-auth\packages\auth-syncserver:
 ERR_PNPM_RECURSIVE_RUN_FIRST_FAIL  @localfirst/[email protected] postbuild: `tsc -p tsconfig.build.json --emitDeclarationOnly && cp src/*.html dist`
Exit status 1
 ELIFECYCLE  Command failed with exit code 1.

Description

A pre-cursor to this was to update the pnpm-lock.yaml file to the latest version, which is what I get when running pnpm install against the main branch.

I searched for suggestions on a cross-platform way to copy files in npm scripts and was guided towards shx by this question. This is a wrapper around ShellJS which is a collection of Unix commands implemented in node.js.

It's possible that we'd consider an alternative like copyfiles but I figured it was worth trying out something that could offer multiple commands for our future needs.

Testing

Verify that pnpm build still successfully copies the *.html files to the auth-syncserver build out.