execFileSync find fails on Windows

Line 20 in 7b25a76

const stdout = await execFileSync('find', [dirname])

☝️ this is Linux/Mac-specific code. It fails on Windows with "FIND: Parameter format not correct".

The find command on windows is more like grep. The dir /s /b command would be better.

Here's a cross-platform fix:

  let stdout
  if(os.platform() === 'win32') stdout =  execFileSync('cmd', ['/c', 'dir', '/s', '/b', dirname])
  else stdout =  execFileSync('find', [dirname])
  const dirs = String(stdout).split(os.EOL).filter(d => d)

Notice the os.EOL as well, otherwise you end up with a leftover carriage return at the end of each line in Windows.

After getting past that error, the next OS-specific problem is at

lego/bin/compile.mjs

Line 30 in 7b25a76

const filename = f.replace(/.*\/(.+)\.html/, '$1')

On Windows, the regular expression doesn't match the path separator (\). This works:

    const filename = os.platform() === 'win32' ? f.replace(/.*\\(.+)\.html/, '$1') : f.replace(/.*\/(.+)\.html/, '$1')

With those two fixes in place, the build ran and output index.js and my component file in dist.