`percy` `--config` fails silently when `.js` config attempts an `import` or `require`

The problem

I'd like to import breakpoints for use in widths in .percy.js. The following .percy.js does not work (i.e. the widths are not respected, and instead the defaults of 375 and 1280 are used) when used via percy snapshot --config=.percy.js snapshots.js, but does when the require line is removed (similarly with the equivalent import).

const { breakpoints } = require("./site-data.js");

module.exports = {
  version: 2,
  snapshot: {
    widths: [378, 1283],
    minHeight: 1024,
    percyCSS: "",
  },
  discovery: {
    networkIdleTimeout: 100,
  },
  static: {
    cleanUrls: false,
  },
  upload: {
    files: "**/*.{png,jpg,jpeg}",
    ignore: "",
    stripExtensions: false,
  },
};

Environment

Node version: v14.18.3 (npm v6.14.15)
@percy/cli version: @percy/cli 1.0.0-beta.76
Version of Percy SDK you’re using: N/A
If needed, a build or snapshot ID: https://percy.io/be8d462e/powderhouse.org/builds/16394515
OS version: macOS 12.1 (21C52)
Type of shell command-line [interface]: zsh

Details

None beyond the above.

Debug logs

It's not clear whether/how the Percy CLI has a --debug or --verbose option.

Code to reproduce issue