ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which declares all .js files in that package scope as ES modules.

[zkarpinski]

Collecting page data ...Error [ERR_REQUIRE_ESM]: require() of ES Module node_modules\multiple-select-vanilla\dist\cjs\multiple-select.js from node_modules@slickgrid-universal\common\dist\commonjs\filters\selectFilter.js not supported.
multiple-select.js is treated as an ES module file as it is a .js file whose nearest parent package.json contains "type": "module" which declares all .js files in that package scope as ES modules.
Instead rename multiple-select.js to end in .cjs, change the requiring code to use dynamic import() which is available in all CommonJS modules, or change "type": "module" to "type": "commonjs" in node_modules\multiple-select-vanilla\package.json to treat all .js files as CommonJS (using .mjs for all ES modules instead).

[ghiscoding]

I've removed the type="module" in the lib package.json in PR #126, that should hopefully make it work with non-ESM import. Hybrid module is hard to get it all right.

Fix released in v0.4.10, give it a try