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const MODULE_DIR = /(.*([\/\\]node_modules|\.\.)[\/\\](@[^\/\\]+[\/\\])?[^\/\\]+)([\/\\].*)?$/g;
loader: 'babel-loader',
test: /\.jsx?$/,
include(filepath) {
if (filepath.split(/[/\\]/).indexOf('node_modules')===-1) return true;
let pkg, manifest = path.resolve(filepath.replace(MODULE_DIR, '$1'), 'package.json');
try { pkg = JSON.parse(fs.readFileSync(manifest)); } catch (e) {}
return !!(pkg.module || pkg['jsnext:main']);
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lukeed commented Feb 25, 2017

Line 10 should be pkg.module.

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NekR commented Apr 22, 2017

return !!pkg && !!(pkg.module || pkg['jsnext:main']);

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Don't forget to import fs (const fs = require('fs');)

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