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Viewing file:     index.js (526 B)      -rw-r--r--

'use strict';
const builtinModules = require('builtin-modules');

const moduleSet = new Set(builtinModules);
const NODE_PROTOCOL = 'node:';

module.exports = moduleName => {
	if (typeof moduleName !== 'string') {
		throw new TypeError('Expected a string');
	}

	if (moduleName.startsWith(NODE_PROTOCOL)) {
		moduleName = moduleName.slice(NODE_PROTOCOL.length);
	}

	const slashIndex = moduleName.indexOf('/');
	if (slashIndex !== -1) {
		moduleName = moduleName.slice(0, slashIndex);
	}

	return moduleSet.has(moduleName);
};