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Pure ESM package

The package that linked you here is now pure ESM. It cannot be require()'d from CommonJS.

This means you have the following choices:

Use ESM yourself. (preferred)
Use import foo from 'foo' instead of const foo = require('foo') to import the package. You also need to put "type": "module" in your package.json and more. Follow the below guide.
If the package is used in an async context, you could use await import(…) from CommonJS instead of require(…).
Stay on the existing version of the package until you can move to ESM.

	//vanilla js version of https://gist.github.com/sebz/efddfc8fdcb6b480f567

	var lunrIndex,
	$results,
	pagesIndex;

	// Initialize lunrjs using our generated index file
	function initLunr() {
	var request = new XMLHttpRequest();
	request.open('GET', 'js/lunr/index.json', true);

	# 0. Your file name
	FNAME=some.file

	# 1. Somehow sanitize the file content
	# Remove \r (from Windows end-of-lines),
	# Replace tabs by \t
	# Replace " by \"
	# Replace EOL by \n
	CONTENT=$(sed -e 's/\r//' -e's/\t/\\t/g' -e 's/"/\\"/g' "${FNAME}" \| awk '{ printf($0 "\\n") }')