This file is indexed.

/usr/lib/nodejs/string-width/index.js is in node-string-width 2.1.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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'use strict';
const stripAnsi = require('strip-ansi');
const wcwidth = require('wcwidth.js');

module.exports = str => {
	if (typeof str !== 'string' || str.length === 0) {
		return 0;
	}

	str = stripAnsi(str);

	let width = 0;

	for (let i = 0; i < str.length; i++) {
		const code = str.codePointAt(i);

		// Ignore control characters
		if (code <= 0x1F || (code >= 0x7F && code <= 0x9F)) {
			continue;
		}

		// Ignore combining characters
		if (code >= 0x300 && code <= 0x36F) {
			continue;
		}

		// Surrogates
		if (code > 0xFFFF) {
			i++;
		}

		width += wcwidth(code);
	}

	return width;
};