fix: enforce posix delimiter on all gitignore filtered paths

index.js

@@ -5,7 +5,6 @@ const globby = require('globby');
 const isEqual = require('lodash.isequal');
 const multimatch = require('multimatch');
 const arrify = require('arrify');
-const slash = require('slash');
 const optionsManager = require('./options-manager');
 
 exports.lintText = (str, opts) => {
@@ -31,7 +30,7 @@ exports.lintText = (str, opts) => {
 	if (opts.filename) {
 		const filename = path.relative(opts.cwd, opts.filename);
 		const isIgnored = multimatch(filename, opts.ignores).length > 0;
-		const isGitIgnored = !optionsManager.getGitIgnoreFilter(opts)(slash(opts.filename));
+		const isGitIgnored = !optionsManager.getGitIgnoreFilter(opts)(opts.filename);
 
 		if (isIgnored || isGitIgnored) {
 			return {
@@ -62,6 +61,7 @@ exports.lintFiles = (patterns, opts) => {
 	return globby(patterns, {ignore: opts.ignores, nodir: true}).then(paths => {
 		// Filter out unwanted file extensions
 		// for silly users that don't specify an extension in the glob pattern
+
 		paths = paths
 			.filter(ignoreFilter)
 			.filter(x => {

options-manager.js

@@ -255,7 +255,7 @@ const getGitIgnoreFilter = opts => {
 		i.add(lines)
 	});
 
-	return p => !i.ignores(path.relative(opts.cwd, p));
+	return p => !i.ignores(slash(path.relative(opts.cwd, p)));
 }
 
 const preprocess = opts => {