fix: eslint package path for cache (#283)

Author: ricardogobbosouza

index.js

@@ -160,21 +160,35 @@ module.exports = function(input, map) {
  loaderUtils.getOptions(webpack)
  );
 
- var userEslintPath = userOptions.eslintPath;
-
  var eslintPkgPath = "eslint/package.json";
- if (userEslintPath) {
- eslintPkgPath = userEslintPath + "/package.json";
+ var userEslintPath = eslintPkgPath;
+
+ if (userOptions.eslintPath) {
+ userEslintPath = userOptions.eslintPath + "/package.json";
+ }
+
+ var eslintVersion;
+
+ try {
+ eslintVersion = require(require.resolve(userEslintPath)).version;
+ } catch (_) {
+ // ignored
  }
 
- var eslintVersion = require(eslintPkgPath).version;
+ if (!eslintVersion) {
+ try {
+ eslintVersion = require(require.resolve(eslintPkgPath)).version;
+ } catch (_) {
+ // ignored
+ }
+ }
 
  var config = assign(
  // loader defaults
  {
  cacheIdentifier: JSON.stringify({
  "eslint-loader": pkg.version,
- eslint: eslintVersion
+ eslint: eslintVersion || "unknown version"
  }),
  eslintPath: "eslint"
  },