refactor: remove dup of code from linter.js (#202)

* refactor: remove dup of code from linter.js

* refactor: removing unnecessary function

---------

Co-authored-by: Ricardo Gobbo de Souza <ricardogobbosouza@yahoo.com.br>

README.md

@@ -36,7 +36,7 @@ or
 pnpm add -D eslint-webpack-plugin
 ```
 
-> **Note**: 
+> **Note**:
 >
 > You also need to install `eslint >= 8` from npm, if you haven't already:
 

src/linter.js

@@ -2,6 +2,7 @@ const { dirname, isAbsolute, join } = require('path');
 
 const ESLintError = require('./ESLintError');
 const { getESLint } = require('./getESLint');
+const { arrify } = require('./utils');
 
 /** @typedef {import('eslint').ESLint} ESLint */
 /** @typedef {import('eslint').ESLint.Formatter} Formatter */
@@ -59,7 +60,7 @@ function linter(key, options, compilation) {
    * @param {string | string[]} files
    */
   function lint(files) {
-    for (const file of asList(files)) {
+    for (const file of arrify(files)) {
       delete crossRunResultStorage[file];
     }
     rawResults.push(
@@ -192,10 +193,7 @@ function parseResults(options, results) {
       );
 
       if (messages.length > 0) {
-        errors.push({
-          ...file,
-          messages,
-        });
+        errors.push({ ...file, messages });
       }
     }
 
@@ -205,10 +203,7 @@ function parseResults(options, results) {
       );
 
       if (messages.length > 0) {
-        warnings.push({
-          ...file,
-          messages,
-        });
+        warnings.push({ ...file, messages });
       }
     }
   });
@@ -267,20 +262,21 @@ async function removeIgnoredWarnings(eslint, results) {
     //   fatal is false for ignored file warnings.
     //   ruleId is unset for internal ESLint errors.
     //   line is unset for warnings not involving file contents.
+    const { messages, warningCount, errorCount, filePath } = result;
+    const [firstMessage] = messages;
+    const hasWarning = warningCount === 1 && errorCount === 0;
     const ignored =
-      result.messages.length === 0 ||
-      (result.warningCount === 1 &&
-        result.errorCount === 0 &&
-        !result.messages[0].fatal &&
-        !result.messages[0].ruleId &&
-        !result.messages[0].line &&
-        (await eslint.isPathIgnored(result.filePath)));
-
+      messages.length === 0 ||
+      (hasWarning &&
+        !firstMessage.fatal &&
+        !firstMessage.ruleId &&
+        !firstMessage.line &&
+        (await eslint.isPathIgnored(filePath)));
     return ignored ? false : result;
   });
 
   // @ts-ignore
-  return (await Promise.all(filterPromises)).filter((result) => !!result);
+  return (await Promise.all(filterPromises)).filter(Boolean);
 }
 
 /**
@@ -308,12 +304,4 @@ function getResultStorage({ compiler }) {
   return storage;
 }
 
-/**
- * @param {string | string[]} x
- */
-function asList(x) {
-  /* istanbul ignore next */
-  return Array.isArray(x) ? x : [x];
-}
-
 module.exports = linter;