From 248f43b673d3cccef8fc3e95cdfd46cd65ac37c1 Mon Sep 17 00:00:00 2001
From: Milos Djermanovic <milos.djermanovic@gmail.com>
Date: Sat, 24 Jun 2023 18:11:19 +0200
Subject: [PATCH] refactor: remove unnecessary code in `flat-eslint.js`

---
 lib/eslint/flat-eslint.js | 106 +-------------------------------------
 1 file changed, 2 insertions(+), 104 deletions(-)

diff --git a/lib/eslint/flat-eslint.js b/lib/eslint/flat-eslint.js
index 3245808c2af..9d511aab2e8 100644
--- a/lib/eslint/flat-eslint.js
+++ b/lib/eslint/flat-eslint.js
@@ -132,33 +132,6 @@ function calculateStatsPerFile(messages) {
     return stat;
 }
 
-/**
- * It will calculate the error and warning count for collection of results from all files
- * @param {LintResult[]} results Collection of messages from all the files
- * @returns {Object} Contains the stats
- * @private
- */
-function calculateStatsPerRun(results) {
-    const stat = {
-        errorCount: 0,
-        fatalErrorCount: 0,
-        warningCount: 0,
-        fixableErrorCount: 0,
-        fixableWarningCount: 0
-    };
-
-    for (let i = 0; i < results.length; i++) {
-        const result = results[i];
-
-        stat.errorCount += result.errorCount;
-        stat.fatalErrorCount += result.fatalErrorCount;
-        stat.warningCount += result.warningCount;
-        stat.fixableErrorCount += result.fixableErrorCount;
-        stat.fixableWarningCount += result.fixableWarningCount;
-    }
-    return stat;
-}
-
 /**
  * Create rulesMeta object.
  * @param {Map<string,Rule>} rules a map of rules from which to generate the object.
@@ -558,43 +531,6 @@ function shouldMessageBeFixed(message, config, fixTypes) {
     return Boolean(rule && rule.meta && fixTypes.has(rule.meta.type));
 }
 
-/**
- * Collect used deprecated rules.
- * @param {Array<FlatConfig>} configs The configs to evaluate.
- * @returns {IterableIterator<DeprecatedRuleInfo>} Used deprecated rules.
- */
-function *iterateRuleDeprecationWarnings(configs) {
-    const processedRuleIds = new Set();
-
-    for (const config of configs) {
-        for (const [ruleId, ruleConfig] of Object.entries(config.rules)) {
-
-            // Skip if it was processed.
-            if (processedRuleIds.has(ruleId)) {
-                continue;
-            }
-            processedRuleIds.add(ruleId);
-
-            // Skip if it's not used.
-            if (!getRuleSeverity(ruleConfig)) {
-                continue;
-            }
-            const rule = getRuleFromConfig(ruleId, config);
-
-            // Skip if it's not deprecated.
-            if (!(rule && rule.meta && rule.meta.deprecated)) {
-                continue;
-            }
-
-            // This rule was used and deprecated.
-            yield {
-                ruleId,
-                replacedBy: rule.meta.replacedBy || []
-            };
-        }
-    }
-}
-
 /**
  * Creates an error to be thrown when an array of results passed to `getRulesMetaForResults` was not created by the current engine.
  * @returns {TypeError} An error object.
@@ -819,7 +755,6 @@ class FlatESLint {
             errorOnUnmatchedPattern
         } = eslintOptions;
         const startTime = Date.now();
-        const usedConfigs = [];
         const fixTypesSet = fixTypes ? new Set(fixTypes) : null;
 
         // Delete cache file; should this be done here?
@@ -877,15 +812,6 @@ class FlatESLint {
                     return void 0;
                 }
 
-                /*
-                 * Store used configs for:
-                 * - this method uses to collect used deprecated rules.
-                 * - `--fix-type` option uses to get the loaded rule's meta data.
-                 */
-                if (!usedConfigs.includes(config)) {
-                    usedConfigs.push(config);
-                }
-
                 // Skip if there is cached result.
                 if (lintResultCache) {
                     const cachedResult =
@@ -954,22 +880,10 @@ class FlatESLint {
             lintResultCache.reconcile();
         }
 
-        let usedDeprecatedRules;
         const finalResults = results.filter(result => !!result);
 
         return processLintReport(this, {
-            results: finalResults,
-            ...calculateStatsPerRun(finalResults),
-
-            // Initialize it lazily because CLI and `ESLint` API don't use it.
-            get usedDeprecatedRules() {
-                if (!usedDeprecatedRules) {
-                    usedDeprecatedRules = Array.from(
-                        iterateRuleDeprecationWarnings(usedConfigs)
-                    );
-                }
-                return usedDeprecatedRules;
-            }
+            results: finalResults
         });
     }
 
@@ -1031,7 +945,6 @@ class FlatESLint {
         const results = [];
         const startTime = Date.now();
         const resolvedFilename = path.resolve(cwd, filePath || "__placeholder__.js");
-        let config;
 
         // Clear the last used config arrays.
         if (resolvedFilename && await this.isPathIgnored(resolvedFilename)) {
@@ -1040,9 +953,6 @@ class FlatESLint {
             }
         } else {
 
-            // TODO: Needed?
-            config = configs.getConfig(resolvedFilename);
-
             // Do lint.
             results.push(verifyText({
                 text: code,
@@ -1057,21 +967,9 @@ class FlatESLint {
         }
 
         debug(`Linting complete in: ${Date.now() - startTime}ms`);
-        let usedDeprecatedRules;
 
         return processLintReport(this, {
-            results,
-            ...calculateStatsPerRun(results),
-
-            // Initialize it lazily because CLI and `ESLint` API don't use it.
-            get usedDeprecatedRules() {
-                if (!usedDeprecatedRules) {
-                    usedDeprecatedRules = Array.from(
-                        iterateRuleDeprecationWarnings(config)
-                    );
-                }
-                return usedDeprecatedRules;
-            }
+            results
         });
 
     }