From 1a152f50f597067cb6a2a012080f299a48f1acb7 Mon Sep 17 00:00:00 2001
From: jamesgeorge007 <jamesgeorge998001@gmail.com>
Date: Sun, 1 Nov 2020 12:09:20 +0530
Subject: [PATCH] feat: suggest the closest match for an unknown flag

---
 packages/webpack-cli/lib/bootstrap.js | 6 ++++++
 packages/webpack-cli/package.json     | 1 +
 2 files changed, 7 insertions(+)

diff --git a/packages/webpack-cli/lib/bootstrap.js b/packages/webpack-cli/lib/bootstrap.js
index 56996ec64c7..b6fc82879c6 100644
--- a/packages/webpack-cli/lib/bootstrap.js
+++ b/packages/webpack-cli/lib/bootstrap.js
@@ -3,6 +3,7 @@ const { core } = require('./utils/cli-flags');
 const logger = require('./utils/logger');
 const { isCommandUsed } = require('./utils/arg-utils');
 const argParser = require('./utils/arg-parser');
+const leven = require('leven');
 
 process.title = 'webpack-cli';
 
@@ -39,6 +40,11 @@ const runCLI = async (cliArgs) => {
         if (parsedArgs.unknownArgs.length > 0) {
             parsedArgs.unknownArgs.forEach(async (unknown) => {
                 logger.error(`Unknown argument: ${unknown}`);
+                const strippedFlag = unknown.substr(2);
+                const { name: suggestion } = core.find((flag) => leven(strippedFlag, flag.name) < 3);
+                if (suggestion) {
+                    logger.raw(`Did you mean --${suggestion}?`);
+                }
             });
 
             process.exit(2);
diff --git a/packages/webpack-cli/package.json b/packages/webpack-cli/package.json
index c6e0534cd41..67855ac6601 100644
--- a/packages/webpack-cli/package.json
+++ b/packages/webpack-cli/package.json
@@ -37,6 +37,7 @@
     "execa": "^4.1.0",
     "import-local": "^3.0.2",
     "interpret": "^2.2.0",
+    "leven": "^3.1.0",
     "rechoir": "^0.7.0",
     "v8-compile-cache": "^2.2.0",
     "webpack-merge": "^4.2.2"