From 7a4bfaf8b020a350187602a151bcffbaf9a49c91 Mon Sep 17 00:00:00 2001
From: Ryan Oboril <ryan.oboril@stuzo.com>
Date: Thu, 30 Jun 2022 16:56:40 -0400
Subject: [PATCH] adds support for legacy-peer-deps flag on npm install

---
 bin/cli.js                  | 32 +++++++++++++++++++-------------
 lib/out/install-packages.js |  2 ++
 lib/state/state.js          |  1 +
 3 files changed, 22 insertions(+), 13 deletions(-)

diff --git a/bin/cli.js b/bin/cli.js
index e03fc407..7e03f424 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -29,18 +29,19 @@ const cli = meow(`
           Where to check. Defaults to current directory. Use -g for checking global modules.
 
         Options
-          -u, --update          Interactive update.
-          -y, --update-all      Uninteractive update. Apply all updates without prompting.
-          -g, --global          Look at global modules.
-          -s, --skip-unused     Skip check for unused packages.
-          -p, --production      Skip devDependencies.
-          -d, --dev-only        Look at devDependencies only (skip dependencies).
-          -i, --ignore          Ignore dependencies based on succeeding glob.
-          -E, --save-exact      Save exact version (x.y.z) instead of caret (^x.y.z) in package.json.
-          --specials            List of depcheck specials to include in check for unused dependencies.
-          --no-color            Force or disable color output.
-          --no-emoji            Remove emoji support. No emoji in default in CI environments.
-          --debug               Debug output. Throw in a gist when creating issues on github.
+          -u, --update              Interactive update.
+          -y, --update-all          Uninteractive update. Apply all updates without prompting.
+          -g, --global              Look at global modules.
+          -s, --skip-unused         Skip check for unused packages.
+          -p, --production          Skip devDependencies.
+          -d, --dev-only            Look at devDependencies only (skip dependencies).
+          -i, --ignore              Ignore dependencies based on succeeding glob.
+          -E, --save-exact          Save exact version (x.y.z) instead of caret (^x.y.z) in package.json.
+          -l, --legacy-peer-deps    Disable automatic installation of peer dependencies.
+          --specials                List of depcheck specials to include in check for unused dependencies.
+          --no-color                Force or disable color output.
+          --no-emoji                Remove emoji support. No emoji in default in CI environments.
+          --debug                   Debug output. Throw in a gist when creating issues on github.
 
         Examples
           $ npm-check           # See what can be updated, what isn't being used.
@@ -82,6 +83,10 @@ const cli = meow(`
                 type: 'string',
                 alias: 'i'
             },
+            legacyPeerDeps: {
+                type: 'boolean',
+                alias: 'l'
+            },
             specials: {
                 type: 'string'
             },
@@ -118,7 +123,8 @@ const options = {
     installer: process.env.NPM_CHECK_INSTALLER || 'auto',
     debug: cli.flags.debug,
     spinner: cli.flags.spinner,
-    ignore: cli.flags.ignore
+    ignore: cli.flags.ignore,
+    legacyPeerDeps: cli.flags.legacyPeerDeps,
 };
 
 if (options.debug) {
diff --git a/lib/out/install-packages.js b/lib/out/install-packages.js
index 58637f69..0e1005d5 100644
--- a/lib/out/install-packages.js
+++ b/lib/out/install-packages.js
@@ -9,6 +9,7 @@ function install(packages, currentState) {
 
     const installer = currentState.get('installer');
     const color = chalk.supportsColor ? '--color=always' : null;
+    const legacyPeerDeps = currentState.get("legacyPeerDeps") ? "--legacy-peer-deps" : null;
 
     const isYarn = installer === 'yarn';
 
@@ -22,6 +23,7 @@ function install(packages, currentState) {
         .concat(saveExact)
         .concat(packages)
         .concat(color)
+        .concat(legacyPeerDeps)
         .filter(Boolean);
 
     console.log('');
diff --git a/lib/state/state.js b/lib/state/state.js
index 9b32012b..2d31a19e 100644
--- a/lib/state/state.js
+++ b/lib/state/state.js
@@ -19,6 +19,7 @@ const defaultOptions = {
     spinner: false,
     installer: 'npm',
     ignore: [],
+    legacyPeerDeps: false,
 
     globalPackages: {},
     cwdPackageJson: {devDependencies: {}, dependencies: {}},