Add 'npm explain' command

Pass a specifier or folder path, and it'll explain what that dependency
is doing there.

PR-URL: https://github.com/npm/cli/pull/1776
Credit: @isaacs
Close: #1776
Reviewed-by: @ruyadorno

2 files changed, 5 insertions, 3 deletions

diff --git a/lib/utils/cmd-list.js b/lib/utils/cmd-list.js
index 85e456a83..6328d80d5 100644
--- a/lib/utils/cmd-list.js
+++ b/lib/utils/cmd-list.js
@@ -20,7 +20,8 @@ const shorthands = {
   run: 'run-script',
   'clean-install': 'ci',
   'clean-install-test': 'cit',
-  x: 'exec'
+  x: 'exec',
+  why: 'explain'
 }
 
 const affordances = {
@@ -128,7 +129,8 @@ const cmdList = [
   'run-script',
   'completion',
   'doctor',
-  'exec'
+  'exec',
+  'explain'
 ]
 
 const plumbing = ['birthday', 'help-search']
diff --git a/lib/utils/explain-dep.js b/lib/utils/explain-dep.js
index 773cc5942..facab373b 100644
--- a/lib/utils/explain-dep.js
+++ b/lib/utils/explain-dep.js
@@ -63,7 +63,7 @@ const explainDependents = ({ name, dependents }, depth, color) => {
   // show just the names of the first 5 deps that overflowed the list
   if (dependents.length > max) {
     let len = 0
-    const maxLen = 30
+    const maxLen = 50
     const showNames = []
     for (let i = max; i < dependents.length; i++) {
       const { from: { name } } = dependents[i]