fix(usage): add action items to error output

PR-URL: #2917
Credit: @wraithgar
Close: #2917
Reviewed-by: @ruyadorno

Author: wraithgar

lib/cli.js

@@ -67,7 +67,7 @@ module.exports = (process) => {
         if (cmd) {
           const didYouMean = require('./utils/did-you-mean.js')
           const suggestions = await didYouMean(npm, npm.localPrefix, cmd)
-          npm.output(`Unknown command: "${cmd}"${suggestions}`)
+          npm.output(`Unknown command: "${cmd}"${suggestions}\n\nTo see a list of supported npm commands, run:\n  npm help`)
         } else
           npm.output(npm.usage)
         process.exitCode = 1

lib/run-script.js

@@ -91,7 +91,7 @@ class RunScript extends BaseCommand {
         return
 
       const suggestions = await didYouMean(this.npm, path, event)
-      throw new Error(`Missing script: "${event}"${suggestions}`)
+      throw new Error(`Missing script: "${event}"${suggestions}\n\nTo see a list of scripts, run:\n  npm run`)
     }
 
     // positional args only added to the main event, not pre/post

test/lib/run-script.js

@@ -896,27 +896,27 @@ t.test('workspaces', t => {
       t.match(RUN_SCRIPTS, [])
       t.strictSame(LOG.map(cleanOutput), [
         'Lifecycle script `missing-script` failed with error:',
-        'Error: Missing script: "missing-script"',
+        'Error: Missing script: "missing-script"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: [email protected]',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/a',
         'Lifecycle script `missing-script` failed with error:',
-        'Error: Missing script: "missing-script"',
+        'Error: Missing script: "missing-script"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: [email protected]',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/b',
         'Lifecycle script `missing-script` failed with error:',
-        'Error: Missing script: "missing-script"',
+        'Error: Missing script: "missing-script"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: [email protected]',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/c',
         'Lifecycle script `missing-script` failed with error:',
-        'Error: Missing script: "missing-script"',
+        'Error: Missing script: "missing-script"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: [email protected]',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/d',
         'Lifecycle script `missing-script` failed with error:',
-        'Error: Missing script: "missing-script"',
+        'Error: Missing script: "missing-script"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: e',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/e',
         'Lifecycle script `missing-script` failed with error:',
-        'Error: Missing script: "missing-script"',
+        'Error: Missing script: "missing-script"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: [email protected]',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/noscripts',
       ], 'should log error msgs for each workspace script')
@@ -937,11 +937,11 @@ t.test('workspaces', t => {
       t.match(RUN_SCRIPTS, [])
       t.strictSame(LOG.map(cleanOutput), [
         'Lifecycle script `test` failed with error:',
-        'Error: Missing script: "test"',
+        'Error: Missing script: "test"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: [email protected]',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/a',
         'Lifecycle script `test` failed with error:',
-        'Error: Missing script: "test"',
+        'Error: Missing script: "test"\n\nTo see a list of scripts, run:\n  npm run',
         '  in workspace: [email protected]',
         '  at location: {CWD}/test/lib/run-script-workspaces/packages/b',
       ], 'should log error msgs for each workspace script')