Fix crash when accessing type information

TypeStrong · Sep 22, 2015 · 088100c · 088100c
1 parent 07d8633
commit 088100c
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Showing 2 changed files with 8 additions and 3 deletions.
diff --git a/src/bin/ts-node.ts b/src/bin/ts-node.ts
@@ -189,6 +189,11 @@ function startRepl () {
   ;(<any> repl).defineCommand('type', {
     help: 'Check the type of a TypeScript identifier',
     action: function (identifier: string) {
+      if (!identifier) {
+        ;(<any> repl).displayPrompt()
+        return
+      }
+
       const undo = evalFile.input
 
       evalFile.input += identifier

diff --git a/src/ts-node.ts b/src/ts-node.ts
@@ -152,10 +152,10 @@ export function register (opts?: Options) {
     addFileName(fileName)
 
     const info = service.getQuickInfoAtPosition(fileName, position)
-    const name = ts.displayPartsToString(info.displayParts || [])
-    const comment = ts.displayPartsToString(info.documentation || [])
+    const name = ts.displayPartsToString(info ? info.displayParts : [])
+    const comment = ts.displayPartsToString(info ? info.documentation : [])
 
-    return chalk.bold(name) + (comment ? EOL + comment : '')
+    return chalk.bold(name) + (comment ? `\n${comment}` : '')
   }
 
   // Attach the loader to each defined extension.