From 0dc74245e2072610d84d0bd03264793bca750315 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <Daniel.Rosenwasser@microsoft.com>
Date: Thu, 27 Jul 2017 12:42:11 -0700
Subject: [PATCH] Added codefix for replacing qualified names with indexed
 access types.

---
 src/compiler/diagnosticMessages.json          |  4 +++
 ...correctQualifiedNameToIndexedAccessType.ts | 27 +++++++++++++++++++
 src/services/codefixes/fixes.ts               |  1 +
 3 files changed, 32 insertions(+)
 create mode 100644 src/services/codefixes/correctQualifiedNameToIndexedAccessType.ts

diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 0d9e7a0a6bf..1ffc78134c3 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -3657,6 +3657,10 @@
         "category": "Message",
         "code": 90025
     },
+    "Rewrite as the indexed access type '{0}'.": {
+        "category": "Message",
+        "code": 90026
+    },
 
     "Convert function to an ES2015 class": {
         "category": "Message",
diff --git a/src/services/codefixes/correctQualifiedNameToIndexedAccessType.ts b/src/services/codefixes/correctQualifiedNameToIndexedAccessType.ts
new file mode 100644
index 00000000000..3087d73276d
--- /dev/null
+++ b/src/services/codefixes/correctQualifiedNameToIndexedAccessType.ts
@@ -0,0 +1,27 @@
+/* @internal */
+namespace ts.codefix {
+    registerCodeFix({
+        errorCodes: [Diagnostics.Cannot_access_0_1_because_0_is_a_type_but_not_a_namespace_Did_you_mean_to_retrieve_the_type_of_the_property_1_in_0_with_0_1.code],
+        getCodeActions: (context: CodeFixContext) => {
+            const sourceFile = context.sourceFile;
+            const token = getTokenAtPosition(sourceFile, context.span.start, /*includeJsDocComment*/ false);
+            const qualifiedName = getAncestor(token, SyntaxKind.QualifiedName) as QualifiedName;
+            Debug.assert(!!qualifiedName, "Expected position to be owned by a qualified name.");
+            if (!isIdentifier(qualifiedName.left)) {
+                return undefined;
+            }
+            const leftText = qualifiedName.left.getText(sourceFile);
+            const rightText = qualifiedName.right.getText(sourceFile);
+            const replacement = createIndexedAccessTypeNode(
+                createTypeReferenceNode(qualifiedName.left, /*typeArguments*/ undefined),
+                createLiteralTypeNode(createLiteral(rightText)));
+            const changeTracker = textChanges.ChangeTracker.fromCodeFixContext(context);
+            changeTracker.replaceNode(sourceFile, qualifiedName, replacement);
+
+            return [{
+                description: formatStringFromArgs(getLocaleSpecificMessage(Diagnostics.Rewrite_as_the_indexed_access_type_0), [`${leftText}["${rightText}"]`]),
+                changes: changeTracker.getChanges()
+            }];
+        }
+    });
+}
diff --git a/src/services/codefixes/fixes.ts b/src/services/codefixes/fixes.ts
index ef670c81ba9..9bc80cad691 100644
--- a/src/services/codefixes/fixes.ts
+++ b/src/services/codefixes/fixes.ts
@@ -1,3 +1,4 @@
+/// <reference path="correctQualifiedNameToIndexedAccessType.ts" />
 /// <reference path="fixClassIncorrectlyImplementsInterface.ts" />
 /// <reference path="fixAddMissingMember.ts" />
 /// <reference path="fixSpelling.ts" />