From e466bb94c173b1eaaf697590538b0c47651f5efa Mon Sep 17 00:00:00 2001
From: Nathan Shively-Sanders <293473+sandersn@users.noreply.github.com>
Date: Fri, 22 May 2020 09:06:05 -0700
Subject: [PATCH] Fix multi-file usage

1. Follow aliases with getSupers.
2. Make fix in file with superclass, not with the error.
---
 .../codefixes/fixPropertyOverrideAccessor.ts  |  1 +
 src/services/codefixes/generateAccessors.ts   |  7 +++--
 .../codeFixPropertyOverrideAccess3.ts         | 28 +++++++++++++++++++
 3 files changed, 34 insertions(+), 2 deletions(-)
 create mode 100644 tests/cases/fourslash/codeFixPropertyOverrideAccess3.ts

diff --git a/src/services/codefixes/fixPropertyOverrideAccessor.ts b/src/services/codefixes/fixPropertyOverrideAccessor.ts
index 4729042bed..1941b5ccd5 100644
--- a/src/services/codefixes/fixPropertyOverrideAccessor.ts
+++ b/src/services/codefixes/fixPropertyOverrideAccessor.ts
@@ -47,6 +47,7 @@ namespace ts.codefix {
 
             startPosition = baseProp.valueDeclaration.pos;
             endPosition = baseProp.valueDeclaration.end;
+            file = getSourceFileOfNode(baseProp.valueDeclaration);
         }
         else {
             Debug.fail("fixPropertyOverrideAccessor codefix got unexpected error code " + code);
diff --git a/src/services/codefixes/generateAccessors.ts b/src/services/codefixes/generateAccessors.ts
index 4b281139f0..7fed793a2f 100644
--- a/src/services/codefixes/generateAccessors.ts
+++ b/src/services/codefixes/generateAccessors.ts
@@ -229,8 +229,11 @@ namespace ts.codefix {
         while (decl) {
             const superElement = getClassExtendsHeritageElement(decl);
             const superSymbol = superElement && checker.getSymbolAtLocation(superElement.expression);
-            const superDecl = superSymbol && find(superSymbol.declarations, isClassLike);
-            if (superDecl) { res.push(superDecl); }
+            if (!superSymbol) break;
+            const symbol = superSymbol.flags & SymbolFlags.Alias ? checker.getAliasedSymbol(superSymbol) : superSymbol;
+            const superDecl = find(symbol.declarations, isClassLike);
+            if (!superDecl) break;
+            res.push(superDecl);
             decl = superDecl;
         }
         return res;
diff --git a/tests/cases/fourslash/codeFixPropertyOverrideAccess3.ts b/tests/cases/fourslash/codeFixPropertyOverrideAccess3.ts
new file mode 100644
index 0000000000..cc83c8e067
--- /dev/null
+++ b/tests/cases/fourslash/codeFixPropertyOverrideAccess3.ts
@@ -0,0 +1,28 @@
+/// <reference path='fourslash.ts' />
+
+// @strict: true
+
+// @Filename: foo.ts
+//// import { A } from './source'
+//// class B extends A {
+////     get x() { return 2 }
+//// }
+// @Filename: source.ts
+//// export class A {
+////     x = 1
+//// }
+
+verify.codeFix({
+    description: `Generate 'get' and 'set' accessors`,
+    newFileContent: {
+        '/tests/cases/fourslash/source.ts': `export class A {
+    private _x = 1;
+    public get x() {
+        return this._x;
+    }
+    public set x(value) {
+        this._x = value;
+    }
+}`},
+    index: 0
+})