Cherry-pick PR #44186 into release-4.3 (#44188)

Component commits:
acdaf368c6 Move class name capture for private state until after declaration evaluates

Co-authored-by: Ron Buckton <rbuckton@microsoft.com>

src/compiler/transformers/classFields.ts

@@ -658,13 +658,14 @@ namespace ts {
             }
 
             const staticProperties = getProperties(node, /*requireInitializer*/ false, /*isStatic*/ true);
+            let pendingPrivateStateAssignment: BinaryExpression | undefined;
             if (shouldTransformPrivateElements && some(node.members, m => hasStaticModifier(m) && !!m.name && isPrivateIdentifier(m.name))) {
                 const temp = factory.createTempVariable(hoistVariableDeclaration, /* reservedInNestedScopes */ true);
                 getPrivateIdentifierEnvironment().classConstructor = factory.cloneNode(temp);
-                getPendingExpressions().push(factory.createAssignment(
+                pendingPrivateStateAssignment = factory.createAssignment(
                     temp,
                     factory.getInternalName(node)
-                ));
+                );
             }
 
             const extendsClauseElement = getEffectiveBaseTypeNode(node);
@@ -682,6 +683,10 @@ namespace ts {
                 )
             ];
 
+            if (pendingPrivateStateAssignment) {
+                getPendingExpressions().unshift(pendingPrivateStateAssignment);
+            }
+
             // Write any pending expressions from elided or moved computed property names
             if (some(pendingExpressions)) {
                 statements.push(factory.createExpressionStatement(factory.inlineExpressions(pendingExpressions)));

tests/baselines/reference/privateNameComputedPropertyName4(target=es2015).js

@@ -0,0 +1,39 @@
+//// [privateNameComputedPropertyName4.ts]
+// https://github.com/microsoft/TypeScript/issues/44113
+class C1 {
+    static #qux = 42;
+    ["bar"] () {}
+}
+class C2 {
+    static #qux = 42;
+    static ["bar"] () {}
+}
+class C3 {
+    static #qux = 42;
+    static ["bar"] = "test";
+}
+
+
+//// [privateNameComputedPropertyName4.js]
+var _a, _C1_qux, _b, _C2_qux, _c, _C3_qux;
+// https://github.com/microsoft/TypeScript/issues/44113
+class C1 {
+    ["bar"]() { }
+}
+_a = C1;
+_C1_qux = { value: 42 };
+class C2 {
+    static ["bar"]() { }
+}
+_b = C2;
+_C2_qux = { value: 42 };
+class C3 {
+}
+_c = C3;
+_C3_qux = { value: 42 };
+Object.defineProperty(C3, "bar", {
+    enumerable: true,
+    configurable: true,
+    writable: true,
+    value: "test"
+});

tests/baselines/reference/privateNameComputedPropertyName4(target=esnext).js

@@ -0,0 +1,30 @@
+//// [privateNameComputedPropertyName4.ts]
+// https://github.com/microsoft/TypeScript/issues/44113
+class C1 {
+    static #qux = 42;
+    ["bar"] () {}
+}
+class C2 {
+    static #qux = 42;
+    static ["bar"] () {}
+}
+class C3 {
+    static #qux = 42;
+    static ["bar"] = "test";
+}
+
+
+//// [privateNameComputedPropertyName4.js]
+// https://github.com/microsoft/TypeScript/issues/44113
+class C1 {
+    static #qux = 42;
+    ["bar"]() { }
+}
+class C2 {
+    static #qux = 42;
+    static ["bar"]() { }
+}
+class C3 {
+    static #qux = 42;
+    static ["bar"] = "test";
+}

tests/cases/conformance/classes/members/privateNames/privateNameComputedPropertyName4.ts

@@ -0,0 +1,16 @@
+// @target: esnext, es2015
+// @useDefineForClassFields: true
+// @noTypesAndSymbols: true
+// https://github.com/microsoft/TypeScript/issues/44113
+class C1 {
+    static #qux = 42;
+    ["bar"] () {}
+}
+class C2 {
+    static #qux = 42;
+    static ["bar"] () {}
+}
+class C3 {
+    static #qux = 42;
+    static ["bar"] = "test";
+}