Fix crash in decorator metadata calculation when serializing template literal type nodes (#39481)

Author: weswigham

src/compiler/transformers/ts.ts

@@ -1531,6 +1531,7 @@ namespace ts {
                 case SyntaxKind.LiteralType:
                     switch ((<LiteralTypeNode>node).literal.kind) {
                         case SyntaxKind.StringLiteral:
+                        case SyntaxKind.NoSubstitutionTemplateLiteral:
                             return factory.createIdentifier("String");
 
                         case SyntaxKind.PrefixUnaryExpression:

tests/baselines/reference/templateLiteralsAndDecoratorMetadata.js

@@ -0,0 +1,31 @@
+//// [templateLiteralsAndDecoratorMetadata.ts]
+declare var format: any;
+export class Greeter {
+  @format("Hello, %s")
+  greeting: `boss` | `employee` = `employee`;  //template literals on this line cause the issue
+}
+
+//// [templateLiteralsAndDecoratorMetadata.js]
+"use strict";
+var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
+    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
+    if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
+    else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
+    return c > 3 && r && Object.defineProperty(target, key, r), r;
+};
+var __metadata = (this && this.__metadata) || function (k, v) {
+    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
+};
+exports.__esModule = true;
+exports.Greeter = void 0;
+var Greeter = /** @class */ (function () {
+    function Greeter() {
+        this.greeting = "employee"; //template literals on this line cause the issue
+    }
+    __decorate([
+        format("Hello, %s"),
+        __metadata("design:type", String)
+    ], Greeter.prototype, "greeting");
+    return Greeter;
+}());
+exports.Greeter = Greeter;

tests/baselines/reference/templateLiteralsAndDecoratorMetadata.symbols

@@ -0,0 +1,13 @@
+=== tests/cases/compiler/templateLiteralsAndDecoratorMetadata.ts ===
+declare var format: any;
+>format : Symbol(format, Decl(templateLiteralsAndDecoratorMetadata.ts, 0, 11))
+
+export class Greeter {
+>Greeter : Symbol(Greeter, Decl(templateLiteralsAndDecoratorMetadata.ts, 0, 24))
+
+  @format("Hello, %s")
+>format : Symbol(format, Decl(templateLiteralsAndDecoratorMetadata.ts, 0, 11))
+
+  greeting: `boss` | `employee` = `employee`;  //template literals on this line cause the issue
+>greeting : Symbol(Greeter.greeting, Decl(templateLiteralsAndDecoratorMetadata.ts, 1, 22))
+}

tests/baselines/reference/templateLiteralsAndDecoratorMetadata.types

@@ -0,0 +1,16 @@
+=== tests/cases/compiler/templateLiteralsAndDecoratorMetadata.ts ===
+declare var format: any;
+>format : any
+
+export class Greeter {
+>Greeter : Greeter
+
+  @format("Hello, %s")
+>format("Hello, %s") : any
+>format : any
+>"Hello, %s" : "Hello, %s"
+
+  greeting: `boss` | `employee` = `employee`;  //template literals on this line cause the issue
+>greeting : "boss" | "employee"
+>`employee` : "employee"
+}

tests/cases/compiler/templateLiteralsAndDecoratorMetadata.ts

@@ -0,0 +1,7 @@
+// @experimentalDecorators: true
+// @emitDecoratorMetadata: true
+declare var format: any;
+export class Greeter {
+  @format("Hello, %s")
+  greeting: `boss` | `employee` = `employee`;  //template literals on this line cause the issue
+}