lib: render empty string as quotes

Author: DanielMSchmidt

packages/cdktf/lib/hcl/render.ts

@@ -26,6 +26,10 @@ function wrapIdentifierInQuotesIfNeeded(key: string): string {
  *
  */
 function renderString(str: string): string {
+  if (str === "") {
+    return `""`;
+  }
+
   if (!str) {
     return str;
   }
@@ -526,6 +530,10 @@ function renderFuzzyJsonExpression(jsonExpression: any): string {
   }
 
   if (typeof jsonExpression === "string") {
+    if (jsonExpression === "") {
+      return `""`;
+    }
+
     if (jsonExpression.includes("${")) {
       return `"${jsonExpression}"`;
     }
@@ -609,7 +617,7 @@ export function renderAttributes(attributes: any): string {
         !v.hasOwnProperty("dynamic")
       ) {
         if (metaBlocks.includes(name)) {
-          return `${name} { 
+          return `${name} {
 ${renderSimpleAttributes(v)}
 }`;
         }
@@ -643,8 +651,8 @@ ${renderSimpleAttributes(v)}
       }
 
       if (block && type !== "list" && type !== "set") {
-        return `${name} { 
-${renderAttributes(value)} 
+        return `${name} {
+${renderAttributes(value)}
 }`;
       }
       if (type === "list" || type === "set") {

packages/cdktf/test/json-to-hcl.test.ts

@@ -74,6 +74,33 @@ test("string local with quoted name", async () => {
   `);
 });
 
+test("empty string", async () => {
+  const app = Testing.app();
+  const stack = new TerraformStack(app, "test");
+
+  new TerraformLocal(stack, "greeting", {
+    a: "",
+  });
+
+  new TestResource(stack, "test", {
+    name: "",
+  });
+
+  const hcl = Testing.synthHcl(stack);
+  expect(hcl).toMatchInlineSnapshot(`
+    "
+
+    locals {
+        greeting = {
+    a = ""
+    }
+    }
+    resource "test_resource" "test" {
+    name = ""
+    }"
+  `);
+});
+
 test("with provider alias", async () => {
   const app = Testing.app();
   const stack = new TerraformStack(app, "test");