fix: Relax simple expression requirements for default values

Resolves #1552

src/lib/converter/convert-expression.ts

@@ -26,9 +26,23 @@ export function convertExpression(expression: ts.Expression) {
         case ts.SyntaxKind.NumericLiteral:
         case ts.SyntaxKind.PrefixUnaryExpression:
             return expression.getText();
-        default:
-            // More complex expressions are generally not useful in the documentation.
-            // Show that there was a value, but not specifics.
-            return "...";
     }
+
+    if (
+        ts.isArrayLiteralExpression(expression) &&
+        expression.elements.length === 0
+    ) {
+        return "[]";
+    }
+
+    if (
+        ts.isObjectLiteralExpression(expression) &&
+        expression.properties.length === 0
+    ) {
+        return "{}";
+    }
+
+    // More complex expressions are generally not useful in the documentation.
+    // Show that there was a value, but not specifics.
+    return "...";
 }

src/test/converter/variables/specs.json

@@ -247,7 +247,7 @@
               }
             }
           },
-          "defaultValue": "..."
+          "defaultValue": "[]"
         },
         {
           "id": 8,
@@ -271,7 +271,7 @@
             ],
             "name": "Array"
           },
-          "defaultValue": "..."
+          "defaultValue": "{}"
         }
       ],
       "groups": [

src/test/converter/variables/specs.nodoc.json

@@ -247,7 +247,7 @@
               }
             }
           },
-          "defaultValue": "..."
+          "defaultValue": "[]"
         },
         {
           "id": 8,
@@ -271,7 +271,7 @@
             ],
             "name": "Array"
           },
-          "defaultValue": "..."
+          "defaultValue": "{}"
         }
       ],
       "groups": [

src/test/converter2.test.ts

@@ -179,6 +179,13 @@ const issueTests: Record<string, (project: ProjectReflection) => void> = {
             ["Test", "ThingA", "ThingB"]
         );
     },
+
+    gh1552(project) {
+        equal(query(project, "emptyArr").defaultValue, "[]");
+        equal(query(project, "nonEmptyArr").defaultValue, "...");
+        equal(query(project, "emptyObj").defaultValue, "{}");
+        equal(query(project, "nonEmptyObj").defaultValue, "...");
+    },
 };
 
 describe("Converter2", () => {

src/test/converter2/issues/gh1552.ts

@@ -0,0 +1,4 @@
+export const emptyArr = [];
+export const nonEmptyArr = [1];
+export const emptyObj = {};
+export const nonEmptyObj = { x: 1 };