Added Deferred Error support to Description objects to extent Interface parse methods (#1894).

packages/abi/src.ts/coders/array.ts

@@ -144,6 +144,7 @@ export function unpack(reader: Reader, coders: Array<Coder>): Result {
 
         if (value instanceof Error) {
             Object.defineProperty(values, name, {
+                enumerable: true,
                 get: () => { throw value; }
             });
         } else {
@@ -155,6 +156,7 @@ export function unpack(reader: Reader, coders: Array<Coder>): Result {
         const value = values[i];
         if (value instanceof Error) {
             Object.defineProperty(values, i, {
+                enumerable: true,
                 get: () => { throw value; }
             });
         }

packages/abi/src.ts/interface.ts

@@ -606,6 +606,7 @@ export class Interface {
                 // Make error named values throw on access
                 if (value instanceof Error) {
                     Object.defineProperty(result, param.name, {
+                        enumerable: true,
                         get: () => { throw wrapAccessError(`property ${ JSON.stringify(param.name) }`, value); }
                     });
                 } else {
@@ -619,6 +620,7 @@ export class Interface {
             const value = result[i];
             if (value instanceof Error) {
                 Object.defineProperty(result, i, {
+                    enumerable: true,
                     get: () => { throw wrapAccessError(`index ${ i }`, value); }
                 });
             }

packages/properties/src.ts/index.ts

@@ -73,7 +73,16 @@ function _isFrozen(object: any): boolean {
 
         const keys = Object.keys(object);
         for (let i = 0; i < keys.length; i++) {
-            if (!_isFrozen(object[keys[i]])) { return false; }
+            let value: any = null;
+            try {
+                value = object[keys[i]];
+            } catch (error) {
+                // If accessing a value triggers an error, it is a getter
+                // designed to do so (e.g. Result) and is therefore "frozen"
+                continue;
+            }
+
+            if (!_isFrozen(value)) { return false; }
         }
 
         return true;