From 2692e783b40ce16207fa1a8e8513ebb5455fd2d0 Mon Sep 17 00:00:00 2001
From: Richard Moore <github@ricmoo.com>
Date: Mon, 30 Mar 2020 15:11:23 -0400
Subject: [PATCH] Fixed Event args keyword access.

---
 packages/abi/src.ts/coders/abstract-coder.ts |  4 +--
 packages/abi/src.ts/coders/array.ts          |  2 +-
 packages/abi/src.ts/interface.ts             |  5 +--
 packages/contracts/src.ts/index.ts           |  3 +-
 packages/properties/src.ts/index.ts          | 35 ++++++++++++--------
 5 files changed, 30 insertions(+), 19 deletions(-)

diff --git a/packages/abi/src.ts/coders/abstract-coder.ts b/packages/abi/src.ts/coders/abstract-coder.ts
index c3d11e0951..a8468e58a4 100644
--- a/packages/abi/src.ts/coders/abstract-coder.ts
+++ b/packages/abi/src.ts/coders/abstract-coder.ts
@@ -8,8 +8,8 @@ import { Logger } from "@ethersproject/logger";
 import { version } from "../_version";
 const logger = new Logger(version);
 
-export interface Result extends Array<any> {
-    [key: string]: any;
+export interface Result extends ReadonlyArray<any> {
+    readonly [key: string]: any;
 }
 
 export type CoerceFunc = (type: string, value: any) => any;
diff --git a/packages/abi/src.ts/coders/array.ts b/packages/abi/src.ts/coders/array.ts
index a065183381..12f7d9f435 100644
--- a/packages/abi/src.ts/coders/array.ts
+++ b/packages/abi/src.ts/coders/array.ts
@@ -102,7 +102,7 @@ export function unpack(reader: Reader, coders: Array<Coder>): Array<any> {
         values[name] = values[index];
     });
 
-    return values;
+    return Object.freeze(values);
 }
 
 
diff --git a/packages/abi/src.ts/interface.ts b/packages/abi/src.ts/interface.ts
index 6c1ad09b55..213c4f57f7 100644
--- a/packages/abi/src.ts/interface.ts
+++ b/packages/abi/src.ts/interface.ts
@@ -400,7 +400,7 @@ export class Interface {
         let resultIndexed = (topics != null) ? this._abiCoder.decode(indexed, concat(topics)): null;
         let resultNonIndexed = this._abiCoder.decode(nonIndexed, data);
 
-        let result: Result = [ ];
+        let result: (Array<any> & { [ key: string ]: any }) = [ ];
         let nonIndexedIndex = 0, indexedIndex = 0;
         eventFragment.inputs.forEach((param, index) => {
             if (param.indexed) {
@@ -416,10 +416,11 @@ export class Interface {
             } else {
                 result[index] = resultNonIndexed[nonIndexedIndex++];
             }
+
             if (param.name && result[param.name] == null) { result[param.name] = result[index]; }
         });
 
-        return result;
+        return Object.freeze(result);
     }
 
     // Given a transaction, find the matching function fragment (if any) and
diff --git a/packages/contracts/src.ts/index.ts b/packages/contracts/src.ts/index.ts
index b251b99d73..176d9b64f4 100644
--- a/packages/contracts/src.ts/index.ts
+++ b/packages/contracts/src.ts/index.ts
@@ -244,7 +244,8 @@ function runMethod(contract: Contract, functionName: string, options: RunOptions
                              let parsed: LogDescription = null;
                              try {
                                 parsed = contract.interface.parseLog(log);
-                             } catch (e){}
+                             } catch (e){ }
+
                              if (parsed) {
                                  event.args = parsed.args;
                                  event.decode = (data: BytesLike, topics?: Array<any>) => {
diff --git a/packages/properties/src.ts/index.ts b/packages/properties/src.ts/index.ts
index 6f825147f4..46f08f8634 100644
--- a/packages/properties/src.ts/index.ts
+++ b/packages/properties/src.ts/index.ts
@@ -72,14 +72,32 @@ export function shallowCopy<T>(object: T): Similar<T> {
     return result;
 }
 
-const opaque: { [key: string]: boolean } = { bigint: true, boolean: true, number: true, string: true };
+const opaque: { [key: string]: boolean } = { bigint: true, boolean: true, "function": true, number: true, string: true };
+
+function _isFrozen(object: any): boolean {
+
+    // Opaque objects are not mutable, so safe to copy by assignment
+    if (object === undefined || object === null || opaque[typeof(object)]) { return true; }
+
+    if (Array.isArray(object) || typeof(object) === "object") {
+        if (!Object.isFrozen(object)) { return false; }
+
+        const keys = Object.keys(object);
+        for (let i = 0; i < keys.length; i++) {
+            if (!_isFrozen(object[keys[i]])) { return false; }
+        }
+
+        return true;
+    }
+
+    return logger.throwArgumentError(`Cannot deepCopy ${ typeof(object) }`, "object", object);
+}
 
 // Returns a new copy of object, such that no properties may be replaced.
 // New properties may be added only to objects.
 function _deepCopy(object: any): any {
 
-    // Opaque objects are not mutable, so safe to copy by assignment
-    if (object === undefined || object === null || opaque[typeof(object)]) { return object; }
+    if (_isFrozen(object)) { return object; }
 
     // Arrays are mutable, so we need to create a copy
     if (Array.isArray(object)) {
@@ -87,10 +105,6 @@ function _deepCopy(object: any): any {
     }
 
     if (typeof(object) === "object") {
-
-        // Immutable objects are safe to just use
-        if (Object.isFrozen(object)) { return object; }
-
         const result: { [ key: string ]: any } = {};
         for (const key in object) {
             const value = object[key];
@@ -101,12 +115,7 @@ function _deepCopy(object: any): any {
         return result;
     }
 
-    // The function type is also immutable, so safe to copy by assignment
-    if (typeof(object) === "function") {
-        return object;
-    }
-
-    logger.throwArgumentError(`Cannot deepCopy ${ typeof(object) }`, "object", object);
+    return logger.throwArgumentError(`Cannot deepCopy ${ typeof(object) }`, "object", object);
 }
 
 export function deepCopy<T>(object: T): Similar<T> {