js: change the write access for js class methods

--
* src/ [Connection, Error, Key, Keyring, MEssage, Signature, gpgmejs]:
    Functions and values that are not meant to be overwritten are now
    moved into their constructors, thus eliminating the possibility of
    overwrites after initialization.

* Key: The mode of use (synchronous cached, or async promises) ivs now
  determined at initialization of that Key. The property Key.isAsync
  reflects this state.

* unittests: fixed old Key syntax for testing.

* Message.js isComplete is now a method and not a getter anymore.

* Added some startup tests.

1 files changed, 6 insertions, 6 deletions

diff --git a/lang/js/src/Errors.js b/lang/js/src/Errors.js
index cb5c94c2..0cf1af19 100644
--- a/lang/js/src/Errors.js
+++ b/lang/js/src/Errors.js
@@ -143,7 +143,7 @@ export function gpgme_error(code = 'GENERIC_ERROR', info){
  * @extends Error
  */
 class GPGME_Error extends Error{
-    constructor(code, msg=''){
+    constructor(code = 'GENERIC_ERROR', msg=''){
         if (code === 'GNUPG_ERROR' && typeof(msg) === 'string'){
             super(msg);
         } else if (err_list.hasOwnProperty(code)){
@@ -155,12 +155,12 @@ class GPGME_Error extends Error{
         } else {
             super(err_list['GENERIC_ERROR'].msg);
         }
-        this.code = code || 'GENERIC_ERROR';
-    }
-    set code(value){
-        this._code = value;
+        this.getCode = function(){
+            return code;
+        };
     }
+
     get code(){
-        return this._code;
+        return this.getCode();
     }
 }
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