Inital build

frontend/node_modules/custom-error-instance/examples/about.js

@@ -0,0 +1,46 @@
+var CustomError = require('../index');
+
+// define a custom error with a default message
+var Parent = CustomError('ParentError', { message: 'Parent error' });
+
+// define a custom error that inherits from the Parent custom error
+var Child = CustomError('ChildError', Parent, { message: 'Child error' });
+
+var e;
+
+// create an error instance that uses defaults
+e = Parent();
+console.log(e.toString());          // "ParentError: Parent error"
+console.log(e.message);             // "Parent error"
+console.log(e.name);                // "ParentError"
+console.log(e.constructor.name);    // "ParentError"
+console.log(e instanceof Parent);   // true
+console.log(e instanceof Error);    // true
+
+// create an error instance that overwrites the default message
+e = Parent('Hello');
+console.log(e.toString());          // "ParentError: Hello"
+console.log(e.message);             // "Hello"
+console.log(e.name);                // "ParentError"
+console.log(e.constructor.name);    // "ParentError"
+console.log(e instanceof Parent);   // true
+console.log(e instanceof Error);    // true
+
+// create an error instance that overwrites the default message and defines a code
+e = Parent({ message: 'Hello', code: 'XYZ' });
+console.log(e.toString());          // "ParentError XYZ: Hello"
+console.log(e.message);             // "Hello"
+console.log(e.name);                // "ParentError"
+console.log(e.constructor.name);    // "ParentError"
+console.log(e instanceof Parent);   // true
+console.log(e instanceof Error);    // true
+
+// create an error instance of the Child custom error
+e = Child();
+console.log(e.toString());          // "ParentError: Child error"
+console.log(e.message);             // "Child error"
+console.log(e.name);                // "ChildError"
+console.log(e.constructor.name);    // "ChildError"
+console.log(e instanceof Child);    // true
+console.log(e instanceof Parent);   // true
+console.log(e instanceof Error);    // true

frontend/node_modules/custom-error-instance/examples/map.js

@@ -0,0 +1,25 @@
+"use strict";
+var CustomError = require('../index');
+var store = {};
+
+var Err = CustomError('MapError');
+Err.inuse = CustomError(Err, { message: 'The specified key is already in use.', code: 'INUSE' });
+
+function add(key, value) {
+    if (Math.random() < .3) throw new Err('Random Error');
+    if (store.hasOwnProperty(key)) throw new Err.inuse();
+    store[key] = value;
+}
+
+try {
+    add('x', 1);
+    add('x', 2);
+} catch (e) {
+    if (e instanceof Err.inuse) {
+        console.error(e.toString());        // "MapError INUSE: The specified key is already in use."
+    } else if (e instanceof Err) {
+        console.error('Unexpected ' + e);   // "Unexpected MapError: Random Error"
+    } else {
+        throw e;
+    }
+}