Merge pull request #6 from buildo/add-autobound

add autobound

lib/decorators/autobound.js

@@ -0,0 +1,33 @@
+'use strict';
+
+exports.__esModule = true;
+exports['default'] = autobound;
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
+
+var _tcomb = require('tcomb');
+
+var _tcomb2 = _interopRequireDefault(_tcomb);
+
+function autobound(target, key, descriptor) {
+  var value = descriptor.value;
+
+  if (process.env.NODE_ENV !== 'production') {
+    _tcomb2['default'].assert(_tcomb2['default'].Func.is(value), '@autobound decorator can only be applied to methods');
+  }
+
+  return {
+    configurable: true,
+    get: function get() {
+      var boundValue = value.bind(this);
+      Object.defineProperty(this, key, {
+        value: boundValue,
+        configurable: true,
+        writable: true
+      });
+      return boundValue;
+    }
+  };
+}
+
+module.exports = exports['default'];

lib/index.js

@@ -68,4 +68,10 @@ var _decoratorsSkinnable = require('./decorators/skinnable');
 
 var _decoratorsSkinnable2 = _interopRequireDefault(_decoratorsSkinnable);
 
-exports.skinnable = _decoratorsSkinnable2['default'];
+exports.skinnable = _decoratorsSkinnable2['default'];
+
+var _decoratorsAutobound = require('./decorators/autobound');
+
+var _decoratorsAutobound2 = _interopRequireDefault(_decoratorsAutobound);
+
+exports.autobound = _decoratorsAutobound2['default'];

src/decorators/autobound.js

@@ -0,0 +1,23 @@
+import t from 'tcomb';
+
+export default function autobound(target, key, descriptor) {
+  const { value } = descriptor;
+
+  if (process.env.NODE_ENV !== 'production') {
+    t.assert(t.Func.is(value), `@autobound decorator can only be applied to methods`);
+  }
+
+  return {
+    configurable: true,
+    get() {
+      const boundValue = value.bind(this);
+      Object.defineProperty(this, key, {
+        value: boundValue,
+        configurable: true,
+        writable: true
+      });
+      return boundValue;
+    }
+  };
+}
+

src/index.js

@@ -9,3 +9,4 @@ export props from './decorators/props';
 export pure from './decorators/pure';
 export queries from './decorators/queries';
 export skinnable from './decorators/skinnable';
+export autobound from './decorators/autobound';