Better organization of tests & other files

src/decorators/exclude.ts

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+export const EXCLUDED_PROPERTIES_KEY = 'serde:excluded_properties';
+
+/* tslint:disable:variable-name only-arrow-functions */
+/**
+ * Adding this decorator prevents the property from being included in the object built by Serde.serialize()
+ */
+export function Exclude(): Function {
+    return function (target: any, key: string): void {
+      Reflect.defineMetadata(
+        EXCLUDED_PROPERTIES_KEY,
+        [
+          ...Reflect.getMetadata(EXCLUDED_PROPERTIES_KEY, target) || [],
+          key
+        ],
+        target
+      );
+    };
+  }

src/decorators/index.ts

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+export * from './exclude';
+export * from './pluck';

src/decorators/pluck.ts

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+export const PLUCK_PROPERTIES_KEY = 'serde:pluck_properties';
+
+/**
+ * Adding this decorator allows for plucking out an T[] or {T: v}[]
+ *
+ * @param field  - use 'fieldName' when creating string|number[],
+ * use ['fieldName'] when creating {[fieldName]: value}[]
+ */
+export function Pluck(field: string | string[]): Function {
+    return function (target: any, key: string): void {
+      Reflect.defineMetadata(PLUCK_PROPERTIES_KEY, {
+        ...Reflect.getMetadata(PLUCK_PROPERTIES_KEY, target) || {},
+        ...{ [key]: field }
+      }, target);
+    };
+  }
+  
+  /* tslint:enable:variable-name */