1 files changed, 47 insertions, 0 deletions
diff --git a/src/new_fields/Schema.ts b/src/new_fields/Schema.ts
new file mode 100644
index 000000000..c7d2f0801
--- /dev/null
+++ b/src/new_fields/Schema.ts
@@ -0,0 +1,47 @@
+import { Interface, ToInterface, Cast } from "./Types";
+import { Doc } from "./Doc";
+
+export type makeInterface<T extends Interface> = Partial<ToInterface<T>> & Doc;
+export function makeInterface<T extends Interface>(schema: T): (doc: Doc) => makeInterface<T> {
+    return function (doc: any) {
+        return new Proxy(doc, {
+            get(target, prop) {
+                const field = target[prop];
+                if (prop in schema) {
+                    return Cast(field, (schema as any)[prop]);
+                }
+                return field;
+            }
+        });
+    };
+}
+
+export type makeStrictInterface<T extends Interface> = Partial<ToInterface<T>>;
+export function makeStrictInterface<T extends Interface>(schema: T): (doc: Doc) => makeStrictInterface<T> {
+    const proto = {};
+    for (const key in schema) {
+        const type = schema[key];
+        Object.defineProperty(proto, key, {
+            get() {
+                return Cast(this.__doc[key], type as any);
+            },
+            set(value) {
+                value = Cast(value, type as any);
+                if (value !== undefined) {
+                    this.__doc[key] = value;
+                    return;
+                }
+                throw new TypeError("Expected type " + type);
+            }
+        });
+    }
+    return function (doc: any) {
+        const obj = Object.create(proto);
+        obj.__doc = doc;
+        return obj;
+    };
+}
+
+export function createSchema<T extends Interface>(schema: T): T {
+    return schema;
+}