3 files changed, 32 insertions, 7 deletions
diff --git a/src/new_fields/Doc.ts b/src/new_fields/Doc.ts
index 59e61023f..45eb2e514 100644
--- a/src/new_fields/Doc.ts
+++ b/src/new_fields/Doc.ts
@@ -67,8 +67,15 @@ export function DocListCast(field: FieldResult): Doc[] {
 export const WidthSym = Symbol("Width");
 export const HeightSym = Symbol("Height");
 
+function fetchProto(doc: Doc) {
+    const proto = doc.proto;
+    if (proto instanceof Promise) {
+        return proto;
+    }
+}
+
 @scriptingGlobal
-@Deserializable("doc").withFields(["id"])
+@Deserializable("doc", fetchProto).withFields(["id"])
 export class Doc extends RefField {
     constructor(id?: FieldId, forceSave?: boolean) {
         super(id);
@@ -133,14 +140,14 @@ export class Doc extends RefField {
         return "invalid";
     }
 
-    public [HandleUpdate](diff: any) {
+    public async [HandleUpdate](diff: any) {
         const set = diff.$set;
         if (set) {
             for (const key in set) {
                 if (!key.startsWith("fields.")) {
                     continue;
                 }
-                const value = SerializationHelper.Deserialize(set[key]);
+                const value = await SerializationHelper.Deserialize(set[key]);
                 const fKey = key.substring(7);
                 this[fKey] = value;
             }
diff --git a/src/new_fields/Proxy.ts b/src/new_fields/Proxy.ts
index 38d874a68..14f08814e 100644
--- a/src/new_fields/Proxy.ts
+++ b/src/new_fields/Proxy.ts
@@ -48,7 +48,7 @@ export class ProxyField<T extends RefField> extends ObjectField {
     private failed = false;
     private promise?: Promise<any>;
 
-    value(): T | undefined | FieldWaiting {
+    value(): T | undefined | FieldWaiting<T> {
         if (this.cache) {
             return this.cache;
         }
@@ -63,6 +63,6 @@ export class ProxyField<T extends RefField> extends ObjectField {
                 return field;
             }));
         }
-        return this.promise;
+        return this.promise as any;
     }
 }
diff --git a/src/new_fields/ScriptField.ts b/src/new_fields/ScriptField.ts
index e8a1ea28a..e1f65fc9c 100644
--- a/src/new_fields/ScriptField.ts
+++ b/src/new_fields/ScriptField.ts
@@ -2,10 +2,11 @@ import { ObjectField } from "./ObjectField";
 import { CompiledScript, CompileScript, scriptingGlobal } from "../client/util/Scripting";
 import { Copy, ToScriptString, Parent, SelfProxy } from "./FieldSymbols";
 import { serializable, createSimpleSchema, map, primitive, object, deserialize, PropSchema, custom, SKIP } from "serializr";
-import { Deserializable } from "../client/util/SerializationHelper";
+import { Deserializable, autoObject } from "../client/util/SerializationHelper";
 import { Doc } from "../new_fields/Doc";
 import { Plugins } from "./util";
 import { computedFn } from "mobx-utils";
+import { ProxyField } from "./Proxy";
 
 function optional(propSchema: PropSchema) {
     return custom(value => {
@@ -34,7 +35,16 @@ const scriptSchema = createSimpleSchema({
     originalScript: true
 });
 
-function deserializeScript(script: ScriptField) {
+async function deserializeScript(script: ScriptField) {
+    const captures: ProxyField<Doc> = (script as any).captures;
+    if (captures) {
+        const doc = (await captures.value())!;
+        const captured: any = {};
+        const keys = Object.keys(doc);
+        const vals = await Promise.all(keys.map(key => doc[key]) as any);
+        keys.forEach((key, i) => captured[key] = vals[i]);
+        (script.script.options as any).capturedVariables = captured;
+    }
     const comp = CompileScript(script.script.originalScript, script.script.options);
     if (!comp.compiled) {
         throw new Error("Couldn't compile loaded script");
@@ -48,9 +58,17 @@ export class ScriptField extends ObjectField {
     @serializable(object(scriptSchema))
     readonly script: CompiledScript;
 
+    @serializable(autoObject())
+    private captures?: ProxyField<Doc>;
+
     constructor(script: CompiledScript) {
         super();
 
+        if (script && script.options.capturedVariables) {
+            const doc = Doc.assign(new Doc, script.options.capturedVariables);
+            this.captures = new ProxyField(doc);
+        }
+
         this.script = script;
     }