diff --git a/localtypings/pxteditor.d.ts b/localtypings/pxteditor.d.ts
index 26dd274455a3..6ac5336fd374 100644
--- a/localtypings/pxteditor.d.ts
+++ b/localtypings/pxteditor.d.ts
@@ -1,6 +1,7 @@
 /// <reference path="../built/pxtlib.d.ts" />
 /// <reference path="./projectheader.d.ts" />
 /// <reference path="./validatorPlan.d.ts" />
+/// <reference path="./monaco.d.ts" />
 
 declare namespace pxt.editor {
     export interface EditorMessage {
@@ -1155,6 +1156,7 @@ declare namespace pxt.editor {
         onCodeStop?: () => void;
 
         experiments?: Experiment[];
+        monacoFieldEditors?: MonacoFieldEditorDefinition[];
     }
 
     export interface Experiment {
@@ -1368,6 +1370,47 @@ declare namespace pxt.editor {
     }
 
     type AssetEditorEvent = AssetEditorRequestSaveEvent | AssetEditorReadyEvent;
+
+    export interface TextEdit {
+        range: monaco.Range;
+        replacement: string;
+    }
+
+    export interface MonacoFieldEditorHost {
+        contentDiv(): HTMLDivElement;
+        getText(range: monaco.Range): string;
+        blocksInfo(): pxtc.BlocksInfo;
+
+        package(): pxt.MainPackage;
+        writeFileAsync(filename: string, content: string): Promise<void>;
+        readFile(filename: string): string;
+    }
+
+    export interface MonacoFieldEditor {
+        getId(): string;
+        showEditorAsync(fileType: pxt.editor.FileType, editrange: monaco.Range, host: MonacoFieldEditorHost): Promise<TextEdit>;
+        onClosed(): void;
+        dispose(): void;
+    }
+
+    export interface MonacoFieldEditorDefinition {
+        id: string;
+        matcher: MonacoFindArguments;
+        foldMatches?: boolean;
+        alwaysBuildOnClose?: boolean;
+        glyphCssClass?: string;
+        weight?: number; // higher weight will override lower weight when on same line
+        proto: { new(): MonacoFieldEditor };
+        heightInPixels?: number;
+    }
+
+    export interface MonacoFindArguments {
+        searchString: string;
+        isRegex: boolean;
+        matchWholeWord: boolean;
+        matchCase: boolean;
+        validateRange?: (range: monaco.Range, model: monaco.editor.ITextModel) => monaco.Range;
+    }
 }
 
 declare namespace pxt.workspace {
diff --git a/pxteditor/monaco-fields/field_musiceditor.ts b/pxteditor/monaco-fields/field_musiceditor.ts
index 6306a1179c88..5b87b73fcdf9 100644
--- a/pxteditor/monaco-fields/field_musiceditor.ts
+++ b/pxteditor/monaco-fields/field_musiceditor.ts
@@ -1,5 +1,5 @@
 import { MonacoReactFieldEditor } from "./field_react";
-import { MonacoFieldEditorDefinition, registerMonacoFieldEditor } from "./monacoFieldEditor";
+import { registerMonacoFieldEditor } from "./monacoFieldEditor";
 
 const fieldEditorId = "music-editor";
 
@@ -91,7 +91,7 @@ function createFakeAsset(song: pxt.assets.music.Song): pxt.Song {
     }
 }
 
-export const songEditorDefinition: MonacoFieldEditorDefinition = {
+export const songEditorDefinition: pxt.editor.MonacoFieldEditorDefinition = {
     id: fieldEditorId,
     foldMatches: true,
     glyphCssClass: "fas fa-music sprite-focus-hover",
diff --git a/pxteditor/monaco-fields/field_react.ts b/pxteditor/monaco-fields/field_react.ts
index 9bb9049af571..a155501f0419 100644
--- a/pxteditor/monaco-fields/field_react.ts
+++ b/pxteditor/monaco-fields/field_react.ts
@@ -1,21 +1,19 @@
-import { MonacoFieldEditor, TextEdit, MonacoFieldEditorHost } from "./monacoFieldEditor";
-
 const fieldEditorId = "image-editor";
 
-export class MonacoReactFieldEditor<U> implements MonacoFieldEditor {
-    private resolver: (edit: TextEdit) => void;
+export class MonacoReactFieldEditor<U> implements pxt.editor.MonacoFieldEditor {
+    private resolver: (edit: pxt.editor.TextEdit) => void;
     private rejecter: (err?: any) => void;
 
     protected fileType: pxt.editor.FileType;
     protected editrange: monaco.Range;
-    protected host: MonacoFieldEditorHost;
+    protected host: pxt.editor.MonacoFieldEditorHost;
     protected fv: pxt.react.FieldEditorView<U>;
 
     getId() {
         return fieldEditorId;
     }
 
-    showEditorAsync(fileType: pxt.editor.FileType, editrange: monaco.Range, host: MonacoFieldEditorHost): Promise<TextEdit> {
+    showEditorAsync(fileType: pxt.editor.FileType, editrange: monaco.Range, host: pxt.editor.MonacoFieldEditorHost): Promise<pxt.editor.TextEdit> {
         this.fileType = fileType;
         this.editrange = editrange;
         this.host = host;
diff --git a/pxteditor/monaco-fields/field_soundEffect.ts b/pxteditor/monaco-fields/field_soundEffect.ts
index 4b6bdc1bd7b0..cd746a2cb839 100644
--- a/pxteditor/monaco-fields/field_soundEffect.ts
+++ b/pxteditor/monaco-fields/field_soundEffect.ts
@@ -1,5 +1,5 @@
 import { MonacoReactFieldEditor } from "./field_react";
-import { MonacoFieldEditorDefinition, registerMonacoFieldEditor } from "./monacoFieldEditor";
+import { registerMonacoFieldEditor } from "./monacoFieldEditor";
 
 const fieldEditorId = "soundeffect-editor";
 
@@ -205,7 +205,7 @@ function defaultSound(): pxt.assets.Sound {
     }
 }
 
-export const soundEditorDefinition: MonacoFieldEditorDefinition = {
+export const soundEditorDefinition: pxt.editor.MonacoFieldEditorDefinition = {
     id: fieldEditorId,
     foldMatches: true,
     glyphCssClass: "fas fa-music sprite-focus-hover",
diff --git a/pxteditor/monaco-fields/field_sprite.ts b/pxteditor/monaco-fields/field_sprite.ts
index 3cd8be6ac4f9..e3f172aee639 100644
--- a/pxteditor/monaco-fields/field_sprite.ts
+++ b/pxteditor/monaco-fields/field_sprite.ts
@@ -1,5 +1,5 @@
 import { MonacoReactFieldEditor } from "./field_react";
-import { MonacoFieldEditorDefinition, registerMonacoFieldEditor } from "./monacoFieldEditor";
+import { registerMonacoFieldEditor } from "./monacoFieldEditor";
 
 const fieldEditorId = "image-editor";
 
@@ -76,7 +76,7 @@ function createFakeAsset(bitmap: pxt.sprite.Bitmap): pxt.ProjectImage {
     }
 }
 
-export const spriteEditorDefinition: MonacoFieldEditorDefinition = {
+export const spriteEditorDefinition: pxt.editor.MonacoFieldEditorDefinition = {
     id: fieldEditorId,
     foldMatches: true,
     glyphCssClass: "sprite-editor-glyph sprite-focus-hover",
diff --git a/pxteditor/monaco-fields/field_tilemap.ts b/pxteditor/monaco-fields/field_tilemap.ts
index a207108be603..85b74758c75e 100644
--- a/pxteditor/monaco-fields/field_tilemap.ts
+++ b/pxteditor/monaco-fields/field_tilemap.ts
@@ -1,5 +1,5 @@
 import { MonacoReactFieldEditor } from "./field_react";
-import { MonacoFieldEditorDefinition, registerMonacoFieldEditor } from "./monacoFieldEditor";
+import { registerMonacoFieldEditor } from "./monacoFieldEditor";
 
 const fieldEditorId = "tilemap-editor";
 
@@ -139,7 +139,7 @@ function createFakeAsset(data: pxt.sprite.TilemapData): pxt.ProjectTilemap {
     }
 }
 
-export const tilemapEditorDefinition: MonacoFieldEditorDefinition = {
+export const tilemapEditorDefinition: pxt.editor.MonacoFieldEditorDefinition = {
     id: fieldEditorId,
     foldMatches: true,
     alwaysBuildOnClose: true,
diff --git a/pxteditor/monaco-fields/monacoFieldEditor.ts b/pxteditor/monaco-fields/monacoFieldEditor.ts
index 981935d83b35..fb52900e267b 100644
--- a/pxteditor/monaco-fields/monacoFieldEditor.ts
+++ b/pxteditor/monaco-fields/monacoFieldEditor.ts
@@ -1,49 +1,9 @@
 /// <reference path="../../localtypings/monaco.d.ts" />
 
-export interface TextEdit {
-    range: monaco.Range;
-    replacement: string;
-}
-
-export interface MonacoFieldEditorHost {
-    contentDiv(): HTMLDivElement;
-    getText(range: monaco.Range): string;
-    blocksInfo(): pxtc.BlocksInfo;
-
-    package(): pxt.MainPackage;
-    writeFileAsync(filename: string, content: string): Promise<void>;
-    readFile(filename: string): string;
-}
-
-export interface MonacoFieldEditor {
-    getId(): string;
-    showEditorAsync(fileType: pxt.editor.FileType, editrange: monaco.Range, host: MonacoFieldEditorHost): Promise<TextEdit>;
-    onClosed(): void;
-    dispose(): void;
-}
-
-export interface MonacoFieldEditorDefinition {
-    id: string;
-    matcher: MonacoFindArguments;
-    foldMatches?: boolean;
-    alwaysBuildOnClose?: boolean;
-    glyphCssClass?: string;
-    weight?: number; // higher weight will override lower weight when on same line
-    proto: { new(): MonacoFieldEditor };
-    heightInPixels?: number;
-}
-
-export interface MonacoFindArguments {
-    searchString: string;
-    isRegex: boolean;
-    matchWholeWord: boolean;
-    matchCase: boolean;
-    validateRange?: (range: monaco.Range, model: monaco.editor.ITextModel) => monaco.Range;
-}
 
-const definitions: pxt.Map<MonacoFieldEditorDefinition> = {};
+const definitions: pxt.Map<pxt.editor.MonacoFieldEditorDefinition> = {};
 
-export function registerMonacoFieldEditor(name: string, definition: MonacoFieldEditorDefinition) {
+export function registerMonacoFieldEditor(name: string, definition: pxt.editor.MonacoFieldEditorDefinition) {
     definitions[name] = definition;
 }
 
diff --git a/webapp/src/cmds.ts b/webapp/src/cmds.ts
index 273c714b031b..c2c8c95421f7 100644
--- a/webapp/src/cmds.ts
+++ b/webapp/src/cmds.ts
@@ -13,6 +13,7 @@ import * as pxtblockly from "../../pxtblocks";
 import ExtensionResult = pxt.editor.ExtensionResult;
 import NativeHostMessage = pxt.editor.NativeHostMessage;
 import { setEditorExtensionExperiments } from "../../pxteditor/experiments";
+import { registerMonacoFieldEditor } from "../../pxteditor";
 
 
 function log(msg: string) {
@@ -401,6 +402,11 @@ function applyExtensionResult() {
     if (res.experiments) {
         setEditorExtensionExperiments(res.experiments);
     }
+    if (res.monacoFieldEditors) {
+        for (const def of res.monacoFieldEditors) {
+            registerMonacoFieldEditor(def.id, def);
+        }
+    }
 }
 
 export async function initAsync() {
diff --git a/webapp/src/monaco.tsx b/webapp/src/monaco.tsx
index 01177842f525..1db2e5f10040 100644
--- a/webapp/src/monaco.tsx
+++ b/webapp/src/monaco.tsx
@@ -1606,7 +1606,7 @@ export class Editor extends toolboxeditor.ToolboxEditor {
         }
     }
 
-    showFieldEditor(range: monaco.Range, fe: pxteditor.MonacoFieldEditor, viewZoneHeight: number, buildAfter: boolean) {
+    showFieldEditor(range: monaco.Range, fe: pxt.editor.MonacoFieldEditor, viewZoneHeight: number, buildAfter: boolean) {
         if (this.feWidget) {
             this.feWidget.close();
         }
diff --git a/webapp/src/monacoFieldEditorHost.ts b/webapp/src/monacoFieldEditorHost.ts
index ec38bda8ccd5..21e26787efec 100644
--- a/webapp/src/monacoFieldEditorHost.ts
+++ b/webapp/src/monacoFieldEditorHost.ts
@@ -1,6 +1,5 @@
 /// <reference path="../../localtypings/monaco.d.ts" />
 
-import { MonacoFieldEditor, MonacoFieldEditorDefinition, MonacoFieldEditorHost, TextEdit } from "../../pxteditor";
 import * as compiler from "./compiler";
 import * as pkg from "./package";
 
@@ -11,7 +10,7 @@ interface OwnedRange {
     id: number;
 }
 
-export class ViewZoneEditorHost implements MonacoFieldEditorHost, monaco.editor.IViewZone {
+export class ViewZoneEditorHost implements pxt.editor.MonacoFieldEditorHost, monaco.editor.IViewZone {
     domNode: HTMLDivElement;
     afterLineNumber: number;
     heightInPx = 520;
@@ -26,7 +25,7 @@ export class ViewZoneEditorHost implements MonacoFieldEditorHost, monaco.editor.
 
     suppressMouseDown = false;
 
-    constructor(protected fe: MonacoFieldEditor, protected range: monaco.Range, protected model: monaco.editor.IModel) {
+    constructor(protected fe: pxt.editor.MonacoFieldEditor, protected range: monaco.Range, protected model: monaco.editor.IModel) {
         this.afterLineNumber = range.endLineNumber;
 
         const outer = document.createElement("div");
@@ -52,7 +51,7 @@ export class ViewZoneEditorHost implements MonacoFieldEditorHost, monaco.editor.
         return this.content;
     }
 
-    showAsync(fileType: pxt.editor.FileType, editor: monaco.editor.IStandaloneCodeEditor): Promise<TextEdit> {
+    showAsync(fileType: pxt.editor.FileType, editor: monaco.editor.IStandaloneCodeEditor): Promise<pxt.editor.TextEdit> {
         this.fileType = fileType;
         this.editor = editor;
         return compiler.getBlocksAsync()
@@ -132,10 +131,10 @@ export class ViewZoneEditorHost implements MonacoFieldEditorHost, monaco.editor.
     }
 }
 
-export class ModalEditorHost implements MonacoFieldEditorHost {
+export class ModalEditorHost implements pxt.editor.MonacoFieldEditorHost {
     protected blocks: pxtc.BlocksInfo;
 
-    constructor(protected fe: MonacoFieldEditor, protected range: monaco.Range, protected model: monaco.editor.IModel) {
+    constructor(protected fe: pxt.editor.MonacoFieldEditor, protected range: monaco.Range, protected model: monaco.editor.IModel) {
     }
 
     contentDiv(): HTMLDivElement {
@@ -164,7 +163,7 @@ export class ModalEditorHost implements MonacoFieldEditorHost {
         return this.package().host().readFile(pkg.mainPkg, filename);
     }
 
-    showAsync(fileType: pxt.editor.FileType, editor: monaco.editor.IStandaloneCodeEditor): Promise<TextEdit> {
+    showAsync(fileType: pxt.editor.FileType, editor: monaco.editor.IStandaloneCodeEditor): Promise<pxt.editor.TextEdit> {
         return compiler.getBlocksAsync()
             .then(bi => {
                 this.blocks = bi;
@@ -179,7 +178,7 @@ export class ModalEditorHost implements MonacoFieldEditorHost {
 }
 
 export class FieldEditorManager implements monaco.languages.FoldingRangeProvider {
-    protected fieldEditors: MonacoFieldEditorDefinition[] = [];
+    protected fieldEditors: pxt.editor.MonacoFieldEditorDefinition[] = [];
     protected decorations: pxt.Map<string[]> = {};
     protected liveRanges: OwnedRange[] = [];
     protected fieldEditorsEnabled = true;
@@ -213,7 +212,7 @@ export class FieldEditorManager implements monaco.languages.FoldingRangeProvider
         }
     }
 
-    addFieldEditor(definition: MonacoFieldEditorDefinition) {
+    addFieldEditor(definition: pxt.editor.MonacoFieldEditorDefinition) {
         for (const f of this.fieldEditors) {
             if (f.id === definition.id) return;
         }