PostHog · adboio · Jul 20, 2026
diff --git a/packages/core/src/canvas/canvasTemplates.ts b/packages/core/src/canvas/canvasTemplates.ts
diff --git a/packages/core/src/canvas/canvasTemplatesService.ts b/packages/core/src/canvas/canvasTemplatesService.ts
@@ -1,9 +1,6 @@
+import { freeformSystemPromptFor } from "@posthog/shared/canvas-freeform-prompt";
 import { injectable } from "inversify";
-import {
-  BUILT_IN_TEMPLATES,
-  type CanvasTemplate,
-  freeformSystemPromptFor,
-} from "./canvasTemplates";
+import { BUILT_IN_TEMPLATES, type CanvasTemplate } from "./canvasTemplates";
 import type { ICanvasTemplatesService } from "./services";
 import type { CanvasTemplateSummary } from "./templateSchemas";
 

diff --git a/packages/core/src/canvas/dashboardsService.ts b/packages/core/src/canvas/dashboardsService.ts
@@ -1,5 +1,6 @@
 import type { AuthService } from "@posthog/core/auth/auth";
 import { AUTH_SERVICE } from "@posthog/core/auth/auth.module";
+import { FREEFORM_TEMPLATE_ID } from "@posthog/shared/canvas-freeform-prompt";
 import { inject, injectable } from "inversify";
 import type {
   DashboardFileMeta,
@@ -11,7 +12,7 @@ import {
   type DesktopFsClient,
   type FsEntryBase,
 } from "./desktopFsClient";
-import { FREEFORM_TEMPLATE_ID, type FreeformVersion } from "./freeformSchemas";
+import type { FreeformVersion } from "./freeformSchemas";
 import { fetchCurrentUser } from "./posthogApi";
 
 // Desktop file-system "type" tag for a dashboard entry. Channels are `folder`

diff --git a/packages/core/src/canvas/freeformSchemas.ts b/packages/core/src/canvas/freeformSchemas.ts
@@ -2,7 +2,6 @@ import { z } from "zod";
 
 // The template id for freeform-React canvases. Stored on a canvas's meta so the
 // generation path can resolve the right system prompt.
-export const FREEFORM_TEMPLATE_ID = "freeform";
 
 // A single point in a freeform canvas's edit history. Every agent turn appends
 // one full-file snapshot (Q7: full-file rewrite); the user can revert to any of

diff --git a/packages/shared/package.json b/packages/shared/package.json
@@ -8,6 +8,18 @@
       "types": "./dist/index.d.ts",
       "import": "./dist/index.js"
     },
+    "./canvas-freeform-prompt": {
+      "types": "./dist/canvas-freeform-prompt.d.ts",
+      "import": "./dist/canvas-freeform-prompt.js"
+    },
+    "./canvas-freeform-whitelist": {
+      "types": "./dist/canvas-freeform-whitelist.d.ts",
+      "import": "./dist/canvas-freeform-whitelist.js"
+    },
+    "./canvas-freeform-starter": {
+      "types": "./dist/canvas-freeform-starter.d.ts",
+      "import": "./dist/canvas-freeform-starter.js"
+    },
     "./analytics-events": {
       "types": "./dist/analytics-events.d.ts",
       "import": "./dist/analytics-events.js"

diff --git a/packages/shared/src/canvas-freeform-prompt.ts b/packages/shared/src/canvas-freeform-prompt.ts
diff --git a/packages/core/src/canvas/freeformStarter.ts → ...ges/shared/src/canvas-freeform-starter.ts b/packages/core/src/canvas/freeformStarter.ts → ...ges/shared/src/canvas-freeform-starter.ts
diff --git a/...core/src/canvas/freeformWhitelist.test.ts → ...red/src/canvas-freeform-whitelist.test.ts b/...core/src/canvas/freeformWhitelist.test.ts → ...red/src/canvas-freeform-whitelist.test.ts
@@ -3,7 +3,7 @@ import {
   buildImportMap,
   checkFreeformImports,
   FREEFORM_WHITELIST,
-} from "./freeformWhitelist";
+} from "./canvas-freeform-whitelist";
 
 describe("checkFreeformImports", () => {
   it("accepts whitelisted imports", () => {

diff --git a/...ages/core/src/canvas/freeformWhitelist.ts → ...s/shared/src/canvas-freeform-whitelist.ts b/...ages/core/src/canvas/freeformWhitelist.ts → ...s/shared/src/canvas-freeform-whitelist.ts
diff --git a/packages/shared/tsup.config.ts b/packages/shared/tsup.config.ts
@@ -5,6 +5,9 @@ export default defineConfig({
     "src/index.ts",
     "src/agent-platform-types.ts",
     "src/analytics-events.ts",
+    "src/canvas-freeform-prompt.ts",
+    "src/canvas-freeform-starter.ts",
+    "src/canvas-freeform-whitelist.ts",
     "src/constants.ts",
     "src/deeplink.ts",
     "src/dismissalReasons.ts",

diff --git a/packages/ui/src/features/canvas/components/canvasTemplateIcon.tsx b/packages/ui/src/features/canvas/components/canvasTemplateIcon.tsx
@@ -4,7 +4,7 @@ import {
   FileIcon,
   ShapesIcon,
 } from "@phosphor-icons/react";
-import { FREEFORM_TEMPLATE_ID } from "@posthog/core/canvas/freeformSchemas";
+import { FREEFORM_TEMPLATE_ID } from "@posthog/shared/canvas-freeform-prompt";
 import type { ReactNode } from "react";
 
 // A canvas's leading icon, chosen from its template so the tree and header read

diff --git a/packages/ui/src/features/canvas/freeform/sandboxRuntime.ts b/packages/ui/src/features/canvas/freeform/sandboxRuntime.ts
@@ -4,7 +4,7 @@ import {
   FREEFORM_ESM_HOST,
   FREEFORM_POSTHOG_JS_URL,
   FREEFORM_QUILL_CSS_URLS,
-} from "@posthog/core/canvas/freeformWhitelist";
+} from "@posthog/shared/canvas-freeform-whitelist";
 
 // Builds the HTML document loaded into the freeform-canvas sandbox iframe.
 //

diff --git a/packages/ui/src/features/canvas/freeformPrompt.ts b/packages/ui/src/features/canvas/freeformPrompt.ts
@@ -1,5 +1,5 @@
-import { freeformSystemPromptFor } from "@posthog/core/canvas/canvasTemplates";
-import { FREEFORM_STARTER_CODE } from "@posthog/core/canvas/freeformStarter";
+import { freeformSystemPromptFor } from "@posthog/shared/canvas-freeform-prompt";
+import { FREEFORM_STARTER_CODE } from "@posthog/shared/canvas-freeform-starter";
 
 // Builds the prompt for the task that generates a freeform (React) canvas. Like
 // CONTEXT.md generation, this runs as a normal repo-less agent task (no repo