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PiperOrigin-RevId: 565755048

mediapipe/web/graph_runner/BUILD

@@ -60,6 +60,7 @@ mediapipe_ts_library(
         ":graph_runner_factory_api",
         ":listener_types",
         ":platform_utils",
+        ":run_script_helper",
         ":wasm_module_private",
     ],
 )
@@ -98,6 +99,18 @@ mediapipe_ts_library(
     deps = [":platform_utils"],
 )
 
+genrule(
+    name = "run_script_genrule",
+    srcs = ["run_script_helper.ts.template"],
+    outs = ["run_script_helper.ts"],
+    cmd = "cp $< $@",
+)
+
+mediapipe_ts_library(
+    name = "run_script_helper",
+    srcs = ["run_script_helper.ts"],
+)
+
 jasmine_node_test(
     name = "platform_utils_test",
     deps = [

mediapipe/web/graph_runner/graph_runner.ts

@@ -1,6 +1,6 @@
 // Placeholder for internal dependency on assertTruthy
-// Placeholder for internal dependency on jsloader
 import {isWebKit} from '../../web/graph_runner/platform_utils';
+import {runScript} from '../../web/graph_runner/run_script_helper';
 // Placeholder for internal dependency on trusted resource url
 
 import {GraphRunnerApi, ImageSource} from './graph_runner_api';
@@ -717,26 +717,6 @@ export class GraphRunner implements GraphRunnerApi {
   }
 }
 
-// Quick private helper to run the given script safely
-async function runScript(scriptUrl: string|string) {
-  if (typeof importScripts === 'function') {
-    importScripts(scriptUrl.toString());
-  } else {
-    const script = document.createElement('script');
-    script.setAttribute('src', scriptUrl);
-    script.setAttribute('crossorigin', 'anonymous');
-    return new Promise<void>((resolve) => {
-      script.addEventListener('load', () => {
-        resolve();
-      }, false);
-      script.addEventListener('error', () => {
-        resolve();
-      }, false);
-      document.body.appendChild(script);
-    });
-  }
-}
-
 /** {@override CreateMediaPipeLibApi} */
 export const createMediaPipeLib: CreateMediaPipeLibApi = async<LibType>(
     constructorFcn: WasmMediaPipeConstructor<LibType>,

mediapipe/web/graph_runner/run_script_helper.ts.template

@@ -0,0 +1,28 @@
+// Placeholder for internal dependency on jsloader
+// Placeholder for internal dependency on trusted resource url
+
+/**
+ * Fetches each URL in urls, executes them one-by-one in the order they are
+ * passed, and then returns (or throws if something went amiss).
+ */
+declare function importScripts(...urls: Array<string|URL>): void;
+
+// Quick helper to run the given script safely
+export async function runScript(scriptUrl: string) {
+  if (typeof importScripts === 'function') {
+    importScripts(scriptUrl.toString());
+  } else {
+    const script = document.createElement('script');
+    script.setAttribute('src', scriptUrl);
+    script.setAttribute('crossorigin', 'anonymous');
+    return new Promise<void>((resolve, revoke) => {
+      script.addEventListener('load', () => {
+        resolve();
+      }, false);
+      script.addEventListener('error', e => {
+        revoke(e);
+      }, false);
+      document.body.appendChild(script);
+    });
+  }
+}