diff --git a/Plugins/PackageToJS/Templates/runtime.mjs b/Plugins/PackageToJS/Templates/runtime.mjs
index fe16a65e..66a2e0ad 100644
--- a/Plugins/PackageToJS/Templates/runtime.mjs
+++ b/Plugins/PackageToJS/Templates/runtime.mjs
@@ -308,7 +308,12 @@ class SwiftRuntime {
// Cache the DataView as it's not a cheap operation
let cachedDataView = new DataView(wasmMemory.buffer);
let cachedUint8Array = new Uint8Array(wasmMemory.buffer);
- if (typeof SharedArrayBuffer !== "undefined" && wasmMemory.buffer instanceof SharedArrayBuffer) {
+ // Check the constructor name of the buffer to determine if it's backed by a SharedArrayBuffer.
+ // We can't reference SharedArrayBuffer directly here because:
+ // 1. It may not be available in the global scope if the context is not cross-origin isolated.
+ // 2. The underlying buffer may be still backed by SAB even if the context is not cross-origin
+ // isolated (e.g. localhost on Chrome on Android).
+ if (Object.getPrototypeOf(wasmMemory.buffer).constructor.name === "SharedArrayBuffer") {
// When the wasm memory is backed by a SharedArrayBuffer, growing the memory
// doesn't invalidate the data view by setting the byte length to 0. Instead,
// the data view points to an old buffer after growing the memory. So we have
@@ -796,8 +801,9 @@ class SwiftRuntime {
throw new Error("threadChannel is not set in options given to SwiftRuntime. Please set it to request transferring objects.");
}
const broker = getMessageBroker(this.options.threadChannel);
- const sendingObjects = decodeObjectRefs(sending_objects, sending_objects_count, this.getDataView());
- const transferringObjects = decodeObjectRefs(transferring_objects, transferring_objects_count, this.getDataView());
+ const dataView = this.getDataView();
+ const sendingObjects = decodeObjectRefs(sending_objects, sending_objects_count, dataView);
+ const transferringObjects = decodeObjectRefs(transferring_objects, transferring_objects_count, dataView);
broker.request({
type: "request",
data: {
diff --git a/Runtime/src/index.ts b/Runtime/src/index.ts
index 77cc2451..199db33d 100644
--- a/Runtime/src/index.ts
+++ b/Runtime/src/index.ts
@@ -64,7 +64,13 @@ export class SwiftRuntime {
// Cache the DataView as it's not a cheap operation
let cachedDataView = new DataView(wasmMemory.buffer);
let cachedUint8Array = new Uint8Array(wasmMemory.buffer);
- if (typeof SharedArrayBuffer !== "undefined" && wasmMemory.buffer instanceof SharedArrayBuffer) {
+
+ // Check the constructor name of the buffer to determine if it's backed by a SharedArrayBuffer.
+ // We can't reference SharedArrayBuffer directly here because:
+ // 1. It may not be available in the global scope if the context is not cross-origin isolated.
+ // 2. The underlying buffer may be still backed by SAB even if the context is not cross-origin
+ // isolated (e.g. localhost on Chrome on Android).
+ if (Object.getPrototypeOf(wasmMemory.buffer).constructor.name === "SharedArrayBuffer") {
// When the wasm memory is backed by a SharedArrayBuffer, growing the memory
// doesn't invalidate the data view by setting the byte length to 0. Instead,
// the data view points to an old buffer after growing the memory. So we have
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