feat(itk-wasm): add pthreadSupportAvailable

Author: thewtex

packages/core/typescript/itk-wasm/src/pipeline/index-common.ts

@@ -1,3 +1,5 @@
+export { default as pthreadSupportAvailable } from './pthread-support-available.js'
+
 export type { default as ItkWasmEmscriptenModule } from './itk-wasm-emscripten-module.js'
 
 export type { default as PipelineInput } from './pipeline-input.js'

packages/core/typescript/itk-wasm/src/pipeline/index.ts

@@ -1,4 +1,4 @@
-// itk-wasm Browser pipeline functions
+// ITK-Wasm Browser pipeline functions
 
 export { default as runPipeline } from './run-pipeline.js'
 export { default as createWebWorker } from './create-web-worker.js'

packages/core/typescript/itk-wasm/src/pipeline/pthread-support-available.ts

@@ -0,0 +1,25 @@
+function pthreadSupportAvailable(): boolean {
+  const haveSharedArrayBuffer =
+    typeof globalThis.SharedArrayBuffer === 'function'
+
+  // Emscripten ENVIRONMENT_IS_NODE
+  const isNode =
+    typeof process == 'object' &&
+    typeof process.versions == 'object' &&
+    typeof process.versions.node == 'string' &&
+    // @ts-ignore: ts(2339)
+    process.type != 'renderer'
+
+  const isCrossOriginIsolated =
+    typeof crossOriginIsolated !== 'undefined'
+      ? crossOriginIsolated
+      : globalThis.crossOriginIsolated || false
+
+  if (isNode) {
+    return haveSharedArrayBuffer
+  }
+
+  return haveSharedArrayBuffer && isCrossOriginIsolated
+}
+
+export default pthreadSupportAvailable

packages/core/typescript/itk-wasm/test/node/pipeline/pthread-support-available-test.js

@@ -0,0 +1,7 @@
+import test from 'ava'
+
+import { pthreadSupportAvailable } from '../../../dist/index-node.js'
+
+test('node pthread support available', (t) => {
+  t.truthy(pthreadSupportAvailable())
+})