diff --git a/test-native.sh b/test-native.sh
index 1a43677..8f040a1 100755
--- a/test-native.sh
+++ b/test-native.sh
@@ -209,7 +209,21 @@ grep -F 'fiveaxisKinematicsType: options.fiveaxisKinematicsType' web/src/wasm-co
 grep -F 'fiveaxis_kinematics_type: options.fiveaxis_kinematics_type' web/src/wasm-core.js >/dev/null
 grep -F 'xyzbcTrt: options.xyzbcTrt' web/src/wasm-core.js >/dev/null
 grep -F 'globalThis.createCncSimModule' web/src/wasm-core.js >/dev/null
-grep -F 'createModule(moduleOptions)' web/src/wasm-core.js >/dev/null
+grep -F 'const hasOpfsOptions = Object.prototype.hasOwnProperty.call(moduleOptions, "opfs");' web/src/wasm-core.js >/dev/null
+grep -F 'const emscriptenModuleOptions = hasOpfsOptions' web/src/wasm-core.js >/dev/null
+grep -F '? (({ opfs: _opfs, ...rest }) => rest)(moduleOptions)' web/src/wasm-core.js >/dev/null
+grep -F 'const module = hasOpfsOptions ? await createModule(emscriptenModuleOptions) : await createModule(moduleOptions);' web/src/wasm-core.js >/dev/null
+grep -F 'const opfs = installOpfsWorkspace(module, moduleOptions);' web/src/wasm-core.js >/dev/null
+if ! awk '
+    index($0, "const hasOpfsOptions = Object.prototype.hasOwnProperty.call(moduleOptions, \"opfs\");") { has_line = NR }
+    index($0, "const emscriptenModuleOptions = hasOpfsOptions") { stripped_line = NR }
+    index($0, "await createModule(emscriptenModuleOptions)") { create_line = NR }
+    index($0, "const opfs = installOpfsWorkspace(module, moduleOptions);") { opfs_line = NR }
+    END { exit !(has_line && stripped_line && create_line && opfs_line && has_line < stripped_line && stripped_line < create_line && create_line < opfs_line) }
+' web/src/wasm-core.js; then
+    echo "wasm-core must strip OPFS options before creating the Emscripten module and install OPFS from the original options" >&2
+    exit 1
+fi
 grep -F 'async parseFile(path, dialect = "linuxcnc", options = {})' web/src/wasm-core.js >/dev/null
 grep -F 'async parseWithParameterFile(program, parameterPath, dialect = "linuxcnc", options = {})' web/src/wasm-core.js >/dev/null
 grep -F 'async parseFileWithParameterFile(path, parameterPath, dialect = "linuxcnc", options = {})' web/src/wasm-core.js >/dev/null