Preparing better lockFileContents for Pyodide 0.28.1

Author: WebReflection

esm/interpreter/pyodide.js

@@ -99,17 +99,19 @@ export default {
                 // packages are uniquely stored as JSON key
                 const key = stringify(packages);
                 if (storage.has(key)) {
-                    const blob = new Blob(
-                        [storage.get(key)],
-                        { type: 'application/json' },
-                    );
-                    // this should be used to bootstrap loadPyodide
-                    options.lockFileURL = URL.createObjectURL(blob);
-                    // versions are not currently understood by pyodide when
-                    // a lockFileURL is used instead of micropip.install(packages)
-                    // https://github.com/pyodide/pyodide/issues/5135#issuecomment-2441038644
-                    // https://github.com/pyscript/pyscript/issues/2245
-                    options.packages = packages.map(name => name.split(/[>=<]=/)[0]);
+                    const value = storage.get(key);
+                    if (save && !version.startsWith('0.27'))
+                        options.lockFileContents = Promise.resolve(value);
+                    else {
+                        const blob = new Blob([value], { type: 'application/json' });
+                        // this should be used to bootstrap loadPyodide
+                        options.lockFileURL = URL.createObjectURL(blob);
+                        // versions are not currently understood by pyodide when
+                        // a lockFileURL is used instead of micropip.install(packages)
+                        // https://github.com/pyodide/pyodide/issues/5135#issuecomment-2441038644
+                        // https://github.com/pyscript/pyscript/issues/2245
+                        options.packages = packages.map(name => name.split(/[>=<]=/)[0]);
+                    }
                     packages = null;
                 }
             }