markFixedExport = name => {
        for (const importTo of topLevelExported[name]) {
          fixedExportMap[importTo] = [name];
        }
        return hOnceId;
      }
Adds an exported name to the module static record private metadata,
indicating that it is updated fixed, either because it is a constant
or because it is initialized and never reassigned.

This method gets called in the transform phase.
The returned hidden variable name may be used to transform
a declaration, particularly for an export class statement.

@param {string} name - the local name of the exported variable.