BlogPost7_batchJsInterop.js

const cachedFunctions = {}

function batchJsInterop(calls) {
  return calls.map(call => {
    try {
      // Find function if needed
      if (!(call.identifier in cachedFunctions)) {
        var result = window;
        var lastSegment = null;

        call.identifier.split('.').forEach(seg => {
          lastSegment = result;
          result = result[seg];
        });

        result.bind(lastSegment);
        cachedFunctions[call.identifier] = result;
      }
      
      // Invoke
      let args = call.args ? call.args : [];
      return {
        success: true,
        returnValue: cachedFunctions[call.identifier].apply(null, args)
      };
    } catch (e) {
      return {
        success: false,
        error: e.message
      }
    }
  });
}