third_party/protobuf/3.4.0/js/node_loader.js

// Protocol Buffers - Google's data interchange format
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/**
 * @fileoverview Loader that handles goog.require() for Node.JS.
 */

var oldLoader = goog.global.CLOSURE_IMPORT_SCRIPT;

goog.global.CLOSURE_IMPORT_SCRIPT = function(src, opt_sourceText) {
  if (opt_sourceText === undefined) {
    try {
      // Load from the current directory.
      require("./" + src);
      return true;
    } catch (e) {
      // Fall back to the Closure loader.
    }
  }

  return oldLoader(src, opt_sourceText);
};