plugin.js

if (process.env.QUALIA_PROFILE_FOLDER) {
  var fs          = Npm.require('fs'),
      path        = Npm.require('path'),
      outputPath  = path.resolve(process.env.QUALIA_PROFILE_FOLDER),
      mainModule  = global.process.mainModule,
      absPath     = mainModule.filename.split(path.sep).slice(0, -1).join(path.sep),
      require     = function(filePath) {
        return mainModule.require(path.resolve(absPath, filePath));
      },
      AppRunner   = require('./runners/run-app.js').AppRunner,
      Bundler     = require('./isobuild/bundler.js'),
      v8Profiler  = Npm.require('v8-profiler-next'),
      Profiler    = getProfiler(v8Profiler, fs)
  ;

  if (!AppRunner._patched) {
    AppRunner._patched = true;

    var oldMakePromise = AppRunner.prototype._makePromise;
    AppRunner.prototype._makePromise = function(name) {
      if (name === 'run') {
        Profiler.stopProfile('client-rebuild');
      }
      return oldMakePromise.apply(this, arguments);
    };

    var oldResolvePromise = AppRunner.prototype._resolvePromise;
    AppRunner.prototype._resolvePromise = function(name, value) {
      let outcome = value ? value.outcome : '';

      if (name === 'run' && outcome === 'changed') {
        Profiler.startProfile('full-rebuild', {
          exportPath: path.join(outputPath, 'full-rebuild.cpuprofile'),
        });
      }
      if (name === 'run' && outcome === 'changed-refreshable') {
        Profiler.startProfile('client-rebuild', {
          exportPath: path.join(outputPath, 'client-rebuild.cpuprofile'),
        });
      }
      else if (name === 'start') {
        Profiler.stopProfile('initial-build');
        Profiler.stopProfile('full-rebuild');
      }

      return oldResolvePromise.apply(this, arguments);
    };

    Bundler._mainJsContents = [
      "process.argv.splice(2, 0, 'program.json');",
      "process.chdir(require('path').join(__dirname, 'programs', 'server'));",
      "",
      "var npmRequire = require('./programs/server/npm-require.js').require;",
      "var profilerPath = '/node_modules/meteor/qualia:profile/node_modules/v8-profiler-next';",
      "var v8Profiler = npmRequire(profilerPath);",
      "var fs = require('fs');",
      'var Profiler = eval(`(' + getProfiler.toString() + ')`)(v8Profiler, fs);',
      "Profiler.startProfile('startup', { exportPath: '" + path.join(outputPath, 'startup.cpuprofile') + "' });",
      "",
      "require('./programs/server/boot.js');",
      "",
      "var intervalID = setInterval(() => {",
      "  if (__meteor_bootstrap__.startupHooks) return;",
      "  clearInterval(intervalID);",
      "  Profiler.stopProfile('startup');",
      "}, 100);",
    ].join("\n");

    Profiler.startProfile('initial-build', {
      exportPath: path.join(outputPath, 'initial-build.cpuprofile'),
    });
  }
}