build: async()

in packages/metro/src/Server.js [717:776]
55 lines of code
5 McCabe index (conditional complexity)

    build: async ({
      entryFile,
      graphId,
      graphOptions,
      onProgress,
      serializerOptions,
      transformOptions,
    }) => {
      const revPromise = this._bundler.getRevisionByGraphId(graphId);

      const {delta, revision} = await (revPromise != null
        ? this._bundler.updateGraph(await revPromise, false)
        : this._bundler.initializeGraph(entryFile, transformOptions, {
            onProgress,
            shallow: graphOptions.shallow,
          }));

      const serializer =
        this._config.serializer.customSerializer ||
        ((...args) => bundleToString(baseJSBundle(...args)).code);

      const bundle = await serializer(
        entryFile,
        revision.prepend,
        revision.graph,
        {
          asyncRequireModulePath: await this._resolveRelativePath(
            this._config.transformer.asyncRequireModulePath,
            {transformOptions, relativeTo: 'project'},
          ),
          processModuleFilter: this._config.serializer.processModuleFilter,
          createModuleId: this._createModuleId,
          getRunModuleStatement: this._config.serializer.getRunModuleStatement,
          dev: transformOptions.dev,
          projectRoot: this._config.projectRoot,
          modulesOnly: serializerOptions.modulesOnly,
          runBeforeMainModule:
            this._config.serializer.getModulesRunBeforeMainModule(
              path.relative(this._config.projectRoot, entryFile),
            ),
          runModule: serializerOptions.runModule,
          sourceMapUrl: serializerOptions.sourceMapUrl,
          sourceUrl: serializerOptions.sourceUrl,
          inlineSourceMap: serializerOptions.inlineSourceMap,
          serverRoot:
            this._config.server.unstable_serverRoot ?? this._config.projectRoot,
        },
      );

      const bundleCode = typeof bundle === 'string' ? bundle : bundle.code;

      return {
        numModifiedFiles: delta.reset
          ? delta.added.size + revision.prepend.length
          : delta.added.size + delta.modified.size + delta.deleted.size,
        lastModifiedDate: revision.date,
        nextRevId: revision.id,
        bundle: bundleCode,
      };
    },