Method loadNodeMiddleware

packages/next/src/server/next-server.ts:1547–1580

()

  }

  private async loadNodeMiddleware() {
    if (!process.env.NEXT_MINIMAL) {
      try {
        const functionsConfig = this.dev
          ? {}
          : require(
              join(
                /* turbopackIgnore: true */ this.distDir,
                'server',
                FUNCTIONS_CONFIG_MANIFEST
              )
            )

        if (this.dev || functionsConfig?.functions?.['/_middleware']) {
          // if used with top level await, this will be a promise
          return require(
            join(
              /* turbopackIgnore: true */ this.distDir,
              'server',
              'middleware.js'
            )
          )
        }
      } catch (err) {
        if (
          isError(err) &&
          err.code !== 'ENOENT' &&
          err.code !== 'MODULE_NOT_FOUND'
        ) {
          throw err
        }
      }
    }
  }

  /**
   * Checks if a middleware exists. This method is useful for the development