Function has

packages/vite/src/node/server/mixedModuleGraph.ts:553–561

(key)

      return this.keys()
    },
    has(key) {
      if (!key.id) {
        return false
      }
      const keyModule = moduleGraph
        ._getModuleGraph(module.environment)
        .getModuleById(key.id)
      return keyModule !== undefined && module[prop].has(keyModule)
    },
    values() {
      return this.keys()
    },