The part that I don't get is Lists packages required for developing this package, or running tests, etc. from Composer Official Docs.

我没有得到的部分是列出开发这个包或运行测试等所需的包。

youdao

All candles must contain at least 50% palm oil. Palm oil Certification is required for all candles and must be sent with shipping docs. "7."

全部蜡烛必须包含至少50%棕榈油棕榈油证明是全部蜡烛所必需的，并且用装运文件寄给。

youdao