如何为Vapor添加新依赖？出现unknown package 'Web3'错误如何解决？

你在Package.swift的dependencies节点引入的Web3仓库实际包名为Web3.swift，但在target的依赖配置中，引用产品时填的包名是Web3，二者不匹配导致Swift Package Manager无法识别到对应包，触发报错。

1. 打开项目的Package.swift文件
2. 找到App target的dependencies配置段，将3个Web3相关依赖的package参数值从Web3替换为Web3.swift，修改后对应配置如下：

.target(
    name: "App",
    dependencies: [
        .product(name: "Fluent", package: "fluent"),
        .product(name: "FluentPostgresDriver", package: "fluent-postgres-driver"),
        .product(name: "Vapor", package: "vapor"),
        .product(name: "JWT", package: "jwt"),
        .product(name: "Web3", package: "Web3.swift"),
        .product(name: "Web3PromiseKit", package: "Web3.swift"),
        .product(name: "Web3ContractABI", package: "Web3.swift")
    ],
    swiftSettings: [
        .unsafeFlags(["-cross-module-optimization"], .when(configuration: .release))
    ]
)

3. 保存文件后执行swift package resolve重新加载依赖，即可解决报错。

内容的提问来源于stack exchange，提问作者Андрей Новиков