SBT libraryDependencySchemes配置问题：ScalaJS依赖冲突未解决

问题重现 #

遇到依赖冲突错误，仅ScalaJS端受影响，JVM端正常：

[error] (server / update) found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[error] 
[error]     * com.lihaoyi:geny_2.13:1.0.0 (early-semver) is selected over 0.6.10
[error]         +- com.lihaoyi:scalatags_2.13:0.12.0                  (depends on 1.0.0)
[error]         +- com.lihaoyi:fastparse_2.13:2.3.3                   (depends on 0.6.10)
[error] 
[error] 
[error] this can be overridden using libraryDependencySchemes or evictionErrorLevel

尝试使用libraryDependencySchemes配置VersionScheme.Always但未解决，试过以下两种无效写法：

libraryDependencySchemes += "com.lihaoyi" %% "geny" % VersionScheme.Always
libraryDependencySchemes += "com.lihaoyi" %%% "geny" % VersionScheme.Always

项目是跨平台多子项目结构，核心配置如下：

lazy val xplatform = crossProject(JSPlatform, JVMPlatform)
  .crossType(CrossType.Full)
  .in(file("_xplatform"))
  .settings(commonSettings)
  .settings(
    libraryDependencySchemes += "com.lihaoyi" %% "geny" % VersionScheme.Always, // 无效写法
    libraryDependencies ++= Seq(
      "com.lihaoyi"       %%% "fastparse"       % "2.3.3",
      "com.lihaoyi"       %%% "scalatags"       % "0.12.0",
      // 其他省略依赖
    ),
    jsEnv := new org.scalajs.jsenv.jsdomnodejs.JSDOMNodeJSEnv()
  )
  .jsSettings(
    libraryDependencies ++= Seq(
      "ca.bwbecker"  %%% "jsFacadeOptionBuilder" % "0.9.6"
    ),
    jsDependencies += "org.webjars" % "jquery" % "3.4.1" / "jquery.js" % "test"
  )
  .jsConfigure(_.enablePlugins(ScalaJSWeb, JSDependenciesPlugin))

问题原因 #

libraryDependencySchemes的语法和libraryDependencies不同：

• %%/%%%是libraryDependencies特有的语法，用于自动追加Scala版本或ScalaJS平台后缀
• libraryDependencySchemes需要使用原始模块ID（仅组织名+模块名，不带版本后缀或平台标识），因此不能用%%或%%%

解决方案 #

方法1：修正libraryDependencySchemes语法 #

将配置改为不带平台/Scala版本后缀的格式，可直接在crossProject的settings中配置：

lazy val xplatform = crossProject(JSPlatform, JVMPlatform)
  .crossType(CrossType.Full)
  .in(file("_xplatform"))
  .settings(commonSettings)
  .settings(
    // 正确写法：使用%而非%%/%%%
    libraryDependencySchemes += "com.lihaoyi" % "geny" % VersionScheme.Always,
    libraryDependencies ++= Seq(
      "com.lihaoyi"       %%% "fastparse"       % "2.3.3",
      "com.lihaoyi"       %%% "scalatags"       % "0.12.0",
      // 其他省略依赖
    ),
    jsEnv := new org.scalajs.jsenv.jsdomnodejs.JSDOMNodeJSEnv()
  )
  // 其他配置...

方法2：针对ScalaJS子项目单独配置 #

如果全局配置仍不生效，可在jsSettings中单独添加该规则：

.jsSettings(
  libraryDependencySchemes += "com.lihaoyi" % "geny" % VersionScheme.Always,
  libraryDependencies ++= Seq(
    "ca.bwbecker"  %%% "jsFacadeOptionBuilder" % "0.9.6"
  ),
  jsDependencies += "org.webjars" % "jquery" % "3.4.1" / "jquery.js" % "test"
)

方法3：临时降级冲突级别（不推荐长期使用） #

若上述方法仍无效，可将依赖冲突的错误级别改为警告，暂时跳过检查：

.settings(
  evictionErrorLevel := Level.Warn,
  // 其他配置...
)

内容的提问来源于stack exchange，提问作者bwbecker