sbt-eviction-rules

An sbt plugin enhancing the evicted key.

This plugin:

makes the output of evicted slightly more readable
allows to easily run eviction checks on your CI
allows to more easily configure evictions that can be ignored.

How to use

Add to project/plugins.sbt:

addSbtPlugin("io.github.alexarchambault.sbt" % "sbt-eviction-rules" % "0.1.0")

The latest version is .

Better output

`evictionWarnings`

evictionWarnings prints only problematic evictions:

> evictionWarnings
[warn] Found eviction warnings in b:
[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn]
[warn] 	* org.scala-lang.modules:scala-xml_2.12:1.2.0 is selected over {1.0.6, 1.0.6}
[warn] 	    +- eu.timepit:refined_2.12:0.9.12                     (depends on 1.2.0)
[warn] ct    +- org.scala-lang:scala-compiler:2.12.11              (depends on 1.0.6)
[warn] Found eviction warnings in a:
[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn]
[warn] 	* org.scala-lang.modules:scala-xml_2.12:1.2.0 is selected over {1.0.6, 1.0.6}
[warn] 	    +- eu.timepit:refined_2.12:0.9.12                     (depends on 1.2.0)
[warn] 	    +- org.scala-lang:scala-compiler:2.12.11              (depends on 1.0.6)
[success] Total time: 1 s, completed jun 4 2020 16:05:22

`evicted`

evicted prints which of your projects each printed eviction comes from:

> evicted
[warn] Found eviction warnings in b:
[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn]
[warn] 	* org.scala-lang.modules:scala-xml_2.12:1.2.0 is selected over {1.0.6, 1.0.6}
[warn] 	    +- eu.timepit:refined_2.12:0.9.12                     (depends on 1.2.0)
[warn] ct    +- org.scala-lang:scala-compiler:2.12.11              (depends on 1.0.6)
[warn] Found eviction warnings in a:
[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn]
[warn] 	* org.scala-lang.modules:scala-xml_2.12:1.2.0 is selected over {1.0.6, 1.0.6}
[warn] 	    +- eu.timepit:refined_2.12:0.9.12                     (depends on 1.2.0)
[warn] 	    +- org.scala-lang:scala-compiler:2.12.11              (depends on 1.0.6)
[info] Found non problematic eviction(s) in c:
[info] Here are other dependency conflicts that were resolved:
[info]
[info] 	* org.scala-lang.modules:scala-xml_2.12:1.2.0 is selected over {1.0.6, 1.0.6}
[info] 	    +- eu.timepit:refined_2.12:0.9.12                     (depends on 1.2.0)
[info] 	    +- org.scala-lang:scala-compiler:2.12.11              (depends on 1.0.6)
[success] Total time: 1 s, completed jun 4 2020 15:54:04

Check the absence of problematic evictions

evictionCheck checks that there are no problematic evictions, and fails if there are such evictions. This can be handy to run eviction checks on your CI.

Easier to configure

If an eviction is printed as problematic, you can configure evictions to loosen its checks with evictionRules, like

evictionRules += "org.scala-lang.modules" %% "scala-xml" % "semver"

This specifies that "org.scala-lang.modules" %% "scala-xml" follows semantic versioning, so that it's fine if version 1.2.0 is selected where 1.0.6 is expected.

The following compatibility types are available:

semver: assumes the matched modules follow semantic versioning,
pvp: assumes the matched modules follow package versioning policy (quite common in Scala),
always: assumes all versions of the matched modules are compatible with each other,
strict: requires exact matches between the wanted and the selected versions of the matched modules.

Module patterns

evictionRules accepts * as organization or module name, or as parts of them, to match several modules at once:

evictionRules += "io.get-coursier" %% "*" % "pvp"
evictionRules += "org.typelevel" %% "cats-*" % "semver"

About the default eviction rules in sbt

By default, sbt assumes that

scala dependencies follow the package versioning policy,
other dependencies follow semantic versioning.

If any eviction brings an incompatible version per those defaults, sbt warns about it in update and gives more details in evicted.

sbt-eviction-rules then allows to ignore the warnings that you think can be safely ignored.

Note that there can be slight discrepancies between the checks performed by evictionRules and those performed by default by sbt: the checks done by evictionRules are handled by the coursier versions library, while those of sbt are handled by the sbt/librarymanagement library.

Acknowledgments

sbt-eviction-rules is funded by the Scala Center.

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