Add support for R8-based minization - #2077
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Goooler
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Jul 3, 2026
Allows using ShadowJar without Java plugin
Goooler
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Jul 4, 2026
Goooler
enabled auto-merge (squash)
July 4, 2026 08:08
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Thanks a lot for this! Supported auto-updates for R8 in #2080. |
Goooler
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Jul 23, 2026
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| /** Additional ProGuard/R8 keep rules. */ | ||
| @get:Input public val keepRules: ListProperty<String> | ||
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| /** Files containing additional ProGuard/R8 keep rules. */ | ||
| @get:InputFiles | ||
| @get:PathSensitive(PathSensitivity.RELATIVE) | ||
| public val keepRuleFiles: ConfigurableFileCollection |
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They should be renamed to proguardRules and proguardRuleFiles.
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Jul 24, 2026
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| /** Use R8 to minimize the shadowed JAR and configure its options. */ | ||
| public fun r8(action: Action<in R8Spec>) |
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After days of consideration, I would prefer there to be a separate r8 block in ShadowJar, so that we can use minimize with r8 separately.
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This was attempted once or twice in the past on this project before the move, but attempted again here. This adds support for R8-based minimization, which is much more thorough and configurable than the default unused shrinker. This also allows for extra configuration to optimize, obfuscate, etc.
Full usage docs are in the README additions here. The default behavior is purely just tree-shaking. This also allows for the addition of other tools in the future too.
Disclosure: I did use AI to move through some of the boilerplate here, but manually de-fluffed and cleaned things up after too. Much of it was based on my use of R8 manually in another project here: https://github.com/ZacSweers/MoshiX/blob/main/moshi-ir/moshi-kotlin-tests/build.gradle.kts#L18