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core-util/src/main/java/org/signal/core/util/StringExtensions.kt

@@ -1,5 +1,8 @@
 package org.signal.core.util
 
+import kotlin.contracts.ExperimentalContracts
+import kotlin.contracts.contract
+
 /**
  * Treats the string as a serialized list of tokens and tells you if an item is present in the list.
  * In addition to exact matches, this handles wildcards at the end of an item.
@@ -55,6 +58,10 @@ fun String?.nullIfBlank(): String? {
   }
 }
 
+@OptIn(ExperimentalContracts::class)
 fun CharSequence?.isNotNullOrBlank(): Boolean {
+  contract {
+    returns(true) implies (this@isNotNullOrBlank != null)
+  }
   return !this.isNullOrBlank()
 }