New hasGlobalResource step

And make hasGlobalVar step NonCPS.

vars/hasGlobalResource.groovy

@@ -0,0 +1,41 @@
+/*
+   Copyright 2014-2022 Sam Gleske - https://github.com/samrocketman/jervis
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+   */
+/**
+  hasGlobalResource will check to see if a file exists in the resources
+  directory of any shared library.  This will allow for conditional
+  libraryResource steps.  Skip attempting to load the resource if it doesn't
+  exist.
+  */
+import hudson.model.Run
+import org.jenkinsci.plugins.workflow.libs.LibrariesAction
+import org.jenkinsci.plugins.workflow.libs.LibraryRecord
+
+/**
+  Check if a global library provides a resource.
+ */
+@NonCPS
+Boolean lookForGlobalLibraryResource(Run run, String resourceFile) {
+  def action = run.getAction(LibrariesAction)
+  action.libraries.any { LibraryRecord library ->
+    File file = new File(run.getRootDir(), "libs/${library.name}/resources/${resourceFile}")
+    file.exists()
+  }
+}
+
+@NonCPS
+Boolean call(String resourceFile) {
+    lookForGlobalLibraryResource(currentBuild.rawBuild, resourceFile)
+}

vars/hasGlobalVar.groovy

@@ -15,7 +15,7 @@
    */
 /**
   hasGlobalVar will check to see if a global variable exists which is possible
-  loaded by anotehr pipeline library.  This is useful for optionally detecting
+  loaded by another pipeline library.  This is useful for optionally detecting
   and calling variables provided by other pipelines.  It gives a means of
   gracefully falling back if the variables provided by other pipelines are not
   loaded or do not exist.
@@ -29,10 +29,11 @@ import org.jenkinsci.plugins.workflow.libs.LibraryAdder
   functionality provided by other global libraries (only if they are defined).
  */
 @NonCPS
-boolean hasGlobalVar(String var) {
+Boolean hasGlobalVar(String var) {
     var in  ExtensionList.lookup(LibraryAdder.GlobalVars.class)[0].forRun(currentBuild.rawBuild)*.name
 }
 
-def call(String var) {
+@NonCPS
+Boolean call(String var) {
     hasGlobalVar(var)
 }