data-lake: Allow passing initial value on variable creation

Listeners are not notified about this initial value. This allows those creating variables to have an initial value that is based on its internal logic (e.g.: persistency between sessions).

src/libs/actions/data-lake.ts

@@ -20,7 +20,7 @@ class CockpitActionVariable {
 }
 
 const cockpitActionVariableInfo: Record<string, CockpitActionVariable> = {}
-export const cockpitActionVariableData: Record<string, string | number | boolean> = {}
+export const cockpitActionVariableData: Record<string, string | number | boolean | undefined> = {}
 const cockpitActionVariableListeners: Record<string, ((value: string | number | boolean) => void)[]> = {}
 
 export const getAllCockpitActionVariablesInfo = (): Record<string, CockpitActionVariable> => {
@@ -31,11 +31,15 @@ export const getCockpitActionVariableInfo = (id: string): CockpitActionVariable
   return cockpitActionVariableInfo[id]
 }
 
-export const createCockpitActionVariable = (variable: CockpitActionVariable): void => {
+export const createCockpitActionVariable = (
+  variable: CockpitActionVariable,
+  initialValue?: string | number | boolean
+): void => {
   if (cockpitActionVariableInfo[variable.id]) {
     throw new Error(`Cockpit action variable with id '${variable.id}' already exists. Update it instead.`)
   }
   cockpitActionVariableInfo[variable.id] = variable
+  cockpitActionVariableData[variable.id] = initialValue
 }
 
 export const updateCockpitActionVariableInfo = (variable: CockpitActionVariable): void => {
@@ -73,6 +77,7 @@ export const unlistenCockpitActionVariable = (id: string): void => {
 const notifyCockpitActionVariableListeners = (id: string): void => {
   if (cockpitActionVariableListeners[id]) {
     const value = cockpitActionVariableData[id]
+    if (value === undefined) return
     cockpitActionVariableListeners[id].forEach((listener) => listener(value))
   }
 }