add core method to saveState and getState.

packages/core/__tests__/lib.test.ts

@@ -17,7 +17,10 @@ const testEnvVars = {
   INPUT_MY_INPUT: 'val',
   INPUT_MISSING: '',
   'INPUT_SPECIAL_CHARS_\'\t"\\': '\'\t"\\ response ',
-  INPUT_MULTIPLE_SPACES_VARIABLE: 'I have multiple spaces'
+  INPUT_MULTIPLE_SPACES_VARIABLE: 'I have multiple spaces',
+
+  // Save inputs
+  STATE_state_1: 'state_val'
 }
 
 describe('@actions/core', () => {
@@ -194,6 +197,15 @@ describe('@actions/core', () => {
     core.debug('\r\ndebug\n')
     assertWriteCalls([`::debug::%0D%0Adebug%0A${os.EOL}`])
   })
+
+  it('saveState produces the correct command', () => {
+    core.saveState('state_1', 'some value')
+    assertWriteCalls([`::save-state name=state_1,::some value${os.EOL}`])
+  })
+
+  it('getState gets wrapper action state', () => {
+    expect(core.getState('state_1')).toBe('state_val')
+  })
 })
 
 // Assert that process.stdout.write calls called only with the given arguments.

packages/core/src/core.ts

@@ -178,3 +178,27 @@ export async function group<T>(name: string, fn: () => Promise<T>): Promise<T> {
 
   return result
 }
+
+//-----------------------------------------------------------------------
+// Wrapper action state
+//-----------------------------------------------------------------------
+
+/**
+ * Saves state for current action, the state can only be retrieved by this action's post job execution.
+ *
+ * @param     name     name of the state to store
+ * @param     value    value to store
+ */
+export function saveState(name: string, value: string): void {
+  issueCommand('save-state', { name }, value)
+}
+
+/**
+ * Gets the value of an state set by this action's main execution.
+ *
+ * @param     name     name of the state to get
+ * @returns   string
+ */
+export function getState(name: string): string {
+  return process.env[`STATE_${name}`] || ''
+}