Add 'cache-hit' as output

__tests__/cache-restore.test.ts

@@ -140,6 +140,7 @@ describe('cache-restore', () => {
         expect(infoSpy).not.toHaveBeenCalledWith(
           `${packageManager} cache is not found`
         );
+        expect(setOutputSpy).toHaveBeenCalledWith('cache-hit', true);
       }
     );
   });
@@ -167,6 +168,7 @@ describe('cache-restore', () => {
         expect(infoSpy).toHaveBeenCalledWith(
           `${packageManager} cache is not found`
         );
+        expect(setOutputSpy).toHaveBeenCalledWith('cache-hit', false);
       }
     );
   });

action.yml

@@ -29,6 +29,9 @@ inputs:
   version:
     description: 'Deprecated. Use node-version instead. Will not be supported after October 1, 2019'
     deprecationMessage: 'The version property will not be supported after October 1, 2019. Use node-version instead'
+outputs:
+  cache-hit: 
+    description: 'A boolean value to indicate if a cache was hit'
 runs:
   using: 'node12'
   main: 'dist/setup/index.js'

dist/setup/index.js

@@ -44674,6 +44674,7 @@ exports.restoreCache = (packageManager, cacheDependencyPath) => __awaiter(void 0
     core.debug(`primary key is ${primaryKey}`);
     core.saveState(constants_1.State.CachePrimaryKey, primaryKey);
     const cacheKey = yield cache.restoreCache([cachePath], primaryKey);
+    core.setOutput('cache-hit', Boolean(cacheKey));
     if (!cacheKey) {
         core.info(`${packageManager} cache is not found`);
         return;

src/cache-restore.ts

@@ -42,6 +42,7 @@ export const restoreCache = async (
   core.saveState(State.CachePrimaryKey, primaryKey);
 
   const cacheKey = await cache.restoreCache([cachePath], primaryKey);
+  core.setOutput('cache-hit', Boolean(cacheKey));
 
   if (!cacheKey) {
     core.info(`${packageManager} cache is not found`);