Check for unused function arguments (#6583)

* eslint: Check for unused function arguments

* eslint: Ignore unused '_' in argument list

Also allow any number of '_' e.g., '__' or '___' which is to be used sparingly

* Remove and rename unused arguments

1 files changed, 1 insertions, 1 deletions

diff --git a/test/unit/migrations/migrator-test.js b/test/unit/migrations/migrator-test.js
index a9374dff1..693c5830d 100644
--- a/test/unit/migrations/migrator-test.js
+++ b/test/unit/migrations/migrator-test.js
@@ -61,7 +61,7 @@ describe('Migrator', () => {
     const migrator = new Migrator({ migrations: [{ version: 1, migrate: async () => { throw new Error('test') } } ] })
     migrator.on('error', () => done())
     migrator.migrateData({ meta: {version: 0} })
-    .then((migratedData) => {
+    .then(() => {
     }).catch(done)
   })