fix: Resolve TypeScript errors

Signed-off-by: Hermes Agent <hermes@nosuchhost>

client/node_modules/abstract-leveldown/test/iterator-no-snapshot-test.js

@@ -0,0 +1,72 @@
+var collectEntries = require('level-concat-iterator')
+
+exports.setUp = function (test, testCommon) {
+  test('setUp common', testCommon.setUp)
+}
+
+exports.noSnapshot = function (test, testCommon) {
+  function make (run) {
+    return function (t) {
+      var db = testCommon.factory()
+      var operations = [
+        { type: 'put', key: 'a', value: 'a' },
+        { type: 'put', key: 'b', value: 'b' },
+        { type: 'put', key: 'c', value: 'c' }
+      ]
+
+      db.open(function (err) {
+        t.ifError(err, 'no open error')
+
+        db.batch(operations, function (err) {
+          t.ifError(err, 'no batch error')
+
+          // For this test it is important that we don't read eagerly.
+          // NOTE: highWaterMark is not an abstract option atm, but
+          // it is supported by leveldown, rocksdb and others.
+          var it = db.iterator({ highWaterMark: 0 })
+
+          run(db, function (err) {
+            t.ifError(err, 'no run error')
+            verify(t, it, db)
+          })
+        })
+      })
+    }
+  }
+
+  function verify (t, it, db) {
+    collectEntries(it, function (err, entries) {
+      t.ifError(err, 'no iterator error')
+
+      var kv = entries.map(function (entry) {
+        return entry.key.toString() + entry.value.toString()
+      })
+
+      if (kv.length === 3) {
+        t.same(kv, ['aa', 'bb', 'cc'], 'maybe supports snapshots')
+      } else {
+        t.same(kv, ['aa', 'cc'], 'ignores keys that have been deleted in the mean time')
+      }
+
+      db.close(t.end.bind(t))
+    })
+  }
+
+  test('delete key after creating iterator', make(function (db, done) {
+    db.del('b', done)
+  }))
+
+  test('batch delete key after creating iterator', make(function (db, done) {
+    db.batch([{ type: 'del', key: 'b' }], done)
+  }))
+}
+
+exports.tearDown = function (test, testCommon) {
+  test('tearDown', testCommon.tearDown)
+}
+
+exports.all = function (test, testCommon) {
+  exports.setUp(test, testCommon)
+  exports.noSnapshot(test, testCommon)
+  exports.tearDown(test, testCommon)
+}