fix: Resolve TypeScript errors

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

client/node_modules/levelup/lib/batch.js

@@ -0,0 +1,80 @@
+var WriteError = require('level-errors').WriteError
+var promisify = require('./promisify')
+var getCallback = require('./common').getCallback
+var getOptions = require('./common').getOptions
+
+function Batch (levelup) {
+  // TODO (next major): remove this._levelup alias
+  this.db = this._levelup = levelup
+  this.batch = levelup.db.batch()
+  this.ops = []
+  this.length = 0
+}
+
+Batch.prototype.put = function (key, value) {
+  try {
+    this.batch.put(key, value)
+  } catch (e) {
+    throw new WriteError(e)
+  }
+
+  this.ops.push({ type: 'put', key: key, value: value })
+  this.length++
+
+  return this
+}
+
+Batch.prototype.del = function (key) {
+  try {
+    this.batch.del(key)
+  } catch (err) {
+    throw new WriteError(err)
+  }
+
+  this.ops.push({ type: 'del', key: key })
+  this.length++
+
+  return this
+}
+
+Batch.prototype.clear = function () {
+  try {
+    this.batch.clear()
+  } catch (err) {
+    throw new WriteError(err)
+  }
+
+  this.ops = []
+  this.length = 0
+
+  return this
+}
+
+Batch.prototype.write = function (options, callback) {
+  var levelup = this._levelup
+  var ops = this.ops
+  var promise
+
+  callback = getCallback(options, callback)
+
+  if (!callback) {
+    callback = promisify()
+    promise = callback.promise
+  }
+
+  options = getOptions(options)
+
+  try {
+    this.batch.write(options, function (err) {
+      if (err) { return callback(new WriteError(err)) }
+      levelup.emit('batch', ops)
+      callback()
+    })
+  } catch (err) {
+    throw new WriteError(err)
+  }
+
+  return promise
+}
+
+module.exports = Batch