fix: Resolve TypeScript errors

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

client/node_modules/level-codec/UPGRADING.md

@@ -0,0 +1,35 @@
+# Upgrade Guide
+
+This document describes breaking changes and how to upgrade. For a complete list of changes including minor and patch releases, please refer to the [changelog](CHANGELOG.md).
+
+## v9
+
+Dropped node 0.12, 4, 5 and 7.
+
+## v8
+
+Previously the "utf8" decoder always returned a string. This was a workaround for `encoding-down` that is no longer needed. The return type now depends on the `asBuffer` option, which is more optimal.
+
+## v7
+
+Dropped node 0.10 and iojs.
+
+## v6
+
+The `createDecodeStream()` method (introduced in the last 5.x version) has been replaced with `createStreamDecoder()`.
+
+## v5
+
+This is a rewrite of both internals and the public API. Please see the README for details.
+
+## v4
+
+Removed default encoding ("utf8"). If you relied on this behavior you must now define it yourself.
+
+## v3
+
+Removed the `encoding` option in favor of `keyEncoding` and `valueEncoding`. Note: it was partially restored in v6.1.0.
+
+## v2
+
+The function signature of `batch()` has changed from `batch(ops, batchOptions, dbOptions)` to `batch(ops, optionObjects)`.