Add script to retrieve local meta/rpc/version (#5471)

* Add script to retrieve local meta/rpc/version

* Filter _unknown_

* Cleanup

* Additional

scripts/metadata-get.mjs

@@ -0,0 +1,51 @@
+// Copyright 2017-2023 @polkadot/typegen authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import fs from 'fs';
+
+import { fetch } from '@polkadot/x-fetch';
+
+const META = 14;
+const PREAMBLE = `// Copyright 2017-2023 @polkadot/types-support authors & contributors\n// SPDX-License-Identifier: Apache-2.0\n\n/* eslint-disable */\n\n`;
+const CMD = {
+  kusama: `${PREAMBLE}// cargo run --release -- purge-chain -y --chain kusama-dev  && cargo run --release -- --chain kusama-dev --alice --force-authoring\n\nexport default`,
+  polkadot: `${PREAMBLE}// cargo run --release -- purge-chain -y --dev  && cargo run --release -- --dev\n\nexport default`,
+  substrate: `${PREAMBLE}// cargo run --release -- purge-chain -y --dev  && cargo run --release -- --dev\n\nexport default`
+}
+
+let requestId = 0;
+
+async function get (method) {
+  const res = await fetch('http://127.0.0.1:9933', {
+    body: JSON.stringify({
+      id: ++requestId,
+      jsonrpc: '2.0',
+      method,
+      params: []
+    }),
+    headers: {
+      'Accept': 'application/json',
+      'Content-Type': 'application/json'
+    },
+    method: 'post'
+  });
+  const body = await res.json();
+
+  return body.result;
+}
+
+const [methods, metadata, version] = await Promise.all([
+  get('rpc_methods'),
+  get('state_getMetadata'),
+  get('state_getRuntimeVersion')
+]);
+const chain = version.specName === 'node'
+  ? 'substrate'
+  : version.specName;
+const path = `packages/types-support/src/metadata/v${META}/${chain}`;
+
+fs.writeFileSync(`${path}-hex.ts`, `${CMD[chain]} '${metadata}';\n`);
+fs.writeFileSync(`${path}-rpc.ts`, `${CMD[chain]} ${JSON.stringify(methods, null, 2)};\n`);
+fs.writeFileSync(`${path}-ver.ts`, `${CMD[chain]} ${JSON.stringify(version, null, 2)};\n`);
+
+console.log(`Done. ${chain}/${version.specVersion}`);