add dynamic import

Author: bee344

package.json

@@ -51,7 +51,7 @@
     "test:test-release": "yarn build:scripts && node scripts/build/runYarnPack.js"
   },
   "dependencies": {
-    "@polkadot-api/merkleize-metadata": "^1.1.21",
+    "@polkadot-api/merkleize-metadata": "^1.1.29",
     "@polkadot/api": "16.5.2",
     "@polkadot/api-augment": "16.5.2",
     "@polkadot/api-contract": "16.5.2",

src/services/transaction/TransactionMetadataBlobService.ts

@@ -18,13 +18,31 @@ import { ApiPromise } from '@polkadot/api';
 import { ApiDecoration } from '@polkadot/api/types';
 import type { BlockHash } from '@polkadot/types/interfaces';
 import { u8aToHex } from '@polkadot/util';
-import { merkleizeMetadata } from '@polkadot-api/merkleize-metadata';
 import { BadRequest, InternalServerError } from 'http-errors';
 import { ITransactionMetadataBlob } from 'src/types/responses';
 
 import { MetadataBlobParams } from '../../controllers/transaction/TransactionMetadataBlobController';
 import { AbstractService } from '../AbstractService';
 
+// Dynamic import helper that TypeScript won't transform to require()
+// This is necessary because @polkadot-api/merkleize-metadata is an ESM-only package
+// eslint-disable-next-line @typescript-eslint/no-implied-eval
+const dynamicImport = new Function('specifier', 'return import(specifier)') as <T>(specifier: string) => Promise<T>;
+
+// Cached module after first load
+let merkleizeMetadataModule: typeof import('@polkadot-api/merkleize-metadata') | null = null;
+
+async function getMerkleizeMetadata(): Promise<
+	(typeof import('@polkadot-api/merkleize-metadata'))['merkleizeMetadata']
+> {
+	if (!merkleizeMetadataModule) {
+		merkleizeMetadataModule = await dynamicImport<typeof import('@polkadot-api/merkleize-metadata')>(
+			'@polkadot-api/merkleize-metadata',
+		);
+	}
+	return merkleizeMetadataModule.merkleizeMetadata;
+}
+
 export class TransactionMetadataBlobService extends AbstractService {
 	/**
 	 * Fetch metadata blob (proof) for a given transaction.
@@ -87,6 +105,8 @@ export class TransactionMetadataBlobService extends AbstractService {
 
 		const base58Prefix = ss58Format?.toNumber() ?? 42;
 
+		// Use dynamic import for ESM module compatibility
+		const merkleizeMetadata = await getMerkleizeMetadata();
 		const merkleized = merkleizeMetadata(metadataV15Raw, {
 			decimals,
 			tokenSymbol,

yarn.lock

@@ -1464,7 +1464,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@polkadot-api/merkleize-metadata@npm:^1.1.21":
+"@polkadot-api/merkleize-metadata@npm:^1.1.29":
   version: 1.1.29
   resolution: "@polkadot-api/merkleize-metadata@npm:1.1.29"
   dependencies:
@@ -2498,7 +2498,7 @@ __metadata:
   resolution: "@substrate/api-sidecar@workspace:."
   dependencies:
     "@acala-network/chopsticks-testing": "npm:^1.2.5"
-    "@polkadot-api/merkleize-metadata": "npm:^1.1.21"
+    "@polkadot-api/merkleize-metadata": "npm:^1.1.29"
     "@polkadot/api": "npm:16.5.2"
     "@polkadot/api-augment": "npm:16.5.2"
     "@polkadot/api-contract": "npm:16.5.2"