dynamic imports

Author: bee344

jest.config.js

@@ -16,5 +16,7 @@ module.exports = {
 	maxWorkers: '50%',
 	testPathIgnorePatterns: ['/build/', '/node_modules/', '/docs/', '/e2e-tests/'],
 	// The below resolves `jest-haste-map: Haste module naming collision: @substrate/api-sidecar`
-	modulePathIgnorePatterns: ['/build']
+	modulePathIgnorePatterns: ['/build'],
+	// Transform ESM modules from @polkadot-api, @noble, and @scure packages
+	transformIgnorePatterns: ['/node_modules/(?!(@polkadot-api|@noble|@scure)/)'],
 };

package.json

@@ -91,8 +91,5 @@
     "polkadot",
     "kusama"
   ],
-  "packageManager": "[email protected]",
-  "resolutions": {
-    "@scure/base": "^1.2.6"
-  }
+  "packageManager": "[email protected]"
 }

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

@@ -2403,13 +2403,20 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@scure/base@npm:^1.2.6":
+"@scure/base@npm:^1.1.1, @scure/base@npm:^1.1.7, @scure/base@npm:^1.2.6":
   version: 1.2.6
   resolution: "@scure/base@npm:1.2.6"
   checksum: 10/c1a7bd5e0b0c8f94c36fbc220f4a67cc832b00e2d2065c7d8a404ed81ab1c94c5443def6d361a70fc382db3496e9487fb9941728f0584782b274c18a4bed4187
   languageName: node
   linkType: hard
 
+"@scure/base@npm:^2.0.0":
+  version: 2.0.0
+  resolution: "@scure/base@npm:2.0.0"
+  checksum: 10/8fb86024f22e9c532d513b8df8a672252e58bd5695920ce646162287f0accd38e89cab58722a738b3d247b5dcf7760362ae2d82d502be7e62a555f5d98f8a110
+  languageName: node
+  linkType: hard
+
 "@scure/sr25519@npm:^0.2.0":
   version: 0.2.0
   resolution: "@scure/sr25519@npm:0.2.0"