Bug :: SDK core import with NextJS

[Valazan]

When importing the SDK Core in a NextJs project 14.1.1, when trying to build, I get the following error:

Type error: Type 'IterableIterator' can only be iterated through when using the '--downlevelIteration' flag or with a '--target' of 'es2015' or higher.

150 | const nBits = nBytes * 8; 151 |

152 | for (const hash of this.hashes.keys()) { | ^ 153 | distribute(hash, k, nBits, (index, bit) => { 154 | bits[index] |= bit; 155 | return true; error Command failed with exit code 1.

[lucanicoladebiasi]

Diagnosis

The origin of the problem is Map type exposes keys through the type IterableIterator<number>, introduced with ES2015 or higher.

The error message"Type error: Type 'IterableIterator' can only be iterated through when using the '--downlevelIteration' flag or with a '--target' of 'es2015' or higher." suggests the solution, albeit incomplete.

Therapy

The tsconfig.json file of the NextJS module must includes in the "compilerOptions" both

• "target": "es2020"
• "types": ["@testing-library/jest-dom"]

The "target": "es2020" is required because the SDK uses BigInt type not available before.

Omitting "types": ["@testing-library/jest-dom"] prevents "target": "es2020" to be evaluated.

Once yarn install and yarn build succeed, the types are cached in

• apps/sdk-nextjs-integration/.next
• apps/sdk-nextjs-integration/node_modules
• apps/sdk-nextjs-integration/next-env.d.ts those directories and files must be deleted before new compilerOptions are effective.