[Typescript Conversion: Level 21]: Convert ui/helpers/utils/util.js to typescript

@MajorLift is already working on this.

Since Apr 10, 2025.

## **Description**

Convert `ui/helpers/utils/util.js` from JavaScript to TypeScript as part of the TS migration initiative.

## **Scenario (for user stories only)**

_(Not applicable)_

## **Design (for user stories only)**

_(Not applicable)_

## **Technical Details (for technical tasks only)**

- Convert this file to TypeScript.
- Migration Level: **21**
- Dependencies:
- shared/constants/labels.ts
- shared/constants/network.ts
- shared/modules/conversion.utils.ts
- shared/modules/hexstring-utils.ts
- shared/modules/string-utils.ts
- ui/helpers/constants/common.ts
- ui/helpers/constants/routes.ts
- Dependents:
- app/scripts/platforms/extension.js
- ui/components/app/alerts/unconnected-account-alert/unconnected-account-alert.js
- ui/components/app/connected-accounts-list/connected-accounts-list-item/connected-accounts-list-item.component.js
- ui/components/app/connected-accounts-permissions/connected-accounts-permissions.js
- ui/components/app/detected-token/detected-token-address/detected-token-address.js
- ui/components/app/modals/confirm-remove-account/confirm-remove-account.component.js
- ui/components/app/modals/qr-scanner/qr-scanner.component.js
- ui/components/app/permission-page-container/permission-page-container-content/permission-page-container-content.component.js
- ui/components/app/permission-page-container/permission-page-container.component.js
- ui/components/app/permissions-connect-permission-list/permissions-connect-permission-list.js
- ui/components/app/selected-account/selected-account.component.js
- ui/components/app/srp-input/srp-input.js
- ui/components/app/transaction-activity-log/transaction-activity-log.component.js
- ui/components/app/transaction-list-item-details/transaction-list-item-details.component.js
- ui/components/app/transaction-list-item/smart-transaction-list-item.component.js
- ui/components/app/transaction-list-item/transaction-list-item.component.js
- ui/components/app/transaction-list/transaction-list.component.js
- ui/components/ui/identicon/identicon.component.js
- ui/components/ui/nickname-popover/nickname-popover.component.js
- ui/components/ui/sender-to-recipient/sender-to-recipient.component.js
- ui/ducks/send/helpers.js
- ui/ducks/send/send.js
- ui/helpers/utils/gas.js
- ui/helpers/utils/permission.js
- ui/helpers/utils/token-util.js
- ui/helpers/utils/tx-helper.ts
- ui/hooks/useTransactionDisplayData.js
- ui/hooks/useTransactionDisplayData.test.js
- ui/pages/asset/components/native-asset.tsx
- ui/pages/asset/components/token-asset.tsx
- ui/pages/connected-accounts/connected-accounts.component.js
- ui/pages/connected-accounts/connected-accounts.container.js
- ui/pages/create-account/connect-hardware/account-list.js
- ui/pages/create-account/connect-hardware/index.js
- ui/pages/home/home.container.js
- ui/pages/permissions-connect/permissions-connect.container.js
- ui/pages/settings/contact-list-tab/add-contact/add-contact.component.js
- ui/pages/settings/settings.container.js
- ui/pages/swaps/searchable-item-list/item-list/item-list.component.js
- ui/pages/swaps/view-on-block-explorer/view-on-block-explorer.js
- ui/selectors/selectors.js

## **[Threat Modeling Framework](https://github.com/adamshostack/4QuestionFrame) (for technical tasks only)**

- What are we working on? Convert file to TypeScript.
- What can go wrong? Type errors, integration mismatches, missing types.
- What are we going to do about it? Write types carefully and test thoroughly.
- Did we do a good job? _(To be evaluated)_

## **Acceptance Criteria**

- File is fully converted to TypeScript.
- Tests pass.
- File adheres to linting rules.
- Functionality remains unchanged.

## **Stakeholder Review (for MetaMask employees only)**

- [X] Engineering
- [ ] Design
- [ ] Product
- [ ] QA
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management
- [ ] Other

## **References**

- Parent issue: #31460