ESLint Fix Patterns

How to resolve specific ESLint errors in this project.

no-void

Don't use the void operator in event listener functions. Instead, make the function async and await the promise.

// BAD
const handleClickNavigate = () => {
  void navigate('/path');
};

// GOOD
const handleClickNavigate = async () => {
  await navigate('/path');
};

canonical/export-specifier-newline vs prettier conflict

Use inline export const declarations instead of a grouped export { ... } statement to avoid circular fix warnings between these two rules.

// BAD, causes circular fix between prettier and canonical
export {DAYS, DURATIONS, FITNESS_GOALS};

// GOOD, declare with export directly
export const DAYS = ['mon', 'tue'] as const;
export const DURATIONS = [15, 30, 45] as const;
export const FITNESS_GOALS = ['weight_loss'] as const;

no-shadow trailing underscores

ESLint's no-shadow autofixes by appending _. Once shadowing is resolved, remove the trailing _.

sonarjs/deprecation

Never suppress with eslint-disable. Always fix the underlying deprecation.

Common case: Zod v4 deprecated z.string().email() in favor of z.email().

// BAD, suppressing the warning
// eslint-disable-next-line sonarjs/deprecation
email: z.string().email(),

// GOOD, use the non-deprecated API
email: z.email(),

you-dont-need-lodash-underscore/\*

Use native JavaScript instead of lodash/underscore equivalents.

// BAD
import _ from 'lodash';
const first = _.find(items, (item) => item.active);
const names = _.map(items, (item) => item.name);

// GOOD
const first = items.find((item) => item.active);
const names = items.map((item) => item.name);

testing-library/prefer-screen-queries

Use screen queries instead of destructuring from render().

// BAD
const {getByText, getByRole} = render(<MyComponent />);

// GOOD
render(<MyComponent />);
screen.getByText('...');
screen.getByRole('button');

testing-library/await-async-events

userEvent methods are async, always await them.

// BAD
userEvent.click(button);

// GOOD
await userEvent.click(button);

jest-dom/prefer-\*

Use jest-dom matchers instead of raw DOM property checks.

// BAD
expect(input.value).toBe('hello');
expect(checkbox.checked).toBe(true);
expect(el.textContent).toBe('Hello');

// GOOD
expect(input).toHaveValue('hello');
expect(checkbox).toBeChecked();
expect(el).toHaveTextContent('Hello');