`eslint-plugin-mushi-mushi`

Two lint rules that run as part of the v2 gates — no-dead-handler flags empty event handlers (onClick={() => {}}, onSubmit={noop}) and no-mock-leak flags faker / placeholder data left in production paths. The composite GitHub check fails when either rule reports.

Install


pnpm add -D eslint-plugin-mushi-mushi

Recommended preset

Most projects pick up both rules at their default severity by extending the recommended preset:

eslint.config.js


import mushi from 'eslint-plugin-mushi-mushi'
 
export default [
  // …your other configs
  {
    plugins: { 'mushi-mushi': mushi },
    rules: {
      ...mushi.configs.recommended.rules,
    },
  },
]

For legacy .eslintrc:


{
  "plugins": ["mushi-mushi"],
  "extends": ["plugin:mushi-mushi/recommended"]
}

Rules

`mushi-mushi/no-dead-handler`

Flags JSX event handlers whose body is empty, only logs, or is a no-op arrow (() => {}). The CI gate fails on any non-test file that matches.


// ✗ caught
<button onClick={() => {}}>Submit</button>
<button onSubmit={noop}>Submit</button>
 
// ✓ allowed
<button onClick={() => mutate()}>Submit</button>
<button onSubmit={handleSubmit}>Submit</button>
 
// ✓ allowed in tests + stories
<button onClick={() => {}} />        // foo.test.tsx, *.stories.tsx

`mushi-mushi/no-mock-leak`

Flags arrays of placeholder data (John Doe, lorem ipsum, faker.*, @faker-js/faker) that live outside **/*test*, **/*stories*, **/__mocks__/**, or **/fixtures/**. The intent is to catch the moment a developer leaves their seed data wired up in a real page.


// ✗ caught — apps/web/src/pages/Dashboard.tsx
const projects = [
  { name: 'John Doe', tasks: 12 },
  { name: 'Jane Doe', tasks: 7 },
]
 
// ✓ allowed — apps/web/src/__mocks__/projects.ts
export const projects = [
  { name: 'John Doe', tasks: 12 },
]

Combining with the gates action

Both rules surface as part of @mushi-mushi/mcp-ci’s composite GitHub check. You can also run the rules locally (pnpm lint) and fix violations before pushing — the action will pick the same set back up in CI.