grafana/style_guides/frontend.md

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# Frontend Style Guide
Generally we follow the Airbnb [React Style Guide](https://github.com/airbnb/javascript/tree/master/react).
## Table of Contents
1. [Basic Rules](#basic-rules)
1. [File & Component Organization](#Organization)
1. [Naming](#naming)
1. [Declaration](#declaration)
1. [Props](#props)
1. [Refs](#refs)
1. [Methods](#methods)
1. [Ordering](#ordering)
## Basic rules
* Try to keep files small and focused and break large components up into sub components.
## Organization
* Components and types that needs to be used by external plugins needs to go into @grafana/ui
* Components should get their own folder under features/xxx/components
* Sub components can live in that component folders, so not small component needs their own folder
* Place test next to their component file (same dir)
* Mocks in __mocks__ dir
* Test utils in __tests__ dir
* Component sass should live in the same folder as component code
* State logic & domain models should live in features/xxx/state
* Containers (pages) can live in feature root features/xxx
* up for debate?
## Props
* Name callback props & handlers with a "on" prefix.
```tsx
// good
onChange = () => {
};
render() {
return (
<MyComponent onChange={this.onChange} />
);
}
// bad
handleChange = () => {
};
render() {
return (
<MyComponent changed={this.handleChange} />
);
}
```