How do you organize CSS isolation in Vue components…

Used several approaches depending on the project scale and requirements:

Scoped CSS: The most common method in Vue. Styles are applied only to the current component's elements by automatically adding unique attributes to CSS selectors and DOM elements.

<template>
  <div class="container">
    Hello, Vue!
  </div>
</template>

<style scoped>
/* This style will only apply to the div with class container inside this component */
.container {
  color: blue;
}
</style>

CSS Modules: Allow creating local CSS classes that are automatically generated with unique names. Imported as an object in JavaScript. Provide explicit style localization.

<template>
  <div :class="$style.container">
    Hello, Modules!
  </div>
</template>

<style module>
/* The 'container' class will have a unique name during build */
.container {
  color: green;
}
</style>

CSS-in-JS (with libraries like Emotion or Styled Components via plugins): Styles are written directly in JavaScript/TypeScript. Provide strong isolation and dynamic styles but may increase bundle size and complexity.

// Pseudocode example with a hypothetical library
import styled from 'vue-styled-components'; // Example import

const StyledDiv = styled.div` // Creating a styled component
  color: purple;
`;

export default {
  components: {
    StyledDiv,
  },
  template: `<styled-div>Hello, CSS-in-JS!</styled-div>`,
};

Naming Conventions (BEM): Using strict naming conventions like Block-Element-Modifier. Does not provide technical isolation through the framework but improves readability and predictability.

The choice of method depended on:

Team size.
Component complexity.
Need for style reusability.
Accepted standards in the project.

Most often, I used scoped for most components due to its simplicity and efficiency. CSS Modules were used for more complex cases requiring stricter localization or dynamic classes. CSS-in-JS was rarely used, mainly in projects where it was already used or there was a clear need. Naming Conventions always complemented other approaches.

How do you organize CSS isolation in Vue components in your projects?