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Home / Migrations / Sass legacy JS API → Sass modern API

Sass legacy JS API → Sass modern API

easy

The Sass legacy JS API (renderSync/render) is deprecated. Modern API (compile/compileString) is faster, required by Vite 6+, and supports custom importers.

Estimated: 0.5-1h · 4 steps

Progress0%

Step 1: Update sass package

npm install sass@latest

Step 2: Update bundler config

Vite: css.preprocessorOptions.scss.api = 'modern-compiler'. Webpack sass-loader: api: 'modern-compiler'.

Step 3: Fix custom Sass usage

If calling Sass directly: sass.renderSync() → sass.compile(). sass.render() → sass.compileAsync(). Options format changed.

Step 4: Test styles

✓ All SCSS compiles. No deprecation warnings. Build output unchanged.

What this migration involves

Moving from Sass legacy JS API to Sass modern API is rated easy and takes about 0.5-1h on a typical project. The guide breaks it into 4 steps, 1 of which ship with runnable commands and 1 with a verification check.

Related migrations

styled-components → Tailwind CSS — hard, 8-20h

FAQ

How long does migrating from Sass legacy JS API to Sass modern API take?

Around 0.5-1h for a typical project — 4 steps, difficulty rated easy, 1 of them with copy-paste commands.

Is moving from Sass legacy JS API to Sass modern API reversible?

No reverse guide is tracked yet, so treat this as a one-way move and keep a full export of your Sass legacy JS API data before you start.

What does Sass modern API cost compared to Sass legacy JS API?

Pricing for both tools is contact-based or not tracked yet.