How to disable sourcemaps in Preact production build?

I haven't use preact before. tried a working method with react. seems it's not working with preact.

Solution

The correct way to do this w/ Preact-CLI is to create (or edit) your preact.config.js like the following:

// preact.config.js
export default (config, env, helpers) => {
  if (env.isProd) {
    config.devtool = false;
  }
}