test-repo/changelog_unreleased/api/13130.md

Support config files in ESM (#13130 by @fisker)

Config files in ESM are supported, supported config file names:

• prettier.config.js (in place with {"type": "module"} in package.json)
• .prettierrc.js (same as above)
• prettier.config.mjs
• .prettierrc.mjs.

export default {
  trailingComma: "es5",
  tabWidth: 4,
  semi: false,
  singleQuote: true,
};

Shareable config package can also be a pure ESM package.