How is the function exported? Is it a default export or a named one?

The function is exported as a default export.

In index.js:L1, the function is declared directly with export default function escapeStringRegexp(string) {...}, making it the module's default export.

This is confirmed in several other places:

• The TypeScript type declaration mirrors this with export default function escapeStringRegexp(string: string): string; [index.d.ts:L16-L17]
• All usage examples import it as a default import: import escapeStringRegexp from 'escape-string-regexp'; (seen in the README usage section, [readme.md:L14-L23], and in the test files [test.js:L1-L2] and [index.test-d.ts:L1-L2])
• The package.json exports field points to ./index.js [package.json:L14], which is the module containing that default export.

So there's no named export — consumers always import it as the default, e.g. import escapeStringRegexp from 'escape-string-regexp'.

FOLLOW_UPS:

• What characters does escapeStringRegexp actually escape?
• Why is - escaped differently than other characters?
• What Node.js versions does this package support?