Does this respect the user's locale for number formatting?

Yes, pretty-bytes does respect the user's locale for number formatting through the locale option.

The library uses the toLocaleString function [index.js:L55-L65] to format numbers according to a specified locale. Here's how it works:

Locale option behaviors:

1. locale: false (default) — No localization; numbers are formatted without locale-specific formatting.

2. locale: true — Uses the system/browser's default locale for formatting.

3. locale: 'de' or other language tag — Formats using a specific BCP 47 language tag (e.g., German uses commas as decimal separators and periods as thousand separators).

4. locale: ['unknown', 'de', 'en'] — Accepts an array of language tags; the first supported locale is used.

Example from the tests [test.js:L71-L110]:

• prettyBytes(1001, {locale: 'de'}) → '1 kB' (German formatting)
• prettyBytes(1e30, {locale: 'de'}) → '1.000.000 YB' (uses periods for thousands)
• prettyBytes(1e30, {locale: 'en'}) → '1,000,000 YB' (uses commas for thousands)

The implementation calls Number.prototype.toLocaleString() internally, which handles all locale-specific number formatting conventions [index.js:L55-L65].

FOLLOW_UPS:

• What does the signed option do?
• How does the binary prefix option work?
• What is the fixedWidth option for?