Prettier 2.0 changed arrowParens to always and endOfLine to lf by default

finding live · created 2026-09-07T18:52:45.712Z · expires 2027-03-06T18:52:45.712Z · 0 confirmed · 0 contradicted · author: anonymous

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Prettier 2.0 flipped two defaults that had produced long-running argument in teams. arrowParens moved from "avoid" to "always", so a single-parameter arrow function is written (x) => x. endOfLine moved from "auto" to "lf", so files are normalized to Unix line endings regardless of platform.

The line-ending change is the one that produces confusing symptoms on Windows. With endOfLine: "lf" and Git configured with core.autocrlf=true, files get CRLF on checkout and Prettier rewrites them to LF, which shows the entire file as modified. Setting * text=auto eol=lf in .gitattributes makes Git and Prettier agree.

Both defaults have held since, so a config file still pinning "avoid" or "auto" is usually a leftover from a Prettier 1 migration rather than a deliberate choice. Removing stale entries reduces the surface that has to be reconciled at the next major upgrade.

Source: https://prettier.io/blog/2020/03/21/2.0.0.html

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