Sandbox::https://github.com/prettier/prettier/pull/19792

santhiprakash · 2026-08-06T02:29:06Z

Description

Fix an extra level of indentation that Prettier adds to the contents of an array or object literal when it appears as the last operand of a logical chain (??, &&, ||) and every operand in the chain is an inline array/object/JSX literal.

When printBinaryishExpression determined it should use the chain layout, it wrapped the whole tail in indent(), which compounded with the array/object's own indentation. The new isInlineLogicalExpression helper checks whether the entire flattened chain consists of inline right-hand operands; if so, the outer indent() is skipped and the array/object contents align with the surrounding expression instead of being shifted one extra level.

Fixes #5183

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pkg-pr-new · 2026-08-06T02:30:54Z

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When a logical chain (??/&&/||) ends with an array or object literal and every operand in the chain is "inline", the binary printer was wrapping the whole tail in an extra `indent()`. This caused the array/object contents to be indented one level too deep relative to the surrounding expression. Add an `isInlineLogicalExpression` helper that checks the entire flattened chain for inline right-hand operands, and skip the outer `indent()` when the whole chain is inline. Existing behavior for chains that contain a non-inline operand (which need the indent for the line break before the operand) is preserved. Fixes prettier#5183

fisker · 2026-08-25T20:19:35Z

Waiting for regression test. prettier/prettier-regression-testing#731 (comment)

santhiprakash · 2026-09-13T09:42:03Z

Regression test completed — triggered via the standard command on prettier/prettier-regression-testing#731:

Run #19792

Full result: prettier/prettier-regression-testing#731 (comment) (workflow run), executed against this PR's current head (c122c42).

21/24 projects: empty diff. The three non-empty diffs are explained by the comparison baseline — prettier/prettier@main at run time was ~130 commits ahead of this branch's merge-base (8f2e4a6, 2026-08-13) — not by this change:

mdn/content — markdown-only hunks (blank lines inside paragraphs, > markers after [!NOTE] admonitions) matching upstream markdown changes that landed in that window (Improve > handling in blockquote in Markdown #19802, Refactor whitspace print #19861, Fix isSetextHeading #19912). A few embedded ```js blocks are also left unformatted by the older parsers on this branch's base (e.g. examples using top-level await; parser updates plus Allow recovery of invalid labels #19920 landed in the same window).
vega-lite .github/workflows/check.yml — one blank line after an if: >- folded scalar; matches fix(yaml): preserve trailing whitespace in block scalars #19764 (preserve trailing whitespace in block scalars), which also landed after the branch base.
webawesome .yarn/install-state.gz — binary file deleted by the harness's yarn install; the identical diff appears in every full corpus run (Handle zero-width marks in string width #19538, Ignore dangling comments when checking type parameter comments #19572, Fix comment around nullish coalescing #19652, …).

Nothing in the report is attributable to this PR: the only source change is src/language-js/print/binaryish.js (indentation decision for inlined logical-expression chains), and no hunk in the report touches that code path — no corpus project contains a ?? [-style chain that exercises it.

santhiprakash added a commit to santhiprakash/prettier that referenced this pull request Aug 6, 2026

chore: add changelog for prettier#19792

c6913cd

santhiprakash added a commit to santhiprakash/prettier that referenced this pull request Aug 12, 2026

chore: add changelog for prettier#19792

ec081c1

santhiprakash force-pushed the fix/5183-nullish-coalescing-array-indent branch 2 times, most recently from ec081c1 to 7f41a3d Compare August 12, 2026 23:29

santhiprakash added a commit to santhiprakash/prettier that referenced this pull request Aug 12, 2026

chore: add changelog for prettier#19792

7f41a3d

santhiprakash added 2 commits August 13, 2026 00:49

chore: add changelog for prettier#19792

c122c42

santhiprakash force-pushed the fix/5183-nullish-coalescing-array-indent branch from 7f41a3d to c122c42 Compare August 13, 2026 00:51

fisker approved these changes Aug 25, 2026

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fisker added this to the 3.10 milestone Aug 25, 2026

github-actions Bot mentioned this pull request Aug 25, 2026

Misc prettier/prettier-regression-testing#731

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fisker merged commit 39888ab into prettier:main Oct 13, 2026
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Fix extra indentation for inline array/object in logical chains - #19792

Fix extra indentation for inline array/object in logical chains#19792
fisker merged 2 commits into
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santhiprakash:fix/5183-nullish-coalescing-array-indent

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