[devilking7x]

Closes #591.

What

Long throws clauses now break one exception per line when they don't fit, instead of staying on one long line. When the clause breaks, the body { moves onto its own line — separating the throws clause from the body contents (the exact indentation-confusion case from #429).

This implements the #591 design: one exception per line when broken, { on its own line. Follows the Prettier TypeScript implements-clause precedent referenced in #591.

Implementation

• throws printer uses a plain group — one line when it fits, one-exception-per-line when broken (verified byte-identical output vs conditionalGroup across all 86 unit-test fixtures; plain group avoids the construct flagged as last-resort in the fix: break long throws clauses one exception per line #1041 review)
• method_declaration and constructor_declaration drop the body { to its own line only when throws breaks
• Uses symbol group ids (prettier's types require symbol; fixes the tsc errors from string ids)

Testing

• 226/226 unit tests pass, zero regressions
• Output matches all 6 expected-output examples from feat: improve throws breaking #591 character-for-character
• New edge-case coverage: single very long exception name, generic exception types, nested classes, interface methods, default methods with breaking throws clauses
• ESLint clean, tsc clean, Prettier format check clean, 5× idempotency clean

[devilking7x]

Hi — following today's review discussion on #1041, I wanted to note that this PR implements the #591 design you described there: when a throws clause breaks, the exceptions print one per line and the body { moves onto its own line, separating the throws clause from the body contents (the exact indentation-confusion case from #429). This follows the Prettier TypeScript implements-clause precedent referenced in #591.

I verified the output against the expected output posted in #591 — all 6 examples format character-for-character identical.

The latest commit also: replaces conditionalGroup with an equivalent plain group (verified byte-identical output across all 86 unit-test fixtures), avoiding the construct flagged as last-resort in the #1041 review; fixes the tsc errors from string group ids (prettier's types require symbol); and adds test coverage for edge cases — a single very long exception name, generic exception types, nested classes, interface methods, and default methods with breaking throws clauses.

226/226 unit tests pass; eslint, tsc, prettier format check, and 5× idempotency all clean.

[jtkiesel]

Closing in favor of #591.