Verify each finding against the current code and only fix it if needed.

Inline comments:
In @.changeset/calm-impalas-stare.md:
- Around line 5-13: The changeset line mentioning internal extraction and the
misspelled word "sunsuet" exposes implementation details and should be removed;
edit the .changeset text to keep only a short, user-facing description (1–3
sentences) of the new lint rule useExplicitReturnType and its impact plus the
example snippet, and drop any mention of the previous rule useExplicitType or
internal migration details so the note reads as a concise release note for
users.

In `@crates/biome_js_analyze/src/lint/nursery/use_explicit_return_type.rs`:
- Around line 191-205: Docs and implementation disagree: the allowExpressions
option is meant to skip function expressions but current code still flags
variable-assigned functions and never checks object members against the option.
Update the rule so that the allow_expressions config (often accessed as
allowExpressions or allow_expressions) is consulted in the branches that handle
ArrowFunctionExpression and FunctionExpression (e.g., the handlers/visitors
named visit_arrow_function / visit_function_expression or
check_assigned_function) and also in the object-member handling (e.g.,
visit_property / check_object_member / object_literal branch) so that when
allow_expressions == true those expression-based functions are skipped, and when
false they are still enforced; ensure the option name used matches the config
struct/field (e.g., UseExplicitReturnType::allow_expressions) and add tests
covering const foo = () => {}, const foo = function(){}, and object members to
validate behavior.
- Around line 265-267: The metadata incorrectly uses
RuleSource::EslintTypeScript("explicit-function-return-type").same() even though
this rule narrows the typescript-eslint option surface; replace .same() with
.inspired() on the RuleSource::EslintTypeScript("explicit-function-return-type")
entry so the rule is marked as inspired (not identical) to the upstream
eslint-typescript rule.

In
`@crates/biome_js_analyze/tests/specs/nursery/useExplicitReturnType/allowedNames/invalid.ts`:
- Around line 14-17: The current test uses a duplicated binding "let [test,
test]" which causes a parser/binding error instead of exercising the
allowedNames path; replace the duplicated identifier in the array destructuring
with two distinct identifiers and make sure exactly one of those identifiers is
not in the allowedNames list so the fixture stays parseable and triggers the
allowedNames check (update the array pattern in the let declaration that
currently reads "let [test, test]" to use two unique names, leaving one
intentionally unlisted).

In
`@crates/biome_js_analyze/tests/specs/nursery/useExplicitReturnType/allowExpressions/invalid.ts`:
- Around line 12-15: The file contains two top-level default exports ("export
default () => {}" and "export default function () {}") in the same module which
causes an unrelated module-level diagnostic; split them so each snippet/module
contains only one default export — move "export default () => {}" and "export
default function () {}" into separate test snippets/files (or separate code
blocks) so each test focuses on the explicit-return-type rule for a single
export.

In
`@crates/biome_js_analyze/tests/specs/nursery/useExplicitReturnType/invalid.ts`:
- Around line 22-27: The setter in class Test (`set prop() {}`) is syntactically
invalid because JS setters require exactly one parameter; update the setter for
the Test class (the `set prop` method) to accept a single parameter (e.g.,
`value`) so the fixture remains valid and does not produce unrelated parser
diagnostics that pollute the useExplicitReturnType snapshot test.

---

Nitpick comments:
In `@crates/biome_rule_options/src/use_explicit_return_type.rs`:
- Around line 6-18: Add a one-line rustdoc summary for the public struct
UseExplicitReturnTypeOptions by placing a short descriptive comment (/// ...)
immediately above the struct declaration; ensure it succinctly describes the
purpose of the options type (e.g., "Options for the `use_explicit_return_type`
rule") so generated docs have a proper summary and follow the project's inline
rustdoc guideline.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@crates/biome_js_analyze/src/lint/nursery/use_explicit_return_type.rs`:
- Around line 572-604: collect_returns_from_stmt currently only recurses into
if/blocks/switches and therefore misses return statements inside
try/catch/finally and loop constructs; update collect_returns_from_stmt to match
and handle AnyJsTryStatement (descend into its try block, any catch clause
bodies, and finally block via collect_returns_from_stmts) and to handle loop
node kinds (AnyJsForStatement, AnyJsForInStatement, AnyJsForOfStatement,
AnyJsWhileStatement, AnyJsDoWhileStatement) by extracting each loop's body and
calling collect_returns_from_stmt or collect_returns_from_stmts as appropriate;
keep using the existing helper collect_returns_from_stmts and the function name
collect_returns_from_stmt to locate where to add these new match arms.

---

Nitpick comments:
In `@crates/biome_js_analyze/src/lint/nursery/use_explicit_return_type.rs`:
- Around line 78-79: The doc comment is misleading: instead of saying "We only
check whether the first statement is a function return", update the wording to
reflect the actual behavior implemented by the helper all_returns_are_functions
(which inspects all return statements in the function body to ensure they return
function expressions). Edit the comment near the higher-order function example
to state that the lint verifies every return in the body is a function
expression (referencing the all_returns_are_functions helper) rather than only
checking the first statement.
- Around line 512-516: The is_iife detection currently only checks for a
JsParenthesizedExpression followed by a JsCallExpression, so it misses IIFEs
wrapped by unary operators (e.g., !function(){}, void function(){},
+function(){}). Update is_iife (function is_iife and its use of AnyJsFunction,
JsParenthesizedExpression, JsCallExpression) to also consider when the
function's parent is a JsUnaryExpression (check for operators like !, void, +,
-) possibly wrapped in a JsParenthesizedExpression, and then has a
JsCallExpression as an ancestor; in short, extend the parent-chain checks to
include JsUnaryExpression (and optional parenthesized wrapper) before the call
so patterns like !function(){}() and void function(){}() are recognized by
allowIifes.

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@crates/biome_js_analyze/src/lint/nursery/use_explicit_return_type.rs`:
- Around line 399-404: The function is_function_used_in_argument currently only
inspects the immediate parent and misses cases where the function is wrapped in
JsParenthesizedExpression; update is_function_used_in_argument (working on
AnyJsFunction) to walk up ancestors/unwrap parenthesized nodes until a
non-parenthesized ancestor is reached, then check if that ancestor's kind()
matches JsSyntaxKind::JS_CALL_ARGUMENT_LIST (or return false if no such
ancestor), so calls like foo(((() => {}))) are correctly detected as call
arguments.

---

Duplicate comments:
In `@crates/biome_js_analyze/src/lint/nursery/use_explicit_return_type.rs`:
- Around line 867-906: The code enforces that when allow_expressions is true,
variable-assigned functions, class property functions, and export-default
expressions still require return types (logic around is_function_expression,
is_variable_assigned using
JsInitializerClause/JsVariableDeclarator/JsPropertyClassMember, and
is_export_default matching AnyJsFunction::JsFunctionExportDefaultDeclaration),
but the user-facing docs claim only function declarations and class methods are
checked; update the documentation to accurately reflect the implementation:
state that allowExpressions permits bare expression
callbacks/parenthesized/IIFEs but still requires explicit return types for
variable-assigned functions (const foo = ...), class property arrow/function
members, and export default function expressions, and include the same
examples/comments from the code so docs and implementation match.
- Around line 310-335: The object method/getter branches
(AnyFunctionLikeWithReturnType::JsMethodObjectMember and ::JsGetterObjectMember)
don't honor the allow_expressions option; mirror the logic used in
handle_any_function by checking options.allow_expressions and, when true and the
member is being used as an expression/context (e.g., via
is_member_inside_call_argument or a similar expression-detection helper), return
None so no lint is produced. Update the branches that reference method, getter,
get_method_object_member_name, get_getter_object_member_name and
is_member_inside_call_argument to early-return when allow_expressions is enabled
and the member is in an expression context.

---

Nitpick comments:
In `@crates/biome_js_analyze/src/lint/nursery/use_explicit_return_type.rs`:
- Around line 711-726: is_member_inside_call_argument currently checks only the
immediate parent of a JsObjectExpression for JS_CALL_ARGUMENT_LIST; update it to
unwrap/skip any intermediate parenthesized expressions (like
is_function_used_in_argument does) before checking the parent kind. Locate the
function is_member_inside_call_argument and, for each ancestor that is a
JsObjectExpression, walk up parents while
JsParenthesizedExpression::can_cast(parent.kind()) to reach the real enclosing
node, then test that node.kind() == JsSyntaxKind::JS_CALL_ARGUMENT_LIST
(referencing JsObjectExpression, JsParenthesizedExpression::can_cast, and
JS_CALL_ARGUMENT_LIST) so calls wrapped in parentheses are detected correctly.