diff --git a/.clippy.toml b/.clippy.toml
index c76422cd094e8..631686352e964 100644
--- a/.clippy.toml
+++ b/.clippy.toml
@@ -1,3 +1,5 @@
+avoid-breaking-exported-api = false
+
 ignore-interior-mutability = ["oxc_linter::rules::RuleEnum"]
 
 disallowed-methods = [
diff --git a/.github/workflows/miri.yml b/.github/workflows/miri.yml
index 351336dedbfca..21d1bc511243d 100644
--- a/.github/workflows/miri.yml
+++ b/.github/workflows/miri.yml
@@ -51,7 +51,5 @@ jobs:
 
       - name: Test with Miri
         run: |
-          cargo miri test -p oxc_ast --all-features
-          cargo miri test -p oxc_data_structures --all-features
-          cargo miri test -p oxc_parser
-          cargo miri test -p oxc_transformer
+          cargo miri test --doc --all-features -p oxc_ast -p oxc_data_structures
+          cargo miri test -p oxc_parser -p oxc_transformer
diff --git a/apps/oxlint/src/lint.rs b/apps/oxlint/src/lint.rs
index 827b55bfd9709..048c496a07928 100644
--- a/apps/oxlint/src/lint.rs
+++ b/apps/oxlint/src/lint.rs
@@ -248,20 +248,7 @@ impl Runner for LintRunner {
         let mut options =
             LintServiceOptions::new(self.cwd, paths).with_cross_module(use_cross_module);
 
-        let lint_config = match config_builder.build() {
-            Ok(config) => config,
-            Err(diagnostic) => {
-                print_and_flush_stdout(
-                    stdout,
-                    &format!(
-                        "Failed to parse configuration file.\n{}\n",
-                        render_report(&handler, &diagnostic)
-                    ),
-                );
-
-                return CliRunResult::InvalidOptionConfig;
-            }
-        };
+        let lint_config = config_builder.build();
 
         let report_unused_directives = match inline_config_options.report_unused_directives {
             ReportUnusedDirectives::WithoutSeverity(true) => Some(AllowWarnDeny::Warn),
@@ -439,20 +426,8 @@ impl LintRunner {
             }
             .with_filters(filters);
 
-            match builder.build() {
-                Ok(config) => nested_configs.insert(dir.to_path_buf(), config),
-                Err(diagnostic) => {
-                    print_and_flush_stdout(
-                        stdout,
-                        &format!(
-                            "Failed to parse configuration file.\n{}\n",
-                            render_report(handler, &diagnostic)
-                        ),
-                    );
-
-                    return Err(CliRunResult::InvalidOptionConfig);
-                }
-            };
+            let config = builder.build();
+            nested_configs.insert(dir.to_path_buf(), config);
         }
 
         Ok(nested_configs)
diff --git a/crates/oxc_ast/src/ast/js.rs b/crates/oxc_ast/src/ast/js.rs
index 1ba0166423951..04e0d60dd9afb 100644
--- a/crates/oxc_ast/src/ast/js.rs
+++ b/crates/oxc_ast/src/ast/js.rs
@@ -1,4 +1,8 @@
-#![expect(missing_docs)] // FIXME
+#![expect(
+    missing_docs, // FIXME
+    clippy::enum_variant_names,
+    clippy::struct_field_names,
+)]
 
 // NB: `#[span]`, `#[scope(...)]`,`#[visit(...)]` and `#[generate_derive(...)]` do NOT do anything to the code.
 // They are purely markers for codegen used in `tasks/ast_tools` and `crates/oxc_traverse/scripts`. See docs in those crates.
diff --git a/crates/oxc_ast/src/ast/ts.rs b/crates/oxc_ast/src/ast/ts.rs
index c61c8805c23d2..70d0dbfbd20fd 100644
--- a/crates/oxc_ast/src/ast/ts.rs
+++ b/crates/oxc_ast/src/ast/ts.rs
@@ -2,7 +2,10 @@
 //!
 //! - [AST Spec](https://github.com/typescript-eslint/typescript-eslint/tree/v8.9.0/packages/ast-spec)
 //! - [Archived TypeScript spec](https://github.com/microsoft/TypeScript/blob/3c99d50da5a579d9fa92d02664b1b66d4ff55944/doc/spec-ARCHIVED.md)
-#![expect(missing_docs)] // FIXME
+#![expect(
+    missing_docs, // FIXME
+    clippy::enum_variant_names,
+)]
 
 // NB: `#[span]`, `#[scope(...)]`,`#[visit(...)]` and `#[generate_derive(...)]` do NOT do anything to the code.
 // They are purely markers for codegen used in `tasks/ast_tools` and `crates/oxc_traverse/scripts`. See docs in those crates.
diff --git a/crates/oxc_ast/src/ast_builder_impl.rs b/crates/oxc_ast/src/ast_builder_impl.rs
index c78a1c23bc76b..1f4937b220d0e 100644
--- a/crates/oxc_ast/src/ast_builder_impl.rs
+++ b/crates/oxc_ast/src/ast_builder_impl.rs
@@ -10,6 +10,7 @@ use crate::{AstBuilder, ast::*};
 
 /// Type that can be used in any AST builder method call which requires an `IntoIn<'a, Anything<'a>>`.
 /// Pass `NONE` instead of `None::<Anything<'a>>`.
+#[expect(clippy::upper_case_acronyms)]
 pub struct NONE;
 
 impl<'a, T> FromIn<'a, NONE> for Option<Box<'a, T>> {
diff --git a/crates/oxc_ast/src/ast_impl/js.rs b/crates/oxc_ast/src/ast_impl/js.rs
index 2d53a057076a4..928e5e83f4552 100644
--- a/crates/oxc_ast/src/ast_impl/js.rs
+++ b/crates/oxc_ast/src/ast_impl/js.rs
@@ -1328,7 +1328,7 @@ impl<'a> Function<'a> {
 
 impl FunctionType {
     /// Returns `true` if it is a [`FunctionType::TSDeclareFunction`] or [`FunctionType::TSEmptyBodyFunctionExpression`].
-    pub fn is_typescript_syntax(&self) -> bool {
+    pub fn is_typescript_syntax(self) -> bool {
         matches!(self, Self::TSDeclareFunction | Self::TSEmptyBodyFunctionExpression)
     }
 }
diff --git a/crates/oxc_ast/src/ast_impl/literal.rs b/crates/oxc_ast/src/ast_impl/literal.rs
index ea03644c8e9d5..0b1282589280f 100644
--- a/crates/oxc_ast/src/ast_impl/literal.rs
+++ b/crates/oxc_ast/src/ast_impl/literal.rs
@@ -207,7 +207,7 @@ impl RegExpFlags {
     /// Convert [`RegExpFlags`] to an [`InlineString`].
     ///
     /// This performs the same role as `RegExpFlags::to_string`, but does not allocate.
-    pub fn to_inline_string(&self) -> InlineString<8, usize> {
+    pub fn to_inline_string(self) -> InlineString<8, usize> {
         let mut str = InlineString::new();
 
         // In alphabetical order.
diff --git a/crates/oxc_ast/src/ast_impl/ts.rs b/crates/oxc_ast/src/ast_impl/ts.rs
index e974a2451b112..5ea0a8a188fa7 100644
--- a/crates/oxc_ast/src/ast_impl/ts.rs
+++ b/crates/oxc_ast/src/ast_impl/ts.rs
@@ -184,7 +184,7 @@ impl TSModuleDeclarationKind {
 
     /// Declaration keyword as a string, identical to how it would appear in the
     /// source code.
-    pub fn as_str(&self) -> &'static str {
+    pub fn as_str(self) -> &'static str {
         match self {
             Self::Global => "global",
             Self::Module => "module",
@@ -295,12 +295,12 @@ impl<'a> Decorator<'a> {
 
 impl ImportOrExportKind {
     /// Returns `true` for "regular" imports and exports.
-    pub fn is_value(&self) -> bool {
+    pub fn is_value(self) -> bool {
         matches!(self, Self::Value)
     }
 
     /// Returns `true` if this is an `import type` or `export type` statement.
-    pub fn is_type(&self) -> bool {
+    pub fn is_type(self) -> bool {
         matches!(self, Self::Type)
     }
 }
diff --git a/crates/oxc_ast/src/generated/ast_builder.rs b/crates/oxc_ast/src/generated/ast_builder.rs
index 34d7716fb6654..d6f0e29d1129c 100644
--- a/crates/oxc_ast/src/generated/ast_builder.rs
+++ b/crates/oxc_ast/src/generated/ast_builder.rs
@@ -3,7 +3,11 @@
 
 //! AST node factories
 
-#![expect(clippy::default_trait_access, clippy::inconsistent_struct_constructor)]
+#![expect(
+    clippy::default_trait_access,
+    clippy::inconsistent_struct_constructor,
+    clippy::unused_self
+)]
 
 use std::cell::Cell;
 
diff --git a/crates/oxc_ast_visit/src/generated/visit.rs b/crates/oxc_ast_visit/src/generated/visit.rs
index b1263a23822d5..4e38bf5ec146a 100644
--- a/crates/oxc_ast_visit/src/generated/visit.rs
+++ b/crates/oxc_ast_visit/src/generated/visit.rs
@@ -7,7 +7,8 @@
 //! * [visitor pattern](https://rust-unofficial.github.io/patterns/patterns/behavioural/visitor.html)
 //! * [rustc visitor](https://github.com/rust-lang/rust/blob/1.82.0/compiler/rustc_ast/src/visit.rs)
 
-#![expect(unused_variables, clippy::semicolon_if_nothing_returned, clippy::match_same_arms)]
+#![expect(unused_variables, clippy::match_same_arms, clippy::semicolon_if_nothing_returned)]
+#![allow(clippy::needless_pass_by_ref_mut, clippy::trivially_copy_pass_by_ref)]
 
 use std::cell::Cell;
 
diff --git a/crates/oxc_ast_visit/src/generated/visit_mut.rs b/crates/oxc_ast_visit/src/generated/visit_mut.rs
index 72e885875ac73..9b350e1e6e562 100644
--- a/crates/oxc_ast_visit/src/generated/visit_mut.rs
+++ b/crates/oxc_ast_visit/src/generated/visit_mut.rs
@@ -7,7 +7,8 @@
 //! * [visitor pattern](https://rust-unofficial.github.io/patterns/patterns/behavioural/visitor.html)
 //! * [rustc visitor](https://github.com/rust-lang/rust/blob/1.82.0/compiler/rustc_ast/src/visit.rs)
 
-#![expect(unused_variables, clippy::semicolon_if_nothing_returned, clippy::match_same_arms)]
+#![expect(unused_variables, clippy::match_same_arms, clippy::semicolon_if_nothing_returned)]
+#![allow(clippy::needless_pass_by_ref_mut, clippy::trivially_copy_pass_by_ref)]
 
 use std::cell::Cell;
 
diff --git a/crates/oxc_data_structures/src/stack/non_empty.rs b/crates/oxc_data_structures/src/stack/non_empty.rs
index f33233e5d9e1b..b6f376e20c2a0 100644
--- a/crates/oxc_data_structures/src/stack/non_empty.rs
+++ b/crates/oxc_data_structures/src/stack/non_empty.rs
@@ -354,6 +354,7 @@ impl<T> NonEmptyStack<T> {
     }
 
     /// Get if stack is empty. Always returns `false`.
+    #[expect(clippy::unused_self)]
     #[inline]
     pub fn is_empty(&self) -> bool {
         // This method is pointless, as the stack is never empty. But provide it to override
diff --git a/crates/oxc_formatter/src/formatter/token/string.rs b/crates/oxc_formatter/src/formatter/token/string.rs
index 8e50681109234..106054dabd3aa 100644
--- a/crates/oxc_formatter/src/formatter/token/string.rs
+++ b/crates/oxc_formatter/src/formatter/token/string.rs
@@ -7,20 +7,20 @@ pub enum Quote {
 }
 
 impl Quote {
-    pub fn as_char(&self) -> char {
+    pub fn as_char(self) -> char {
         match self {
             Quote::Double => '"',
             Quote::Single => '\'',
         }
     }
 
-    pub fn as_byte(&self) -> u8 {
+    pub fn as_byte(self) -> u8 {
         self.as_char() as u8
     }
 
     /// Given the current quote, it returns the other one
     #[must_use]
-    pub fn other(&self) -> Self {
+    pub fn other(self) -> Self {
         match self {
             Quote::Double => Quote::Single,
             Quote::Single => Quote::Double,
diff --git a/crates/oxc_formatter/src/options.rs b/crates/oxc_formatter/src/options.rs
index 5dc15da1f99da..cd3df6f44bca0 100644
--- a/crates/oxc_formatter/src/options.rs
+++ b/crates/oxc_formatter/src/options.rs
@@ -115,12 +115,12 @@ impl IndentStyle {
     pub const DEFAULT_SPACES: u8 = 2;
 
     /// Returns `true` if this is an [IndentStyle::Tab].
-    pub const fn is_tab(&self) -> bool {
+    pub const fn is_tab(self) -> bool {
         matches!(self, IndentStyle::Tab)
     }
 
     /// Returns `true` if this is an [IndentStyle::Space].
-    pub const fn is_space(&self) -> bool {
+    pub const fn is_space(self) -> bool {
         matches!(self, IndentStyle::Space)
     }
 }
@@ -163,7 +163,7 @@ pub enum LineEnding {
 
 impl LineEnding {
     #[inline]
-    pub const fn as_str(&self) -> &'static str {
+    pub const fn as_str(self) -> &'static str {
         match self {
             LineEnding::Lf => "\n",
             LineEnding::Crlf => "\r\n",
@@ -172,17 +172,17 @@ impl LineEnding {
     }
 
     /// Returns `true` if this is a [LineEnding::Lf].
-    pub const fn is_line_feed(&self) -> bool {
+    pub const fn is_line_feed(self) -> bool {
         matches!(self, LineEnding::Lf)
     }
 
     /// Returns `true` if this is a [LineEnding::Crlf].
-    pub const fn is_carriage_return_line_feed(&self) -> bool {
+    pub const fn is_carriage_return_line_feed(self) -> bool {
         matches!(self, LineEnding::Crlf)
     }
 
     /// Returns `true` if this is a [LineEnding::Cr].
-    pub const fn is_carriage_return(&self) -> bool {
+    pub const fn is_carriage_return(self) -> bool {
         matches!(self, LineEnding::Cr)
     }
 }
@@ -219,7 +219,7 @@ impl IndentWidth {
     pub const MIN: u8 = 0;
 
     /// Return the numeric value for this [IndentWidth]
-    pub fn value(&self) -> u8 {
+    pub fn value(self) -> u8 {
         self.0
     }
 }
@@ -278,7 +278,7 @@ impl LineWidth {
     pub const MIN: u16 = 1;
 
     /// Return the numeric value for this [LineWidth]
-    pub fn value(&self) -> u16 {
+    pub fn value(self) -> u16 {
         self.0
     }
 }
@@ -410,14 +410,14 @@ impl QuoteStyle {
         }
     }
 
-    pub fn as_char(&self) -> char {
+    pub fn as_char(self) -> char {
         match self {
             QuoteStyle::Double => '"',
             QuoteStyle::Single => '\'',
         }
     }
 
-    pub fn as_byte(&self) -> u8 {
+    pub fn as_byte(self) -> u8 {
         self.as_char() as u8
     }
 
@@ -431,14 +431,14 @@ impl QuoteStyle {
 
     /// Given the current quote, it returns the other one
     #[must_use]
-    pub fn other(&self) -> Self {
+    pub fn other(self) -> Self {
         match self {
             QuoteStyle::Double => QuoteStyle::Single,
             QuoteStyle::Single => QuoteStyle::Double,
         }
     }
 
-    pub const fn is_double(&self) -> bool {
+    pub const fn is_double(self) -> bool {
         matches!(self, Self::Double)
     }
 }
@@ -527,11 +527,11 @@ pub enum Semicolons {
 }
 
 impl Semicolons {
-    pub const fn is_as_needed(&self) -> bool {
+    pub const fn is_as_needed(self) -> bool {
         matches!(self, Self::AsNeeded)
     }
 
-    pub const fn is_always(&self) -> bool {
+    pub const fn is_always(self) -> bool {
         matches!(self, Self::Always)
     }
 }
@@ -568,11 +568,11 @@ pub enum ArrowParentheses {
 }
 
 impl ArrowParentheses {
-    pub const fn is_as_needed(&self) -> bool {
+    pub const fn is_as_needed(self) -> bool {
         matches!(self, Self::AsNeeded)
     }
 
-    pub const fn is_always(&self) -> bool {
+    pub const fn is_always(self) -> bool {
         matches!(self, Self::Always)
     }
 }
@@ -629,7 +629,7 @@ pub enum TrailingSeparator {
 
 impl FormatTrailingCommas {
     /// This function returns corresponding [TrailingSeparator] for `format_separated` function.
-    pub fn trailing_separator(&self, options: &FormatOptions) -> TrailingSeparator {
+    pub fn trailing_separator(self, options: &FormatOptions) -> TrailingSeparator {
         if options.trailing_commas.is_none() {
             return TrailingSeparator::Omit;
         }
@@ -674,15 +674,15 @@ pub enum TrailingCommas {
 }
 
 impl TrailingCommas {
-    pub const fn is_es5(&self) -> bool {
+    pub const fn is_es5(self) -> bool {
         matches!(self, TrailingCommas::Es5)
     }
 
-    pub const fn is_all(&self) -> bool {
+    pub const fn is_all(self) -> bool {
         matches!(self, TrailingCommas::All)
     }
 
-    pub const fn is_none(&self) -> bool {
+    pub const fn is_none(self) -> bool {
         matches!(self, TrailingCommas::None)
     }
 }
@@ -748,7 +748,7 @@ pub struct BracketSpacing(bool);
 
 impl BracketSpacing {
     /// Return the boolean value for this [BracketSpacing]
-    pub fn value(&self) -> bool {
+    pub fn value(self) -> bool {
         self.0
     }
 }
@@ -792,7 +792,7 @@ pub struct BracketSameLine(bool);
 
 impl BracketSameLine {
     /// Return the boolean value for this [BracketSameLine]
-    pub fn value(&self) -> bool {
+    pub fn value(self) -> bool {
         self.0
     }
 }
diff --git a/crates/oxc_isolated_declarations/src/declaration.rs b/crates/oxc_isolated_declarations/src/declaration.rs
index 740ae68819654..cd119f57ec8df 100644
--- a/crates/oxc_isolated_declarations/src/declaration.rs
+++ b/crates/oxc_isolated_declarations/src/declaration.rs
@@ -192,7 +192,7 @@ impl<'a> IsolatedDeclarations<'a> {
             }
             Declaration::TSEnumDeclaration(enum_decl) => {
                 if !check_binding || self.scope.has_reference(&enum_decl.id.name) {
-                    self.transform_ts_enum_declaration(enum_decl)
+                    Some(self.transform_ts_enum_declaration(enum_decl))
                 } else {
                     None
                 }
diff --git a/crates/oxc_isolated_declarations/src/enum.rs b/crates/oxc_isolated_declarations/src/enum.rs
index ef2ea80b6d390..ea71d70a5c94f 100644
--- a/crates/oxc_isolated_declarations/src/enum.rs
+++ b/crates/oxc_isolated_declarations/src/enum.rs
@@ -18,10 +18,7 @@ enum ConstantValue {
 }
 
 impl<'a> IsolatedDeclarations<'a> {
-    pub fn transform_ts_enum_declaration(
-        &mut self,
-        decl: &TSEnumDeclaration<'a>,
-    ) -> Option<Declaration<'a>> {
+    pub fn transform_ts_enum_declaration(&self, decl: &TSEnumDeclaration<'a>) -> Declaration<'a> {
         let mut members = self.ast.vec();
         let mut prev_initializer_value = Some(ConstantValue::Number(-1.0));
         let mut prev_members = FxHashMap::default();
@@ -83,13 +80,13 @@ impl<'a> IsolatedDeclarations<'a> {
             members.push(member);
         }
 
-        Some(self.ast.declaration_ts_enum(
+        self.ast.declaration_ts_enum(
             decl.span,
             decl.id.clone_in(self.ast.allocator),
             self.ast.ts_enum_body(decl.body.span, members),
             decl.r#const,
             self.is_declare(),
-        ))
+        )
     }
 
     /// Evaluate the expression to a constant value.
diff --git a/crates/oxc_isolated_declarations/src/signatures.rs b/crates/oxc_isolated_declarations/src/signatures.rs
index 8cac1e7ed2dfe..34c2e25b6f916 100644
--- a/crates/oxc_isolated_declarations/src/signatures.rs
+++ b/crates/oxc_isolated_declarations/src/signatures.rs
@@ -11,7 +11,7 @@ impl<'a> IsolatedDeclarations<'a> {
     ///
     /// Infer get accessor return type from set accessor's param type
     /// Infer set accessor parameter type from get accessor return type
-    pub fn transform_ts_signatures(&mut self, signatures: &mut ArenaVec<'a, TSSignature<'a>>) {
+    pub fn transform_ts_signatures(&self, signatures: &mut ArenaVec<'a, TSSignature<'a>>) {
         // <name, (requires_inference, first_param_annotation, return_type)>
         let mut method_annotations: FxHashMap<_, (bool, _, _)> = FxHashMap::default();
 
diff --git a/crates/oxc_language_server/src/linter/server_linter.rs b/crates/oxc_language_server/src/linter/server_linter.rs
index 8e7127ee3ceae..d45e56e8deaec 100644
--- a/crates/oxc_language_server/src/linter/server_linter.rs
+++ b/crates/oxc_language_server/src/linter/server_linter.rs
@@ -61,7 +61,7 @@ impl ServerLinter {
             config_builder.plugins().has_import()
         };
 
-        let base_config = config_builder.build().expect("Failed to build config store");
+        let base_config = config_builder.build();
 
         let lint_options = LintOptions { fix: options.fix_kind(), ..Default::default() };
 
@@ -123,10 +123,7 @@ impl ServerLinter {
                 warn!("Skipping config (builder failed): {}", file_path.display());
                 continue;
             };
-            let Ok(config_store) = config_store_builder.build() else {
-                warn!("Skipping config (builder failed): {}", file_path.display());
-                continue;
-            };
+            let config_store = config_store_builder.build();
 
             nested_configs.pin().insert(dir_path.to_path_buf(), config_store);
         }
diff --git a/crates/oxc_linter/src/config/config_builder.rs b/crates/oxc_linter/src/config/config_builder.rs
index 9d0c54d65e614..9639bb4dbe21d 100644
--- a/crates/oxc_linter/src/config/config_builder.rs
+++ b/crates/oxc_linter/src/config/config_builder.rs
@@ -6,7 +6,6 @@ use std::{
 use itertools::Itertools;
 use rustc_hash::FxHashMap;
 
-use oxc_diagnostics::OxcDiagnostic;
 use oxc_span::{CompactStr, format_compact_str};
 
 use crate::{
@@ -293,8 +292,7 @@ impl ConfigStoreBuilder {
         }
     }
 
-    /// # Errors
-    pub fn build(self) -> Result<Config, OxcDiagnostic> {
+    pub fn build(self) -> Config {
         // When a plugin gets disabled before build(), rules for that plugin aren't removed until
         // with_filters() gets called. If the user never calls it, those now-undesired rules need
         // to be taken out.
@@ -308,8 +306,7 @@ impl ConfigStoreBuilder {
             self.rules.into_iter().collect::<Vec<_>>()
         };
         rules.sort_unstable_by_key(|(r, _)| r.id());
-
-        Ok(Config::new(rules, self.config, self.overrides))
+        Config::new(rules, self.config, self.overrides)
     }
 
     /// Warn for all correctness rules in the given set of plugins.
@@ -652,7 +649,7 @@ mod test {
         let mut desired_plugins = LintPlugins::default();
         desired_plugins.set(LintPlugins::TYPESCRIPT, false);
 
-        let linter = ConfigStoreBuilder::default().with_plugins(desired_plugins).build().unwrap();
+        let linter = ConfigStoreBuilder::default().with_plugins(desired_plugins).build();
         for (rule, _) in linter.base.rules.iter() {
             let name = rule.name();
             let plugin = rule.plugin_name();
@@ -1029,13 +1026,9 @@ mod test {
         ConfigStoreBuilder::from_oxlintrc(true, Oxlintrc::from_file(&PathBuf::from(path)).unwrap())
             .unwrap()
             .build()
-            .unwrap()
     }
 
     fn config_store_from_str(s: &str) -> Config {
-        ConfigStoreBuilder::from_oxlintrc(true, serde_json::from_str(s).unwrap())
-            .unwrap()
-            .build()
-            .unwrap()
+        ConfigStoreBuilder::from_oxlintrc(true, serde_json::from_str(s).unwrap()).unwrap().build()
     }
 }
diff --git a/crates/oxc_linter/src/loader/mod.rs b/crates/oxc_linter/src/loader/mod.rs
index 5f6dfb424cc67..5708d261ac8c5 100644
--- a/crates/oxc_linter/src/loader/mod.rs
+++ b/crates/oxc_linter/src/loader/mod.rs
@@ -21,33 +21,6 @@ impl Loader {
                 .and_then(std::ffi::OsStr::to_str)
                 .is_some_and(|ext| LINT_PARTIAL_LOADER_EXTENSIONS.contains(&ext))
     }
-
-    /// # Errors
-    /// - If the file is too large (> 4GB, or u32::MAX)
-    /// - If the file has no extension
-    /// - If the file extension is not supported
-    pub fn load_str<'a, P: AsRef<Path>>(
-        &self,
-        path: P,
-        source_text: &'a str,
-    ) -> Result<Vec<JavaScriptSource<'a>>, LoadError> {
-        if source_text.len() > u32::MAX as usize {
-            return Err(LoadError::TooLarge);
-        }
-
-        let path = path.as_ref();
-        let ext = path.extension().ok_or(LoadError::NoExtension)?;
-        // file extension is not unicode, we definitely don't support it.
-        let ext = ext.to_str().ok_or_else(|| LoadError::unsupported(ext))?;
-
-        // let source_type = SourceType::from_path(path);
-        if let Ok(source_type) = SourceType::from_path(path) {
-            Ok(vec![JavaScriptSource::new(source_text, source_type)])
-        } else {
-            let partial = PartialLoader::parse(ext, source_text);
-            partial.ok_or_else(|| LoadError::UnsupportedFileType(ext.to_string()))
-        }
-    }
 }
 
 #[derive(Debug, Clone)]
@@ -57,12 +30,6 @@ pub enum LoadError {
     UnsupportedFileType(String),
 }
 
-impl LoadError {
-    pub(super) fn unsupported(ext: &std::ffi::OsStr) -> Self {
-        Self::UnsupportedFileType(ext.to_string_lossy().to_string())
-    }
-}
-
 impl fmt::Display for LoadError {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
diff --git a/crates/oxc_linter/src/rules/jest/no_large_snapshots.rs b/crates/oxc_linter/src/rules/jest/no_large_snapshots.rs
index da4f533b1465c..f01eaa86c7f22 100644
--- a/crates/oxc_linter/src/rules/jest/no_large_snapshots.rs
+++ b/crates/oxc_linter/src/rules/jest/no_large_snapshots.rs
@@ -155,7 +155,7 @@ impl Rule for NoLargeSnapshots {
         let allowed_snapshots = config
             .and_then(|c| c.get("allowedSnapshots"))
             .and_then(serde_json::Value::as_object)
-            .and_then(Self::compile_allowed_snapshots)
+            .map(Self::compile_allowed_snapshots)
             .unwrap_or_default();
 
         Self(Box::new(NoLargeSnapshotsConfig { max_size, inline_max_size, allowed_snapshots }))
@@ -286,22 +286,20 @@ impl NoLargeSnapshots {
 
     pub fn compile_allowed_snapshots(
         matchers: &serde_json::Map<String, serde_json::Value>,
-    ) -> Option<FxHashMap<CompactStr, Vec<CompactStr>>> {
-        Some(
-            matchers
-                .iter()
-                .map(|(key, value)| {
-                    let serde_json::Value::Array(configs) = value else {
-                        return (CompactStr::from(key.as_str()), vec![]);
-                    };
-
-                    let configs =
-                        configs.iter().filter_map(|c| c.as_str().map(CompactStr::from)).collect();
-
-                    (CompactStr::from(key.as_str()), configs)
-                })
-                .collect(),
-        )
+    ) -> FxHashMap<CompactStr, Vec<CompactStr>> {
+        matchers
+            .iter()
+            .map(|(key, value)| {
+                let serde_json::Value::Array(configs) = value else {
+                    return (CompactStr::from(key.as_str()), vec![]);
+                };
+
+                let configs =
+                    configs.iter().filter_map(|c| c.as_str().map(CompactStr::from)).collect();
+
+                (CompactStr::from(key.as_str()), configs)
+            })
+            .collect()
     }
 }
 
diff --git a/crates/oxc_linter/src/rules/jest/no_restricted_jest_methods.rs b/crates/oxc_linter/src/rules/jest/no_restricted_jest_methods.rs
index d3901c6dd8ce1..e964499fe6e2c 100644
--- a/crates/oxc_linter/src/rules/jest/no_restricted_jest_methods.rs
+++ b/crates/oxc_linter/src/rules/jest/no_restricted_jest_methods.rs
@@ -66,7 +66,7 @@ impl Rule for NoRestrictedJestMethods {
         let restricted_jest_methods = &value
             .get(0)
             .and_then(serde_json::Value::as_object)
-            .and_then(Self::compile_restricted_jest_methods)
+            .map(Self::compile_restricted_jest_methods)
             .unwrap_or_default();
 
         Self(Box::new(NoRestrictedJestMethodsConfig {
@@ -138,15 +138,13 @@ impl NoRestrictedJestMethods {
 
     pub fn compile_restricted_jest_methods(
         matchers: &serde_json::Map<String, serde_json::Value>,
-    ) -> Option<FxHashMap<String, String>> {
-        Some(
-            matchers
-                .iter()
-                .map(|(key, value)| {
-                    (String::from(key), String::from(value.as_str().unwrap_or_default()))
-                })
-                .collect(),
-        )
+    ) -> FxHashMap<String, String> {
+        matchers
+            .iter()
+            .map(|(key, value)| {
+                (String::from(key), String::from(value.as_str().unwrap_or_default()))
+            })
+            .collect()
     }
 }
 
diff --git a/crates/oxc_linter/src/rules/jest/no_restricted_matchers.rs b/crates/oxc_linter/src/rules/jest/no_restricted_matchers.rs
index 495f41c83a41b..a646a58cfe1b9 100644
--- a/crates/oxc_linter/src/rules/jest/no_restricted_matchers.rs
+++ b/crates/oxc_linter/src/rules/jest/no_restricted_matchers.rs
@@ -82,7 +82,7 @@ impl Rule for NoRestrictedMatchers {
         let restricted_matchers = &value
             .get(0)
             .and_then(serde_json::Value::as_object)
-            .and_then(Self::compile_restricted_matchers)
+            .map(Self::compile_restricted_matchers)
             .unwrap_or_default();
 
         Self(Box::new(NoRestrictedMatchersConfig {
@@ -152,15 +152,13 @@ impl NoRestrictedMatchers {
 
     pub fn compile_restricted_matchers(
         matchers: &serde_json::Map<String, serde_json::Value>,
-    ) -> Option<FxHashMap<String, String>> {
-        Some(
-            matchers
-                .iter()
-                .map(|(key, value)| {
-                    (String::from(key), String::from(value.as_str().unwrap_or_default()))
-                })
-                .collect(),
-        )
+    ) -> FxHashMap<String, String> {
+        matchers
+            .iter()
+            .map(|(key, value)| {
+                (String::from(key), String::from(value.as_str().unwrap_or_default()))
+            })
+            .collect()
     }
 }
 
diff --git a/crates/oxc_linter/src/tester.rs b/crates/oxc_linter/src/tester.rs
index 87d3725e6d16f..6b40197b1bcd7 100644
--- a/crates/oxc_linter/src/tester.rs
+++ b/crates/oxc_linter/src/tester.rs
@@ -493,8 +493,7 @@ impl Tester {
                     })
                     .with_plugins(self.plugins)
                     .with_rule(rule, AllowWarnDeny::Warn)
-                    .build()
-                    .unwrap(),
+                    .build(),
                 FxHashMap::default(),
             ),
         )
diff --git a/crates/oxc_regular_expression/src/ast_impl/visit.rs b/crates/oxc_regular_expression/src/ast_impl/visit.rs
index 3c158278facba..bacb4759ef142 100644
--- a/crates/oxc_regular_expression/src/ast_impl/visit.rs
+++ b/crates/oxc_regular_expression/src/ast_impl/visit.rs
@@ -1,6 +1,6 @@
+#![expect(clippy::trivially_copy_pass_by_ref)]
 // NOTE: For now, this file is implemented by hand for convenience.
 // But like `oxc_ast`, this should be generated by `tasks/ast_tools` in the future.
-
 use oxc_span::{GetSpan, Span};
 
 use crate::ast::{
diff --git a/crates/oxc_semantic/src/scoping.rs b/crates/oxc_semantic/src/scoping.rs
index 8496b1df2b67b..cb7bed92c65d8 100644
--- a/crates/oxc_semantic/src/scoping.rs
+++ b/crates/oxc_semantic/src/scoping.rs
@@ -451,6 +451,7 @@ impl Scoping {
     /// Get the root [`Program`] scope id.
     ///
     /// [`Program`]: oxc_ast::ast::Program
+    #[expect(clippy::unused_self)]
     #[inline]
     pub const fn root_scope_id(&self) -> ScopeId {
         Self::ROOT_SCOPE_ID
diff --git a/crates/oxc_semantic/tests/integration/scopes.rs b/crates/oxc_semantic/tests/integration/scopes.rs
index 113b43af3dad2..1fb30988dc1c5 100644
--- a/crates/oxc_semantic/tests/integration/scopes.rs
+++ b/crates/oxc_semantic/tests/integration/scopes.rs
@@ -6,7 +6,7 @@ use crate::util::{Expect, SemanticTester};
 #[test]
 fn test_only_program() {
     let tester = SemanticTester::js("let x = 1;");
-    tester.has_root_symbol("x").is_in_scope(ScopeFlags::Top).test();
+    tester.has_root_symbol("x").in_scope(ScopeFlags::Top).test();
 
     let semantic = tester.build();
     let scopes = semantic.scoping();
@@ -38,7 +38,7 @@ fn test_top_level_strict() {
     "#,
     )
     .has_root_symbol("foo")
-    .is_in_scope(ScopeFlags::Top | ScopeFlags::StrictMode)
+    .in_scope(ScopeFlags::Top | ScopeFlags::StrictMode)
     // .expect(expect_strict)
     .test();
 
@@ -51,7 +51,7 @@ fn test_top_level_strict() {
     ",
     )
     .has_root_symbol("foo")
-    .is_in_scope(ScopeFlags::Top | ScopeFlags::StrictMode)
+    .in_scope(ScopeFlags::Top | ScopeFlags::StrictMode)
     .test();
 
     // Script with top-level "use strict"
@@ -65,7 +65,7 @@ fn test_top_level_strict() {
     )
     .with_module(false)
     .has_root_symbol("foo")
-    .is_in_scope(ScopeFlags::Top | ScopeFlags::StrictMode)
+    .in_scope(ScopeFlags::Top | ScopeFlags::StrictMode)
     .test();
 
     // Script without top-level "use strict"
@@ -78,8 +78,8 @@ fn test_top_level_strict() {
     )
     .with_module(false)
     .has_root_symbol("foo")
-    .is_in_scope(ScopeFlags::Top)
-    .is_not_in_scope(ScopeFlags::StrictMode)
+    .in_scope(ScopeFlags::Top)
+    .not_in_scope(ScopeFlags::StrictMode)
     .test();
 }
 
@@ -98,7 +98,7 @@ fn test_function_level_strict() {
 
     tester
         .has_some_symbol("x")
-        .is_in_scope(ScopeFlags::StrictMode | ScopeFlags::Function)
+        .in_scope(ScopeFlags::StrictMode | ScopeFlags::Function)
         .expect(|(semantic, symbol_id)| -> Result<(), &'static str> {
             let scope_id = semantic.symbol_scope(symbol_id);
             let Some(parent_scope_id) = semantic.scoping().scope_parent_id(scope_id) else {
@@ -112,7 +112,7 @@ fn test_function_level_strict() {
             }
         })
         .test();
-    tester.has_some_symbol("foo").is_not_in_scope(ScopeFlags::StrictMode).test();
+    tester.has_some_symbol("foo").not_in_scope(ScopeFlags::StrictMode).test();
 }
 
 #[test]
@@ -219,7 +219,7 @@ fn var_hoisting() {
     )
     .has_root_symbol("e")
     // `e` was hoisted to the top scope so the symbol's scope is also the top scope
-    .is_in_scope(ScopeFlags::Top)
+    .in_scope(ScopeFlags::Top)
     .test();
 }
 
diff --git a/crates/oxc_semantic/tests/integration/util/symbol_tester.rs b/crates/oxc_semantic/tests/integration/util/symbol_tester.rs
index f3efe642b3748..30b75ad77867a 100644
--- a/crates/oxc_semantic/tests/integration/util/symbol_tester.rs
+++ b/crates/oxc_semantic/tests/integration/util/symbol_tester.rs
@@ -218,7 +218,7 @@ impl<'a> SymbolTester<'a> {
         self
     }
 
-    pub fn is_in_scope(mut self, expected_flags: ScopeFlags) -> Self {
+    pub fn in_scope(mut self, expected_flags: ScopeFlags) -> Self {
         let target_name: &str = self.target_symbol_name.as_ref();
         self.test_result = match self.test_result {
             Ok(symbol_id) => {
@@ -237,7 +237,7 @@ impl<'a> SymbolTester<'a> {
         self
     }
 
-    pub fn is_not_in_scope(mut self, excluded_flags: ScopeFlags) -> Self {
+    pub fn not_in_scope(mut self, excluded_flags: ScopeFlags) -> Self {
         let target_name: &str = self.target_symbol_name.as_ref();
         self.test_result = match self.test_result {
             Ok(symbol_id) => {
diff --git a/crates/oxc_span/src/atom.rs b/crates/oxc_span/src/atom.rs
index 60f31d727b7dd..b7094b81d9e7c 100644
--- a/crates/oxc_span/src/atom.rs
+++ b/crates/oxc_span/src/atom.rs
@@ -58,7 +58,7 @@ impl<'a> Atom<'a> {
 
     /// Convert this [`Atom`] into a [`CompactStr`] without consuming `self`.
     #[inline]
-    pub fn to_compact_str(&self) -> CompactStr {
+    pub fn to_compact_str(self) -> CompactStr {
         CompactStr::new(self.as_str())
     }
 }
diff --git a/crates/oxc_syntax/src/node.rs b/crates/oxc_syntax/src/node.rs
index 671bbbaf104c5..ba48627df5a7c 100644
--- a/crates/oxc_syntax/src/node.rs
+++ b/crates/oxc_syntax/src/node.rs
@@ -74,25 +74,25 @@ bitflags! {
 impl NodeFlags {
     /// Returns `true` if this node has a JSDoc comment attached to it.
     #[inline]
-    pub fn has_jsdoc(&self) -> bool {
+    pub fn has_jsdoc(self) -> bool {
         self.contains(Self::JSDoc)
     }
 
     /// Returns `true` if this node is inside a class.
     #[inline]
-    pub fn has_class(&self) -> bool {
+    pub fn has_class(self) -> bool {
         self.contains(Self::Class)
     }
 
     /// Returns `true` if this function has a yield statement.
     #[inline]
-    pub fn has_yield(&self) -> bool {
+    pub fn has_yield(self) -> bool {
         self.contains(Self::HasYield)
     }
 
     /// Returns `true` if this function has an export specifier.
     #[inline]
-    pub fn has_export_specifier(&self) -> bool {
+    pub fn has_export_specifier(self) -> bool {
         self.contains(Self::ExportSpecifier)
     }
 }
diff --git a/crates/oxc_syntax/src/number.rs b/crates/oxc_syntax/src/number.rs
index d531277bcba40..503110a53d9ff 100644
--- a/crates/oxc_syntax/src/number.rs
+++ b/crates/oxc_syntax/src/number.rs
@@ -16,7 +16,7 @@ pub enum NumberBase {
 }
 
 impl NumberBase {
-    pub fn is_base_10(&self) -> bool {
+    pub fn is_base_10(self) -> bool {
         matches!(self, Self::Float | Self::Decimal)
     }
 }
@@ -32,8 +32,8 @@ pub enum BigintBase {
 }
 
 impl BigintBase {
-    pub fn is_base_10(&self) -> bool {
-        self == &Self::Decimal
+    pub fn is_base_10(self) -> bool {
+        self == Self::Decimal
     }
 }
 
diff --git a/crates/oxc_syntax/src/operator.rs b/crates/oxc_syntax/src/operator.rs
index 2eede2b4e33dc..454462f0609bb 100644
--- a/crates/oxc_syntax/src/operator.rs
+++ b/crates/oxc_syntax/src/operator.rs
@@ -130,7 +130,7 @@ impl AssignmentOperator {
     /// Get the string representation of this operator.
     ///
     /// This is the same as how the operator appears in source code.
-    pub fn as_str(&self) -> &'static str {
+    pub fn as_str(self) -> &'static str {
         match self {
             Self::Assign => "=",
             Self::Addition => "+=",
@@ -338,7 +338,7 @@ impl BinaryOperator {
     }
 
     /// The string representation of this operator as it appears in source code.
-    pub fn as_str(&self) -> &'static str {
+    pub fn as_str(self) -> &'static str {
         match self {
             Self::Equality => "==",
             Self::Inequality => "!=",
@@ -368,7 +368,7 @@ impl BinaryOperator {
     /// Get the operator that has a lower precedence than this operator by a
     /// single level. Use [`BinaryOperator::precedence`] to get the operator
     /// with a higher precedence.
-    pub fn lower_precedence(&self) -> Precedence {
+    pub fn lower_precedence(self) -> Precedence {
         match self {
             Self::BitwiseOR => Precedence::LogicalAnd,
             Self::BitwiseXOR => Precedence::BitwiseOr,
@@ -449,7 +449,7 @@ impl LogicalOperator {
     }
 
     /// Get the string representation of this operator as it appears in source code.
-    pub fn as_str(&self) -> &'static str {
+    pub fn as_str(self) -> &'static str {
         match self {
             Self::Or => "||",
             Self::And => "&&",
@@ -460,7 +460,7 @@ impl LogicalOperator {
     /// Get the operator that has a lower precedence than this operator by a
     /// single level. Use [`BinaryOperator::precedence`] to get the operator
     /// with a higher precedence.
-    pub fn lower_precedence(&self) -> Precedence {
+    pub fn lower_precedence(self) -> Precedence {
         match self {
             Self::Or => Precedence::NullishCoalescing,
             Self::And => Precedence::LogicalOr,
@@ -560,7 +560,7 @@ impl UnaryOperator {
     }
 
     /// Get the string representation of this operator as it appears in source code.
-    pub fn as_str(&self) -> &'static str {
+    pub fn as_str(self) -> &'static str {
         match self {
             Self::UnaryPlus => "+",
             Self::UnaryNegation => "-",
@@ -588,7 +588,7 @@ pub enum UpdateOperator {
 
 impl UpdateOperator {
     /// Get the string representation of this operator as it appears in source code.
-    pub fn as_str(&self) -> &'static str {
+    pub fn as_str(self) -> &'static str {
         match self {
             Self::Increment => "++",
             Self::Decrement => "--",
diff --git a/crates/oxc_syntax/src/precedence.rs b/crates/oxc_syntax/src/precedence.rs
index 6f9d0135b24ab..76dcf54703e4f 100644
--- a/crates/oxc_syntax/src/precedence.rs
+++ b/crates/oxc_syntax/src/precedence.rs
@@ -43,11 +43,11 @@ pub enum Precedence {
 }
 
 impl Precedence {
-    pub fn is_right_associative(&self) -> bool {
+    pub fn is_right_associative(self) -> bool {
         matches!(self, Self::Exponentiation | Self::Conditional | Self::Assign)
     }
 
-    pub fn is_left_associative(&self) -> bool {
+    pub fn is_left_associative(self) -> bool {
         matches!(
             self,
             Self::Lowest
diff --git a/crates/oxc_syntax/src/reference.rs b/crates/oxc_syntax/src/reference.rs
index 9743352d82401..735fd188a49a4 100644
--- a/crates/oxc_syntax/src/reference.rs
+++ b/crates/oxc_syntax/src/reference.rs
@@ -159,43 +159,43 @@ impl ReferenceFlags {
 
     /// The identifier is read from. It may also be written to.
     #[inline]
-    pub const fn is_read(&self) -> bool {
+    pub const fn is_read(self) -> bool {
         self.intersects(Self::Read)
     }
 
     /// The identifier is only read from.
     #[inline]
-    pub const fn is_read_only(&self) -> bool {
+    pub const fn is_read_only(self) -> bool {
         !self.contains(Self::Write)
     }
 
     /// The identifier is written to. It may also be read from.
     #[inline]
-    pub const fn is_write(&self) -> bool {
+    pub const fn is_write(self) -> bool {
         self.intersects(Self::Write)
     }
 
     /// The identifier is only written to. It is not read from in this reference.
     #[inline]
-    pub const fn is_write_only(&self) -> bool {
+    pub const fn is_write_only(self) -> bool {
         !self.contains(Self::Read)
     }
 
     /// The identifier is both read from and written to, e.g `a += 1`.
     #[inline]
-    pub fn is_read_write(&self) -> bool {
+    pub fn is_read_write(self) -> bool {
         self.contains(Self::Read | Self::Write)
     }
 
     /// Checks if the reference is a value being used in a type context.
     #[inline]
-    pub fn is_value_as_type(&self) -> bool {
+    pub fn is_value_as_type(self) -> bool {
         self.contains(Self::ValueAsType)
     }
 
     /// The identifier is used in a type definition.
     #[inline]
-    pub const fn is_type(&self) -> bool {
+    pub const fn is_type(self) -> bool {
         self.contains(Self::Type)
     }
 
@@ -205,7 +205,7 @@ impl ReferenceFlags {
     }
 
     #[inline]
-    pub const fn is_value(&self) -> bool {
+    pub const fn is_value(self) -> bool {
         self.intersects(Self::Value)
     }
 }
diff --git a/crates/oxc_syntax/src/scope.rs b/crates/oxc_syntax/src/scope.rs
index 2786d6508a416..a2554f3ed276c 100644
--- a/crates/oxc_syntax/src/scope.rs
+++ b/crates/oxc_syntax/src/scope.rs
@@ -100,71 +100,71 @@ impl ScopeFlags {
     }
 
     #[inline]
-    pub fn is_strict_mode(&self) -> bool {
+    pub fn is_strict_mode(self) -> bool {
         self.contains(Self::StrictMode)
     }
 
     #[inline]
-    pub fn is_block(&self) -> bool {
-        self.is_empty() || *self == Self::StrictMode
+    pub fn is_block(self) -> bool {
+        self.is_empty() || self == Self::StrictMode
     }
 
     #[inline]
-    pub fn is_top(&self) -> bool {
+    pub fn is_top(self) -> bool {
         self.contains(Self::Top)
     }
 
     #[inline]
-    pub fn is_function(&self) -> bool {
+    pub fn is_function(self) -> bool {
         self.contains(Self::Function)
     }
 
     #[inline]
-    pub fn is_arrow(&self) -> bool {
+    pub fn is_arrow(self) -> bool {
         self.contains(Self::Arrow)
     }
 
     #[inline]
-    pub fn is_constructor(&self) -> bool {
+    pub fn is_constructor(self) -> bool {
         self.contains(Self::Constructor)
     }
 
     #[inline]
-    pub fn is_class_static_block(&self) -> bool {
+    pub fn is_class_static_block(self) -> bool {
         self.contains(Self::ClassStaticBlock)
     }
 
     #[inline]
-    pub fn is_ts_module_block(&self) -> bool {
+    pub fn is_ts_module_block(self) -> bool {
         self.contains(Self::TsModuleBlock)
     }
 
     #[inline]
-    pub fn is_var(&self) -> bool {
+    pub fn is_var(self) -> bool {
         self.intersects(Self::Var)
     }
 
     #[inline]
-    pub fn is_set_accessor(&self) -> bool {
+    pub fn is_set_accessor(self) -> bool {
         self.contains(Self::SetAccessor)
     }
 
     #[inline]
-    pub fn is_set_or_get_accessor(&self) -> bool {
+    pub fn is_set_or_get_accessor(self) -> bool {
         self.intersects(Self::SetAccessor | Self::GetAccessor)
     }
 
     #[inline]
-    pub fn is_catch_clause(&self) -> bool {
+    pub fn is_catch_clause(self) -> bool {
         self.contains(Self::CatchClause)
     }
 
-    pub fn is_ts_conditional(&self) -> bool {
+    pub fn is_ts_conditional(self) -> bool {
         self.contains(Self::TsConditional)
     }
 
     #[inline]
-    pub fn contains_direct_eval(&self) -> bool {
+    pub fn contains_direct_eval(self) -> bool {
         self.contains(Self::DirectEval)
     }
 }
diff --git a/crates/oxc_syntax/src/symbol.rs b/crates/oxc_syntax/src/symbol.rs
index c2d7bf7b5ff7d..da0eaea4950bd 100644
--- a/crates/oxc_syntax/src/symbol.rs
+++ b/crates/oxc_syntax/src/symbol.rs
@@ -172,118 +172,118 @@ bitflags! {
 
 impl SymbolFlags {
     #[inline]
-    pub fn is_variable(&self) -> bool {
+    pub fn is_variable(self) -> bool {
         self.intersects(Self::Variable)
     }
 
     #[inline]
-    pub fn is_type_parameter(&self) -> bool {
+    pub fn is_type_parameter(self) -> bool {
         self.contains(Self::TypeParameter)
     }
 
     /// If true, then the symbol is a type, such as a TypeAlias, Interface, or Enum
     #[inline]
-    pub fn is_type(&self) -> bool {
+    pub fn is_type(self) -> bool {
         self.intersects((Self::TypeImport | Self::Type) - Self::Value)
     }
 
     /// If true, then the symbol is a value, such as a Variable, Function, or Class
     #[inline]
-    pub fn is_value(&self) -> bool {
+    pub fn is_value(self) -> bool {
         self.intersects(Self::Value | Self::Import)
     }
 
     #[inline]
-    pub fn is_const_variable(&self) -> bool {
+    pub fn is_const_variable(self) -> bool {
         self.contains(Self::ConstVariable)
     }
 
     /// Returns `true` if this symbol is a function declaration or expression.
     #[inline]
-    pub fn is_function(&self) -> bool {
+    pub fn is_function(self) -> bool {
         self.contains(Self::Function)
     }
 
     #[inline]
-    pub fn is_class(&self) -> bool {
+    pub fn is_class(self) -> bool {
         self.contains(Self::Class)
     }
 
     #[inline]
-    pub fn is_interface(&self) -> bool {
+    pub fn is_interface(self) -> bool {
         self.contains(Self::Interface)
     }
 
     #[inline]
-    pub fn is_type_alias(&self) -> bool {
+    pub fn is_type_alias(self) -> bool {
         self.contains(Self::TypeAlias)
     }
 
     #[inline]
-    pub fn is_enum(&self) -> bool {
+    pub fn is_enum(self) -> bool {
         self.intersects(Self::Enum)
     }
 
     #[inline]
-    pub fn is_const_enum(&self) -> bool {
+    pub fn is_const_enum(self) -> bool {
         self.intersects(Self::ConstEnum)
     }
 
     #[inline]
-    pub fn is_enum_member(&self) -> bool {
+    pub fn is_enum_member(self) -> bool {
         self.contains(Self::EnumMember)
     }
 
     #[inline]
-    pub fn is_catch_variable(&self) -> bool {
+    pub fn is_catch_variable(self) -> bool {
         self.contains(Self::CatchVariable)
     }
 
     #[inline]
-    pub fn is_function_scoped_declaration(&self) -> bool {
+    pub fn is_function_scoped_declaration(self) -> bool {
         self.contains(Self::FunctionScopedVariable)
     }
 
     #[inline]
-    pub fn is_import(&self) -> bool {
+    pub fn is_import(self) -> bool {
         self.intersects(Self::Import | Self::TypeImport)
     }
 
     #[inline]
-    pub fn is_type_import(&self) -> bool {
+    pub fn is_type_import(self) -> bool {
         self.contains(Self::TypeImport)
     }
 
     #[inline]
-    pub fn is_ambient(&self) -> bool {
+    pub fn is_ambient(self) -> bool {
         self.contains(Self::Ambient)
     }
 
     #[inline]
-    pub fn is_namespace_module(&self) -> bool {
+    pub fn is_namespace_module(self) -> bool {
         self.contains(Self::NamespaceModule)
     }
 
     #[inline]
-    pub fn is_value_module(&self) -> bool {
+    pub fn is_value_module(self) -> bool {
         self.contains(Self::ValueModule)
     }
 
     /// If true, then the symbol can be referenced by a type reference
     #[inline]
-    pub fn can_be_referenced_by_type(&self) -> bool {
+    pub fn can_be_referenced_by_type(self) -> bool {
         self.intersects(Self::Type | Self::TypeImport | Self::Import | Self::Namespace)
     }
 
     /// If true, then the symbol can be referenced by a value reference
     #[inline]
-    pub fn can_be_referenced_by_value(&self) -> bool {
+    pub fn can_be_referenced_by_value(self) -> bool {
         self.is_value()
     }
 
     /// If true, then the symbol can be referenced by a value_as_type reference
     #[inline]
-    pub fn can_be_referenced_by_value_as_type(&self) -> bool {
+    pub fn can_be_referenced_by_value_as_type(self) -> bool {
         self.intersects(Self::Value | Self::Import | Self::Function | Self::TypeImport)
     }
 }
diff --git a/crates/oxc_transformer/src/options/module.rs b/crates/oxc_transformer/src/options/module.rs
index 9c56321a22275..6a8ca0a2d7a79 100644
--- a/crates/oxc_transformer/src/options/module.rs
+++ b/crates/oxc_transformer/src/options/module.rs
@@ -16,18 +16,18 @@ use crate::options::babel::BabelModule;
 pub enum Module {
     #[default]
     Preserve,
-    ESM,
+    Esm,
     CommonJS,
 }
 
 impl Module {
     /// Check if the module is ECMAScript Module(ESM).
-    pub fn is_esm(&self) -> bool {
-        matches!(self, Self::ESM)
+    pub fn is_esm(self) -> bool {
+        matches!(self, Self::Esm)
     }
 
     /// Check if the module is CommonJS.
-    pub fn is_commonjs(&self) -> bool {
+    pub fn is_commonjs(self) -> bool {
         matches!(self, Self::CommonJS)
     }
 }
diff --git a/crates/oxc_transformer/src/typescript/options.rs b/crates/oxc_transformer/src/typescript/options.rs
index 8f562c52af648..b37a2bbe1fde1 100644
--- a/crates/oxc_transformer/src/typescript/options.rs
+++ b/crates/oxc_transformer/src/typescript/options.rs
@@ -123,7 +123,7 @@ pub enum RewriteExtensionsMode {
 }
 
 impl RewriteExtensionsMode {
-    pub fn is_remove(&self) -> bool {
+    pub fn is_remove(self) -> bool {
         matches!(self, Self::Remove)
     }
 }
diff --git a/crates/oxc_transformer_plugins/src/inject_global_variables.rs b/crates/oxc_transformer_plugins/src/inject_global_variables.rs
index 28e56cc9f190d..fe38c116d4c2f 100644
--- a/crates/oxc_transformer_plugins/src/inject_global_variables.rs
+++ b/crates/oxc_transformer_plugins/src/inject_global_variables.rs
@@ -251,7 +251,7 @@ impl<'a> InjectGlobalVariables<'a> {
         }
     }
 
-    fn replace_dot_defines(&mut self, expr: &mut Expression<'a>, ctx: &mut TraverseCtx<'a>) {
+    fn replace_dot_defines(&mut self, expr: &mut Expression<'a>, ctx: &TraverseCtx<'a>) {
         if let Expression::StaticMemberExpression(member) = expr {
             for DotDefineState { dot_define, value_atom } in &mut self.dot_defines {
                 if ReplaceGlobalDefines::is_dot_define(
diff --git a/crates/oxc_transformer_plugins/src/replace_global_defines.rs b/crates/oxc_transformer_plugins/src/replace_global_defines.rs
index a7803fe6f1af5..42dafb21be929 100644
--- a/crates/oxc_transformer_plugins/src/replace_global_defines.rs
+++ b/crates/oxc_transformer_plugins/src/replace_global_defines.rs
@@ -344,7 +344,7 @@ impl<'a> ReplaceGlobalDefines<'a> {
     fn replace_define_with_assignment_expr(
         &self,
         node: &mut AssignmentExpression<'a>,
-        ctx: &mut TraverseCtx<'a>,
+        ctx: &TraverseCtx<'a>,
     ) -> bool {
         let new_left = node
             .left
@@ -369,7 +369,7 @@ impl<'a> ReplaceGlobalDefines<'a> {
         false
     }
 
-    fn replace_dot_defines(&self, expr: &mut Expression<'a>, ctx: &mut TraverseCtx<'a>) -> bool {
+    fn replace_dot_defines(&self, expr: &mut Expression<'a>, ctx: &TraverseCtx<'a>) -> bool {
         match expr {
             Expression::ChainExpression(chain) => {
                 let Some(new_expr) =
@@ -417,7 +417,7 @@ impl<'a> ReplaceGlobalDefines<'a> {
 
     fn replace_dot_computed_member_expr(
         &self,
-        ctx: &mut TraverseCtx<'a>,
+        ctx: &TraverseCtx<'a>,
         member: &ComputedMemberExpression<'a>,
     ) -> Option<Expression<'a>> {
         for dot_define in &self.config.0.dot {
@@ -436,7 +436,7 @@ impl<'a> ReplaceGlobalDefines<'a> {
 
     fn replace_dot_static_member_expr(
         &self,
-        ctx: &mut TraverseCtx<'a>,
+        ctx: &TraverseCtx<'a>,
         member: &StaticMemberExpression<'a>,
     ) -> Option<Expression<'a>> {
         for dot_define in &self.config.0.dot {
@@ -536,7 +536,7 @@ impl<'a> ReplaceGlobalDefines<'a> {
     }
 
     pub fn is_dot_define<'b>(
-        ctx: &mut TraverseCtx<'a>,
+        ctx: &TraverseCtx<'a>,
         dot_define: &DotDefine,
         member: DotDefineMemberExpression<'b, 'a>,
     ) -> bool {
diff --git a/crates/oxc_traverse/scripts/lib/ancestor.mjs b/crates/oxc_traverse/scripts/lib/ancestor.mjs
index f0726705b4e81..91602f490f19c 100644
--- a/crates/oxc_traverse/scripts/lib/ancestor.mjs
+++ b/crates/oxc_traverse/scripts/lib/ancestor.mjs
@@ -116,6 +116,7 @@ export default function generateAncestorsCode(types) {
       clippy::cast_ptr_alignment,
       clippy::elidable_lifetime_names,
       clippy::ptr_as_ptr,
+      clippy::ref_option,
       clippy::undocumented_unsafe_blocks,
     )]
 
diff --git a/crates/oxc_traverse/src/generated/ancestor.rs b/crates/oxc_traverse/src/generated/ancestor.rs
index a23a339992f8e..45c5decf8e65c 100644
--- a/crates/oxc_traverse/src/generated/ancestor.rs
+++ b/crates/oxc_traverse/src/generated/ancestor.rs
@@ -6,6 +6,7 @@
     clippy::cast_ptr_alignment,
     clippy::elidable_lifetime_names,
     clippy::ptr_as_ptr,
+    clippy::ref_option,
     clippy::undocumented_unsafe_blocks
 )]
 
diff --git a/napi/playground/src/lib.rs b/napi/playground/src/lib.rs
index cec2a6eaf20e4..8fc55978ddb89 100644
--- a/napi/playground/src/lib.rs
+++ b/napi/playground/src/lib.rs
@@ -285,8 +285,7 @@ impl Oxc {
         if run_options.lint.unwrap_or_default() && self.diagnostics.is_empty() {
             let semantic_ret = SemanticBuilder::new().with_cfg(true).build(program);
             let semantic = Rc::new(semantic_ret.semantic);
-            let lint_config =
-                ConfigStoreBuilder::default().build().expect("Failed to build config store");
+            let lint_config = ConfigStoreBuilder::default().build();
             let linter_ret = Linter::new(
                 LintOptions::default(),
                 ConfigStore::new(lint_config, FxHashMap::default()),
diff --git a/tasks/ast_tools/src/generators/ast_builder.rs b/tasks/ast_tools/src/generators/ast_builder.rs
index 10ffd31f86622..ec2e35438919b 100644
--- a/tasks/ast_tools/src/generators/ast_builder.rs
+++ b/tasks/ast_tools/src/generators/ast_builder.rs
@@ -69,7 +69,11 @@ impl Generator for AstBuilderGenerator {
             //! AST node factories
 
             //!@@line_break
-            #![expect(clippy::default_trait_access, clippy::inconsistent_struct_constructor)]
+            #![expect(
+                clippy::default_trait_access,
+                clippy::inconsistent_struct_constructor,
+                clippy::unused_self,
+            )]
 
             ///@@line_break
             use std::cell::Cell;
diff --git a/tasks/ast_tools/src/generators/visit.rs b/tasks/ast_tools/src/generators/visit.rs
index 4de7d94429d27..2bcdb01426b21 100644
--- a/tasks/ast_tools/src/generators/visit.rs
+++ b/tasks/ast_tools/src/generators/visit.rs
@@ -240,7 +240,15 @@ fn generate_output(
         //! * [rustc visitor](https://github.com/rust-lang/rust/blob/1.82.0/compiler/rustc_ast/src/visit.rs)
 
         //!@@line_break
-        #![expect(unused_variables, clippy::semicolon_if_nothing_returned, clippy::match_same_arms)]
+        #![expect(
+            unused_variables,
+            clippy::match_same_arms,
+            clippy::semicolon_if_nothing_returned,
+        )]
+        #![allow(
+            clippy::needless_pass_by_ref_mut,
+            clippy::trivially_copy_pass_by_ref,
+        )]
 
         ///@@line_break
         use std::cell::Cell;
diff --git a/tasks/benchmark/benches/linter.rs b/tasks/benchmark/benches/linter.rs
index ff859ea51ad57..2ab62b5576de5 100644
--- a/tasks/benchmark/benches/linter.rs
+++ b/tasks/benchmark/benches/linter.rs
@@ -41,8 +41,7 @@ fn bench_linter(criterion: &mut Criterion) {
             let semantic = semantic_ret.semantic;
             let module_record = Arc::new(ModuleRecord::new(path, &ret.module_record, &semantic));
             let semantic = Rc::new(semantic);
-            let lint_config =
-                ConfigStoreBuilder::all().build().expect("Failed to build config store");
+            let lint_config = ConfigStoreBuilder::all().build();
             let linter = Linter::new(
                 LintOptions::default(),
                 ConfigStore::new(lint_config, FxHashMap::default()),
diff --git a/tasks/prettier_conformance/src/options.rs b/tasks/prettier_conformance/src/options.rs
index 29f8c819976ec..0b4c0b649d797 100644
--- a/tasks/prettier_conformance/src/options.rs
+++ b/tasks/prettier_conformance/src/options.rs
@@ -15,7 +15,7 @@ pub enum TestLanguage {
 }
 
 impl TestLanguage {
-    pub fn as_str(&self) -> &'static str {
+    pub fn as_str(self) -> &'static str {
         match self {
             Self::Js => "js",
             Self::Ts => "ts",
@@ -23,7 +23,7 @@ impl TestLanguage {
     }
 
     /// Prettier's test fixtures roots for different languages.
-    pub fn fixtures_roots(&self, base: &Path) -> Vec<PathBuf> {
+    pub fn fixtures_roots(self, base: &Path) -> Vec<PathBuf> {
         match self {
             Self::Js => ["js", "jsx"],
             // There is no `tsx` directory, just check it works with TS