diff --git a/crates/oxc_ecmascript/src/constant_evaluation/mod.rs b/crates/oxc_ecmascript/src/constant_evaluation/mod.rs
index 0c8cc26c7f56f..67e0516d90505 100644
--- a/crates/oxc_ecmascript/src/constant_evaluation/mod.rs
+++ b/crates/oxc_ecmascript/src/constant_evaluation/mod.rs
@@ -32,7 +32,7 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
         // and there are only a very few cases where we can compute a number value, but there could
         // also be side effects. e.g. `void doSomething()` has value NaN, regardless of the behavior
         // of `doSomething()`
-        if value.is_some() && self.expression_may_have_side_efffects(expr) {
+        if value.is_some() && self.expression_may_have_side_effects(expr) {
             None
         } else {
             value
@@ -41,7 +41,7 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
 
     fn get_side_free_string_value(&self, expr: &Expression<'a>) -> Option<Cow<'a, str>> {
         let value = expr.to_js_string();
-        if value.is_some() && !self.expression_may_have_side_efffects(expr) {
+        if value.is_some() && !self.expression_may_have_side_effects(expr) {
             return value;
         }
         None
@@ -49,7 +49,7 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
 
     fn get_side_free_boolean_value(&self, expr: &Expression<'a>) -> Option<bool> {
         let value = self.get_boolean_value(expr);
-        if value.is_some() && !self.expression_may_have_side_efffects(expr) {
+        if value.is_some() && !self.expression_may_have_side_effects(expr) {
             return value;
         }
         None
@@ -57,7 +57,7 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
 
     fn get_side_free_bigint_value(&self, expr: &Expression<'a>) -> Option<BigInt> {
         let value = expr.to_big_int();
-        if value.is_some() && self.expression_may_have_side_efffects(expr) {
+        if value.is_some() && self.expression_may_have_side_effects(expr) {
             None
         } else {
             value
@@ -201,8 +201,8 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
     ) -> Option<ConstantValue<'a>> {
         match operator {
             BinaryOperator::Addition => {
-                if self.expression_may_have_side_efffects(left)
-                    || self.expression_may_have_side_efffects(right)
+                if self.expression_may_have_side_effects(left)
+                    || self.expression_may_have_side_effects(right)
                 {
                     return None;
                 }
@@ -319,7 +319,7 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
                 None
             }
             BinaryOperator::Instanceof => {
-                if self.expression_may_have_side_efffects(left) {
+                if self.expression_may_have_side_effects(left) {
                     return None;
                 }
                 if let Expression::Identifier(right_ident) = right {
@@ -379,21 +379,22 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
                 Some(ConstantValue::String(Cow::Borrowed(s)))
             }
             UnaryOperator::Void => (expr.argument.is_literal()
-                || !self.expression_may_have_side_efffects(&expr.argument))
+                || !self.expression_may_have_side_effects(&expr.argument))
             .then_some(ConstantValue::Undefined),
             UnaryOperator::LogicalNot => self
                 .get_side_free_boolean_value(&expr.argument)
                 .map(|b| !b)
                 .map(ConstantValue::Boolean),
             UnaryOperator::UnaryPlus => {
-                self.eval_to_number(&expr.argument).map(ConstantValue::Number)
+                self.get_side_free_number_value(&expr.argument).map(ConstantValue::Number)
             }
             UnaryOperator::UnaryNegation => match ValueType::from(&expr.argument) {
-                ValueType::BigInt => {
-                    self.eval_to_big_int(&expr.argument).map(|v| -v).map(ConstantValue::BigInt)
-                }
+                ValueType::BigInt => self
+                    .get_side_free_bigint_value(&expr.argument)
+                    .map(|v| -v)
+                    .map(ConstantValue::BigInt),
                 ValueType::Number => self
-                    .eval_to_number(&expr.argument)
+                    .get_side_free_number_value(&expr.argument)
                     .map(|v| if v.is_nan() { v } else { -v })
                     .map(ConstantValue::Number),
                 ValueType::Undefined => Some(ConstantValue::Number(f64::NAN)),
@@ -401,12 +402,13 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
                 _ => None,
             },
             UnaryOperator::BitwiseNot => match ValueType::from(&expr.argument) {
-                ValueType::BigInt => {
-                    self.eval_to_big_int(&expr.argument).map(|v| !v).map(ConstantValue::BigInt)
-                }
+                ValueType::BigInt => self
+                    .get_side_free_bigint_value(&expr.argument)
+                    .map(|v| !v)
+                    .map(ConstantValue::BigInt),
                 #[expect(clippy::cast_lossless)]
                 _ => self
-                    .eval_to_number(&expr.argument)
+                    .get_side_free_number_value(&expr.argument)
                     .map(|v| (!v.to_int_32()) as f64)
                     .map(ConstantValue::Number),
             },
@@ -423,7 +425,7 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
                 if let Some(ConstantValue::String(s)) = self.eval_expression(&expr.object) {
                     Some(ConstantValue::Number(s.encode_utf16().count().to_f64().unwrap()))
                 } else {
-                    if self.expression_may_have_side_efffects(&expr.object) {
+                    if self.expression_may_have_side_effects(&expr.object) {
                         return None;
                     }
                     if let Expression::ArrayExpression(arr) = &expr.object {
@@ -446,7 +448,7 @@ pub trait ConstantEvaluation<'a>: MayHaveSideEffects {
                 if let Some(ConstantValue::String(s)) = self.eval_expression(&expr.object) {
                     Some(ConstantValue::Number(s.encode_utf16().count().to_f64().unwrap()))
                 } else {
-                    if self.expression_may_have_side_efffects(&expr.object) {
+                    if self.expression_may_have_side_effects(&expr.object) {
                         return None;
                     }
                     if let Expression::ArrayExpression(arr) = &expr.object {
diff --git a/crates/oxc_ecmascript/src/side_effects/may_have_side_effects.rs b/crates/oxc_ecmascript/src/side_effects/may_have_side_effects.rs
index 99452006d8ac2..403524d7b1421 100644
--- a/crates/oxc_ecmascript/src/side_effects/may_have_side_effects.rs
+++ b/crates/oxc_ecmascript/src/side_effects/may_have_side_effects.rs
@@ -6,7 +6,7 @@ use oxc_ast::ast::*;
 pub trait MayHaveSideEffects {
     fn is_global_reference(&self, ident: &IdentifierReference<'_>) -> bool;
 
-    fn expression_may_have_side_efffects(&self, e: &Expression<'_>) -> bool {
+    fn expression_may_have_side_effects(&self, e: &Expression<'_>) -> bool {
         match e {
             // Reference read can have a side effect.
             Expression::Identifier(ident) => match ident.name.as_str() {
@@ -24,19 +24,19 @@ pub trait MayHaveSideEffects {
             | Expression::ArrowFunctionExpression(_)
             | Expression::FunctionExpression(_) => false,
             Expression::TemplateLiteral(template) => {
-                template.expressions.iter().any(|e| self.expression_may_have_side_efffects(e))
+                template.expressions.iter().any(|e| self.expression_may_have_side_effects(e))
             }
             Expression::UnaryExpression(e) => self.unary_expression_may_have_side_effects(e),
             Expression::ParenthesizedExpression(e) => {
-                self.expression_may_have_side_efffects(&e.expression)
+                self.expression_may_have_side_effects(&e.expression)
             }
             Expression::ConditionalExpression(e) => {
-                self.expression_may_have_side_efffects(&e.test)
-                    || self.expression_may_have_side_efffects(&e.consequent)
-                    || self.expression_may_have_side_efffects(&e.alternate)
+                self.expression_may_have_side_effects(&e.test)
+                    || self.expression_may_have_side_effects(&e.consequent)
+                    || self.expression_may_have_side_effects(&e.alternate)
             }
             Expression::SequenceExpression(e) => {
-                e.expressions.iter().any(|e| self.expression_may_have_side_efffects(e))
+                e.expressions.iter().any(|e| self.expression_may_have_side_effects(e))
             }
             Expression::BinaryExpression(e) => self.binary_expression_may_have_side_effects(e),
             Expression::ObjectExpression(object_expr) => object_expr
@@ -57,7 +57,7 @@ pub trait MayHaveSideEffects {
             operator != UnaryOperator::Delete
         }
         if is_simple_unary_operator(e.operator) {
-            return self.expression_may_have_side_efffects(&e.argument);
+            return self.expression_may_have_side_effects(&e.argument);
         }
         true
     }
@@ -67,8 +67,8 @@ pub trait MayHaveSideEffects {
         if matches!(e.operator, BinaryOperator::In | BinaryOperator::Instanceof) {
             return true;
         }
-        self.expression_may_have_side_efffects(&e.left)
-            || self.expression_may_have_side_efffects(&e.right)
+        self.expression_may_have_side_effects(&e.left)
+            || self.expression_may_have_side_effects(&e.right)
     }
 
     fn array_expression_element_may_have_side_effects(
@@ -77,10 +77,10 @@ pub trait MayHaveSideEffects {
     ) -> bool {
         match e {
             ArrayExpressionElement::SpreadElement(e) => {
-                self.expression_may_have_side_efffects(&e.argument)
+                self.expression_may_have_side_effects(&e.argument)
             }
             match_expression!(ArrayExpressionElement) => {
-                self.expression_may_have_side_efffects(e.to_expression())
+                self.expression_may_have_side_effects(e.to_expression())
             }
             ArrayExpressionElement::Elision(_) => false,
         }
@@ -90,21 +90,21 @@ pub trait MayHaveSideEffects {
         match e {
             ObjectPropertyKind::ObjectProperty(o) => self.object_property_may_have_side_effects(o),
             ObjectPropertyKind::SpreadProperty(e) => {
-                self.expression_may_have_side_efffects(&e.argument)
+                self.expression_may_have_side_effects(&e.argument)
             }
         }
     }
 
     fn object_property_may_have_side_effects(&self, e: &ObjectProperty<'_>) -> bool {
         self.property_key_may_have_side_effects(&e.key)
-            || self.expression_may_have_side_efffects(&e.value)
+            || self.expression_may_have_side_effects(&e.value)
     }
 
     fn property_key_may_have_side_effects(&self, key: &PropertyKey<'_>) -> bool {
         match key {
             PropertyKey::StaticIdentifier(_) | PropertyKey::PrivateIdentifier(_) => false,
             match_expression!(PropertyKey) => {
-                self.expression_may_have_side_efffects(key.to_expression())
+                self.expression_may_have_side_effects(key.to_expression())
             }
         }
     }
diff --git a/crates/oxc_minifier/src/peephole/fold_constants.rs b/crates/oxc_minifier/src/peephole/fold_constants.rs
index 8a0e2090a5f96..d1194987d0265 100644
--- a/crates/oxc_minifier/src/peephole/fold_constants.rs
+++ b/crates/oxc_minifier/src/peephole/fold_constants.rs
@@ -120,7 +120,7 @@ impl<'a, 'b> PeepholeOptimizations {
             // (FALSE && x) => FALSE
             if if lval { op == LogicalOperator::Or } else { op == LogicalOperator::And } {
                 return Some(ctx.ast.move_expression(&mut logical_expr.left));
-            } else if !ctx.expression_may_have_side_efffects(left) {
+            } else if !ctx.expression_may_have_side_effects(left) {
                 let parent = ctx.ancestry.parent();
                 // Bail `let o = { f() { assert.ok(this !== o); } }; (true && o.f)(); (true && o.f)``;`
                 if parent.is_tagged_template_expression()
@@ -145,7 +145,7 @@ impl<'a, 'b> PeepholeOptimizations {
                 let left_child_right_boolean = ctx.get_boolean_value(&left_child.right);
                 let left_child_op = left_child.operator;
                 if let Some(right_boolean) = left_child_right_boolean {
-                    if !ctx.expression_may_have_side_efffects(&left_child.right) {
+                    if !ctx.expression_may_have_side_effects(&left_child.right) {
                         // a || false || b => a || b
                         // a && true && b => a && b
                         if !right_boolean && left_child_op == LogicalOperator::Or
@@ -178,7 +178,7 @@ impl<'a, 'b> PeepholeOptimizations {
         let left_val = ValueType::from(left);
         match left_val {
             ValueType::Null | ValueType::Undefined => {
-                Some(if ctx.expression_may_have_side_efffects(left) {
+                Some(if ctx.expression_may_have_side_effects(left) {
                     // e.g. `(a(), null) ?? 1` => `(a(), null, 1)`
                     let expressions = ctx.ast.vec_from_array([
                         ctx.ast.move_expression(&mut logical_expr.left),
@@ -381,8 +381,7 @@ impl<'a, 'b> PeepholeOptimizations {
         let left = &e.left;
         let right = &e.right;
         let op = e.operator;
-        if ctx.expression_may_have_side_efffects(left)
-            || ctx.expression_may_have_side_efffects(right)
+        if ctx.expression_may_have_side_effects(left) || ctx.expression_may_have_side_effects(right)
         {
             return None;
         }
@@ -1828,6 +1827,11 @@ mod test {
         fold("typeof foo === 'number'", "typeof foo == 'number'");
     }
 
+    #[test]
+    fn test_issue_8782() {
+        fold("+(void unknown())", "+void unknown()");
+    }
+
     // TODO: All big ints are rare and difficult to handle.
     mod bigint {
         use super::{
diff --git a/crates/oxc_minifier/src/peephole/remove_dead_code.rs b/crates/oxc_minifier/src/peephole/remove_dead_code.rs
index 6d3fa63c37cf8..2ce741f70755a 100644
--- a/crates/oxc_minifier/src/peephole/remove_dead_code.rs
+++ b/crates/oxc_minifier/src/peephole/remove_dead_code.rs
@@ -389,7 +389,7 @@ impl<'a, 'b> PeepholeOptimizations {
                                     | ValueType::Boolean
                                     | ValueType::Number
                                     | ValueType::String
-                            ) && !ctx.expression_may_have_side_efffects(arg)
+                            ) && !ctx.expression_may_have_side_effects(arg)
                         }
                         _ => false,
                     },
@@ -526,7 +526,7 @@ impl<'a, 'b> PeepholeOptimizations {
 
         match ctx.get_boolean_value(&expr.test) {
             Some(v) => {
-                if ctx.expression_may_have_side_efffects(&expr.test) {
+                if ctx.expression_may_have_side_effects(&expr.test) {
                     let mut exprs = ctx.ast.vec_with_capacity(2);
                     exprs.push(ctx.ast.move_expression(&mut expr.test));
                     exprs.push(ctx.ast.move_expression(if v {
@@ -564,7 +564,7 @@ impl<'a, 'b> PeepholeOptimizations {
             (false, 0),
             |(mut should_fold, mut new_len), (i, expr)| {
                 if i == sequence_expr.expressions.len() - 1
-                    || ctx.expression_may_have_side_efffects(expr)
+                    || ctx.expression_may_have_side_effects(expr)
                 {
                     new_len += 1;
                 } else {
@@ -582,7 +582,7 @@ impl<'a, 'b> PeepholeOptimizations {
             let mut new_exprs = ctx.ast.vec_with_capacity(new_len);
             let len = sequence_expr.expressions.len();
             for (i, expr) in sequence_expr.expressions.iter_mut().enumerate() {
-                if i == len - 1 || ctx.expression_may_have_side_efffects(expr) {
+                if i == len - 1 || ctx.expression_may_have_side_effects(expr) {
                     new_exprs.push(ctx.ast.move_expression(expr));
                 }
             }
diff --git a/crates/oxc_minifier/src/peephole/substitute_alternate_syntax.rs b/crates/oxc_minifier/src/peephole/substitute_alternate_syntax.rs
index b9cbfae3555f1..e93af24b4b196 100644
--- a/crates/oxc_minifier/src/peephole/substitute_alternate_syntax.rs
+++ b/crates/oxc_minifier/src/peephole/substitute_alternate_syntax.rs
@@ -433,7 +433,7 @@ impl<'a> PeepholeOptimizations {
         if !match argument {
             Expression::Identifier(ident) => ctx.is_identifier_undefined(ident),
             Expression::UnaryExpression(e) => {
-                e.operator.is_void() && !ctx.expression_may_have_side_efffects(argument)
+                e.operator.is_void() && !ctx.expression_may_have_side_effects(argument)
             }
             _ => false,
         } {