feat(minifier): imprve more conditional expr minification with boolea…

…n lit (#8208)
oxc-project · Jan 1, 2025 · 4ae15df · 4ae15df
1 parent 3202b4f
commit 4ae15df
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Showing 2 changed files with 27 additions and 4 deletions.
diff --git a/crates/oxc_minifier/src/ast_passes/peephole_minimize_conditions.rs b/crates/oxc_minifier/src/ast_passes/peephole_minimize_conditions.rs
@@ -341,6 +341,29 @@ impl<'a> PeepholeMinimizeConditions {
             ));
         }
 
+        // `x ? y : true` -> `!x || y`
+        // `x ? y : false` -> `x && y`
+        if let (Expression::Identifier(_), _, Expression::BooleanLiteral(alternate_lit)) =
+            (&expr.test, &expr.consequent, &expr.alternate)
+        {
+            if alternate_lit.value {
+                let ident = ctx.ast.move_expression(&mut expr.test);
+                return Some(ctx.ast.expression_logical(
+                    expr.span,
+                    ctx.ast.expression_unary(expr.span, UnaryOperator::LogicalNot, ident),
+                    LogicalOperator::Or,
+                    ctx.ast.move_expression(&mut expr.consequent),
+                ));
+            }
+            let ident = ctx.ast.move_expression(&mut expr.test);
+            return Some(ctx.ast.expression_logical(
+                expr.span,
+                ident,
+                LogicalOperator::And,
+                ctx.ast.move_expression(&mut expr.consequent),
+            ));
+        }
+
         None
     }
 }
@@ -645,7 +668,7 @@ mod test {
         fold("(x ? true : false) && y()", "!!x && y()");
         fold("(x ? false : true) && y()", "!x && y()");
         fold("(x ? true : y) && y()", "(x || y) && y()");
-        // fold("(x ? y : false) && y()", "(x && y) && y()");
+        fold("(x ? y : false) && y()", "(x && y) && y()");
         // fold("(x && true) && y()", "x && y()");
         // fold("(x && false) && y()", "0&&y()");
         // fold("(x || true) && y()", "1&&y()");

diff --git a/tasks/minsize/minsize.snap b/tasks/minsize/minsize.snap
@@ -13,15 +13,15 @@ Original   | minified   | minified   | gzip       | gzip       | Fixture
 
 555.77 kB  | 273.48 kB  | 270.13 kB  | 90.94 kB   | 90.80 kB   | d3.js     
 
-1.01 MB    | 460.75 kB  | 458.89 kB  | 126.87 kB  | 126.71 kB  | bundle.min.js
+1.01 MB    | 460.75 kB  | 458.89 kB  | 126.88 kB  | 126.71 kB  | bundle.min.js
 
 1.25 MB    | 653.17 kB  | 646.76 kB  | 163.58 kB  | 163.73 kB  | three.js  
 
 2.14 MB    | 726.71 kB  | 724.14 kB  | 180.25 kB  | 181.07 kB  | victory.js
 
 3.20 MB    | 1.01 MB    | 1.01 MB    | 332.13 kB  | 331.56 kB  | echarts.js
 
-6.69 MB    | 2.32 MB    | 2.31 MB    | 493.01 kB  | 488.28 kB  | antd.js   
+6.69 MB    | 2.32 MB    | 2.31 MB    | 493.00 kB  | 488.28 kB  | antd.js   
 
-10.95 MB   | 3.51 MB    | 3.49 MB    | 910.12 kB  | 915.50 kB  | typescript.js
+10.95 MB   | 3.51 MB    | 3.49 MB    | 910.09 kB  | 915.50 kB  | typescript.js