release notes and an additional fix for #2270

Author: evanw

CHANGELOG.md

@@ -1,5 +1,13 @@
 # Changelog
 
+## Unreleased
+
+* Fix a minification regression in 0.14.40 ([#2270](https://github.com/evanw/esbuild/issues/2270), [#2271](https://github.com/evanw/esbuild/issues/2271), [#2273](https://github.com/evanw/esbuild/pull/2273))
+
+    Version 0.14.40 substituted string property keys with numeric property keys if the number has the same string representation as the original string. This was done in three places: computed member expressions, object literal properties, and class fields. However, negative numbers are only valid in computed member expressions while esbuild incorrectly applied this substitution for negative numbers in all places. This release fixes the regression by only doing this substitution for negative numbers in computed member expressions.
+
+    This fix was contributed by [@susiwen8](https://github.com/susiwen8).
+
 ## 0.14.40
 
 * Correct esbuild's implementation of `"preserveValueImports": true` ([#2268](https://github.com/evanw/esbuild/issues/2268))

internal/js_parser/js_parser.go

@@ -10382,7 +10382,7 @@ func (p *parser) visitClass(nameScopeLoc logger.Loc, class *js_ast.Class, defaul
 
 			if p.options.minifySyntax {
 				if str, ok := key.Data.(*js_ast.EString); ok {
-					if numberValue, ok := stringToEquivalentNumberValue(str.Value); ok {
+					if numberValue, ok := stringToEquivalentNumberValue(str.Value); ok && numberValue >= 0 {
 						// "class { '123' }" => "class { 123 }"
 						property.Key.Data = &js_ast.ENumber{Value: numberValue}
 						property.Flags &= ^js_ast.PropertyIsComputed
@@ -13183,7 +13183,7 @@ func (p *parser) visitExprInOut(expr js_ast.Expr, in exprIn) (js_ast.Expr, exprO
 			// "{ '123': 4 }" => "{ 123: 4 }" (this is done late to allow "'123'" to be mangled)
 			if p.options.minifySyntax {
 				if str, ok := property.Key.Data.(*js_ast.EString); ok {
-					if numberValue, ok := stringToEquivalentNumberValue(str.Value); numberValue >= 0 && ok {
+					if numberValue, ok := stringToEquivalentNumberValue(str.Value); ok && numberValue >= 0 {
 						property.Key.Data = &js_ast.ENumber{Value: numberValue}
 					}
 				}

internal/js_parser/js_parser_test.go

@@ -1578,15 +1578,15 @@ func TestClass(t *testing.T) {
 	// Check the string-to-int optimization
 	expectPrintedMangle(t, "class x { '0' = y }", "class x {\n  0 = y;\n}\n")
 	expectPrintedMangle(t, "class x { '123' = y }", "class x {\n  123 = y;\n}\n")
-	expectPrintedMangle(t, "class x { ['-123'] = y }", "class x {\n  -123 = y;\n}\n")
+	expectPrintedMangle(t, "class x { ['-123'] = y }", "class x {\n  \"-123\" = y;\n}\n")
 	expectPrintedMangle(t, "class x { '-0' = y }", "class x {\n  \"-0\" = y;\n}\n")
 	expectPrintedMangle(t, "class x { '01' = y }", "class x {\n  \"01\" = y;\n}\n")
 	expectPrintedMangle(t, "class x { '-01' = y }", "class x {\n  \"-01\" = y;\n}\n")
 	expectPrintedMangle(t, "class x { '0x1' = y }", "class x {\n  \"0x1\" = y;\n}\n")
 	expectPrintedMangle(t, "class x { '-0x1' = y }", "class x {\n  \"-0x1\" = y;\n}\n")
 	expectPrintedMangle(t, "class x { '2147483647' = y }", "class x {\n  2147483647 = y;\n}\n")
 	expectPrintedMangle(t, "class x { '2147483648' = y }", "class x {\n  \"2147483648\" = y;\n}\n")
-	expectPrintedMangle(t, "class x { ['-2147483648'] = y }", "class x {\n  -2147483648 = y;\n}\n")
+	expectPrintedMangle(t, "class x { ['-2147483648'] = y }", "class x {\n  \"-2147483648\" = y;\n}\n")
 	expectPrintedMangle(t, "class x { ['-2147483649'] = y }", "class x {\n  \"-2147483649\" = y;\n}\n")
 }