feat: find whitespace from operator position to start

src/ast/nodes/LogicalExpression.ts

@@ -2,6 +2,7 @@ import type MagicString from 'magic-string';
 import { BLANK, EMPTY_ARRAY } from '../../utils/blank';
 import {
 	findFirstOccurrenceOutsideComment,
+	findLastWhiteSpaceReverse,
 	findNonWhiteSpace,
 	type NodeRenderOptions,
 	removeLineBreaks,
@@ -185,20 +186,20 @@ export default class LogicalExpression extends NodeBase implements Deoptimizable
 		}: NodeRenderOptions = BLANK
 	): void {
 		if (!this.left.included || !this.right.included) {
+			const operatorPos = findFirstOccurrenceOutsideComment(
+				code.original,
+				this.operator,
+				this.left.end
+			);
 			if (this.right.included) {
-				const operatorPos = findFirstOccurrenceOutsideComment(
-					code.original,
-					this.operator,
-					this.left.end
-				);
 				const removePos = findNonWhiteSpace(code.original, operatorPos + 2);
 				code.remove(this.start, removePos);
 				if (preventASI) {
 					removeLineBreaks(code, removePos, this.right.start);
 				}
 				this.left.removeAnnotations(code);
 			} else {
-				code.remove(this.left.end, this.end);
+				code.remove(findLastWhiteSpaceReverse(code.original, this.left.end, operatorPos), this.end);
 			}
 			this.getUsedBranch()!.render(code, options, {
 				isCalleeOfRenderedParent,

src/utils/renderHelpers.ts

@@ -68,6 +68,22 @@ export function findNonWhiteSpace(code: string, index: number): number {
 	return result.index;
 }
 
+const WHITESPACE = /\s/;
+
+export function findLastWhiteSpaceReverse(code: string, start: number, end: number): number {
+	end--;
+	while (true) {
+		if (start + 1 >= end) {
+			return end;
+		}
+		if (WHITESPACE.test(code[end])) {
+			end--;
+		} else {
+			return end;
+		}
+	}
+}
+
 // This assumes "code" only contains white-space and comments
 // Returns position of line-comment if applicable
 export function findFirstLineBreakOutsideComment(code: string): [number, number] {

test/form/samples/remove-whitespace-of-logical-expression/_config.js

@@ -0,0 +1,4 @@
+module.exports = defineTest({
+	description: 'remove the white space of the removed part of LogicalExpression',
+	solo: true
+});

test/form/samples/remove-whitespace-of-logical-expression/_expected.js

@@ -0,0 +1,5 @@
+function App() {
+	set_class(`abc ${'red'}`);
+}
+
+export { App as default };

test/form/samples/remove-whitespace-of-logical-expression/main.js

@@ -0,0 +1,4 @@
+export default function App() {
+	let color;
+	set_class(`abc ${(color || 'red') ?? ''}`);
+}