diff --git a/packages/language-core/lib/codegen/template/elementProps.ts b/packages/language-core/lib/codegen/template/elementProps.ts
index bc89699972..4901430045 100644
--- a/packages/language-core/lib/codegen/template/elementProps.ts
+++ b/packages/language-core/lib/codegen/template/elementProps.ts
@@ -68,7 +68,7 @@ export function* generateElementProps(
 
 			if (
 				propName === undefined
-				|| options.vueCompilerOptions.dataAttributes.some(pattern => minimatch(propName!, pattern))
+				|| options.vueCompilerOptions.dataAttributes.some(pattern => minimatch(propName, pattern))
 				|| (propName === 'style' && ++styleAttrNum >= 2)
 				|| (propName === 'class' && ++classAttrNum >= 2)
 				|| (propName === 'name' && node.tagType === CompilerDOM.ElementTypes.SLOT) // #2308
@@ -82,7 +82,7 @@ export function* generateElementProps(
 			const shouldCamelize = canCamelize
 				&& (!prop.arg || (prop.arg.type === CompilerDOM.NodeTypes.SIMPLE_EXPRESSION && prop.arg.isStatic)) // isStatic
 				&& hyphenateAttr(propName) === propName
-				&& !options.vueCompilerOptions.htmlAttributes.some(pattern => minimatch(propName!, pattern));
+				&& !options.vueCompilerOptions.htmlAttributes.some(pattern => minimatch(propName, pattern));
 
 			const codes = wrapWith(
 				prop.loc.start.offset,
diff --git a/packages/language-core/lib/plugins/file-html.ts b/packages/language-core/lib/plugins/file-html.ts
index afd3c28e1f..72440aebc7 100644
--- a/packages/language-core/lib/plugins/file-html.ts
+++ b/packages/language-core/lib/plugins/file-html.ts
@@ -39,7 +39,7 @@ const plugin: VueLanguagePlugin = () => {
 					const attrs = match[2];
 					const lang = attrs.match(langReg)?.[2];
 					const content = match[3];
-					const contentStart = match.index! + matchText.indexOf(content);
+					const contentStart = match.index + matchText.indexOf(content);
 
 					if (tag === 'style') {
 						sfc.descriptor.styles.push({
@@ -70,7 +70,7 @@ const plugin: VueLanguagePlugin = () => {
 						};
 					}
 
-					templateContent = templateContent.substring(0, match.index) + ' '.repeat(matchText.length) + templateContent.substring(match.index! + matchText.length);
+					templateContent = templateContent.substring(0, match.index) + ' '.repeat(matchText.length) + templateContent.substring(match.index + matchText.length);
 				}
 
 				sfc.descriptor.template = {
diff --git a/packages/language-service/lib/plugins/vue-twoslash-queries.ts b/packages/language-service/lib/plugins/vue-twoslash-queries.ts
index 093943a392..86987bdaab 100644
--- a/packages/language-service/lib/plugins/vue-twoslash-queries.ts
+++ b/packages/language-service/lib/plugins/vue-twoslash-queries.ts
@@ -26,7 +26,7 @@ export function create(
 					const inlayHints: vscode.InlayHint[] = [];
 
 					for (const pointer of document.getText(range).matchAll(twoslashReg)) {
-						const offset = pointer.index! + pointer[0].indexOf('^?') + document.offsetAt(range.start);
+						const offset = pointer.index + pointer[0].indexOf('^?') + document.offsetAt(range.start);
 						const position = document.positionAt(offset);
 						hoverOffsets.push([position, document.offsetAt({
 							line: position.line - 1,