fix: parse error on void boolean attributes (#431)

close #429

Author: JounQin

.changeset/khaki-squids-leave.md

@@ -0,0 +1,5 @@
+---
+"eslint-mdx": patch
+---
+
+fix: parse error on void boolean attributes

packages/eslint-mdx/src/tokens.ts

@@ -57,6 +57,8 @@ export const restoreTokens = (
     const nodeStart = nodePos.start.offset
     const nodeEnd = nodePos.end.offset
 
+    const lastCharOffset = prevCharOffset(nodeEnd - 2)
+
     assert(nodeStart != null)
     assert(nodeEnd != null)
 
@@ -79,6 +81,8 @@ export const restoreTokens = (
     const nodeName = node.name
     const nodeNameLength = nodeName?.length ?? 0
 
+    const selfClosing = text[lastCharOffset] === '/'
+
     let nodeNameStart = nodeStart + 1
 
     if (nodeName) {
@@ -200,15 +204,23 @@ export const restoreTokens = (
       assert(text[lastAttrOffset] === attrQuote)
     }
 
-    const nextOffset = nextCharOffset(lastAttrOffset + 1)
+    let nextOffset = nextCharOffset(lastAttrOffset + 1)
+    let nextChar = text[nextOffset]
 
-    const nextChar = text[nextOffset]
+    const expectedNextChar = selfClosing ? '/' : '>'
 
-    // self closing tag
-    if (nextChar === '/') {
+    if (nextChar !== expectedNextChar) {
+      nextOffset = /** @type {number} */ nextCharOffset(lastAttrOffset)
+      nextChar = text[nextOffset]
+    }
+
+    if (selfClosing) {
       tokens.push(newToken(tt.slash, nextOffset, nextOffset + 1, '/'))
     } else {
-      assert(nextChar === '>')
+      assert(
+        nextChar === '>',
+        `\`nextChar\` must be '>' but actually is '${nextChar}'`,
+      )
 
       const prevOffset = prevCharOffset(nodeEnd - 2)
 

packages/eslint-mdx/src/worker.ts

@@ -526,11 +526,20 @@ runAsWorker(
               children,
             }
 
-            const nextOffset = nextCharOffset(lastAttrOffset + 1)
+            let nextOffset = nextCharOffset(lastAttrOffset + 1)
+            let nextChar = text[nextOffset]
 
-            const nextChar = text[nextOffset]
+            const expectedNextChar = selfClosing ? '/' : '>'
 
-            assert(nextChar === (selfClosing ? '/' : '>'))
+            if (nextChar !== expectedNextChar) {
+              nextOffset = /** @type {number} */ nextCharOffset(lastAttrOffset)
+              nextChar = text[nextOffset]
+            }
+
+            assert(
+              nextChar === expectedNextChar,
+              `\`nextChar\` must be '${expectedNextChar}' but actually is '${nextChar}'`,
+            )
 
             Object.assign(
               jsxEl.openingElement,

test/__snapshots__/fixtures.test.ts.snap

@@ -394,6 +394,29 @@ exports[`fixtures should match all snapshots: 391.mdx 1`] = `
 ]
 `;
 
+exports[`fixtures should match all snapshots: 429.mdx 1`] = `
+[
+  {
+    "column": 17,
+    "endColumn": 17,
+    "endLine": 3,
+    "fix": {
+      "range": [
+        49,
+        49,
+      ],
+      "text": " ",
+    },
+    "line": 3,
+    "message": "Insert \`·\`",
+    "messageId": "insert",
+    "nodeType": null,
+    "ruleId": "prettier/prettier",
+    "severity": 2,
+  },
+]
+`;
+
 exports[`fixtures should match all snapshots: acorn.mdx 1`] = `
 [
   {