fix: remove scaped char \ from attributes value

src/from-markdown.ts

@@ -224,7 +224,9 @@ export default (opts: RemarkMDCOptions = {}) => {
 
   function exitAttributeValue (this: CompileContext, token: Token) {
     const attributes = (this.data as any).componentAttributes
-    attributes[attributes.length - 1][1] = parseEntities(this.sliceSerialize(token))
+    const lastAttribute = attributes[attributes.length - 1]
+
+    lastAttribute[1] = (typeof lastAttribute[1] === 'string' ? lastAttribute[1] : '') + parseEntities(this.sliceSerialize(token))
   }
 
   function exitAttributeName (this: CompileContext, token: Token) {

src/micromark-extension/factory-attributes.ts

@@ -296,6 +296,17 @@ export default function createAttributes (
   }
 
   function valueQuoted (code: number) {
+    if (code === Codes.backSlash) {
+      effects.exit(attributeValueData)
+      effects.exit(attributeValueType)
+      effects.enter('escapeCharacter')
+      effects.consume(code)
+      effects.exit('escapeCharacter')
+      effects.enter(attributeValueType)
+      effects.enter(attributeValueData)
+      return valueQuotedEscape
+    }
+
     if (code === marker || code === Codes.EOF || markdownLineEnding(code)) {
       effects.exit(attributeValueData)
       return valueQuotedBetween(code)
@@ -305,6 +316,12 @@ export default function createAttributes (
     return valueQuoted
   }
 
+  function valueQuotedEscape (code: number) {
+    effects.consume(code)
+
+    return valueQuoted
+  }
+
   function valueQuotedAfter (code: number) {
     return code === Codes.closingCurlyBracket || markdownLineEndingOrSpace(code) ? between(code) : end(code)
   }

src/micromark-extension/types.ts

@@ -72,6 +72,8 @@ declare module 'micromark-util-types' {
     bindingContent: 'bindingContent',
     bindingFence: 'bindingFence',
 
+    escapeCharacter: 'escapeCharacter',
+
     // Component Text
     componentText: 'componentText',
     componentTextMarker: 'componentTextMarker',

src/to-markdown.ts

@@ -219,7 +219,7 @@ export default (opts: RemarkMDCOptions = {}) => {
         } else if (key.startsWith(':') && value === 'true') {
           values.push(key.slice(1))
         } else if (key.startsWith(':') && isValidJSON(value)) {
-          values.push(`${key}='${value}'`)
+          values.push(`${key}='${value.replace(/([^/])'/g, '$1\\\'')}'`)
         } else {
           values.push(quoted(key, value))
         }

test/__snapshots__/block-component.test.ts.snap

@@ -1057,6 +1057,53 @@ exports[`block-component > ignore-code-fence 1`] = `
 }
 `;
 
+exports[`block-component > jsonScapeAttr 1`] = `
+{
+  "children": [
+    {
+      "attributes": {
+        ":test": "{"foo":"I'd love to"}",
+      },
+      "children": [],
+      "data": {
+        "hName": "foo",
+        "hProperties": {
+          ":test": "{"foo":"I'd love to"}",
+        },
+      },
+      "fmAttributes": {},
+      "name": "foo",
+      "position": {
+        "end": {
+          "column": 3,
+          "line": 2,
+          "offset": 40,
+        },
+        "start": {
+          "column": 1,
+          "line": 1,
+          "offset": 0,
+        },
+      },
+      "type": "containerComponent",
+    },
+  ],
+  "position": {
+    "end": {
+      "column": 3,
+      "line": 2,
+      "offset": 40,
+    },
+    "start": {
+      "column": 1,
+      "line": 1,
+      "offset": 0,
+    },
+  },
+  "type": "root",
+}
+`;
+
 exports[`block-component > nested-component 1`] = `
 {
   "children": [

test/block-component.test.ts

@@ -29,6 +29,12 @@ describe('block-component', () => {
       markdown: '::with-frontmatter\n---\nkey: value\narray:\n  - item\n  - itemKey: value\n---\n::',
       expected: '::with-frontmatter\n---\narray:\n  - item\n  - itemKey: value\nkey: value\n---\n::'
     },
+    jsonScapeAttr: {
+      markdown: '::foo{:test=\'{"foo":"I\\\'d love to"}\'}\n::',
+      extra: (_md, ast) => {
+        expect(ast.children[0].type).toBe('containerComponent')
+      }
+    },
     frontmatter1: {
       markdown: [
         '::with-frontmatter',