chore: add changeset and update metrics baseline

Add changeset for context providers and memoization feature. Update metrics baseline to reflect current performance after optimizations.

Author: quantizor

.changeset/context-providers-and-memoization.md

@@ -0,0 +1,54 @@
+---
+'markdown-to-jsx': minor
+---
+
+Add context providers and memoization to React, React Native, and Vue
+
+Added context providers and memoization to all major renderers for better developer experience and performance.
+
+**React:**
+- `MarkdownContext` - React context for default options
+- `MarkdownProvider` - Provider component to avoid prop-drilling
+- `useMemo` - 3-stage memoization (options, content, JSX)
+
+**React Native:**
+- `MarkdownContext` - React context for default options
+- `MarkdownProvider` - Provider component to avoid prop-drilling
+- `useMemo` - 3-stage memoization (options, content, JSX)
+
+**Vue:**
+- `MarkdownOptionsKey` - InjectionKey for provide/inject pattern
+- `MarkdownProvider` - Provider component using Vue's provide
+- `computed` - Reactive memoization for options, content, and JSX
+
+**Benefits:**
+
+1. **Avoid prop-drilling** - Set options once at the top level:
+```tsx
+<MarkdownProvider options={commonOptions}>
+  <App>
+    <Markdown>...</Markdown>
+    <Markdown>...</Markdown>
+  </App>
+</MarkdownProvider>
+```
+
+2. **Performance optimization** - Content is only parsed when it actually changes, not on every render
+
+3. **Fully backwards compatible** - Existing usage works unchanged, providers are optional
+
+**Example:**
+```tsx
+import { MarkdownProvider } from 'markdown-to-jsx/react'
+
+function App() {
+  return (
+    <MarkdownProvider options={{ wrapper: 'article', tagfilter: true }}>
+      <Markdown># Page 1</Markdown>
+      <Markdown># Page 2</Markdown>
+      {/* Both inherit options from provider */}
+    </MarkdownProvider>
+  )
+}
+```
+

scripts/metrics.baseline.json

@@ -254,10 +254,10 @@
     }
   },
   "parser": {
-    "timestamp": "2025-12-16T04:04:54.770Z",
+    "timestamp": "2025-12-16T05:00:42.963Z",
     "target": "parser",
     "inputSize": 173,
-    "parseTime": 6.65,
+    "parseTime": 6.89,
     "blockParsers": {
       "blockQuote": {
         "attempts": 70,
@@ -381,10 +381,10 @@
     }
   },
   "react": {
-    "timestamp": "2025-11-30T05:32:38.442Z",
+    "timestamp": "2025-12-16T05:04:20.136Z",
     "target": "react",
     "inputSize": 173,
-    "parseTime": 7.86,
+    "parseTime": 10.02,
     "blockParsers": {
       "blockQuote": {
         "attempts": 70,
@@ -633,5 +633,132 @@
       "blockParseIterations": 919,
       "inlineParseIterations": 1283
     }
+  },
+  "react-native": {
+    "timestamp": "2025-12-16T04:57:28.130Z",
+    "target": "react-native",
+    "inputSize": 173,
+    "parseTime": 8.98,
+    "blockParsers": {
+      "blockQuote": {
+        "attempts": 70,
+        "hits": 60
+      },
+      "breakThematic": {
+        "attempts": 573,
+        "hits": 55
+      },
+      "codeBlock": {
+        "attempts": 30,
+        "hits": 20
+      },
+      "codeFenced": {
+        "attempts": 184,
+        "hits": 21
+      },
+      "footnote": {
+        "attempts": 15,
+        "hits": 0
+      },
+      "frontmatter": {
+        "attempts": 1,
+        "hits": 1
+      },
+      "heading": {
+        "attempts": 794,
+        "hits": 787
+      },
+      "headingSetext": {
+        "attempts": 1144,
+        "hits": 11
+      },
+      "htmlBlock": {
+        "attempts": 88,
+        "hits": 25
+      },
+      "htmlComment": {
+        "attempts": 6,
+        "hits": 3
+      },
+      "listGfmTask": {
+        "attempts": 20,
+        "hits": 20
+      },
+      "list": {
+        "attempts": 261,
+        "hits": 151
+      },
+      "paragraph": {
+        "attempts": 872,
+        "hits": 311
+      },
+      "table": {
+        "attempts": 40,
+        "hits": 40
+      }
+    },
+    "inlineParsers": {
+      "breakLine": {
+        "attempts": 5,
+        "hits": 5
+      },
+      "codeInline": {
+        "attempts": 51,
+        "hits": 51
+      },
+      "escaped": {
+        "attempts": 5,
+        "hits": 5
+      },
+      "formatting": {
+        "attempts": 392,
+        "hits": 392
+      },
+      "footnoteRef": {
+        "attempts": 15,
+        "hits": 15
+      },
+      "htmlComment": {
+        "attempts": 20,
+        "hits": 10
+      },
+      "htmlElement": {
+        "attempts": 66,
+        "hits": 66
+      },
+      "image": {
+        "attempts": 25,
+        "hits": 25
+      },
+      "link": {
+        "attempts": 51,
+        "hits": 42
+      },
+      "linkAngleBrace": {
+        "attempts": 76,
+        "hits": 10
+      },
+      "linkBareUrl": {
+        "attempts": 25,
+        "hits": 25
+      },
+      "linkEmail": {
+        "attempts": 5,
+        "hits": 5
+      },
+      "linkRef": {
+        "attempts": 44,
+        "hits": 20
+      },
+      "refImage": {
+        "attempts": 0,
+        "hits": 0
+      }
+    },
+    "operationCounts": {
+      "totalOperations": 3348,
+      "blockParseIterations": 919,
+      "inlineParseIterations": 1283
+    }
   }
-}
+}