Fix markdown issues (#208)

* Init fix/markdown

* Astro Markdown (#207)

* Add Astro Markdown to VSCode Extension

* Add Astro Markdown to Astro

* refactor: update astro-markdown example

* feat: remove embedded components from `.md` files

* fix: resolve `.md.astro` files at runtime

* chore: update markdown tests

* feat: add <Markdown> component

* chore: bump examples

* chore: update example

* fix: improve Markdown child handling

* feat: harden markdown support, add code fence support, add automatic dedenting

* chore: add weird markdown edge cases

* chore: update remote-markdown examples

* chore: add comment to Markdown.astro

* feat: improve markdown support (codefences, nested inside HTML)

* refactor: extract import specifier types to set

* refactor: conditionally import markdown renderer

* refactor: revert special-cased "astro/components"

* refactor: revert special-cased "astro/components"

* refactor: use astro/components/Markdown.astro

* refactor: remove `.md.astro` support in favor of Markdown component

* refactor: use regular .astro files

* refactor: remove unused code

* refactor: move Markdown inside Layout

* wip: markdown scoped styles

* feat: improve scoped styles in Markdown

* feat: micromark => remark ecosystem

* fix: markdown build

* fix: markdown build

* chore: add todo

* fix: collect headers text

* docs: add Markdown doc

* chore: add changeset

* docs: improve Markdown highlighting

* refactor: prefer Set

* refactor: exclude large unified deps

* docs: update markdown docs

Co-authored-by: Jonathan Neal <jonathantneal@hotmail.com>

* chore: remove extra markdown deps

* perf: optimize markdown

* fix: unified/rehype deps

* temp: fix markdown test

* test: add TODO comment

* fix: do not namespace frontmatter, just astro metadata

* test: fix astro-markdown test

* test: add realworld markdown example

* fix: prism language bug

* docs: update markdown docs

* chore: bump dependencies

* fix: escape codespan

* fix: unterminated string literal

* fix(vscode): inline dependencies

* fix(vscode): dependencies

* feat(vscode): embedded markdown

* feat: add Markdown syntax highlighting

* chore: improve markdown example

* fix: markdown example

* feat: highlighting improvements

* chore: add changeset

* fix: CodeBlock => CodeSpan

* chore: get astro-markdown example running

Co-authored-by: Jonathan Neal <jonathantneal@hotmail.com>

4 files changed, 88 insertions, 0 deletions

diff --git a/examples/astro-markdown/src/components/PreactCounter.tsx b/examples/astro-markdown/src/components/PreactCounter.tsx
new file mode 100644
index 000000000..e3761643f
--- /dev/null
+++ b/examples/astro-markdown/src/components/PreactCounter.tsx
@@ -0,0 +1,20 @@
+import { h, Fragment } from 'preact';
+import { useState } from 'preact/hooks';
+
+/** a counter written in Preact */
+export default function PreactCounter({ children }) {
+  const [count, setCount] = useState(0);
+  const add = () => setCount((i) => i + 1);
+  const subtract = () => setCount((i) => i - 1);
+
+  return (
+    <>
+      <div className="counter">
+        <button onClick={subtract}>-</button>
+        <pre>{count}</pre>
+        <button onClick={add}>+</button>
+      </div>
+      <div className="children">{children}</div>
+    </>
+  );
+}
diff --git a/examples/astro-markdown/src/components/ReactCounter.jsx b/examples/astro-markdown/src/components/ReactCounter.jsx
new file mode 100644
index 000000000..92871a8d8
--- /dev/null
+++ b/examples/astro-markdown/src/components/ReactCounter.jsx
@@ -0,0 +1,19 @@
+import React, { useState } from 'react';
+
+/** a counter written in React */
+export default function ReactCounter({ children }) {
+  const [count, setCount] = useState(0);
+  const add = () => setCount((i) => i + 1);
+  const subtract = () => setCount((i) => i - 1);
+
+  return (
+    <>
+      <div className="counter">
+        <button onClick={subtract}>-</button>
+        <pre>{count}</pre>
+        <button onClick={add}>+</button>
+      </div>
+      <div className="children">{children}</div>
+    </>
+  );
+}
diff --git a/examples/astro-markdown/src/components/SvelteCounter.svelte b/examples/astro-markdown/src/components/SvelteCounter.svelte
new file mode 100644
index 000000000..8d6b3f5e1
--- /dev/null
+++ b/examples/astro-markdown/src/components/SvelteCounter.svelte
@@ -0,0 +1,22 @@
+
+<script>
+  let children;
+  let count = 0;
+
+  function add() {
+		count += 1;
+	}
+
+  function subtract() {
+		count -= 1;
+	}
+</script>
+
+<div class="counter">
+    <button on:click={subtract}>-</button>
+    <pre>{ count }</pre>
+    <button on:click={add}>+</button>
+</div>
+<div class="children">
+    <slot />
+</div>
diff --git a/examples/astro-markdown/src/components/VueCounter.vue b/examples/astro-markdown/src/components/VueCounter.vue
new file mode 100644
index 000000000..8179fb1d9
--- /dev/null
+++ b/examples/astro-markdown/src/components/VueCounter.vue
@@ -0,0 +1,27 @@
+<template>
+  <div class="counter">
+      <button @click="subtract()">-</button>
+      <pre>{{ count }}</pre>
+      <button @click="add()">+</button>
+  </div>
+  <div class="children">
+      <slot />
+  </div>
+</template>
+
+<script>
+import { ref } from 'vue';
+export default {
+  setup() {
+    const count = ref(0)
+    const add = () => count.value = count.value + 1;
+    const subtract = () => count.value = count.value - 1;
+
+    return {
+      count,
+      add,
+      subtract
+    }
+  }
+}
+</script>