Support for custom elements (#45)

* Support for custom elements

Now you can use custom elements like so in Astro components:

```html
<script type="module" src="./datepicker.js">
<date-picker></date-picker>
```

These will be resolve relative to the current astro component. In the build these modules are run through the same bundle/minify process as components.

* Remove component from public

* Formatting

* Disable empty fn rule

1 files changed, 23 insertions, 0 deletions

diff --git a/src/ast.ts b/src/ast.ts
new file mode 100644
index 000000000..6c0bd7bd2
--- /dev/null
+++ b/src/ast.ts
@@ -0,0 +1,23 @@
+import type { Attribute } from './parser/interfaces';
+
+// AST utility functions
+
+export function getAttr(attributes: Attribute[], name: string): Attribute | undefined {
+  const attr = attributes.find((a) => a.name === name);
+  return attr;
+}
+
+export function getAttrValue(attributes: Attribute[], name: string): string | undefined {
+  const attr = getAttr(attributes, name);
+  if (attr) {
+    return attr.value[0]?.data;
+  }
+}
+
+export function setAttrValue(attributes: Attribute[], name: string, value: string): void {
+  const attr = attributes.find((a) => a.name === name);
+  if (attr) {
+    attr.value[0]!.data = value;
+    attr.value[0]!.raw = value;
+  }
+}