Add default asset loaders to esbuild config

Common image and font file types now have default loaders (dataurl for
images, file for fonts) so bundled client scripts can import assets
without requiring a custom esbuild.settings.js.

Closes #230

Author: bcomnes

lib/build-esbuild/index.js

@@ -204,7 +204,22 @@ async function assembleBuildOpts (src, dest, siteData, opts, modeOpts = {}) {
     entryNames: watch ? '[dir]/[name]' : '[dir]/[name]-[hash]',
     chunkNames: 'chunks/[ext]/[name]-[hash]',
     jsx: 'automatic',
-    jsxImportSource: 'preact'
+    jsxImportSource: 'preact',
+    loader: {
+      '.png': 'dataurl',
+      '.jpg': 'dataurl',
+      '.jpeg': 'dataurl',
+      '.gif': 'dataurl',
+      '.svg': 'dataurl',
+      '.webp': 'dataurl',
+      '.avif': 'dataurl',
+      '.ico': 'file',
+      '.woff': 'file',
+      '.woff2': 'file',
+      '.ttf': 'file',
+      '.eot': 'file',
+      '.otf': 'file',
+    }
   }
 
   const esbuildSettingsExtends = siteData.esbuildSettings