Astro Image Optimization: Challenges and Solutions

Astro Image Optimization: Challenges and Solutions

Challenge 1: MDX Parsing Error with getImage() and Top-Level await

Problem

Initial attempt to use getImage() with top-level await in the MDX file failed with a parsing error: “Expected } but found :” or “Could not parse expression with oxc”.

Root Cause

MDX files don’t support top-level await expressions. The getImage() function is async and cannot be used at the top level of MDX files.

Solution

Use the <Image src={imageImport} /> component syntax directly with image imports instead of getImage():

---
import { Image } from 'astro:assets';
import natureImage from '../../../assets/images/image-generation/1-nature-landscape.png';
---

<Image src={natureImage} alt="Nature Landscape" loading="lazy" />

Challenge 2: MDX Comment Syntax Error

Problem

The <!-- excerpt --> HTML comment in the MDX file caused a parsing error: “Unexpected character ! (U+0021) before name, expected a character that can start a name, such as a letter, $, or _ (note: to create a comment in MDX, use {/* text */})”.

Root Cause

MDX files use JSX-style comments, not HTML comments. The <!-- comment --> syntax is not valid in MDX.

Solution

Change HTML comments to MDX/JSX-style comments: {/* excerpt */}.

Challenge 3: Image Import Path and Location Issues

Problem

Images were initially in site/public/assets/images/image-generation/, but Astro’s image optimization pipeline requires images to be in the src/ directory. Import paths were also incorrect.

Root Cause

Images in the public/ directory are served as-is and are not optimized by Astro’s image pipeline. Only images in the src/ directory are processed and optimized.

Solution

1. Move images to site/src/assets/images/image-generation/
2. Fix import paths to correctly reference ../../../assets/images/image-generation/... from the blog directory

site/src/assets/images/image-generation/
├── 1-nature-landscape.png
├── 2-scifi-cyberpunk.png
├── 3-portrait-realistic.png
├── 4-abstract-artistic.png
└── 5-food-culinary.png

Challenge 4: Missing sharp Package

Problem

Build failed with “MissingSharp: Could not find Sharp. Please install Sharp (sharp) manually into your project or migrate to another image service.”

Root Cause

Astro 7.x uses sharp for image optimization. The sharp package must be installed as a dev dependency.

Solution

Install sharp as a dev dependency:

pnpm add -D sharp

Key Takeaways

1. MDX files support <Image /> component: Use .mdx files (not .md) for JSX components like <Image /> from astro:assets.
2. Images must be in src/ directory: Astro’s image optimization pipeline requires images in src/assets/..., not public/assets/....
3. sharp package is required: Must be installed as a dev dependency for image optimization in Astro 7.x.
4. MDX comment syntax: Use {/* comment */} instead of <!-- comment --> in MDX files.