54 lines
1.7 KiB
TypeScript
54 lines
1.7 KiB
TypeScript
import type { Literal, Node, Parent } from 'unist';
|
|
import { visit } from 'unist-util-visit';
|
|
import { imageMetadata } from '../src/helpers/images';
|
|
|
|
export type ImageNode = Parent & {
|
|
url: string;
|
|
alt: string;
|
|
name: string;
|
|
width?: number;
|
|
height?: number;
|
|
attributes: (Literal & { name: string })[];
|
|
};
|
|
|
|
export const astroImage = () => {
|
|
return async (tree: Node) => {
|
|
const images: ImageNode[] = [];
|
|
|
|
// Find all the local image node.
|
|
visit(tree, 'image', (node: Node, _, __: Parent) => {
|
|
const imageNode = node as ImageNode;
|
|
// Skip remote images.
|
|
if (imageNode.url.startsWith('http')) {
|
|
return;
|
|
}
|
|
|
|
images.push(imageNode);
|
|
});
|
|
|
|
// Process images.
|
|
await Promise.all(images.map(transformAstroImage));
|
|
return tree;
|
|
};
|
|
};
|
|
|
|
const transformAstroImage = async (imageNode: ImageNode) => {
|
|
const metadata = await imageMetadata(imageNode.url);
|
|
if (metadata == null) {
|
|
throw new Error(`Failed to get image metadata: ${imageNode.url}`);
|
|
}
|
|
|
|
// Convert original node to next/image
|
|
imageNode.type = 'mdxJsxFlowElement';
|
|
imageNode.name = 'Image';
|
|
imageNode.attributes = [
|
|
{ type: 'mdxJsxAttribute', name: 'alt', value: imageNode.alt },
|
|
{ type: 'mdxJsxAttribute', name: 'src', value: imageNode.url },
|
|
{ type: 'mdxJsxAttribute', name: 'width', value: imageNode.width ?? metadata.width },
|
|
{ type: 'mdxJsxAttribute', name: 'height', value: imageNode.height ?? metadata.height },
|
|
{ type: 'mdxJsxAttribute', name: 'blurDataURL', value: metadata.blurDataURL },
|
|
{ type: 'mdxJsxAttribute', name: 'blurWidth', value: metadata.blurWidth },
|
|
{ type: 'mdxJsxAttribute', name: 'blurHeight', value: metadata.blurHeight },
|
|
];
|
|
};
|