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import type { Data, VFile } from 'vfile';
import type { MarkdownAstroData } from './types.js';
function isValidAstroData(obj: unknown): obj is MarkdownAstroData {
if (typeof obj === 'object' && obj !== null && obj.hasOwnProperty('frontmatter')) {
const { frontmatter } = obj as any;
try {
// ensure frontmatter is JSON-serializable
JSON.stringify(frontmatter);
} catch {
return false;
}
return typeof frontmatter === 'object' && frontmatter !== null;
}
return false;
}
export class InvalidAstroDataError extends TypeError {}
export function safelyGetAstroData(vfileData: Data): MarkdownAstroData | InvalidAstroDataError {
const { astro } = vfileData;
if (!astro || !isValidAstroData(astro)) {
return new InvalidAstroDataError();
}
return astro;
}
export function toRemarkInitializeAstroData({
userFrontmatter,
}: {
userFrontmatter: Record<string, any>;
}) {
return () =>
function (tree: any, vfile: VFile) {
if (!vfile.data.astro) {
vfile.data.astro = { frontmatter: userFrontmatter };
}
};
}
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