35 lines
846 B
JavaScript
35 lines
846 B
JavaScript
function isValidAstroData(obj) {
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if (typeof obj === "object" && obj !== null && obj.hasOwnProperty("frontmatter")) {
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const { frontmatter } = obj;
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try {
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JSON.stringify(frontmatter);
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} catch {
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return false;
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}
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return typeof frontmatter === "object" && frontmatter !== null;
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}
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return false;
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}
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class InvalidAstroDataError extends TypeError {
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}
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function safelyGetAstroData(vfileData) {
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const { astro } = vfileData;
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if (!astro || !isValidAstroData(astro)) {
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return new InvalidAstroDataError();
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}
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return astro;
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}
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function toRemarkInitializeAstroData({
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userFrontmatter
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}) {
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return () => function(tree, vfile) {
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if (!vfile.data.astro) {
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vfile.data.astro = { frontmatter: userFrontmatter };
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}
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};
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}
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export {
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InvalidAstroDataError,
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safelyGetAstroData,
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toRemarkInitializeAstroData
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};
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