diff --git a/src/generator.js b/src/generator.js
index e3bf382..e46ffdc 100644
--- a/src/generator.js
+++ b/src/generator.js
@@ -24,6 +24,7 @@ import {
   loadCSL,
   loadLocale,
   getCitationFormat,
+  getFrontmatterField,
 } from './utils.js'
 
 const defaultCiteFormat = 'apa'
@@ -46,11 +47,11 @@ const rehypeCitationGenerator = (Cite) => {
       /** @type {string[]} */
       let bibtexFile = []
       const inputCiteformat =
-        /** @type {string} */ // @ts-ignore
-        options.csl || file?.data?.matter?.csl || file?.data?.frontmatter?.csl || defaultCiteFormat
+        /** @type {string} */
+        options.csl || getFrontmatterField(file, 'csl') || defaultCiteFormat
       const noCite =
-        /**  @type {string[] | false} */ // @ts-ignore
-        options.noCite || file?.data?.matter?.noCite || file?.data?.frontmatter?.noCite || false
+        /**  @type {string[] | false} */
+        options.noCite || getFrontmatterField(file, 'noCite') || false
       const inputLang = options.lang || 'en-US'
       const config = Cite.plugins.config.get('@csl')
       const citeFormat = await loadCSL(Cite, inputCiteformat, options.path)
@@ -73,7 +74,7 @@ const rehypeCitationGenerator = (Cite) => {
           }
         }
       }
-      const citations = new Cite(bibtexFile, {generateGraph: false})
+      const citations = new Cite(bibtexFile, { generateGraph: false })
       const citationIds = citations.data.map((x) => x.id)
       const citationPre = []
       const citationDict = {}
@@ -147,7 +148,6 @@ const rehypeCitationGenerator = (Cite) => {
         ]
       })
 
-
       if (noCite) {
         if (noCite.length === 1 && noCite[0] === '@*') {
           citeproc.updateItems(citationIds)
diff --git a/src/utils.js b/src/utils.js
index adc8f5b..df80dbc 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -44,17 +44,16 @@ export const isValidHttpUrl = (str) => {
 export const getBibliography = async (options, file) => {
   /** @type {string[]} */
   let bibliography = []
+  const frontmatterBibliography = getFrontmatterField(file, 'bibliography')
   if (options.bibliography) {
     bibliography =
       typeof options.bibliography === 'string' ? [options.bibliography] : options.bibliography
-    // @ts-ignore
-  } else if (file?.data?.frontmatter?.bibliography) {
+  } else if (frontmatterBibliography) {
     bibliography =
-      // @ts-ignore
-      typeof file.data.frontmatter.bibliography === 'string'
-        ? [file.data.frontmatter.bibliography]
-        : file.data.frontmatter.bibliography
-  }   
+      typeof frontmatterBibliography === 'string'
+        ? [frontmatterBibliography]
+        : frontmatterBibliography
+  }
   // If local path, get absolute path
   for (let i = 0; i < bibliography.length; i++) {
     if (!isValidHttpUrl(bibliography[i])) {
@@ -67,7 +66,6 @@ export const getBibliography = async (options, file) => {
       }
     }
   }
-  
 
   return bibliography
 }
@@ -197,3 +195,31 @@ export const isSameAuthor = (item, item2) => {
   }
   return true
 }
+
+/**
+ * @typedef {Object} FrontmatterSource
+ * @property {Record<string, any>} [matter]
+ * @property {Record<string, any>} [frontmatter]
+ * @property {{ frontmatter?: Record<string, any> }} [astro]
+ */
+
+/**
+ * @param {{ data?: FrontmatterSource }} file
+ * @param {string} fieldName
+ * @returns {any}
+ */
+export const getFrontmatterField = (file, fieldName) => {
+  if (!file || !file.data) {
+    return undefined
+  }
+
+  const sources = [file.data.matter, file.data.frontmatter, file.data.astro?.frontmatter]
+
+  for (const source of sources) {
+    if (source && fieldName in source) {
+      return source[fieldName]
+    }
+  }
+
+  return undefined
+}