feat: empty content message

docs/guide/using-mdx.md

@@ -315,7 +315,7 @@ export const mdxBundle = (options: MdxOptions = {}) =>
   custom<string>().transform<string>(async (value, { meta: { path, content, config }, addIssue }) => {
     value = value ?? content
     if (value == null) {
-      addIssue({ fatal: true, code: 'custom', message: 'Empty content' })
+      addIssue({ fatal: true, code: 'custom', message: 'The content is empty' })
       return null as never
     }
 

src/schemas/excerpt.ts

@@ -16,10 +16,10 @@ export interface ExcerptOptions {
 }
 
 export const excerpt = ({ length = 260 }: ExcerptOptions = {}) =>
-  custom<string | null | undefined>().transform<string>(async (value, { meta: { plain }, addIssue }) => {
+  custom<string | undefined>(i => i === undefined || typeof i === 'string').transform<string>(async (value, { meta: { plain }, addIssue }) => {
     value = value ?? plain
     if (value == null || value.length === 0) {
-      addIssue({ code: 'custom', message: 'Empty content' })
+      addIssue({ code: 'custom', message: 'The content is empty' })
       return ''
     }
 

src/schemas/markdown.ts

@@ -39,10 +39,10 @@ const rehypeMetaString = () => (tree: Hast) => {
 }
 
 export const markdown = (options: MarkdownOptions = {}) =>
-  custom<string | null | undefined>().transform<string>(async (value, { meta: { path, content, config }, addIssue }) => {
+  custom<string | undefined>(i => i === undefined || typeof i === 'string').transform<string>(async (value, { meta: { path, content, config }, addIssue }) => {
     value = value ?? content
     if (value == null || value.length === 0) {
-      addIssue({ code: 'custom', message: 'Empty content' })
+      addIssue({ code: 'custom', message: 'The content is empty' })
       return ''
     }
 

src/schemas/mdx.ts

@@ -18,10 +18,10 @@ const remarkRemoveComments = () => (tree: Root) => {
 }
 
 export const mdx = (options: MdxOptions = {}) =>
-  custom<string | null | undefined>().transform<string>(async (value, { meta: { path, content, config }, addIssue }) => {
+  custom<string | undefined>(i => i === undefined || typeof i === 'string').transform<string>(async (value, { meta: { path, content, config }, addIssue }) => {
     value = value ?? content
     if (value == null || value.length === 0) {
-      addIssue({ code: 'custom', message: 'Empty content' })
+      addIssue({ code: 'custom', message: 'The content is empty' })
       return ''
     }
 

src/schemas/metadata.ts

@@ -60,10 +60,10 @@ export interface Metadata {
 }
 
 export const metadata = () =>
-  custom<string | null | undefined>().transform<Metadata>(async (value, { meta: { plain }, addIssue }) => {
+  custom<string | undefined>(i => i === undefined || typeof i === 'string').transform<Metadata>(async (value, { meta: { plain }, addIssue }) => {
     value = value ?? plain
     if (value == null || value.length === 0) {
-      addIssue({ code: 'custom', message: 'Empty content' })
+      addIssue({ code: 'custom', message: 'The content is empty' })
       return { readingTime: 0, wordCount: 0 }
     }
 

src/schemas/path.ts

@@ -23,7 +23,7 @@ export interface PathOptions {
  * @returns flattened path based on the file path
  */
 export const path = (options?: PathOptions) =>
-  custom<string | null | undefined>().transform<string>(async (value, { meta: { path, config }, addIssue }) => {
+  custom<string | undefined>(i => i === undefined || typeof i === 'string').transform<string>(async (value, { meta: { path, config }, addIssue }) => {
     if (value != null) {
       addIssue({ fatal: false, code: 'custom', message: '`s.path()` schema will resolve the flattening path based on the file path' })
     }

src/schemas/raw.ts

@@ -1,3 +1,4 @@
 import { custom } from './zod'
 
-export const raw = () => custom<string | null | undefined>().transform<string>(async (value, { meta: { content } }) => value ?? content ?? '')
+export const raw = () =>
+  custom<string | undefined>(i => i === undefined || typeof i === 'string').transform<string>(async (value, { meta: { content } }) => value ?? content ?? '')

src/schemas/toc.ts

@@ -98,21 +98,23 @@ const parse = (tree?: List): TocEntry[] => {
 }
 
 export const toc = <T extends TocOptions>(options?: T) =>
-  custom<string | null | undefined>().transform<T extends { original: true } ? TocTree : TocEntry[]>(async (value, { meta, addIssue }) => {
-    if (value == null || value.length === 0) {
-      addIssue({ code: 'custom', message: 'Empty content' })
-      return (options?.original ? {} : []) as T extends { original: true } ? TocTree : TocEntry[]
+  custom<string | undefined>(i => i === undefined || typeof i === 'string').transform<T extends { original: true } ? TocTree : TocEntry[]>(
+    async (value, { meta, addIssue }) => {
+      if (value == null || value.length === 0) {
+        addIssue({ code: 'custom', message: 'The content is empty' })
+        return (options?.original ? {} : []) as T extends { original: true } ? TocTree : TocEntry[]
+      }
+      try {
+        // extract ast tree from markdown/mdx content
+        const tree = value != null ? fromMarkdown(value) : meta.mdast
+        if (tree == null) throw new Error('No tree found')
+        const tocTree = extractToc(tree, options)
+        // return the original tree if requested
+        if (options?.original) return tocTree as T extends { original: true } ? TocTree : TocEntry[]
+        return parse(tocTree.map) as T extends { original: true } ? TocTree : TocEntry[]
+      } catch (err: any) {
+        addIssue({ fatal: true, code: 'custom', message: err.message })
+        return null as never
+      }
     }
-    try {
-      // extract ast tree from markdown/mdx content
-      const tree = value != null ? fromMarkdown(value) : meta.mdast
-      if (tree == null) throw new Error('No tree found')
-      const tocTree = extractToc(tree, options)
-      // return the original tree if requested
-      if (options?.original) return tocTree as T extends { original: true } ? TocTree : TocEntry[]
-      return parse(tocTree.map) as T extends { original: true } ? TocTree : TocEntry[]
-    } catch (err: any) {
-      addIssue({ fatal: true, code: 'custom', message: err.message })
-      return null as never
-    }
-  })
+  )