Read the node tables backwards, a directive to the node and marks it names

src/markdown/emit/block-directive-spelling.ts

@@ -1,8 +1,8 @@
-import type { AdfMark, AdfNode } from '../../adf/document.ts'
+import type { AdfNode } from '../../adf/document.ts'
 import type { BlockDirective } from '../../adf/block-directives.ts'
-import type { JsonValue } from '../../json-value.ts'
 import { blockArgument } from '../block-directive-arguments.ts'
 import { isBareToken, spellAttributes, spellJsonAttribute, spellVocabulary } from '../directive-syntax.ts'
+import { markValues, marksAttribute } from '../block-directive-marks.ts'
 import { vocabularyPairs } from '../../adf/attribute-vocabulary.ts'
 
 export function spellDirectiveHeader(node: AdfNode, directive: BlockDirective, spelledByBody: readonly string[] = []): string | undefined {
@@ -14,7 +14,7 @@ export function spellDirectiveHeader(node: AdfNode, directive: BlockDirective, s
   if (pairs === undefined) return undefined
   const spelledPairs = spellVocabulary(pairs)
   const marks = node.marks ?? []
-  if (marks.length > 0) spelledPairs.push(['marks', spellJsonAttribute(markValues(marks))])
+  if (marks.length > 0) spelledPairs.push([marksAttribute, spellJsonAttribute(markValues(marks))])
   const attributes = spellAttributes(spelledPairs)
   return `${node.type}${argument}${attributes === '' ? '' : ` ${attributes}`}`
 }
@@ -25,10 +25,3 @@ function spellArgument(node: AdfNode, argumentAttribute: string | undefined): st
   if (typeof value !== 'string' || !isBareToken(value)) return undefined
   return ` ${value}`
 }
-
-function markValues(marks: readonly AdfMark[]): JsonValue {
-  return marks.map((mark) => {
-    const attrs = mark.attrs ?? {}
-    return Object.keys(attrs).length === 0 ? { type: mark.type } : { attrs, type: mark.type }
-  })
-}