feat: export MergeKey type

Author: danielbayley

src/schema/yaml-1.1/merge.ts

@@ -14,6 +14,8 @@ import type { ScalarTag } from '../types.ts'
 
 export const MERGE_KEY: unique symbol = Symbol.for('<<')
 
+export type MergeKey = typeof MERGE_KEY
+
 export const merge: ScalarTag & {
   identify(value: unknown): boolean
   test: RegExp

src/util.ts

@@ -9,7 +9,7 @@ export { findPair } from './nodes/YAMLMap.ts'
 export { map as mapTag } from './schema/common/map.ts'
 export { seq as seqTag } from './schema/common/seq.ts'
 export { string as stringTag } from './schema/common/string.ts'
-export { isMergeKey, MERGE_KEY } from './schema/yaml-1.1/merge.ts'
+export { isMergeKey, MERGE_KEY, type MergeKey } from './schema/yaml-1.1/merge.ts'
 export { foldFlowLines } from './stringify/foldFlowLines.ts'
 export type { FoldOptions } from './stringify/foldFlowLines.ts'
 export type { StringifyContext } from './stringify/stringify.ts'