Fix to not generate blank lines for phrasing roots

lib/handle/root.js

@@ -5,7 +5,9 @@
  * @typedef {import('../types.js').Info} Info
  */
 
+import {phrasing} from 'mdast-util-phrasing'
 import {containerFlow} from '../util/container-flow.js'
+import {containerPhrasing} from '../util/container-phrasing.js'
 
 /**
  * @param {Root} node
@@ -15,5 +17,9 @@ import {containerFlow} from '../util/container-flow.js'
  * @returns {string}
  */
 export function root(node, _, state, info) {
-  return containerFlow(node, state, info)
+  // Note: `html` nodes are ambiguous.
+  const hasPhrasing = node.children.some((d) => phrasing(d))
+  const fn = hasPhrasing ? containerPhrasing : containerFlow
+  // @ts-expect-error: `root`s are supposed to have one type of content
+  return fn(node, state, info)
 }

lib/types.js

@@ -3,51 +3,46 @@
  * @typedef {import('unist').Point} Point
  * @typedef {import('mdast').Root} Root
  * @typedef {import('mdast').Content} Content
- * @typedef {Root | Content} Node
- * @typedef {Extract<Node, UnistParent>} Parent
+ * @typedef {import('mdast').TopLevelContent} TopLevelContent
+ * @typedef {import('mdast').ListContent} ListContent
+ * @typedef {import('mdast').PhrasingContent} PhrasingContent
  */
 
 /**
+ * @typedef {Root | Content} Node
+ * @typedef {Extract<Node, UnistParent>} Parent
+ * @typedef {TopLevelContent | ListContent} FlowContent
+ *
  * @typedef TrackFields
  *   Info on where we are in the document we are generating.
  * @property {Point} now
  *   Current point.
  * @property {number} lineShift
  *   Number of columns each line will be shifted by wrapping nodes.
- */
-
-/**
+ *
  * @typedef SafeFields
  *   Info on the characters that are around the current thing we are
  *   generating.
  * @property {string} before
  *   Characters before this (guaranteed to be one, can be more).
  * @property {string} after
  *   Characters after this (guaranteed to be one, can be more).
- */
-
-/**
+ *
  * @typedef {TrackFields & SafeFields} Info
  *   Info on the surrounding of the node that is serialized.
- */
-
-/**
+ *
  * @callback Enter
  *   Enter something.
  * @param {string} type
  *   Label, more similar to a micromark event than an mdast node type.
  * @returns {Exit}
  *   Revert.
- */
-
-/**
+ *
  * @callback Exit
  *   Exit something.
  * @returns {void}
  *   Nothing.
- */
-
-/**
+ *
  * @typedef State
  *   Info passed around about the current state.
  * @property {Array<string>} stack
@@ -70,9 +65,7 @@
  *   List marker currently in use.
  * @property {string | undefined} bulletLastUsed
  *   List marker previously in use.
- */
-
-/**
+ *
  * @callback Handle
  *   Handle a particular node.
  * @param {any} node
@@ -85,16 +78,12 @@
  *   Info on the surrounding of the node that is serialized.
  * @returns {string}
  *   Serialized markdown representing `node`.
- */
-
-/**
+ *
  * @typedef {Record<string, Handle>} Handlers
  *   Handle particular nodes.
  *
  *   Each key is a node type, each value its corresponding handler.
- */
-
-/**
+ *
  * @callback Join
  *   How to join two blocks.
  *
@@ -131,9 +120,7 @@
  *    > One such example is when returning `0` for two paragraphs, which will
  *    > result in the text running together, and in the future to be seen as
  *    > one paragraph.
- */
-
-/**
+ *
  * @typedef Unsafe
  *   Schema that defines when a character cannot occur.
  * @property {string} character
@@ -153,9 +140,7 @@
  *   The unsafe pattern (this whole object) compiled as a regex.
  *
  *   This is internal and must not be defined.
- */
-
-/**
+ *
  * @typedef Options
  *   Configuration (optional).
  * @property {'-' | '*' | '+' | null | undefined} [bullet='*']

lib/util/container-flow.js

@@ -1,4 +1,5 @@
 /**
+ * @typedef {import('../types.js').FlowContent} FlowContent
  * @typedef {import('../types.js').Node} Node
  * @typedef {import('../types.js').Parent} Parent
  * @typedef {import('../types.js').State} State
@@ -8,7 +9,7 @@
 import {track} from './track.js'
 
 /**
- * @param {Parent} parent
+ * @param {Parent & {children: Array<FlowContent>}} parent
  * @param {State} state
  * @param {TrackFields} info
  * @returns {string}

lib/util/container-phrasing.js

@@ -1,4 +1,5 @@
 /**
+ * @typedef {import('../types.js').PhrasingContent} PhrasingContent
  * @typedef {import('../types.js').Parent} Parent
  * @typedef {import('../types.js').Info} Info
  * @typedef {import('../types.js').Handle} Handle
@@ -8,7 +9,7 @@
 import {track} from './track.js'
 
 /**
- * @param {Parent} parent
+ * @param {Parent & {children: Array<PhrasingContent>}} parent
  * @param {State} state
  * @param {Info} info
  * @returns {string}

lib/util/indent-lines.js

@@ -18,7 +18,7 @@ export function indentLines(value, map) {
   const result = []
   let start = 0
   let line = 0
-  /** @type {RegExpExecArray|null} */
+  /** @type {RegExpExecArray | null} */
   let match
 
   while ((match = eol.exec(value))) {

package.json

@@ -41,6 +41,7 @@
     "@types/mdast": "^3.0.0",
     "@types/unist": "^2.0.0",
     "longest-streak": "^3.0.0",
+    "mdast-util-phrasing": "^3.0.0",
     "mdast-util-to-string": "^3.0.0",
     "micromark-util-decode-string": "^1.0.0",
     "unist-util-visit": "^4.0.0",

test/index.js

@@ -23,6 +23,19 @@ test('core', () => {
     'should support a `root`'
   )
 
+  assert.equal(
+    to({
+      type: 'root',
+      children: [
+        {type: 'text', value: 'a'},
+        {type: 'break'},
+        {type: 'text', value: 'b'}
+      ]
+    }),
+    'a\\\nb\n',
+    'should not use blank lines between nodes when given phrasing'
+  )
+
   assert.equal(
     to({
       type: 'root',