Change to replace Buffer with Uint8Array

Previously, `VFile` supported `Buffer`, which is Node.js-specific.
It changed to `Uint8Array`.
In most cases, this will be fine, because the Node `Buffer` class subclasses
`Uint8Array`.

Related-to: vfile/vfile@f4edd0d.

index.d.ts

@@ -111,7 +111,7 @@ export type Processor<
    *   *   If the plugin sets a parser, then this should be the node type that
    *       the parser yields.
    *   *   If the plugin sets a compiler, then this should be the result that
-   *       the compiler yields (`string`, `Buffer`, or something else).
+   *       the compiler yields (`string`, `Uint8Array`, or something else).
    * @param plugin
    *   Plugin (function) to use.
    *   Plugins are deduped based on identity: passing a function in twice will
@@ -162,7 +162,7 @@ export type Processor<
    *   *   If the plugin sets a parser, then this should be the node type that
    *       the parser yields.
    *   *   If the plugin sets a compiler, then this should be the result that
-   *       the compiler yields (`string`, `Buffer`, or something else).
+   *       the compiler yields (`string`, `Uint8Array`, or something else).
    * @param tuple
    *   A tuple where the first item is a plugin (function) to use and other
    *   items are options.
@@ -260,7 +260,7 @@ export type FrozenProcessor<
    * @param file
    *   `VFile` or anything that can be given to `new VFile()`, optional.
    * @returns
-   *   New content: compiled text (`string` or `Buffer`) or something else.
+   *   New content: compiled text (`string` or `Uint8Array`) or something else.
    *   This depends on which plugins you use: typically text, but could for
    *   example be a React node.
    */
@@ -347,8 +347,8 @@ export type FrozenProcessor<
    *
    * The result from the compiler is stored on the file.
    * What the result is depends on which plugins you use.
-   * The result is typically text (`string` or `Buffer`), which can be retrieved
-   * with `file.toString()` (or `String(file)`).
+   * The result is typically text (`string` or `Uint8Array`), which can be
+   * retrieved with `file.toString()` (or `String(file)`).
    * In some cases, such as when using `rehypeReact` to create a React node,
    * the result is stored on `file.result`.
    *
@@ -375,8 +375,8 @@ export type FrozenProcessor<
    *
    * The result from the compiler is stored on the file.
    * What the result is depends on which plugins you use.
-   * The result is typically text (`string` or `Buffer`), which can be retrieved
-   * with `file.toString()` (or `String(file)`).
+   * The result is typically text (`string` or `Uint8Array`), which can be
+   * retrieved with `file.toString()` (or `String(file)`).
    * In some cases, such as when using `rehypeReact` to create a React node,
    * the result is stored on `file.result`.
    *
@@ -399,8 +399,8 @@ export type FrozenProcessor<
    *
    * The result from the compiler is stored on the file.
    * What the result is depends on which plugins you use.
-   * The result is typically text (`string` or `Buffer`), which can be retrieved
-   * with `file.toString()` (or `String(file)`).
+   * The result is typically text (`string` or `Uint8Array`), which can be
+   * retrieved with `file.toString()` (or `String(file)`).
    * In some cases, such as when using `rehypeReact` to create a React node,
    * the result is stored on `file.result`.
    *
@@ -502,7 +502,7 @@ export type FrozenProcessor<
  *   *   If the plugin sets a parser, then this should be the node type that
  *       the parser yields.
  *   *   If the plugin sets a compiler, then this should be the result that
- *       the compiler yields (`string`, `Buffer`, or something else).
+ *       the compiler yields (`string`, `Uint8Array`, or something else).
  * @this
  *   The current processor.
  *   Plugins can configure the processor by interacting with `this.Parser` or
@@ -580,7 +580,7 @@ export type Preset = {
  *   *   If the plugin sets a parser, then this should be the node type that
  *       the parser yields.
  *   *   If the plugin sets a compiler, then this should be the result that
- *       the compiler yields (`string`, `Buffer`, or something else).
+ *       the compiler yields (`string`, `Uint8Array`, or something else).
  */
 export type PluginTuple<
   PluginParameters extends any[] = any[],
@@ -780,8 +780,8 @@ export class CompilerClass<Tree extends Node = Node, Result = unknown> {
      * Compile a tree.
      *
      * @returns
-     *   New content: compiled text (`string` or `Buffer`, for `file.value`) or
-     *   something else (for `file.result`).
+     *   New content: compiled text (`string` or `Uint8Array`, for
+     *   `file.value`) or something else (for `file.result`).
      */
     compile(): Result
   }
@@ -811,7 +811,7 @@ export class CompilerClass<Tree extends Node = Node, Result = unknown> {
  * @param file
  *   File associated with `tree`.
  * @returns
- *   New content: compiled text (`string` or `Buffer`, for `file.value`) or
+ *   New content: compiled text (`string` or `Uint8Array`, for `file.value`) or
  *   something else (for `file.result`).
  */
 export type CompilerFunction<Tree extends Node = Node, Result = unknown> = (

index.test-d.ts

@@ -524,27 +524,32 @@ expectType<string>(processorWithRehypeStringify.stringify(hastRoot))
 processorWithRehypeStringify.stringify(mdastRoot)
 expectType<VFile>(processorWithRehypeStringify.processSync(''))
 
-// Compile plugin (to a buffer).
-const rehypeStringifyBuffer: Plugin<[], HastRoot, Uint8Array> = function () {
-  // Empty.
-}
+// Compile plugin (to an `Uint8Array`).
+const rehypeStringifyUint8Array: Plugin<[], HastRoot, Uint8Array> =
+  function () {
+    // Empty.
+  }
 
-const processorWithRehypeStringifyBuffer = unified().use(rehypeStringifyBuffer)
+const processorWithRehypeStringifyUint8Array = unified().use(
+  rehypeStringifyUint8Array
+)
 
 // To do: ?
 expectType<Processor<HastRoot, HastRoot, HastRoot>>(
-  processorWithRehypeStringifyBuffer
+  processorWithRehypeStringifyUint8Array
 )
 // To do: yield `UnistNode`?
-expectType<HastRoot>(processorWithRehypeStringifyBuffer.parse(''))
+expectType<HastRoot>(processorWithRehypeStringifyUint8Array.parse(''))
 // @ts-expect-error: to do: accept `UnistNode`?
-processorWithRehypeStringifyBuffer.runSync(mdastRoot)
+processorWithRehypeStringifyUint8Array.runSync(mdastRoot)
 // To do: accept, yield `UnistNode`?
-expectType<HastRoot>(processorWithRehypeStringifyBuffer.runSync(hastRoot))
-expectType<Uint8Array>(processorWithRehypeStringifyBuffer.stringify(hastRoot))
+expectType<HastRoot>(processorWithRehypeStringifyUint8Array.runSync(hastRoot))
+expectType<Uint8Array>(
+  processorWithRehypeStringifyUint8Array.stringify(hastRoot)
+)
 // @ts-expect-error: not the correct node type.
-processorWithRehypeStringifyBuffer.stringify(mdastRoot)
-expectType<VFile>(processorWithRehypeStringifyBuffer.processSync(''))
+processorWithRehypeStringifyUint8Array.stringify(mdastRoot)
+expectType<VFile>(processorWithRehypeStringifyUint8Array.processSync(''))
 
 // Compile plugin (to a non-node).
 const rehypeReact: Plugin<[], HastRoot, ReactNode> = function () {

lib/index.js

@@ -18,7 +18,6 @@
 
 import structuredClone from '@ungap/structured-clone'
 import {bail} from 'bail'
-import isBuffer from 'is-buffer'
 import isPlainObj from 'is-plain-obj'
 import {trough} from 'trough'
 import {VFile} from 'vfile'
@@ -601,5 +600,22 @@ function looksLikeAVFile(value) {
  * @returns {value is VFileValue}
  */
 function looksLikeAVFileValue(value) {
-  return typeof value === 'string' || isBuffer(value)
+  return typeof value === 'string' || isUint8Array(value)
+}
+
+/**
+ * Assert `value` is an `Uint8Array`.
+ *
+ * @param {unknown} value
+ *   thing.
+ * @returns {value is Uint8Array}
+ *   Whether `value` is an `Uint8Array`.
+ */
+function isUint8Array(value) {
+  return Boolean(
+    value &&
+      typeof value === 'object' &&
+      'byteLength' in value &&
+      'byteOffset' in value
+  )
 }

package.json

@@ -48,7 +48,6 @@
     "@types/unist": "^3.0.0",
     "@ungap/structured-clone": "^1.0.0",
     "bail": "^2.0.0",
-    "is-buffer": "^2.0.0",
     "is-plain-obj": "^4.0.0",
     "trough": "^2.0.0",
     "vfile": "^6.0.0"

readme.md

@@ -526,10 +526,10 @@ Compile a syntax tree.
 
 ###### Returns
 
-Textual representation of the tree (`string` or `Buffer`, see note).
+Textual representation of the tree (`string` or `Uint8Array`, see note).
 
 > 👉 **Note**: unified typically compiles by serializing: most
-> [compilers][compiler] return `string` (or `Buffer`).
+> [compilers][compiler] return `string` (or `Uint8Array`).
 > Some compilers, such as the one configured with
 > [`rehype-react`][rehype-react], return other values (in this case, a React
 > tree).
@@ -575,7 +575,7 @@ Instances must have a `compile` method that is called without arguments and
 should return a `string`.
 
 > 👉 **Note**: unified typically compiles by serializing: most compilers
-> return `string` (or `Buffer`).
+> return `string` (or `Uint8Array`).
 > Some compilers, such as the one configured with
 > [`rehype-react`][rehype-react], return other values (in this case, a React
 > tree).
@@ -693,7 +693,7 @@ The parsed, transformed, and compiled value is available at
 [`file.value`][vfile-value] (see note).
 
 > 👉 **Note**: unified typically compiles by serializing: most
-> [compilers][compiler] return `string` (or `Buffer`).
+> [compilers][compiler] return `string` (or `Uint8Array`).
 > Some compilers, such as the one configured with
 > [`rehype-react`][rehype-react], result in other values (in this case, a React
 > tree).
@@ -805,7 +805,7 @@ The parsed, transformed, and compiled value is available at
 [`file.value`][vfile-value] (see note).
 
 > 👉 **Note**: unified typically compiles by serializing: most
-> [compilers][compiler] return `string` (or `Buffer`).
+> [compilers][compiler] return `string` (or `Uint8Array`).
 > Some compilers, such as the one configured with
 > [`rehype-react`][rehype-react], result in other values (in this case, a React
 > tree).

test/process-compilers.js

@@ -1,4 +1,3 @@
-import {Buffer} from 'node:buffer'
 import assert from 'node:assert/strict'
 import test from 'node:test'
 import {unified} from 'unified'
@@ -20,9 +19,9 @@ test('process (compilers)', async function (t) {
     assert.equal(file.result, undefined)
   })
 
-  await t.test('should compile `buffer`', async function () {
+  await t.test('should compile `Uint8Array`', async function () {
     const processor = unified()
-    const result = Buffer.from('bravo')
+    const result = new Uint8Array([0xef, 0xbb, 0xbf, 0x61, 0x62, 0x63])
 
     processor.Parser = SimpleParser
     processor.Compiler = function () {