Add test

__test__/index.spec.ts

@@ -2,7 +2,7 @@ import { promises as fs } from 'fs'
 
 import test from 'ava'
 
-import { to4Bpp, toMonochrome } from '../index'
+import { to4Bpp, to4BppWithTextMetadata, toMonochrome } from '../index'
 
 test('Read test1 and convert to 4bpp', async (t) => {
   const input = await fs.readFile('./__test__/test1.png')
@@ -31,3 +31,10 @@ test('Read chickenfeet and convert to monochrome', async (t) => {
   t.true(output !== undefined)
   await fs.writeFile('./__test__/chickenfeet-mono.png', output)
 })
+
+test('Read chickenfeet and convert to 4bpp with tEXt', async (t) => {
+  const input = await fs.readFile('./__test__/chickenfeet.jpg')
+  const output = await to4BppWithTextMetadata(input, {"foo": "bar", "test": "567"}, false)
+  t.true(output !== undefined)
+  await fs.writeFile('./__test__/chickenfeet-4bpp-with-tEXt.png', output)
+})

index.d.ts

@@ -8,6 +8,12 @@ export declare function to4Bpp(
   format?: string | undefined | null,
   signal?: AbortSignal | undefined | null,
 ): Promise<Buffer>
+export declare function to4BppWithTextMetadata(
+  image: Buffer,
+  textChunks?: Record<string, string> | undefined | null,
+  compressed?: boolean | undefined | null,
+  signal?: AbortSignal | undefined | null,
+): Promise<Buffer>
 export declare function toMonochrome(
   image: Buffer,
   format?: string | undefined | null,

index.js

@@ -284,8 +284,9 @@ if (!nativeBinding) {
   throw new Error(`Failed to load native binding`)
 }
 
-const { to4Bpp, toMonochrome, VERSION } = nativeBinding
+const { to4Bpp, to4BppWithTextMetadata, toMonochrome, VERSION } = nativeBinding
 
 module.exports.to4Bpp = to4Bpp
+module.exports.to4BppWithTextMetadata = to4BppWithTextMetadata
 module.exports.toMonochrome = toMonochrome
 module.exports.VERSION = VERSION