Add toUint8Array for output backed by transferable ArrayBuffer #4355

lib/output.js

@@ -164,6 +164,41 @@ function toBuffer (options, callback) {
   return this._pipeline(is.fn(options) ? options : callback, stack);
 }
 
+/**
+ * Write output to a `Uint8Array` backed by a transferable `ArrayBuffer`.
+ * JPEG, PNG, WebP, AVIF, TIFF, GIF and raw pixel data output are supported.
+ *
+ * Use {@link #toformat toFormat} or one of the format-specific functions such as {@link #jpeg jpeg}, {@link #png png} etc. to set the output format.
+ *
+ * If no explicit format is set, the output format will match the input image, except SVG input which becomes PNG output.
+ *
+ * By default all metadata will be removed, which includes EXIF-based orientation.
+ * See {@link #keepexif keepExif} and similar methods for control over this.
+ *
+ * Resolves with an `Object` containing:
+ * - `data` is the output image as a `Uint8Array` backed by a transferable `ArrayBuffer`.
+ * - `info` contains properties relating to the output image such as `width` and `height`.
+ *
+ * @since v0.35.0
+ *
+ * @example
+ * const { data, info } = await sharp(input).toUint8Array();
+ *
+ * @example
+ * const { data } = await sharp(input)
+ *   .avif()
+ *   .toUint8Array();
+ * const base64String = data.toBase64();
+ *
+ * @returns {Promise<{ data: Uint8Array, info: Object }>}
+ */
+function toUint8Array () {
+  this.options.resolveWithObject = true;
+  this.options.typedArrayOut = true;
+  const stack = Error();
+  return this._pipeline(null, stack);
+}
+
 /**
  * Keep all EXIF metadata from the input image in the output image.
  *
@@ -1659,6 +1694,7 @@ module.exports = (Sharp) => {
     // Public
     toFile,
     toBuffer,
+    toUint8Array,
     keepExif,
     withExif,
     withExifMerge,