WIP - add extractor, generate snippet_data

node_modules/@jimp/utils/README.md

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+<div align="center">
+  <img width="200" height="200"
+    src="https://s3.amazonaws.com/pix.iemoji.com/images/emoji/apple/ios-11/256/crayon.png">
+  <h1>@jimp/utils</h1>
+  <p>Utils for jimp extensions.</p>
+</div>
+
+## Available Methods
+
+### isNodePattern
+
+Determines if function was passed an node callback.
+
+```js
+if (isNodePattern(cb)) {
+  cb.call(this, null, this);
+}
+```
+
+### throwError
+
+Either throws the error or calls the callback with the error.
+
+```js
+if (/* check for error */) {
+  return throwError.call(this, 'someError', cb);
+}
+```
+
+### scan
+
+Scans through a region of the bitmap, calling a function for each pixel.
+
+```js
+function removeRed(image) {
+  return scan(image, 0, 0, image.bitmap.width, image.bitmap.height, function(
+    x,
+    y,
+    index
+  ) {
+    const red = this.bitmap.data[index + 0];
+    const green = this.bitmap.data[index + 1];
+    const blue = this.bitmap.data[index + 2];
+    const alpha = this.bitmap.data[index + 3];
+
+    this.bitmap.data[index + 0] = 0;
+    this.bitmap.data[index + 1] = green;
+    this.bitmap.data[index + 2] = blue;
+    this.bitmap.data[index + 3] = alpha;
+  });
+}
+```