fix input validation for some Jest environments

mourner · mourner · commit 05fac1845c7a · 2019-06-10T14:16:36.000+03:00
Closes #62.
diff --git a/index.js b/index.js
@@ -81,7 +81,8 @@ function pixelmatch(img1, img2, output, width, height, options) {
 }
 
 function isPixelData(arr) {
-    return arr instanceof Uint8Array || arr instanceof Uint8ClampedArray;
+    // work around instanceof Uint8Array not working properly in some Jest environments
+    return ArrayBuffer.isView(arr) && arr.constructor.BYTES_PER_ELEMENT === 1;
 }
 
 // check if a pixel is likely a part of anti-aliasing;

Original file line number	Diff line number	Diff line change
`@@ -81,7 +81,8 @@ function pixelmatch(img1, img2, output, width, height, options) {`
`81`	`81`	`}`
`82`	`82`
`83`	`83`	`function isPixelData(arr) {`
`84`		`- return arr instanceof Uint8Array \|\| arr instanceof Uint8ClampedArray;`
	`84`	`+ // work around instanceof Uint8Array not working properly in some Jest environments`
	`85`	`+ return ArrayBuffer.isView(arr) && arr.constructor.BYTES_PER_ELEMENT === 1;`
`85`	`86`	`}`
`86`	`87`
`87`	`88`	`// check if a pixel is likely a part of anti-aliasing;`