Add null check to getNewCanvasAndCtx

Cho, Yongjoon · Donaldcwl · commit c43089666aed · 2020-03-14T20:06:48.000+08:00
Resolves #18
diff --git a/lib/utils.js b/lib/utils.js
@@ -261,7 +261,7 @@ export function getNewCanvasAndCtx (width, height) {
     canvas = new OffscreenCanvas(width, height)
     ctx = canvas.getContext('2d')
     if (ctx === null) {
-      throw new Error('getContext of OffscreenCanvas returns null')
+      throw new Error("getContext of OffscreenCanvas returns null")
     }
   } catch (e) {
     canvas = document.createElement('canvas')

Original file line number	Diff line number	Diff line change
`@@ -261,7 +261,7 @@ export function getNewCanvasAndCtx (width, height) {`
`261`	`261`	`canvas = new OffscreenCanvas(width, height)`
`262`	`262`	`ctx = canvas.getContext('2d')`
`263`	`263`	`if (ctx === null) {`
`264`		`- throw new Error('getContext of OffscreenCanvas returns null')`
	`264`	`+ throw new Error("getContext of OffscreenCanvas returns null")`
`265`	`265`	`}`
`266`	`266`	`} catch (e) {`
`267`	`267`	`canvas = document.createElement('canvas')`