fix(sets): check for window to avoid SSR errors (#511)

TheAlexLichter · web-flow · commit 9ea723045021 · 2020-09-12T15:08:30.000+08:00
diff --git a/src/utils/sets.ts b/src/utils/sets.ts
@@ -1,4 +1,4 @@
-if (!('WeakSet' in window)) {
+if (typeof window !== 'undefined' && !('WeakSet' in window)) {
   // simple polyfil for IE
   Object.defineProperty(window, 'WeakSet', {
     value: new (class {

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-if (!('WeakSet' in window)) {`
	`1`	`+if (typeof window !== 'undefined' && !('WeakSet' in window)) {`
`2`	`2`	`// simple polyfil for IE`
`3`	`3`	`Object.defineProperty(window, 'WeakSet', {`
`4`	`4`	`value: new (class {`