fix(svelte-query): Add try/catch to getIsRestoringContext (#6193)

Co-authored-by: Dominik Dorfmeister <office@dorfmeister.cc>
Co-authored-by: Lachlan Collins <1667261+lachlancollins@users.noreply.github.com>

Author: 3 people

packages/svelte-query/src/__tests__/context.test.ts

@@ -0,0 +1,8 @@
+import { describe, expect, it } from 'vitest'
+import { getIsRestoringContext } from '../context'
+
+describe('getIsRestoringContext', () => {
+  it('Should not throw when called outside of a component', async () => {
+    expect(() => getIsRestoringContext()).to.not.throw()
+  })
+})

packages/svelte-query/src/context.ts

@@ -26,9 +26,14 @@ const _isRestoringContextKey = '$$_isRestoring'
 
 /** Retrieves a `isRestoring` from Svelte's context */
 export const getIsRestoringContext = (): Readable<boolean> => {
-  const isRestoring = getContext(_isRestoringContextKey)
-  if (!isRestoring) return readable(false)
-  return isRestoring as Readable<boolean>
+  try {
+    const isRestoring = getContext<Readable<boolean> | undefined>(
+      _isRestoringContextKey,
+    )
+    return isRestoring ? isRestoring : readable(false)
+  } catch (error) {
+    return readable(false)
+  }
 }
 
 /** Sets a `isRestoring` on Svelte's context */