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Description
Version
1.0.0-beta.16
Reproduction link
https://github.com/Yawenina/vue-test-utils-classes
Steps to reproduce
npm install
npm run serve
What is expected?
no error
What is actually happening?
In my test file, I write a test like this:
expect(wrapper.classes().includes('a')).toBe(false);
but when I ran npm run serve
, typescript yield an error:
ERROR in vue-test-utils-classes/tests/unit/HelloWorld.spec.ts
10:30 Property 'includes' does not exist on type 'void | string[]'.
Property 'includes' does not exist on type 'void'.
8 | propsData: { msg },
9 | });
> 10 | expect(wrapper.classes().includes('a')).toBe(false);
| ^
11 | });
12 | });
13 |
Version: typescript 2.9.1
I read the source code and find the type definition of the classes()
method is this:
classes(): Array<string> | void
Maybe because the return value could be void so it does not have a includes
method.
When I change it to :
classes(): Array<string>
the error disappears and everything works ok.