Programmatic control methods are missing in typescript declaration

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Steps to reproduce

Try to use

vue-multiselect/documentation/partials/examples/ProgrammaticCtrl.vue

Line 48 in 8b65e2a

this.$refs.multiselect.activate()

in a project with typescript

Expected behaviour

It works with Typescript as in the docs with Javascript.

because activate/deactivate is defined in

vue-multiselect/index.d.ts

Line 6 in ee7bf21

declare class Multiselect extends Vue { }

in a similar way as in another project https://github.com/bootstrap-vue/bootstrap-vue/blob/45635d1d391263192787e9e0bddc004abe115ace/src/components/modal/index.d.ts#L9-L13

In this case it would be something like this:

declare class Multiselect extends Vue {
  activate: () => void
  deactivate: () => void
}

Actual behaviour

You'll get an error like:

Property 'activate' does not exist on type 'Multiselect'.

because it's not defined in

vue-multiselect/index.d.ts

Line 6 in 8b65e2a

declare class Multiselect extends Vue { }