Update index.ts

[Seifeldin-Sabry]

exporting type to surpress the TS error: 'Re-exporting a type when 'isolatedModules' is enabled requires using 'export type'.'

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Summary

It was just a slight syntax to pass typescript Typechecking

Motivation

Explain the motivation for making this change. What existing problem does the pull request solve?

When using the token provider, app fails the type checks due to a missed syntax when re-exporting types.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[Peter-512]

LGTM