Requires typescript to be installed in project

[JessicaSachs]

A basic Vue 3 project in Javascript, created with Vue CLI, throws an error when trying to run any spec because typescript isn't installed.

We shouldn't require typescript to be installed.

 Test suite failed to run

    Cannot find module 'typescript'
    Require stack:
    - /Users/jess/projects/personal/vue-uke/node_modules/vue-jest/lib/process.js
    - /Users/jess/projects/personal/vue-uke/node_modules/vue-jest/lib/index.js
    - /Users/jess/projects/personal/vue-uke/node_modules/@jest/transform/build/ScriptTransformer.js
    - /Users/jess/projects/personal/vue-uke/node_modules/@jest/transform/build/index.js
    - /Users/jess/projects/personal/vue-uke/node_modules/jest-runtime/build/index.js
    - /Users/jess/projects/personal/vue-uke/node_modules/@jest/core/build/cli/index.js
    - /Users/jess/projects/personal/vue-uke/node_modules/@jest/core/build/jest.js
    - /Users/jess/projects/personal/vue-uke/node_modules/jest-cli/build/cli/index.js
    - /Users/jess/projects/personal/vue-uke/node_modules/jest-cli/bin/jest.js
    - /Users/jess/projects/personal/vue-uke/node_modules/jest/bin/jest.js