Cannot find namespace 'SegmentAnalytics'.

[dwjohnston]

Repro:

1. Create a new create-react-app with the TypeScript template
2. Change version down to 16. (see: https://github.com/segmentio/typewriter/issues/209)
3. Add typewriter yarn add -D typewriter
4. Init typewriter npx typewriter init Initialise the typewriter boilerplate in src/analytics

Open src/analytics/index.ts - You will see:

let analytics: () => SegmentAnalytics.AnalyticsJS | undefined = () => {
	return window.analytics
}

With the error:

Cannot find namespace 'SegmentAnalytics'.ts(2503)

[dwjohnston]

Installing @types/segment-analytics solves this problem.

It should be included as a dependency, or put in the installation instructions?