LanguageServiceHost.readFile is no longer optional

[mjbvz]

Bug Report

🔎 Search Terms

• typescript.d.ts

🕗 Version & Regression Information

4.7.0-dev.20220315

⏯ Playground Link

NA

Bug

In typescript.d.ts, LanguageServiceHost.readFile is no longer marked as an optional method in 4.7.0-dev.20220315 (checked by running npm install typescript@next)

This method was still optional in 4.7.0-dev.20220303 and I also see the method is optional in main:

TypeScript/lib/typescript.d.ts

Line 5551 in 5f017df

readFile?(path: string, encoding?: string): string | undefined;

[mjbvz]

From @weswigham it sounds like this is by-design. Will look into adopting it for VS Code