Typescript: npm install without --save-dev suggested as Quick fix for missing type.

[sidharthv96]

• VSCode Version: 1.49.1
• OS Version: macOS 10.15.6 (19G2021)

Steps to Reproduce:

1. Create a Typescript Project
2. Add an import x from async; ( or any other project without native types)
3. The following error shows up.

Could not find a declaration file for module 'async'. '<path>' implicitly has an 'any' type.
Try `npm install @types/async` if it exists or add a new declaration (.d.ts) file containing `declare module 'async';`

The command listed is npm install @types/async but it should actually be npm install --save-dev @types/async as types are only a devDependency.

This is a simple text change, I can raise a PR if someone can point me towards the file throwing the error.

Does this issue occur when all extensions are disabled?: N/A

[mjbvz]

The quick fix for this runs npm install --save-dev so I think the string just needs to be updated too

[andrewbranch]

I can raise a PR

Thanks!

1. Update the message in this file: https://github.com/microsoft/TypeScript/blob/master/src/compiler/diagnosticMessages.json
2. npm run build
3. There will be a build error that points you to the place(s) that need to be updated subsequently

[sidharthv96]

I'm also updating the install commands for node, jQuery, jest and mocha types.

[DanielRosenwasser]

Thanks!