TSServer "Could not find a declaration file for module" message shown when requiring JS modules from JS

[mattlyons0]

TypeScript Version: 3.7.0-dev.20191013

Search Terms: Could not find a declaration file for module, Javascript imports, Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type, Node, RequireJS, Node Modules

Code

test2.js:

import Transmission from 'transmission' // A package written in JS with no @types package

const api = new Transmission()

Expected behavior:

I am writing in a Javascript file I do not expect to get any warnings about missing Typescript types on my imported packages. If the source file was test2.ts I would expect this warning.

Actual behavior:

A warning is shown:

Could not find a declaration file for module 'transmission'. '/tmp/test-js/node_modules/transmission/lib/transmission.js' implicitly has an 'any' type.
Try `npm install @types/transmission` if it exists or add a new declaration (.d.ts) file containing `declare module 'transmission';`ts(7016)

VSCode (using TSServer):

This is an interesting interaction between the fact that VSCode (and other editors) use tsserver to generate annotations, autocompletion... Generally when writing Javascript in VSCode you are not nagged to put types anywhere (and don't even have to be aware tsserver is running) except for in this case when you import a package written in Javascript that does not have a @types package.

It seems this behavior was introduced mid last year: 16fc256

Playground Link: N/A because files are implicitly *.ts in the typescript playground.

Related Issues: #24749 atom/ide-typescript#144

[RyanCavanaugh]

I can't reproduce this issue. Regardless, this is a suggestion, not a warning. You're free to ignore suggestions; they're just suggestions. Suggestions are indicated with three dots, as shown in the screenshot; warnings are indicated with yellow or red squiggles.

You can turn off Suggestions in your VS Code settings if you'd like to not see them; set

    "javascript.suggestionActions.enabled": false

in your config

[typescript-bot]

This issue has been marked 'Working as Intended' and has seen no recent activity. It has been automatically closed for house-keeping purposes.