Wrong error diagnostics message 'Cannot find module xxxx'

[mmorhun]

TypeScript Version: 3.4.0-dev.20190315

Search Terms:

Cannot find module, wrong message

Steps to reproduce

1. Create a new workspace (empty folder). Create subfolder test-plugin in it.

2. Install npm install -g yo @theia/generator-plugin

3. Generate a frontend plug-in: yo @theia/plugin. So, the folders structure should be as following:

ws-root
 |- test-plugin
    |- dist
    |- src
    |  |- test-plugin-frontend.ts
    |- node_modules   
    |  |- ...
    |- package.json
    |- tsconfig.json
    |- ...

4. Open test-plugin-frontend.ts and paste the following content:

import * as theia from '@theia/plugin';

export function start(context: theia.PluginContext) {
    theia.window.onDidChangeVisibleTextEditors((editors: theia.TextEditor[]) => {
        let list: string = '';
        for (let editor of editors) {
            list += editor.document.uri.toString() + ', ';
        }
        console.log(list);
    });
  
   // theia.window.onDid
}

export function stop() { }

5. Build the project using yarn command

6. Uncomment the commented line. Change a few symbols and comment it again (Use Ctrl + /shortcut). Save the editor content.

Expected behavior:

No error diagnostic message, nothing has changed actually.

Actual behavior:

Error diagnostic message is appeared on the @theia/plugin import: [typescript] Cannot find module '@theia/plugin'

[RyanCavanaugh]

Barring a more specific repro that doesn't involve a bunch of external command, this looks like a configuration error or a problem in another tool. Some way to produce this problem using just normal file operations would allow us to move forward.

[mmorhun]

I've created repository with source code for the problem.

Steps to reproduce

1. Clone repository https://github.com/mmorhun/ts-30422
2. Build it with yarn command
3. Edit the commented line in src/test-plugin-frontend.ts

Screencast: