inline comments are striped in emitted declaration files

[Hotell]

TypeScript Version: 3.1.3

Search Terms: inline comments striped

tsconfig

{
  "compilerOptions": {
    "moduleResolution": "node",
    "module": "esnext",
    "target": "es5",
    "lib": [
      "dom",
      "es2018"
    ],
    "strict": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "suppressImplicitAnyIndexErrors": true,
    "forceConsistentCasingInFileNames": true,
    "jsx": "react",
    "sourceMap": true,
    "outDir": "dist/esm5",
    "declaration": true,
    "declarationDir": "dist/types",
    "declarationMap": true,
    "stripInternal": true,
    "resolveJsonModule": true,
    "importHelpers": true
  },
  "include": [
    "./src"
  ],
  "compileOnSave": false,
  "buildOnSave": false
}

Code:

// I'll be missing after tsc 😭

/**
 * I'll be here after tsc 😎
 */

export const api = () => { /* some code ... */ } 

Expected behavior:

Keeping both block and inline comments in declaration files in both transpiled files and declaration files

Actual behavior:

Inline comments are removed in declaration files

And correctly kept within transpiled files

[weswigham]

Multiline comments are preserved by declaration emit because they're typically documentation comments for quick info and the like. (We don't interpret single line comments as docs, afaik)

[Hotell]

While that makes sense, it's not consistent :) so what's gonna happen / is there anything I can do on my side ?

[jrom99]

Hello, this is causing a bug when I wrote a UserScript that needs inline comments for its metadata:

It seems that typescript is removing all root inline comments.

System information:

tsc version 5.3.3

// tsconfig.json
{
  "compilerOptions": {
    "target": "ES2022",
    "module": "ES2022",
    "lib": ["es2022", "dom"],
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "removeComments": false,
    "skipLibCheck": true
  }
}