Incorrect Error Message: "Cannot assign to 'name' because it is a constant" Instead of "Identifier 'name' is not defined" for Undefined Identifier Assignment

[Roise-yue]

🔎 Search Terms

TS2304 TS2588 constant

🕗 Version & Regression Information

• This changed between versions 5.4.5 and 5.5.3_____

⏯ Playground Link

No response

💻 Code

// function A():void{
//     let yso: string = "bob";
//     name = "smith";
// }

let yso: string = "bob";
name = "smith";

🙁 Actual behavior

error massage:

TS2588
Cannot assign to 'name' because it is a constant.
'name' is deprecated.

🙂 Expected behavior

error massage:

can not find 'name'  / 'name' is not defined

Additional information about the issue

tsconfig.json

{
  "compilerOptions": {
    "target": "ESNext",
    "module": "CommonJS",
    "moduleResolution": "Node",
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    "lib": ["es2023","dom"]
  },
  "include": [
    "TScorpus/*"
  ],
  "exclude": [
    "node_modules"
  ]
}

[MartinJohns]

• This changed between versions 5.4.5 and 5.5.3_____

I don't see any difference in behaviour between these versions.

This is, unfortunately, working as intended. In the browser context you have a global name variable. See also #18433.

[Roise-yue]

Thank you for your response to this question. I didn't quite understand why name is a constant before, but now I have a better understanding of this issue.

[typescript-bot]

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