Debug Failure caused by Invalid syntax(null)

[Roise-yue]

🔎 Search Terms

Debug Failure, null,syntax

🕗 Version & Regression Information

• This is a crash happens in version 5.5.3

⏯ Playground Link

No response

💻 Code

This program was obtained by mutating a seed program.

export const box: string
null subTitle: 
export const title: string

🙁 Actual behavior

/usr/lib/node_modules/typescript/lib/tsc.js:120127
      throw e;
      ^

Error: Debug Failure.
    at visitLabeledStatement (/usr/lib/node_modules/typescript/lib/tsc.js:107374:13)
    at topLevelNestedVisitor (/usr/lib/node_modules/typescript/lib/tsc.js:107140:16)
    at topLevelVisitor (/usr/lib/node_modules/typescript/lib/tsc.js:107114:16)
    at visitArrayWorker (/usr/lib/node_modules/typescript/lib/tsc.js:87678:49)
    at visitNodes2 (/usr/lib/node_modules/typescript/lib/tsc.js:87649:19)
    at transformCommonJSModule (/usr/lib/node_modules/typescript/lib/tsc.js:106739:26)
    at transformSourceFile (/usr/lib/node_modules/typescript/lib/tsc.js:106697:21)
    at transformSourceFileOrBundle (/usr/lib/node_modules/typescript/lib/tsc.js:89291:49)
    at transformation (/usr/lib/node_modules/typescript/lib/tsc.js:112511:14)
    at transformRoot (/usr/lib/node_modules/typescript/lib/tsc.js:112534:71)

Node.js v20.14.0

🙂 Expected behavior

TSC report syntax error.Debugging failure should be caused by the second line of the code. Removing the second line can correctly report syntax errors

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"
  ]
}

[Roise-yue]

@Andarist
(the same as #59373)
You mentioned that this bug has been fixed, and I noticed that the version of typescript has been updated. However, when I updated to 5.5.4 and re executed the program, tsc still reported the same error, as did version 5.5.3. Can you rerun this program to help me distinguish whether there was a problem with the installation of my typescript or if this bug has not been completely fixed?

[jakebailey]

This was fixed on main, which is currently targeting 5.6. We typically do not backport fixes to the previous version unless they are explicitly a regression (and are pretty bad).