René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Circular declarations cause infinite loops in getExportInfos since v5.5","articleBody":"### 🔎 Search Terms\n\ninfinite loop, circular, infinite loop, getExportInfos, invalid array length\n\n### 🕗 Version \u0026 Regression Information\n\n- This is an infinite loop in tsserver, eventually leading to a crash due to creating an infinitely sized array.\r\n- This changed between versions 5.5.0-dev.20240508 and 5.5.0-dev.20240509\r\n- Probably this pr: #58460 \r\n\n\n### ⏯ Playground Link\n\nDoes not reproduce on playground\n\n### 💻 Code\n\nIn an empty folder, place this code in `types.d.ts`\r\n```ts\r\ndeclare module \"mymod\" {\r\n  import mymod from \"mymod\";\r\n  export default mymod;\r\n}\r\n```\r\n\r\nIn another file `index.ts`, trigger an autocomplete or getCodeFixes. Typing two characters into an empty file will usually work. It will hang.\r\n\n\n### 🙁 Actual behavior\n\nThe LSP server go into an infinite loop and hangs. After about 20 seconds it'll throw because an array gets too big.\r\n\r\nThe server log contains:\r\n\r\n```\r\n    RangeError: Invalid array length\r\n        at Array.push (\u003canonymous\u003e)\r\n        at append (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:2822:6)\r\n        at forEachNameOfDefaultExport (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:138888:13)\r\n        at /Users/myusername/mweb/node_modules/typescript/lib/typescript.js:155493:115\r\n        at /Users/myusername/mweb/node_modules/typescript/lib/typescript.js:138720:119\r\n        at forEachExternalModule (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:138763:7)\r\n        at forEachExternalModuleToImportFrom (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:138720:3)\r\n        at getExportInfos (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:155488:3)\r\n        at /Users/myusername/mweb/node_modules/typescript/lib/typescript.js:155424:24\r\n        at flatMap (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:2502:17)\r\n        at getFixesInfoForNonUMDImport (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:155418:10)\r\n        at getFixInfos (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:155254:12)\r\n        at Object.getCodeActions (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:154389:18)\r\n        at /Users/myusername/mweb/node_modules/typescript/lib/typescript.js:151448:46\r\n        at flatMap (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:2502:17)\r\n        at Object.getFixes (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:151448:10)\r\n        at /Users/myusername/mweb/node_modules/typescript/lib/typescript.js:149730:33\r\n        at flatMap (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:2502:17)\r\n        at Object.getCodeFixesAtPosition (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:149728:12)\r\n        at IpcIOSession.getCodeFixes (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:191339:50)\r\n        at getCodeFixes (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:189374:43)\r\n        at /Users/myusername/mweb/node_modules/typescript/lib/typescript.js:191661:15\r\n        at IpcIOSession.executeWithRequestId (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:191650:14)\r\n        at IpcIOSession.executeCommand (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:191659:29)\r\n        at IpcIOSession.onMessage (/Users/myusername/mweb/node_modules/typescript/lib/typescript.js:191707:68)\r\n        at process.\u003canonymous\u003e (/Users/myusername/mweb/node_modules/typescript/lib/tsserver.js:525:14)\r\n        at process.emit (node:events:514:28)\r\n        at emit (node:internal/child_process:951:14)\r\n        at process.processTicksAndRejections (node:internal/process/task_queues:83:21)\r\n```\r\n\r\n\u003cimg width=\"1800\" alt=\"Screenshot 2024-07-09 at 10 06 41 PM\" src=\"https://github.com/microsoft/TypeScript/assets/4035267/5f7808ad-860c-46b6-8e55-fe4e68093c12\"\u003e\r\n\n\n### 🙂 Expected behavior\n\nNothing should happen.\n\n### Additional information about the issue\n\n_No response_","author":{"url":"https://github.com/simon-paris","@type":"Person","name":"simon-paris"},"datePublished":"2024-07-09T15:16:37.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/59201/TypeScript/issues/59201"}