René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"SyntaxError stack trace source maps","articleBody":"With https://github.com/nodejs/node/pull/54283#issuecomment-2283390708, when the source codes containing syntax errors (like yet to be supported ECMAScript syntaxes) are used with the flag `--experimental-tranform-types`, there is no time for `--enable-source-maps` to collect source maps and perform stack trace mapping, as it collect source maps information from V8 parse results.\r\n\r\n```ts\r\nconst obj = {\r\n  [Symbol.dispose]() {\r\n    console.log('disposed')\r\n  }\r\n}\r\n\r\nfunction foo() {\r\n  using _ = obj;\r\n}\r\n```\r\n\r\nFor example, if the following snippet is been parsed as JS, the error would be:\r\n\r\n```\r\nfile:///Users/cwu631/Developer/nodejs/node/a.mjs:8\r\n  using _ = obj;\r\n        ^\r\n\r\nSyntaxError: Unexpected identifier '_'\r\n    at compileSourceTextModule (node:internal/modules/esm/utils:337:16)\r\n    at ModuleLoader.moduleStrategy (node:internal/modules/esm/translators:166:18)\r\n    at callTranslator (node:internal/modules/esm/loader:436:14)\r\n    at ModuleLoader.moduleProvider (node:internal/modules/esm/loader:442:30)\r\n    at async ModuleJob._link (node:internal/modules/esm/module_job:106:19)\r\n\r\nNode.js v23.0.0-pre\r\n```\r\n\r\nHowever, if it is parsed as TS:\r\n\r\n```\r\n~/D/n/node (pr-54283)> ./node --experimental-transform-types a.mts\r\n(node:11541) ExperimentalWarning: Type Stripping is an experimental feature and might change at any time\r\n(Use `node --trace-warnings ...` to show where the warning was created)\r\nfile:///Users/cwu631/Developer/nodejs/node/a.mts:7\r\n    using _ = obj\r\n          ^\r\n\r\nSyntaxError: Unexpected identifier '_'\r\n    at compileSourceTextModule (node:internal/modules/esm/utils:337:16)\r\n    at ModuleLoader.moduleStrategy (node:internal/modules/esm/translators:166:18)\r\n    at ModuleLoader.\u003canonymous> (node:internal/modules/esm/translators:540:10)\r\n    at callTranslator (node:internal/modules/esm/loader:436:14)\r\n    at ModuleLoader.moduleProvider (node:internal/modules/esm/loader:442:30)\r\n    at async ModuleJob._link (node:internal/modules/esm/module_job:106:19)\r\n\r\nNode.js v23.0.0-pre\r\n```\r\n\r\nNote that the reported syntax error line number is 7, not 8 as expected.","author":{"url":"https://github.com/legendecas","@type":"Person","name":"legendecas"},"datePublished":"2024-08-12T08:56:35Z","url":"https://github.com/nodejs/typescript/issues/4"}