René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"SourceTextModule w/ microtaskMode \"afterEvaluate\" breaks program execution flow","articleBody":"### Version\n\nv24.5.0\n\n### Platform\n\n```text\nLinux hostname 6.10.6-arch1-1 #1 SMP PREEMPT_DYNAMIC Mon, 19 Aug 2024 17:02:39 +0000 x86_64 GNU/Linux\n```\n\n### Subsystem\n\nvm\n\n### What steps will reproduce the bug?\n\n```\nimport * as vm from \"node:vm\";\n\nconst context = vm.createContext({}, {\n  microtaskMode: \"afterEvaluate\",\n});\n\nconst m = new vm.SourceTextModule(\n  \"\",\n  {context},\n);\n\nawait m.link(() =\u003e null);\nawait m.evaluate();\n\nconsole.log(\"This is never printed, but the node process terminates.\");\n```\n\n### How often does it reproduce? Is there a required condition?\n\nRepeats every time.\n\n### What is the expected behavior? Why is that the expected behavior?\n\nWith this module source code (the empty string in this example, but it also happens with non-trivial code in the module), the program behavior should be the same whether the microtaskMode is set to \"afterEvaluate\" or left unspecified. The console.log() statement should be printed.\n\n### What do you see instead?\n\nNode terminates without executing the console.log() statement. Node reports:\n\n```\nWarning: Detected unsettled top-level await at file:///tmp/test2.js:13\nawait m.evaluate();\n^\n```\n\nIf you comment out the line setting microtaskMode, the console.log() statement is executed as expected.\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/ericrannaud","@type":"Person","name":"ericrannaud"},"datePublished":"2025-08-19T17:20:41.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/59541/node/issues/59541"}