René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"\"Cannot find module\" when main file not `index.js` with experimental-specifier-resolution=node","articleBody":"* **Version**: 13.9.0\r\n* **Platform**: Linux\r\n\r\n### What steps will reproduce the bug?\r\n\r\n1. Clone https://github.com/dandv/node-cant-find-module-with-main-not-index.js\r\n2. `npm start`\r\n\r\n### What is the expected behavior?\r\n\r\nThe script should display `Success!`, and does do so if `mypackage/Lib.js` is renamed to `mypackage/index.js`.\r\n\r\n### What do you see instead?\r\n\r\n```\r\ninternal/modules/esm/resolve.js:61\r\n  let url = moduleWrapResolve(specifier, parentURL);\r\n            ^\r\n\r\nError: Cannot find module /home/dandv/prg/node-cant-find-module-with-main-not-index.js/mypackage imported from /home/dandv/prg/node-cant-find-module-with-main-not-index.js/run.js\r\n    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:61:13)\r\n    at Loader.resolve (internal/modules/esm/loader.js:85:40)\r\n    at Loader.getModuleJob (internal/modules/esm/loader.js:191:28)\r\n    at ModuleWrap.\u003canonymous\u003e (internal/modules/esm/module_job.js:42:40)\r\n    at link (internal/modules/esm/module_job.js:41:36) {\r\n  code: 'ERR_MODULE_NOT_FOUND'\r\n}\r\n```\r\n\r\n### Additional information\r\n\r\nI'm trying to run node with `-experimental-specifier-resolution=node` because [TypeScript can't output .mjs files](https://github.com/microsoft/TypeScript/issues/18442) and I want to use extension-less `import` statements. I prefer to use `Lib.js` instead of `index.js` to distinguish in my IDE between the main files of multiple packages in my monorepo that otherwise would all look like `index.js`.","author":{"url":"https://github.com/dandv","@type":"Person","name":"dandv"},"datePublished":"2020-03-05T10:24:48.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":15},"url":"https://github.com/32103/node/issues/32103"}