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doc: clarify require behavior with non .js extensions #41345

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9 changes: 6 additions & 3 deletions doc/api/modules.md
Expand Up @@ -377,9 +377,11 @@ If the exact filename is not found, then Node.js will attempt to load the
required filename with the added extensions: `.js`, `.json`, and finally
`.node`.

`.js` files are interpreted as JavaScript text files, and `.json` files are
parsed as JSON text files. `.node` files are interpreted as compiled addon
modules loaded with `process.dlopen()`.
`.json` files are parsed as JSON text files, `.node` files are interpreted as
compiled addon modules loaded with `process.dlopen()`. Files using any other
extension (or no extension at all) are parsed as JavaScript text files. Refer to
the [Determining module system][] section to understand what parse goal will be
used.

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A required module prefixed with `'/'` is an absolute path to the file. For
example, `require('/home/marco/foo.js')` will load the file at
Expand Down Expand Up @@ -1036,6 +1038,7 @@ This section was moved to
* <a id="modules_sourcemap_payload" href="module.html#sourcemappayload">`sourceMap.payload`</a>
* <a id="modules_sourcemap_findentry_linenumber_columnnumber" href="module.html#sourcemapfindentrylinenumber-columnnumber">`sourceMap.findEntry(lineNumber, columnNumber)`</a>

[Determining module system]: packages.md#determining-module-system
[ECMAScript Modules]: esm.md
[GLOBAL_FOLDERS]: #loading-from-the-global-folders
[`"main"`]: packages.md#main
Expand Down