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doc: document that require.main may be undefined

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PR-URL: https://github.com/nodejs/node/pull/41384
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Adrian Estrada <edsadr@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Anto Aravinth <anto.aravinth.cse@gmail.com>
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Antoine du Hamel 2022-01-05 11:05:25 +01:00 committed by GitHub
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doc/api/modules.md
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@ -74,9 +74,8 @@ run directly by testing `require.main === module`.
For a file `foo.js`, this will be `true` if run via `node foo.js`, but For a file `foo.js`, this will be `true` if run via `node foo.js`, but
`false` if run by `require('./foo')`. `false` if run by `require('./foo')`.
Because `module` provides a `filename` property (normally equivalent to When the entry point is not a CommonJS module, `require.main` is `undefined`,
`__filename`), the entry point of the current application can be obtained and the main module is out of reach.
by checking `require.main.filename`.
## Package manager tips ## Package manager tips
@ -718,10 +717,11 @@ extensions gets slower with each registered extension.
added: v0.1.17 added: v0.1.17
--> -->
* {module} * {module | undefined}
The `Module` object representing the entry script loaded when the Node.js The `Module` object representing the entry script loaded when the Node.js
process launched. process launched, or `undefined` if the entry point of the program is not a
CommonJS module.
See ["Accessing the main module"](#accessing-the-main-module). See ["Accessing the main module"](#accessing-the-main-module).
In `entry.js` script: In `entry.js` script: