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Jan 5, 2022
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doc: document that require.main may be undefined #41384

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doc: document that `require.main` may be `undefined`
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10 changes: 5 additions & 5 deletions doc/api/modules.md
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Expand Up @@ -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
`false` if run by `require('./foo')`.

Because `module` provides a `filename` property (normally equivalent to
`__filename`), the entry point of the current application can be obtained
by checking `require.main.filename`.
When the entry point is not a CommonJS module, `require.main` is `undefined`,
and the main module is out of reach.

## Package manager tips

Expand Down Expand Up @@ -718,10 +717,11 @@ extensions gets slower with each registered extension.
added: v0.1.17
-->

* {module}
* {module | undefined}

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).

In `entry.js` script:
Expand Down