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doc: explain native external types

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There is a reference to native external types in
util.types.isExternal api documentation. Provide
a brief explanation to that.
Refs: https://github.com/nodejs/node/pull/31173#discussion_r362816411

PR-URL: https://github.com/nodejs/node/pull/31214
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
This commit is contained in:
Harshitha KP 2020-01-06 00:52:14 -05:00 committed by Gireesh Punathil
parent ba98d9ab2c
commit 95871a1ed7
1 changed files with 5 additions and 0 deletions
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doc/api/util.md
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@ -1392,6 +1392,11 @@ added: v10.0.0
* Returns: {boolean}
Returns `true` if the value is a native `External` value.
A native `External` value is a special type of object whose
data is not stored within the JavaScript managed heap
and does not conform to standard JavaScript types. Such
objects are created either by Node.js internals or native
addons and are wrapped by a JavaScript object.
### `util.types.isFloat32Array(value)`
<!-- YAML