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doc: restrict the ES.Next features usage in tests #11452

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doc: restrict the ES.Next features usage in tests #11452

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8 changes: 6 additions & 2 deletions doc/guides/writing-tests.md
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Expand Up @@ -231,8 +231,12 @@ assert.throws(

For performance considerations, we only use a selected subset of ES.Next
features in JavaScript code in the `lib` directory. However, when writing
tests, it is encouraged to use ES.Next features that have already landed
in the ECMAScript specification. For example:
tests, for the ease of backporting, it is encouraged to use those ES.Next
features that can be used directly without a flag in [all maintained branches]
(https://github.com/nodejs/lts), you can check [node.green](http://node.green)
for all available features in each release.

For example:

* `let` and `const` over `var`
* Template literals over string concatenation
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