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backport: v4.x - #11452 - doc: restrict the ES.Next features usage in tests #11725

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15 changes: 15 additions & 0 deletions doc/guides/writing-tests.md
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Expand Up @@ -189,6 +189,21 @@ const assert = require('assert');
const freelist = require('internal/freelist');
```

### ES.Next features

For performance considerations, we only use a selected subset of ES.Next
features in JavaScript code in the `lib` directory. However, when writing
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
* Arrow functions when appropriate

## Naming Test Files

Test files are named using kebab casing. The first component of the name is
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