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doc: restrict the ES.Next features usage in tests

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PR-URL: https://github.com/nodejs/node/pull/11452
Refs: https://github.com/nodejs/node/pull/11290
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
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DavidCai 2017-02-19 16:34:57 +08:00 committed by Joyee Cheung
parent 84ee957800
commit 88035bc60d
1 changed files with 6 additions and 2 deletions
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8
doc/guides/writing-tests.md
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@ -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