doc: mention case-insensitive env on windows
On Windows OS, environment variables are case-insensitive and are treated likewise in NodeJS. This can be confusing and can lead to hard-to-debug problems when moving code from one environment to another. Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> PR-URL: https://github.com/nodejs/node/pull/9166 Fixes: https://github.com/nodejs/node/issues/9157
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@ -708,6 +708,16 @@ console.log(process.env.TEST);
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// => undefined
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// => undefined
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```
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```
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On Windows operating systems, environment variables are case-insensitive.
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Example:
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```js
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process.env.TEST = 1;
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console.log(process.env.test);
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// => 1
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```
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## process.emitWarning(warning[, name][, ctor])
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## process.emitWarning(warning[, name][, ctor])
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<!-- YAML
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<!-- YAML
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added: v6.0.0
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added: v6.0.0
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