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doc: mention case-insensitive env on windows #9166

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10 changes: 10 additions & 0 deletions doc/api/process.md
Original file line number Diff line number Diff line change
Expand Up @@ -708,6 +708,16 @@ console.log(process.env.TEST);
// => undefined
```

On Windows operating systems, environment variables are case-insensitive.

Example:

```js
process.env.TEST = 1;
console.log(process.env.test);
// => 1
```

## process.emitWarning(warning[, name][, ctor])
<!-- YAML
added: v6.0.0
Expand Down
16 changes: 15 additions & 1 deletion test/parallel/test-process-env.js
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
'use strict';

require('../common');
const common = require('../common');
const assert = require('assert');

// changes in environment should be visible to child processes
Expand Down Expand Up @@ -67,3 +67,17 @@ assert.equal(3, date.getUTCHours());
assert.equal(5, date.getHours());
*/
/* eslint-enable max-len */

// Environment variables should be case-insensitive on Windows, and
// case-sensitive on other platforms.
process.env.TEST = 'test';
assert.strictEqual(process.env.TEST, 'test');
// Check both mixed case and lower case, to avoid any regressions that might
// simply convert input to lower case.
if (common.isWindows) {
assert.strictEqual(process.env.test, 'test');
assert.strictEqual(process.env.teST, 'test');
} else {
assert.strictEqual(process.env.test, undefined);
assert.strictEqual(process.env.teST, undefined);
}