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Module provides API to access, set and unset environment variables via exported
`env` object.
var { env } = require('api-utils/environment');
You can get the value of an environment variable, by accessing property that
has name of desired variable:
var PATH = env.PATH;
You can check existence of an environment variable by checking if property with
such variable name exists:
console.log('PATH' in env); // true
console.log('FOO' in env); // false
You can set value of an environment variable by setting a property:
env.FOO = 'foo';
env.PATH += ':/my/path/'
You can unset environment variable by deleting a property:
delete env.FOO;
## Limitations ##
There is no way to enumerate existing environment variables, also `env`
won't have any enumerable properties:
console.log(Object.keys(env)); // []
Environment variable will be unset, show up as non-existing if it's set
to `null`, `undefined` or `''`.
env.FOO = null;
console.log('FOO' in env); // false
env.BAR = '';
console.log(env.BAR); // undefined
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