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The `getenv()` function returns the value of the given environment variable
or `null` if either the given variable does not exist or if the given name
argument is not a string.
-- Testcase --
{%
printf("%.J\n", [
getenv("TEST_VARIABLE"),
getenv("EMPTY_VARIABLE"),
getenv("THIS_LIKELY_DOES_NOT_EXIST"),
getenv(123),
getenv(null)
]);
%}
-- End --
-- Vars --
TEST_VARIABLE=Test Value
EMPTY_VARIABLE=
-- End --
-- Expect stdout --
[
"Test Value",
"",
null,
null,
null
]
-- End --
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