benchmark: add dotenv benchmark

PR-URL: https://github.com/nodejs/node/pull/54278
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>

benchmark/fixtures/valid.env

@@ -0,0 +1,67 @@
+BASIC=basic
+
+# COMMENTS=work
+#BASIC=basic2
+#BASIC=basic3
+
+# previous line intentionally left blank
+AFTER_LINE=after_line
+EMPTY=
+EMPTY_SINGLE_QUOTES=''
+EMPTY_DOUBLE_QUOTES=""
+EMPTY_BACKTICKS=``
+SINGLE_QUOTES='single_quotes'
+SINGLE_QUOTES_SPACED='    single quotes    '
+DOUBLE_QUOTES="double_quotes"
+DOUBLE_QUOTES_SPACED="    double quotes    "
+DOUBLE_QUOTES_INSIDE_SINGLE='double "quotes" work inside single quotes'
+DOUBLE_QUOTES_WITH_NO_SPACE_BRACKET="{ port: $MONGOLAB_PORT}"
+SINGLE_QUOTES_INSIDE_DOUBLE="single 'quotes' work inside double quotes"
+BACKTICKS_INSIDE_SINGLE='`backticks` work inside single quotes'
+BACKTICKS_INSIDE_DOUBLE="`backticks` work inside double quotes"
+BACKTICKS=`backticks`
+BACKTICKS_SPACED=`    backticks    `
+DOUBLE_QUOTES_INSIDE_BACKTICKS=`double "quotes" work inside backticks`
+SINGLE_QUOTES_INSIDE_BACKTICKS=`single 'quotes' work inside backticks`
+DOUBLE_AND_SINGLE_QUOTES_INSIDE_BACKTICKS=`double "quotes" and single 'quotes' work inside backticks`
+EXPAND_NEWLINES="expand\nnew\nlines"
+DONT_EXPAND_UNQUOTED=dontexpand\nnewlines
+DONT_EXPAND_SQUOTED='dontexpand\nnewlines'
+# COMMENTS=work
+INLINE_COMMENTS=inline comments # work #very #well
+INLINE_COMMENTS_SINGLE_QUOTES='inline comments outside of #singlequotes' # work
+INLINE_COMMENTS_DOUBLE_QUOTES="inline comments outside of #doublequotes" # work
+INLINE_COMMENTS_BACKTICKS=`inline comments outside of #backticks` # work
+INLINE_COMMENTS_SPACE=inline comments start with a#number sign. no space required.
+EQUAL_SIGNS=equals==
+RETAIN_INNER_QUOTES={"foo": "bar"}
+RETAIN_INNER_QUOTES_AS_STRING='{"foo": "bar"}'
+RETAIN_INNER_QUOTES_AS_BACKTICKS=`{"foo": "bar's"}`
+TRIM_SPACE_FROM_UNQUOTED=    some spaced out string
+SPACE_BEFORE_DOUBLE_QUOTES=   "space before double quotes"
+EMAIL=therealnerdybeast@example.tld
+    SPACED_KEY = parsed
+EDGE_CASE_INLINE_COMMENTS="VALUE1" # or "VALUE2" or "VALUE3"
+
+MULTI_DOUBLE_QUOTED="THIS
+IS
+A
+MULTILINE
+STRING"
+
+MULTI_SINGLE_QUOTED='THIS
+IS
+A
+MULTILINE
+STRING'
+
+MULTI_BACKTICKED=`THIS
+IS
+A
+"MULTILINE'S"
+STRING`
+export EXPORT_EXAMPLE = ignore export
+
+MULTI_NOT_VALID_QUOTE="
+MULTI_NOT_VALID=THIS
+IS NOT MULTILINE

benchmark/util/parse-env.js

@@ -0,0 +1,23 @@
+'use strict';
+
+const { createBenchmark } = require('../common.js');
+const path = require('node:path');
+const fs = require('node:fs');
+const util = require('node:util');
+const assert = require('node:assert');
+
+const bench = createBenchmark(main, {
+  n: 3e4,
+});
+
+const env = fs.readFileSync(path.resolve(__dirname, '../fixtures/valid.env'), 'utf-8');
+
+function main({ n }) {
+  let noDead;
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    noDead = util.parseEnv(env);
+  }
+  bench.end(n);
+  assert(noDead !== undefined);
+}