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backend/node_modules/decamelize/index.js

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+'use strict';
+
+const handlePreserveConsecutiveUppercase = (decamelized, separator) => {
+	// Lowercase all single uppercase characters. As we
+	// want to preserve uppercase sequences, we cannot
+	// simply lowercase the separated string at the end.
+	// `data_For_USACounties` → `data_for_USACounties`
+	decamelized = decamelized.replace(
+		/((?<![\p{Uppercase_Letter}\d])[\p{Uppercase_Letter}\d](?![\p{Uppercase_Letter}\d]))/gu,
+		$0 => {
+			return $0.toLowerCase();
+		}
+	);
+
+	// Remaining uppercase sequences will be separated from lowercase sequences.
+	// `data_For_USACounties` → `data_for_USA_counties`
+	return decamelized.replace(
+		/(\p{Uppercase_Letter}+)(\p{Uppercase_Letter}\p{Lowercase_Letter}+)/gu,
+		(_, $1, $2) => {
+			return $1 + separator + $2.toLowerCase();
+		}
+	);
+};
+
+module.exports = (
+	text,
+	{
+		separator = '_',
+		preserveConsecutiveUppercase = false
+	} = {}
+) => {
+	if (!(typeof text === 'string' && typeof separator === 'string')) {
+		throw new TypeError(
+			'The `text` and `separator` arguments should be of type `string`'
+		);
+	}
+
+	// Checking the second character is done later on. Therefore process shorter strings here.
+	if (text.length < 2) {
+		return preserveConsecutiveUppercase ? text : text.toLowerCase();
+	}
+
+	const replacement = `$1${separator}$2`;
+
+	// Split lowercase sequences followed by uppercase character.
+	// `dataForUSACounties` → `data_For_USACounties`
+	// `myURLstring → `my_URLstring`
+	const decamelized = text.replace(
+		/([\p{Lowercase_Letter}\d])(\p{Uppercase_Letter})/gu,
+		replacement
+	);
+
+	if (preserveConsecutiveUppercase) {
+		return handlePreserveConsecutiveUppercase(decamelized, separator);
+	}
+
+	// Split multiple uppercase characters followed by one or more lowercase characters.
+	// `my_URLstring` → `my_url_string`
+	return decamelized
+		.replace(
+			/(\p{Uppercase_Letter})(\p{Uppercase_Letter}\p{Lowercase_Letter}+)/gu,
+			replacement
+		)
+		.toLowerCase();
+};