Use locale-independent camel-case transformation (#84)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

Author: jhnns

fixtures/child-process-for-test.js

@@ -0,0 +1,6 @@
+'use strict';
+const camelcaseKeys = require('..');
+
+const camelcaseKeysArgs = JSON.parse(process.argv[2]);
+
+console.log(JSON.stringify(camelcaseKeys(...camelcaseKeysArgs)));

index.js

@@ -52,7 +52,7 @@ const camelCaseConvert = (input, options) => {
 			if (cache.has(cacheKey)) {
 				key = cache.get(cacheKey);
 			} else {
-				const returnValue = camelCase(key, {pascalCase});
+				const returnValue = camelCase(key, {pascalCase, locale: false});
 
 				if (key.length < 100) { // Prevent abuse
 					cache.set(cacheKey, returnValue);

package.json

@@ -50,7 +50,7 @@
 		"recursive"
 	],
 	"dependencies": {
-		"camelcase": "^6.2.0",
+		"camelcase": "^6.3.0",
 		"map-obj": "^4.1.0",
 		"quick-lru": "^5.1.1",
 		"type-fest": "^1.2.1"

test.js

@@ -1,6 +1,10 @@
+import {promisify} from 'util';
+import {execFile} from 'child_process';
 import test from 'ava';
 import camelcaseKeys from '.';
 
+const execFilePromise = promisify(execFile);
+
 test('main', t => {
 	t.true(camelcaseKeys({'foo-bar': true}).fooBar);
 });
@@ -106,3 +110,38 @@ test('handle array of non-objects with `deep` option', t => {
 		input
 	);
 });
+
+test('use locale independent camel-case transformation', async t => {
+	const input = {'user-id': 123};
+	t.deepEqual(
+		// Execute the library with Turkish locale.
+		// A locale dependent implementation would return `{userİd: 123}`.
+		// See https://github.com/sindresorhus/camelcase-keys/issues/81
+		await runInTestProcess([input], {env: {...process.env, LC_ALL: 'tr'}}),
+		{userId: 123}
+	);
+});
+
+/**
+Executes the library with the given arguments and resolves with the parsed result.
+
+Input and output is serialized via `JSON.stringify()` and `JSON.parse()`.
+*/
+const runInTestProcess = async (camelcaseKeysArgs, childProcessOptions = {}) => {
+	const {stdout, stderr} = await execFilePromise(
+		process.execPath,
+		['./fixtures/child-process-for-test.js', JSON.stringify(camelcaseKeysArgs)],
+		childProcessOptions
+	);
+
+	if (stderr) {
+		throw new Error(stderr);
+	}
+
+	try {
+		return JSON.parse(stdout);
+	} catch (error) {
+		error.message = `Error parsing "${stdout}" as JSON: ${error.message}`;
+		throw error;
+	}
+};