Remove require("os") from helpers to reduce dependencies for browser scenarios.

demo/markdownlint-browser.js

@@ -25,12 +25,11 @@ module.exports = webpackEmptyContext;
 /*!*****************************!*\
   !*** ../helpers/helpers.js ***!
   \*****************************/
-/***/ ((module, __unused_webpack_exports, __webpack_require__) => {
+/***/ ((module) => {
 
 "use strict";
 // @ts-check
 
-var os = __webpack_require__(/*! os */ "?591e");
 // Regular expression for matching common newline characters
 // See NEWLINES_RE in markdown-it/lib/rules_core/normalize.js
 var newLineRe = /\r\n?|\n/g;
@@ -655,9 +654,10 @@ module.exports.emphasisMarkersInContent = emphasisMarkersInContent;
  * Gets the most common line ending, falling back to the platform default.
  *
  * @param {string} input Markdown content to analyze.
+ * @param {string} [platform] Platform identifier (process.platform).
  * @returns {string} Preferred line ending.
  */
-function getPreferredLineEnding(input) {
+function getPreferredLineEnding(input, platform) {
     var cr = 0;
     var lf = 0;
     var crlf = 0;
@@ -678,7 +678,8 @@ function getPreferredLineEnding(input) {
     });
     var preferredLineEnding = null;
     if (!cr && !lf && !crlf) {
-        preferredLineEnding = os.EOL;
+        preferredLineEnding =
+            ((platform || process.platform) === "win32") ? "\r\n" : "\n";
     }
     else if ((lf >= crlf) && (lf >= cr)) {
         preferredLineEnding = "\n";
@@ -4343,16 +4344,6 @@ module.exports = markdownit;
 
 /***/ }),
 
-/***/ "?591e":
-/*!********************!*\
-  !*** os (ignored) ***!
-  \********************/
-/***/ (() => {
-
-/* (ignored) */
-
-/***/ }),
-
 /***/ "?ec0a":
 /*!********************!*\
   !*** fs (ignored) ***!

demo/webpack.config.js

@@ -44,7 +44,6 @@ function config(options) {
     "resolve": {
       "fallback": {
         "fs": false,
-        "os": false,
         "path": false,
         "util": false
       }

helpers/helpers.js

@@ -2,8 +2,6 @@
 
 "use strict";
 
-const os = require("os");
-
 // Regular expression for matching common newline characters
 // See NEWLINES_RE in markdown-it/lib/rules_core/normalize.js
 const newLineRe = /\r\n?|\n/g;
@@ -680,9 +678,10 @@ module.exports.emphasisMarkersInContent = emphasisMarkersInContent;
  * Gets the most common line ending, falling back to the platform default.
  *
  * @param {string} input Markdown content to analyze.
+ * @param {string} [platform] Platform identifier (process.platform).
  * @returns {string} Preferred line ending.
  */
-function getPreferredLineEnding(input) {
+function getPreferredLineEnding(input, platform) {
   let cr = 0;
   let lf = 0;
   let crlf = 0;
@@ -703,7 +702,8 @@ function getPreferredLineEnding(input) {
   });
   let preferredLineEnding = null;
   if (!cr && !lf && !crlf) {
-    preferredLineEnding = os.EOL;
+    preferredLineEnding =
+      ((platform || process.platform) === "win32") ? "\r\n" : "\n";
   } else if ((lf >= crlf) && (lf >= cr)) {
     preferredLineEnding = "\n";
   } else if (crlf >= cr) {

test/markdownlint-test-helpers.js

@@ -387,7 +387,7 @@ test("forEachInlineCodeSpan", (t) => {
 });
 
 test("getPreferredLineEnding", (t) => {
-  t.plan(17);
+  t.plan(19);
   const testCases = [
     [ "", os.EOL ],
     [ "\r", "\r" ],
@@ -412,6 +412,16 @@ test("getPreferredLineEnding", (t) => {
     const actual = helpers.getPreferredLineEnding(input);
     t.is(actual, expected, "Incorrect line ending returned.");
   });
+  t.is(
+    helpers.getPreferredLineEnding("", "linux"),
+    "\n",
+    "Incorrect line ending for linux"
+  );
+  t.is(
+    helpers.getPreferredLineEnding("", "win32"),
+    "\r\n",
+    "Incorrect line ending for win32"
+  );
 });
 
 test("applyFix", (t) => {