feat: make lib browser compatible

Author: d3lm

lib/options.ts

@@ -1,4 +1,5 @@
 import { Omit } from "ast-types/types";
+import { getLineTerminator } from "./util";
 
 /**
  * All Recast API functions take second parameter with configuration options,
@@ -169,7 +170,7 @@ const defaults: Options = {
   tabWidth: 4,
   useTabs: false,
   reuseWhitespace: true,
-  lineTerminator: require("os").EOL || "\n",
+  lineTerminator: getLineTerminator(),
   wrapColumn: 74, // Aspirational for now.
   sourceFileName: null,
   sourceMapName: null,

lib/util.ts

@@ -6,6 +6,16 @@ const SourceMapConsumer = sourceMap.SourceMapConsumer;
 const SourceMapGenerator = sourceMap.SourceMapGenerator;
 const hasOwn = Object.prototype.hasOwnProperty;
 
+export function getLineTerminator() {
+  return isBrowser() ? "\n" : require("os").EOL || "\n";
+}
+
+export function isBrowser() {
+  return (
+    typeof window !== "undefined" && typeof window.document !== "undefined"
+  );
+}
+
 export function getOption(options: any, key: any, defaultValue: any) {
   if (options && hasOwn.call(options, key)) {
     return options[key];