Improved source map file name normalizer logic

Fixed https://github.com/javascript-obfuscator/javascript-obfuscator/issues/406

src/cli/utils/CLIUtils.ts

@@ -4,6 +4,8 @@ import * as path from 'path';
 
 import { TObject } from '../../types/TObject';
 
+import { StringSeparator } from '../../enums/StringSeparator';
+
 import { JavaScriptObfuscatorCLI } from '../JavaScriptObfuscatorCLI';
 
 export class CLIUtils {
@@ -14,11 +16,11 @@ export class CLIUtils {
     public static getOutputCodePath (inputPath: string): string {
         return path
             .normalize(inputPath)
-            .split('.')
+            .split(StringSeparator.Dot)
             .map((value: string, index: number) => {
                 return index === 0 ? `${value}${JavaScriptObfuscatorCLI.obfuscatedFilePrefix}` : value;
             })
-            .join('.');
+            .join(StringSeparator.Dot);
     }
 
     /**
@@ -34,7 +36,7 @@ export class CLIUtils {
         }
 
         if (!/\.js\.map$/.test(outputCodePath)) {
-            outputCodePath = `${outputCodePath.split('.')[0]}.js.map`;
+            outputCodePath = `${outputCodePath.split(StringSeparator.Dot)[0]}.js.map`;
         } else if (/\.js$/.test(outputCodePath)) {
             outputCodePath += '.map';
         }

src/enums/StringSeparator.ts

@@ -0,0 +1,3 @@
+export enum StringSeparator {
+    Dot = '.'
+}

src/options/normalizer-rules/InputFileNameRule.ts

@@ -2,6 +2,8 @@ import { TOptionsNormalizerRule } from '../../types/options/TOptionsNormalizerRu
 
 import { IOptions } from '../../interfaces/options/IOptions';
 
+import { StringSeparator } from '../../enums/StringSeparator';
+
 /**
  * @param {IOptions} options
  * @returns {IOptions}
@@ -12,9 +14,9 @@ export const InputFileNameRule: TOptionsNormalizerRule = (options: IOptions): IO
     if (inputFileName) {
         inputFileName = inputFileName
             .replace(/^\/+/, '')
-            .split('.')
+            .split(StringSeparator.Dot)
             .slice(0, -1)
-            .join('.') || inputFileName;
+            .join(StringSeparator.Dot) || inputFileName;
 
         options = {
             ...options,

src/options/normalizer-rules/SourceMapFileNameRule.ts

@@ -2,6 +2,8 @@ import { TOptionsNormalizerRule } from '../../types/options/TOptionsNormalizerRu
 
 import { IOptions } from '../../interfaces/options/IOptions';
 
+import { StringSeparator } from '../../enums/StringSeparator';
+
 /**
  * @param {IOptions} options
  * @returns {IOptions}
@@ -12,7 +14,18 @@ export const SourceMapFileNameRule: TOptionsNormalizerRule = (options: IOptions)
     if (sourceMapFileName) {
         sourceMapFileName = sourceMapFileName
             .replace(/^\/+/, '')
-            .split('.')[0];
+            .replace(/(?:\.js)?(?:\.map)?$/, '');
+
+        let sourceMapFileNameParts: string[] = sourceMapFileName.split(StringSeparator.Dot);
+        const sourceMapFileNamePartsCount: number = sourceMapFileNameParts.length;
+        const lastPart: string = sourceMapFileNameParts[sourceMapFileNamePartsCount - 1];
+
+        // try to predict if last part is extension or not
+        if (sourceMapFileNamePartsCount > 1 && lastPart.length <= 3) {
+            sourceMapFileNameParts = sourceMapFileNameParts.slice(0, -1);
+        }
+
+        sourceMapFileName = sourceMapFileNameParts.join(StringSeparator.Dot);
 
         options = {
             ...options,