JavaScript: Classify files with names ending in _min as minified.

We already do the same for `-min` and `.min`. [Here](https://github.com/antoniogarrote/rdfstore-js/blob/master/dist/rdfstore_min.js) is a real-world example.

Author: Max Schaefer

change-notes/1.23/analysis-javascript.md

@@ -2,6 +2,8 @@
 
 ## General improvements
 
+* Automatic classification of generated and minified files has been improved, in particular files generated by Doxygen are now recognized.
+
 * Support for `globalThis` has been added.
 
 * Support for the following frameworks and libraries has been improved:
@@ -14,8 +16,6 @@
 
 * TypeScript 3.6 and 3.7 features are now supported.
 
-* Automatic classification of generated files has been improved, in particular files generated by Doxygen are now recognized.
-
 ## New queries
 
 | **Query**                                                                 | **Tags**                                                          | **Purpose**                                                                                                                                                                            |

javascript/ql/src/semmle/javascript/AST.qll

@@ -150,7 +150,7 @@ class TopLevel extends @toplevel, StmtContainer {
   /** Holds if this toplevel is minified. */
   predicate isMinified() {
     // file name contains 'min' (not as part of a longer word)
-    getFile().getBaseName().regexpMatch(".*[^-.]*[-.]min([-.].*)?\\.\\w+")
+    getFile().getBaseName().regexpMatch(".*[^-._]*[-._]min([-._].*)?\\.\\w+")
     or
     exists(int numstmt | numstmt = strictcount(Stmt s | s.getTopLevel() = this) |
       // there are more than two statements per line on average

javascript/ql/test/query-tests/filters/ClassifyFiles/ClassifyFiles.expected

@@ -39,8 +39,11 @@
 | textmate.html:0:0:0:0 | textmate.html | generated |
 | tmpl2.html:0:0:0:0 | tmpl2.html | template |
 | tmpl.html:0:0:0:0 | tmpl.html | template |
+| tst-min.js:0:0:0:0 | tst-min.js | generated |
 | tst.browserify.js:0:0:0:0 | tst.browserify.js | generated |
 | tst.dart.js:0:0:0:0 | tst.dart.js | generated |
+| tst.min.js:0:0:0:0 | tst.min.js | generated |
+| tst_min.js:0:0:0:0 | tst_min.js | generated |
 | twitter-text.js:0:0:0:0 | twitter-text.js | library |
 | twitter_text.js:0:0:0:0 | twitter_text.js | library |
 | unannotated-externs-1.js:0:0:0:0 | unannotated-externs-1.js | externs |