JS: Implement babel-plugin-root-import as a PathMapping

Author: asgerf

javascript/ql/lib/semmle/javascript/frameworks/Babel.qll

@@ -3,6 +3,7 @@
  */
 
 import javascript
+private import semmle.javascript.internal.paths.PathMapping
 
 module Babel {
   /**
@@ -202,4 +203,12 @@ module Babel {
       )
     }
   }
+
+  private class BabelPathMapping extends PathMapping, RootImportConfig {
+    override File getAnAffectedFile() { result = this.getConfig().getAContainerInScope() }
+
+    override predicate hasPrefixPathMapping(string pattern, Container newContext, string newPath) {
+      newPath = this.getRoot(pattern) and newContext = this.getFolder()
+    }
+  }
 }

javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst1/index.js

@@ -1 +1 @@
-import f from '~/a'; // $ MISSING: importTarget=BabelRootImport/tst1/a.js
+import f from '~/a'; // $ importTarget=BabelRootImport/tst1/a.js

javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst1/nested/tst.js

@@ -1 +1 @@
-import f from '~/a'; // $ MISSING: importTarget=BabelRootImport/tst1/a.js
+import f from '~/a'; // $ importTarget=BabelRootImport/tst1/a.js

javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst2/index.js

@@ -1,2 +1,2 @@
-import g from '~/b.js'; // $ MISSING: importTarget=BabelRootImport/tst2/src/js/b.js
-import f from '#/a'; // $ MISSING: importTarget=BabelRootImport/tst1/a.js
+import g from '~/b.js'; // $ importTarget=BabelRootImport/tst2/src/js/b.js
+import f from '#/a'; // $ importTarget=BabelRootImport/tst1/a.js

javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst3/index.js

@@ -1 +1 @@
-import greeting from '~/b.js'; // $ MISSING: importTarget=BabelRootImport/tst3/src/b.js
+import greeting from '~/b.js'; // $ importTarget=BabelRootImport/tst3/src/b.js

javascript/ql/test/library-tests/PathResolution/BabelRootImport/tst4/index.js

@@ -1,2 +1,2 @@
-import g from '~/b.js'; // $ MISSING: importTarget=BabelRootImport/tst4/src/js/b.js
-import f from '#/a'; // $ MISSING: importTarget=BabelRootImport/tst1/a.js
+import g from '~/b.js'; // $ importTarget=BabelRootImport/tst4/src/js/b.js
+import f from '#/a'; // $ importTarget=BabelRootImport/tst1/a.js

javascript/ql/test/library-tests/PathResolution/test.expected

@@ -1,3 +1,10 @@
+| BabelRootImport/tst1/index.js:1:1:1:20 | import f from '~/a'; | BabelRootImport/tst1/a.js |
+| BabelRootImport/tst1/nested/tst.js:1:1:1:20 | import f from '~/a'; | BabelRootImport/tst1/a.js |
+| BabelRootImport/tst2/index.js:1:1:1:23 | import  ... /b.js'; | BabelRootImport/tst2/src/js/b.js |
+| BabelRootImport/tst2/index.js:2:1:2:20 | import f from '#/a'; | BabelRootImport/tst1/a.js |
+| BabelRootImport/tst3/index.js:1:1:1:30 | import  ... /b.js'; | BabelRootImport/tst3/src/b.js |
+| BabelRootImport/tst4/index.js:1:1:1:23 | import  ... /b.js'; | BabelRootImport/tst4/src/js/b.js |
+| BabelRootImport/tst4/index.js:2:1:2:20 | import f from '#/a'; | BabelRootImport/tst1/a.js |
 | BaseUrl/src/main.ts:2:1:2:26 | import  ... /file"; | BaseUrl/base/lib/file.ts |
 | BaseUrl/src/main.ts:3:1:3:29 | import  ... le.ts"; | BaseUrl/base/lib/file.ts |
 | BaseUrl/src/main.ts:4:1:4:29 | import  ... le.js"; | BaseUrl/base/lib/file.ts |