fixup

Author: asgerf

javascript/ql/lib/semmle/javascript/Paths.qll

@@ -135,6 +135,21 @@ class StringAsPath extends string {
   bindingset[this]
   string getExtension() { result = this.regexpCapture(pathRegex(), 4) }
 
+  /**
+   * Holds if this path is relative, in the sense that it should be resolved relative to its enclosing folder.
+   */
+  bindingset[this]
+  pragma[inline_late]
+  predicate isRelativePath() { this.regexpMatch("\\.\\.?(?:[/\\\\].*)?") }
+
+  /**
+   * Gets the NPM package name from the beginning of the given import path, e.g.
+   * gets `foo` from `foo/bar`, and `@example/foo` from `@example/foo/bar`.
+   */
+  bindingset[this]
+  string getPackagePrefix() {
+    result = this.regexpFind("^(@[^/\\\\]+[/\\\\])?[^@./\\\\][^/\\\\]*", _, _)
+  }
 }
 
 /**