TS: Pass virtual source root explicitly to Node.js process

Author: asgerf

javascript/extractor/lib/typescript/src/main.ts

@@ -48,6 +48,7 @@ interface ParseCommand {
 interface OpenProjectCommand {
     command: "open-project";
     tsConfig: string;
+    virtualSourceRoot: string | null;
     packageEntryPoints: [string, string][];
     packageJsonFiles: [string, string][];
 }
@@ -261,7 +262,7 @@ function handleOpenProjectCommand(command: OpenProjectCommand) {
 
     let packageEntryPoints = new Map(command.packageEntryPoints);
     let packageJsonFiles = new Map(command.packageJsonFiles);
-    let virtualSourceRoot = new VirtualSourceRoot(process.cwd(), process.env["CODEQL_EXTRACTOR_JAVASCRIPT_SCRATCH_DIR"]);
+    let virtualSourceRoot = new VirtualSourceRoot(process.cwd(), command.virtualSourceRoot);
 
     /**
      * Rewrites path segments of form `node_modules/PACK/suffix` to be relative to
@@ -582,6 +583,7 @@ if (process.argv.length > 2) {
             tsConfig: argument,
             packageEntryPoints: [],
             packageJsonFiles: [],
+            virtualSourceRoot: null,
         });
         for (let sf of state.project.program.getSourceFiles()) {
             if (pathlib.basename(sf.fileName) === "lib.d.ts") continue;

javascript/extractor/src/com/semmle/js/extractor/AutoBuild.java

@@ -784,7 +784,7 @@ protected DependencyInstallationResult installDependencies(Set<Path> filesToExtr
       }
     }
 
-    return new DependencyInstallationResult(packageMainFile, packagesInRepo);
+    return new DependencyInstallationResult(virtualSourceRoot, packageMainFile, packagesInRepo);
   }
 
   /**

javascript/extractor/src/com/semmle/js/extractor/DependencyInstallationResult.java

@@ -6,19 +6,31 @@
 
 /** Contains the results of installing dependencies. */
 public class DependencyInstallationResult {
+  private Path virtualSourceRoot;
   private Map<String, Path> packageEntryPoints;
   private Map<String, Path> packageJsonFiles;
 
   public static final DependencyInstallationResult empty =
-      new DependencyInstallationResult(Collections.emptyMap(), Collections.emptyMap());
+      new DependencyInstallationResult(null, Collections.emptyMap(), Collections.emptyMap());
 
   public DependencyInstallationResult(
+      Path virtualSourceRoot,
       Map<String, Path> packageEntryPoints,
       Map<String, Path> packageJsonFiles) {
     this.packageEntryPoints = packageEntryPoints;
     this.packageJsonFiles = packageJsonFiles;
   }
 
+  /**
+   * Returns the virtual source root or <code>null</code> if no virtual source root exists.
+   *
+   * The virtual source root is a directory hierarchy that mirrors the real source
+   * root, where dependencies are installed.
+   */
+  public Path getVirtualSourceRoot() {
+    return virtualSourceRoot;
+  }
+
   /**
    * Returns the mapping from package names to the TypeScript file that should
    * act as its main entry point.

javascript/extractor/src/com/semmle/js/parser/TypeScriptParser.java

@@ -20,6 +20,7 @@
 
 import com.google.gson.JsonArray;
 import com.google.gson.JsonElement;
+import com.google.gson.JsonNull;
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParseException;
 import com.google.gson.JsonParser;
@@ -435,6 +436,9 @@ public ParsedProject openProject(File tsConfigFile, DependencyInstallationResult
     request.add("tsConfig", new JsonPrimitive(tsConfigFile.getPath()));
     request.add("packageEntryPoints", mapToArray(deps.getPackageEntryPoints()));
     request.add("packageJsonFiles", mapToArray(deps.getPackageJsonFiles()));
+    request.add("virtualSourceRoot", deps.getVirtualSourceRoot() == null
+        ? JsonNull.INSTANCE
+        : new JsonPrimitive(deps.getVirtualSourceRoot().toString()));
     JsonObject response = talkToParserWrapper(request);
     try {
       checkResponseType(response, "project-opened");