JS: Add support for TypeScript 4.4

docs/codeql/support/reusables/versions-compilers.rst

@@ -22,7 +22,7 @@
    Eclipse compiler for Java (ECJ) [5]_",``.java``
    JavaScript,ECMAScript 2021 or lower,Not applicable,"``.js``, ``.jsx``, ``.mjs``, ``.es``, ``.es6``, ``.htm``, ``.html``, ``.xhm``, ``.xhtml``, ``.vue``, ``.json``, ``.yaml``, ``.yml``, ``.raml``, ``.xml`` [6]_"
    Python,"2.7, 3.5, 3.6, 3.7, 3.8, 3.9",Not applicable,``.py``
-   TypeScript [7]_,"2.6-4.2",Standard TypeScript compiler,"``.ts``, ``.tsx``"
+   TypeScript [7]_,"2.6-4.4",Standard TypeScript compiler,"``.ts``, ``.tsx``"
 
 .. container:: footnote-group
 

javascript/change-notes/2021-09-01-typescript-4.4.md

@@ -0,0 +1,2 @@
+lgtm,codescanning
+* TypeScript 4.4 is now supported.

javascript/change-notes/2021-09-07-static-initializer.md

@@ -0,0 +1,2 @@
+lgtm,codescanning
+* Support for the ECMAScript proposed feature "class static initialization blocks" has been added.

javascript/extractor/lib/typescript/package.json

@@ -2,7 +2,7 @@
     "name": "typescript-parser-wrapper",
     "private": true,
     "dependencies": {
-        "typescript": "4.3.5"
+        "typescript": "4.4.2"
     },
     "scripts": {
         "build": "tsc --project tsconfig.json",

javascript/extractor/lib/typescript/yarn.lock

@@ -6,7 +6,7 @@
   version "12.7.11"
   resolved node-12.7.11.tgz#be879b52031cfb5d295b047f5462d8ef1a716446
 
-typescript@4.3.5:
-  version "4.3.5"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.3.5.tgz#4d1c37cc16e893973c45a06886b7113234f119f4"
-  integrity sha512-DqQgihaQ9cUrskJo9kIyW/+g0Vxsk8cDtZ52a3NGh0YNTfpUSArXSohyUGnvbPazEPLu398C0UxmKSOrPumUzA==
+typescript@4.4.2:
+  version "4.4.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.4.2.tgz#6d618640d430e3569a1dfb44f7d7e600ced3ee86"
+  integrity sha512-gzP+t5W4hdy4c+68bfcv0t400HVJMMd2+H9B7gae1nQlBzCqvrXX+6GL/b3GAgyTH966pzrZ70/fRjwAtZksSQ==

javascript/extractor/src/com/semmle/jcorn/Parser.java

@@ -83,6 +83,7 @@
 import com.semmle.js.ast.SourceLocation;
 import com.semmle.js.ast.SpreadElement;
 import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.StaticInitializer;
 import com.semmle.js.ast.Super;
 import com.semmle.js.ast.SwitchCase;
 import com.semmle.js.ast.SwitchStatement;
@@ -3244,6 +3245,10 @@ protected MemberDefinition<?> parseClassMember(boolean hadConstructor) {
     PropertyInfo pi = new PropertyInfo(false, isGenerator, methodStartLoc);
     this.parsePropertyName(pi);
     boolean isStatic = isMaybeStatic && this.type != TokenType.parenL;
+    if (isStatic && this.type == TokenType.braceL) {
+      BlockStatement block = parseBlock(false);
+      return new StaticInitializer(block.getLoc(), block);
+    }
     if (isStatic) {
       if (isGenerator) this.unexpected();
       isGenerator = this.eat(TokenType.star);

javascript/extractor/src/com/semmle/js/ast/DefaultVisitor.java

@@ -782,4 +782,9 @@ public R visit(XMLDotDotExpression nd, C c) {
   public R visit(GeneratedCodeExpr nd, C c) {
     return visit((Expression) nd, c);
   }
+
+  @Override
+  public R visit(StaticInitializer nd, C c) {
+    return visit((MemberDefinition<BlockStatement>) nd, c);
+  }
 }

javascript/extractor/src/com/semmle/js/ast/MemberDefinition.java

@@ -9,7 +9,7 @@
  * <p>A member definition has a name and an optional initial value, whose type is given by the type
  * parameter {@code V}.
  */
-public abstract class MemberDefinition<V extends Expression> extends Node {
+public abstract class MemberDefinition<V extends Node> extends Node {
   /** A bitmask of flags defined in {@linkplain DeclarationFlags}. */
   private final int flags;
 
@@ -21,7 +21,7 @@ public abstract class MemberDefinition<V extends Expression> extends Node {
    */
   private final Expression key;
 
-  /** The initial value of the member. */
+  /** The initial value / initializer of the member. */
   private final V value;
 
   /** The decorators applied to this member, if any. */

javascript/extractor/src/com/semmle/js/ast/NodeCopier.java

@@ -897,6 +897,11 @@ public INode visit(XMLDotDotExpression nd, Void c) {
 
   @Override
   public INode visit(GeneratedCodeExpr nd, Void c) {
-  return new GeneratedCodeExpr(visit(nd.getLoc()), nd.getOpeningDelimiter(), nd.getClosingDelimiter(), nd.getBody());
+    return new GeneratedCodeExpr(visit(nd.getLoc()), nd.getOpeningDelimiter(), nd.getClosingDelimiter(), nd.getBody());
+  }
+
+  @Override
+  public INode visit(StaticInitializer nd, Void c) {
+    return new StaticInitializer(visit(nd.getLoc()), copy(nd.getValue()));
   }
 }

javascript/extractor/src/com/semmle/js/ast/StaticInitializer.java

@@ -0,0 +1,21 @@
+package com.semmle.js.ast;
+
+/**
+ * A static initializer block in a class. E.g. ```TypeScript class Foo { static
+ * bar : number; static { Foo.bar = 42; } }
+ */
+public class StaticInitializer extends MemberDefinition<BlockStatement> {
+  public StaticInitializer(SourceLocation loc, BlockStatement body) {
+    super("StaticInitializer", loc, DeclarationFlags.static_, null, body);
+  }
+
+  @Override
+  public boolean isConcrete() {
+    return false;
+  }
+
+  @Override
+  public <C, R> R accept(Visitor<C, R> v, C c) {
+    return v.visit(this, c);
+  }
+}

javascript/extractor/src/com/semmle/js/ast/Visitor.java

@@ -315,4 +315,6 @@ public interface Visitor<C, R> {
   public R visit(XMLDotDotExpression nd, C c);
 
   public R visit(GeneratedCodeExpr generatedCodeExpr, C c);
+
+  public R visit(StaticInitializer nd, C c);
 }

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

@@ -80,6 +80,7 @@
 import com.semmle.js.ast.SourceLocation;
 import com.semmle.js.ast.SpreadElement;
 import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.StaticInitializer;
 import com.semmle.js.ast.Super;
 import com.semmle.js.ast.SwitchCase;
 import com.semmle.js.ast.SwitchStatement;
@@ -1613,6 +1614,8 @@ public Label visit(MemberDefinition<?> nd, Context c) {
       int kind;
       if (nd instanceof MethodDefinition) {
         kind = getMethodKind((MethodDefinition) nd);
+      } else if (nd instanceof StaticInitializer) {
+        kind = 10;
       } else {
         kind = getFieldKind((FieldDefinition) nd);
       }

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

@@ -65,6 +65,7 @@
 import com.semmle.js.ast.SourceLocation;
 import com.semmle.js.ast.SpreadElement;
 import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.StaticInitializer;
 import com.semmle.js.ast.Super;
 import com.semmle.js.ast.SwitchCase;
 import com.semmle.js.ast.SwitchStatement;
@@ -1163,10 +1164,11 @@ public Void visit(ClassExpression nd, SuccessorInfo i) {
     private Map<Expression, AClass> constructor2Class = new LinkedHashMap<>();
 
     private Void visit(Node nd, AClass ac, SuccessorInfo i) {
-      for (MemberDefinition<?> m : ac.getBody().getBody())
-        if (m.isConstructor() && m.isConcrete()) constructor2Class.put(m.getValue(), ac);
+      for (MemberDefinition<?> md : ac.getBody().getBody()) {
+        if (md.isConstructor() && md.isConcrete()) constructor2Class.put((Expression)md.getValue(), ac);
+      }
       visitSequence(ac.getId(), ac.getSuperClass(), ac.getBody(), nd);
-      writeSuccessors(nd, visitSequence(getStaticFields(ac.getBody()), getDecoratorsOfClass(ac), i.getAllSuccessors()));
+      writeSuccessors(nd, visitSequence(getStaticInitializers(ac.getBody()), getDecoratorsOfClass(ac), i.getAllSuccessors()));
       return null;
     }
 
@@ -1618,19 +1620,24 @@ private List<MemberDefinition<?>> getMethods(ClassBody nd) {
       return mds;
     }
 
-    private List<MemberDefinition<?>> getStaticFields(ClassBody nd) {
-      List<MemberDefinition<?>> mds = new ArrayList<>();
-      for (MemberDefinition<?> md : nd.getBody()) {
-        if (md instanceof FieldDefinition && md.isStatic()) mds.add(md);
+    /**
+     * Gets the static fields, and static initializer blocks, from `nd`.
+     */
+    private List<Node> getStaticInitializers(ClassBody nd) {
+      List<Node> nodes = new ArrayList<>();
+      for (MemberDefinition<?> node : nd.getBody()) {
+        if (node instanceof FieldDefinition && ((FieldDefinition)node).isStatic()) nodes.add(node);
+        if (node instanceof StaticInitializer) nodes.add(node.getValue());
       }
-      return mds;
+      return nodes;
     }
 
     private List<FieldDefinition> getConcreteInstanceFields(ClassBody nd) {
       List<FieldDefinition> fds = new ArrayList<>();
-      for (MemberDefinition<?> md : nd.getBody())
+      for (MemberDefinition<?> md : nd.getBody()) {
         if (md instanceof FieldDefinition && !md.isStatic() && md.isConcrete())
           fds.add((FieldDefinition) md);
+      }
       return fds;
     }
 

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

@@ -43,7 +43,7 @@ public class Main {
    * A version identifier that should be updated every time the extractor changes in such a way that
    * it may produce different tuples for the same file under the same {@link ExtractorConfig}.
    */
-  public static final String EXTRACTOR_VERSION = "2021-07-28";
+  public static final String EXTRACTOR_VERSION = "2021-09-01";
 
   public static final Pattern NEWLINE = Pattern.compile("\n");
 

javascript/extractor/src/com/semmle/ts/extractor/TypeScriptASTConverter.java

@@ -82,6 +82,7 @@
 import com.semmle.js.ast.SourceLocation;
 import com.semmle.js.ast.SpreadElement;
 import com.semmle.js.ast.Statement;
+import com.semmle.js.ast.StaticInitializer;
 import com.semmle.js.ast.Super;
 import com.semmle.js.ast.SwitchCase;
 import com.semmle.js.ast.SwitchStatement;
@@ -632,6 +633,8 @@ private Node convertNodeUntyped(JsonObject node, String defaultKind) throws Pars
         return convertWithStatement(node, loc);
       case "YieldExpression":
         return convertYieldExpression(node, loc);
+      case "ClassStaticBlockDeclaration":
+        return convertStaticInitializerBlock(node, loc);
       default:
         throw new ParseError(
             "Unsupported TypeScript syntax " + kind, getSourceLocation(node).getStart());
@@ -866,6 +869,11 @@ private Node convertBinaryExpression(JsonObject node, SourceLocation loc) throws
     }
   }
 
+  private Node convertStaticInitializerBlock(JsonObject node, SourceLocation loc) throws ParseError {
+    BlockStatement body = new BlockStatement(loc, convertChildren(node.get("body").getAsJsonObject(), "statements"));
+    return new StaticInitializer(loc, body);
+  }
+
   private Node convertBlock(JsonObject node, SourceLocation loc) throws ParseError {
     return new BlockStatement(loc, convertChildren(node, "statements"));
   }

javascript/ql/lib/semmle/javascript/Classes.qll

@@ -258,6 +258,13 @@ class ClassDefinition extends @class_definition, ClassOrInterface, AST::ValueNod
   }
 
   override string getAPrimaryQlClass() { result = "ClassDefinition" }
+
+  /**
+   * Gets a static initializer of this class, if any.
+   */
+  BlockStmt getAStaticInitializerBlock() {
+    exists(StaticInitializer init | init.getDeclaringClass() = this | result = init.getBody())
+  }
 }
 
 /**
@@ -1134,6 +1141,18 @@ class ParameterField extends FieldDeclaration, @parameter_field {
   override TypeAnnotation getTypeAnnotation() { result = getParameter().getTypeAnnotation() }
 }
 
+/**
+ * A static initializer in a class.
+ */
+class StaticInitializer extends MemberDefinition, @static_initializer {
+  /**
+   * Gets the body of the static initializer.
+   */
+  BlockStmt getBody() { result.getParent() = this }
+
+  override Expr getNameExpr() { none() }
+}
+
 /**
  * A call signature declared in an interface.
  *

javascript/ql/lib/semmlecode.javascript.dbscheme

@@ -146,7 +146,7 @@ stmt_containers (unique int stmt: @stmt ref,
 jump_targets (unique int jump: @stmt ref,
        int target: @stmt ref);
 
-@stmt_parent = @stmt | @toplevel | @function_expr | @arrow_function_expr;
+@stmt_parent = @stmt | @toplevel | @function_expr | @arrow_function_expr | @static_initializer;
 @stmt_container = @toplevel | @function | @namespace_declaration | @external_module_declaration | @global_augmentation_declaration;
 
 case @stmt.kind of
@@ -521,6 +521,7 @@ case @property.kind of
 | 7 = @enum_member
 | 8 = @proper_field
 | 9 = @parameter_field
+| 10 = @static_initializer
 ;
 
 @property_parent = @obj_expr | @object_pattern | @class_definition | @jsx_element | @interface_definition | @enum_declaration;

javascript/ql/lib/semmlecode.javascript.dbscheme.stats

@@ -774,6 +774,10 @@
 <v>2693</v>
 </e>
 <e>
+<k>@static_initializer</k>
+<v>100</v>
+</e>
+<e>
 <k>@local_type_access</k>
 <v>25491</v>
 </e>

javascript/ql/lib/upgrade.properties

@@ -0,0 +1,2 @@
+description: add @static_initializer property kind
+compatibility: backwards

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

@@ -770,7 +770,37 @@
 | staticFieldsTS | 6 | D | 6 | new D() |
 | staticFieldsTS | 6 | instance | 6 | D |
 | staticFieldsTS | 6 | new D() | 6 | static  ... ew D(); |
-| staticFieldsTS | 6 | static  ... ew D(); | 8 | exit node of <toplevel> |
+| staticFieldsTS | 6 | static  ... ew D(); | 9 | export  ... ;\\n  }\\n} |
+| staticFieldsTS | 9 | E | 9 | constructor |
+| staticFieldsTS | 9 | class E ... ;\\n  }\\n} | 10 | f |
+| staticFieldsTS | 9 | constructor | 9 | function in constructor() {} |
+| staticFieldsTS | 9 | constructor() {} | 9 | class E ... ;\\n  }\\n} |
+| staticFieldsTS | 9 | entry node of () {} | 9 | {} |
+| staticFieldsTS | 9 | export  ... ;\\n  }\\n} | 9 | E |
+| staticFieldsTS | 9 | function in constructor() {} | 9 | constructor() {} |
+| staticFieldsTS | 9 | {} | 9 | exit node of () {} |
+| staticFieldsTS | 10 | f | 10 | false |
+| staticFieldsTS | 10 | false | 10 | static  ...  false; |
+| staticFieldsTS | 10 | static  ...  false; | 11 | static  ... ();\\n  } |
+| staticFieldsTS | 11 | static  ... ();\\n  } | 12 | E.f = new C(); |
+| staticFieldsTS | 12 | C | 12 | new C() |
+| staticFieldsTS | 12 | E | 12 | f |
+| staticFieldsTS | 12 | E.f | 12 | C |
+| staticFieldsTS | 12 | E.f = new C() | 14 | g |
+| staticFieldsTS | 12 | E.f = new C(); | 12 | E |
+| staticFieldsTS | 12 | f | 12 | E.f |
+| staticFieldsTS | 12 | new C() | 12 | E.f = new C() |
+| staticFieldsTS | 14 | 1337 | 14 | static  ... = 1337; |
+| staticFieldsTS | 14 | g | 14 | 1337 |
+| staticFieldsTS | 14 | static  ... = 1337; | 15 | static  ... ();\\n  } |
+| staticFieldsTS | 15 | static  ... ();\\n  } | 16 | E.g = new D(); |
+| staticFieldsTS | 16 | D | 16 | new D() |
+| staticFieldsTS | 16 | E | 16 | g |
+| staticFieldsTS | 16 | E.g | 16 | D |
+| staticFieldsTS | 16 | E.g = new D() | 18 | exit node of <toplevel> |
+| staticFieldsTS | 16 | E.g = new D(); | 16 | E |
+| staticFieldsTS | 16 | g | 16 | E.g |
+| staticFieldsTS | 16 | new D() | 16 | E.g = new D() |
 | switch | 1 | entry node of <toplevel> | 14 | f |
 | switch | 1 | switch  ...   19;\\n} | 2 | x |
 | switch | 2 | x | 6 | case\\n   ...     19; |

javascript/ql/test/library-tests/CFG/StaticInit.expected

@@ -14,3 +14,5 @@
 | staticFields.js:2:3:2:28 | static  ... ew C(); | Field initializer occurs after its class is created |
 | staticFieldsTS.ts:2:3:2:31 | static  ... ew C(); | Field initializer occurs after its class is created |
 | staticFieldsTS.ts:6:3:6:31 | static  ... ew D(); | Field initializer occurs after its class is created |
+| staticFieldsTS.ts:10:3:10:32 | static  ...  false; | Field initializer occurs after its class is created |
+| staticFieldsTS.ts:14:3:14:30 | static  ... = 1337; | Field initializer occurs after its class is created |

javascript/ql/test/library-tests/CFG/staticFieldsTS.ts

@@ -5,3 +5,14 @@ class C {
 export class D {
   static instance: D = new D();
 }
+
+export class E {
+  static f: C | boolean = false;
+  static {
+    E.f = new C();
+  }
+  static g: D | number = 1337;
+  static {
+    E.g = new D();
+  }
+}

javascript/ql/test/library-tests/Classes/staticInitializer.js

@@ -0,0 +1,18 @@
+class MyClass {
+  static x = 1;
+  constructor() {
+    this.y = 2;
+  }
+  static {
+    MyClass.z = 3;
+  }
+  foo() {
+    this.t = 4;
+  }
+  static bar() {
+    this.u = 5;
+  }
+  static {
+    this.v = 6;
+  }
+}