Update analyzer to 2.1.0 and avoid direct use of pub

lib/src/element_type.dart

@@ -31,7 +31,7 @@ abstract class ElementType extends Privacy with CommentReferable, Nameable {
         f.element.kind == ElementKind.DYNAMIC ||
         f.element.kind == ElementKind.NEVER) {
       if (f is FunctionType) {
-        if (f.aliasElement != null) {
+        if (f.alias?.element != null) {
           return AliasedFunctionTypeElementType(
               f, library, packageGraph, returnedFrom);
         }
@@ -44,14 +44,14 @@ abstract class ElementType extends Privacy with CommentReferable, Nameable {
       // In that case it is an actual type alias of some kind (generic
       // or otherwise.   Here however aliasElement signals that this is a
       // type referring to an alias.
-      if (f is! TypeAliasElement && f.aliasElement != null) {
+      if (f is! TypeAliasElement && f.alias?.element != null) {
         return AliasedElementType(
             f, library, packageGraph, element, returnedFrom);
       }
       assert(f is ParameterizedType || f is TypeParameterType);
       // TODO(jcollins-g): strip out all the cruft that's accumulated
       // here for non-generic type aliases.
-      var isGenericTypeAlias = f.aliasElement != null && f is! InterfaceType;
+      var isGenericTypeAlias = f.alias?.element != null && f is! InterfaceType;
       if (f is FunctionType) {
         assert(f is ParameterizedType);
         // This is an indication we have an extremely out of date analyzer....
@@ -188,8 +188,8 @@ class AliasedFunctionTypeElementType extends FunctionTypeElementType
   AliasedFunctionTypeElementType(FunctionType f, Library library,
       PackageGraph packageGraph, ElementType returnedFrom)
       : super(f, library, packageGraph, returnedFrom) {
-    assert(type.aliasElement != null);
-    assert(type.aliasArguments != null);
+    assert(type.alias?.element != null);
+    assert(type.alias?.typeArguments != null);
   }
 
   @override
@@ -220,18 +220,18 @@ class ParameterizedElementType extends DefinedElementType with Rendered {
 /// A [ElementType] whose underlying type was referrred to by a type alias.
 mixin Aliased implements ElementType {
   @override
-  String get name => type.aliasElement.name;
+  String get name => type.alias.element.name;
 
   @override
   bool get isTypedef => true;
 
   ModelElement _aliasElement;
   ModelElement get aliasElement => _aliasElement ??=
-      ModelElement.fromElement(type.aliasElement, packageGraph);
+      ModelElement.fromElement(type.alias.element, packageGraph);
 
   Iterable<ElementType> _aliasArguments;
   Iterable<ElementType> get aliasArguments =>
-      _aliasArguments ??= type.aliasArguments
+      _aliasArguments ??= type.alias.typeArguments
           .map((f) => ElementType.from(f, library, packageGraph))
           .toList(growable: false);
 }
@@ -240,7 +240,7 @@ class AliasedElementType extends ParameterizedElementType with Aliased {
   AliasedElementType(ParameterizedType type, Library library,
       PackageGraph packageGraph, ModelElement element, ElementType returnedFrom)
       : super(type, library, packageGraph, element, returnedFrom) {
-    assert(type.aliasElement != null);
+    assert(type.alias?.element != null);
   }
 
   @override
@@ -429,7 +429,7 @@ class CallableElementType extends DefinedElementType with Rendered, Callable {
   Iterable<ElementType> _typeArguments;
   @override
   Iterable<ElementType> get typeArguments =>
-      _typeArguments ??= (type.aliasArguments ?? [])
+      _typeArguments ??= (type.alias?.typeArguments ?? [])
           .map((f) => ElementType.from(f, library, packageGraph))
           .toList(growable: false);
 }

lib/src/model/package_builder.dart

@@ -155,7 +155,7 @@ class PubPackageBuilder implements PackageBuilder {
     var analysisContext = contextCollection.contextFor(config.inputDir);
     var session = analysisContext.currentSession;
     // Allow dart source files with inappropriate suffixes (#1897).
-    final library = await session.getResolvedLibrary2(filePath);
+    final library = await session.getResolvedLibrary(filePath);
     if (library is ResolvedLibraryResult) {
       final libraryElement = library.element;
       var restoredUri = libraryElement.source.uri.toString();

lib/src/package_meta.dart

@@ -27,10 +27,11 @@ class PackageMetaFailure extends DartdocFailure {
 }
 
 /// For each list in this list, at least one of the given paths must exist
-/// for this to be detected as an SDK.
-final List<List<String>> __sdkDirFilePathsPosix = [
+/// for this to be detected as an SDK.  Update [_writeMockSdkBinFiles] in
+/// `test/src/utils.dart` if removing any entries here.
+const List<List<String>> _sdkDirFilePathsPosix = [
   ['bin/dart.bat', 'bin/dart.exe', 'bin/dart'],
-  ['bin/pub.bat', 'bin/pub'],
+  ['include/dart_version.h'],
   ['lib/core/core.dart'],
 ];
 
@@ -161,15 +162,15 @@ abstract class PubPackageMeta extends PackageMeta {
     if (__sdkDirFilePaths == null) {
       __sdkDirFilePaths = [];
       if (Platform.isWindows) {
-        for (var paths in __sdkDirFilePathsPosix) {
+        for (var paths in _sdkDirFilePathsPosix) {
           var windowsPaths = [
             for (var path in paths)
               p.joinAll(p.Context(style: p.Style.posix).split(path)),
           ];
           __sdkDirFilePaths.add(windowsPaths);
         }
       } else {
-        __sdkDirFilePaths = __sdkDirFilePathsPosix;
+        __sdkDirFilePaths = _sdkDirFilePathsPosix;
       }
     }
     return __sdkDirFilePaths;
@@ -342,12 +343,13 @@ class _FilePackageMeta extends PubPackageMeta {
     List<String> parameters;
     if (requiresFlutter) {
       binPath = p.join(flutterRoot, 'bin', 'flutter');
+      if (Platform.isWindows) binPath += '.bat';
       parameters = ['pub', 'get'];
     } else {
-      binPath = p.join(p.dirname(Platform.resolvedExecutable), 'pub');
-      parameters = ['get'];
+      binPath = p.join(p.dirname(Platform.resolvedExecutable), 'dart');
+      if (Platform.isWindows) binPath += '.exe';
+      parameters = ['pub', 'get'];
     }
-    if (Platform.isWindows) binPath += '.bat';
 
     var result =
         Process.runSync(binPath, parameters, workingDirectory: dir.path);

pubspec.yaml

@@ -7,7 +7,7 @@ environment:
   sdk: '>=2.11.99 <3.0.0'
 
 dependencies:
-  analyzer: ^2.0.0
+  analyzer: ^2.1.0
   args: ^2.0.0
   charcode: ^1.2.0
   collection: ^1.2.0

test/src/utils.dart

@@ -134,7 +134,8 @@ Folder writeMockSdkFiles(MockSdk mockSdk) {
 void _writeMockSdkBinFiles(Folder root) {
   var sdkBinFolder = root.getChildAssumingFolder('bin');
   sdkBinFolder.getChildAssumingFile('dart').writeAsStringSync('');
-  sdkBinFolder.getChildAssumingFile('pub').writeAsStringSync('');
+  var sdkIncludeFolder = root.getChildAssumingFolder('include');
+  sdkIncludeFolder.getChildAssumingFile('dart_version.h').writeAsStringSync('');
 }
 
 /// Writes a package named [packageName], with [resourceProvider], to the