source: trip-planner-front/node_modules/@angular/compiler-cli/src/transformers/downlevel_decorators_transform.js@ 59329aa

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
(function (factory) {
    if (typeof module === "object" && typeof module.exports === "object") {
        var v = factory(require, exports);
        if (v !== undefined) module.exports = v;
    }
    else if (typeof define === "function" && define.amd) {
        define("@angular/compiler-cli/src/transformers/downlevel_decorators_transform", ["require", "exports", "tslib", "typescript", "@angular/compiler-cli/src/transformers/patch_alias_reference_resolution"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.getDownlevelDecoratorsTransform = void 0;
    var tslib_1 = require("tslib");
    var ts = require("typescript");
    var patch_alias_reference_resolution_1 = require("@angular/compiler-cli/src/transformers/patch_alias_reference_resolution");
    /**
     * Whether a given decorator should be treated as an Angular decorator.
     * Either it's used in @angular/core, or it's imported from there.
     */
    function isAngularDecorator(decorator, isCore) {
        return isCore || (decorator.import !== null && decorator.import.from === '@angular/core');
    }
    /*
     #####################################################################
      Code below has been extracted from the tsickle decorator downlevel transformer
      and a few local modifications have been applied:
    
        1. Tsickle by default processed all decorators that had the `@Annotation` JSDoc.
           We modified the transform to only be concerned with known Angular decorators.
        2. Tsickle by default added `@nocollapse` to all generated `ctorParameters` properties.
           We only do this when `annotateForClosureCompiler` is enabled.
        3. Tsickle does not handle union types for dependency injection. i.e. if a injected type
           is denoted with `@Optional`, the actual type could be set to `T | null`.
           See: https://github.com/angular/angular-cli/commit/826803d0736b807867caff9f8903e508970ad5e4.
        4. Tsickle relied on `emitDecoratorMetadata` to be set to `true`. This is due to a limitation
           in TypeScript transformers that never has been fixed. We were able to work around this
           limitation so that `emitDecoratorMetadata` doesn't need to be specified.
           See: `patchAliasReferenceResolution` for more details.
    
      Here is a link to the tsickle revision on which this transformer is based:
      https://github.com/angular/tsickle/blob/fae06becb1570f491806060d83f29f2d50c43cdd/src/decorator_downlevel_transformer.ts
     #####################################################################
    */
    var DECORATOR_INVOCATION_JSDOC_TYPE = '!Array<{type: !Function, args: (undefined|!Array<?>)}>';
    /**
     * Extracts the type of the decorator (the function or expression invoked), as well as all the
     * arguments passed to the decorator. Returns an AST with the form:
     *
     *     // For @decorator(arg1, arg2)
     *     { type: decorator, args: [arg1, arg2] }
     */
    function extractMetadataFromSingleDecorator(decorator, diagnostics) {
        var e_1, _a;
        var metadataProperties = [];
        var expr = decorator.expression;
        switch (expr.kind) {
            case ts.SyntaxKind.Identifier:
                // The decorator was a plain @Foo.
                metadataProperties.push(ts.createPropertyAssignment('type', expr));
                break;
            case ts.SyntaxKind.CallExpression:
                // The decorator was a call, like @Foo(bar).
                var call = expr;
                metadataProperties.push(ts.createPropertyAssignment('type', call.expression));
                if (call.arguments.length) {
                    var args = [];
                    try {
                        for (var _b = tslib_1.__values(call.arguments), _c = _b.next(); !_c.done; _c = _b.next()) {
                            var arg = _c.value;
                            args.push(arg);
                        }
                    }
                    catch (e_1_1) { e_1 = { error: e_1_1 }; }
                    finally {
                        try {
                            if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                        }
                        finally { if (e_1) throw e_1.error; }
                    }
                    var argsArrayLiteral = ts.createArrayLiteral(args);
                    argsArrayLiteral.elements.hasTrailingComma = true;
                    metadataProperties.push(ts.createPropertyAssignment('args', argsArrayLiteral));
                }
                break;
            default:
                diagnostics.push({
                    file: decorator.getSourceFile(),
                    start: decorator.getStart(),
                    length: decorator.getEnd() - decorator.getStart(),
                    messageText: ts.SyntaxKind[decorator.kind] + " not implemented in gathering decorator metadata.",
                    category: ts.DiagnosticCategory.Error,
                    code: 0,
                });
                break;
        }
        return ts.createObjectLiteral(metadataProperties);
    }
    /**
     * createCtorParametersClassProperty creates a static 'ctorParameters' property containing
     * downleveled decorator information.
     *
     * The property contains an arrow function that returns an array of object literals of the shape:
     *     static ctorParameters = () => [{
     *       type: SomeClass|undefined,  // the type of the param that's decorated, if it's a value.
     *       decorators: [{
     *         type: DecoratorFn,  // the type of the decorator that's invoked.
     *         args: [ARGS],       // the arguments passed to the decorator.
     *       }]
     *     }];
     */
    function createCtorParametersClassProperty(diagnostics, entityNameToExpression, ctorParameters, isClosureCompilerEnabled) {
        var e_2, _a, e_3, _b;
        var params = [];
        try {
            for (var ctorParameters_1 = tslib_1.__values(ctorParameters), ctorParameters_1_1 = ctorParameters_1.next(); !ctorParameters_1_1.done; ctorParameters_1_1 = ctorParameters_1.next()) {
                var ctorParam = ctorParameters_1_1.value;
                if (!ctorParam.type && ctorParam.decorators.length === 0) {
                    params.push(ts.createNull());
                    continue;
                }
                var paramType = ctorParam.type ?
                    typeReferenceToExpression(entityNameToExpression, ctorParam.type) :
                    undefined;
                var members = [ts.createPropertyAssignment('type', paramType || ts.createIdentifier('undefined'))];
                var decorators = [];
                try {
                    for (var _c = (e_3 = void 0, tslib_1.__values(ctorParam.decorators)), _d = _c.next(); !_d.done; _d = _c.next()) {
                        var deco = _d.value;
                        decorators.push(extractMetadataFromSingleDecorator(deco, diagnostics));
                    }
                }
                catch (e_3_1) { e_3 = { error: e_3_1 }; }
                finally {
                    try {
                        if (_d && !_d.done && (_b = _c.return)) _b.call(_c);
                    }
                    finally { if (e_3) throw e_3.error; }
                }
                if (decorators.length) {
                    members.push(ts.createPropertyAssignment('decorators', ts.createArrayLiteral(decorators)));
                }
                params.push(ts.createObjectLiteral(members));
            }
        }
        catch (e_2_1) { e_2 = { error: e_2_1 }; }
        finally {
            try {
                if (ctorParameters_1_1 && !ctorParameters_1_1.done && (_a = ctorParameters_1.return)) _a.call(ctorParameters_1);
            }
            finally { if (e_2) throw e_2.error; }
        }
        var initializer = ts.createArrowFunction(undefined, undefined, [], undefined, ts.createToken(ts.SyntaxKind.EqualsGreaterThanToken), ts.createArrayLiteral(params, true));
        var ctorProp = ts.createProperty(undefined, [ts.createToken(ts.SyntaxKind.StaticKeyword)], 'ctorParameters', undefined, undefined, initializer);
        if (isClosureCompilerEnabled) {
            ts.setSyntheticLeadingComments(ctorProp, [
                {
                    kind: ts.SyntaxKind.MultiLineCommentTrivia,
                    text: [
                        "*",
                        " * @type {function(): !Array<(null|{",
                        " *   type: ?,",
                        " *   decorators: (undefined|" + DECORATOR_INVOCATION_JSDOC_TYPE + "),",
                        " * })>}",
                        " * @nocollapse",
                        " ",
                    ].join('\n'),
                    pos: -1,
                    end: -1,
                    hasTrailingNewLine: true,
                },
            ]);
        }
        return ctorProp;
    }
    /**
     * Returns an expression representing the (potentially) value part for the given node.
     *
     * This is a partial re-implementation of TypeScript's serializeTypeReferenceNode. This is a
     * workaround for https://github.com/Microsoft/TypeScript/issues/17516 (serializeTypeReferenceNode
     * not being exposed). In practice this implementation is sufficient for Angular's use of type
     * metadata.
     */
    function typeReferenceToExpression(entityNameToExpression, node) {
        var kind = node.kind;
        if (ts.isLiteralTypeNode(node)) {
            // Treat literal types like their base type (boolean, string, number).
            kind = node.literal.kind;
        }
        switch (kind) {
            case ts.SyntaxKind.FunctionType:
            case ts.SyntaxKind.ConstructorType:
                return ts.createIdentifier('Function');
            case ts.SyntaxKind.ArrayType:
            case ts.SyntaxKind.TupleType:
                return ts.createIdentifier('Array');
            case ts.SyntaxKind.TypePredicate:
            case ts.SyntaxKind.TrueKeyword:
            case ts.SyntaxKind.FalseKeyword:
            case ts.SyntaxKind.BooleanKeyword:
                return ts.createIdentifier('Boolean');
            case ts.SyntaxKind.StringLiteral:
            case ts.SyntaxKind.StringKeyword:
                return ts.createIdentifier('String');
            case ts.SyntaxKind.ObjectKeyword:
                return ts.createIdentifier('Object');
            case ts.SyntaxKind.NumberKeyword:
            case ts.SyntaxKind.NumericLiteral:
                return ts.createIdentifier('Number');
            case ts.SyntaxKind.TypeReference:
                var typeRef = node;
                // Ignore any generic types, just return the base type.
                return entityNameToExpression(typeRef.typeName);
            case ts.SyntaxKind.UnionType:
                var childTypeNodes = node
                    .types.filter(function (t) { return !(ts.isLiteralTypeNode(t) && t.literal.kind === ts.SyntaxKind.NullKeyword); });
                return childTypeNodes.length === 1 ?
                    typeReferenceToExpression(entityNameToExpression, childTypeNodes[0]) :
                    undefined;
            default:
                return undefined;
        }
    }
    /**
     * Checks whether a given symbol refers to a value that exists at runtime (as distinct from a type).
     *
     * Expands aliases, which is important for the case where
     *   import * as x from 'some-module';
     * and x is now a value (the module object).
     */
    function symbolIsRuntimeValue(typeChecker, symbol) {
        if (symbol.flags & ts.SymbolFlags.Alias) {
            symbol = typeChecker.getAliasedSymbol(symbol);
        }
        // Note that const enums are a special case, because
        // while they have a value, they don't exist at runtime.
        return (symbol.flags & ts.SymbolFlags.Value & ts.SymbolFlags.ConstEnumExcludes) !== 0;
    }
    /**
     * Gets a transformer for downleveling Angular decorators.
     * @param typeChecker Reference to the program's type checker.
     * @param host Reflection host that is used for determining decorators.
     * @param diagnostics List which will be populated with diagnostics if any.
     * @param isCore Whether the current TypeScript program is for the `@angular/core` package.
     * @param isClosureCompilerEnabled Whether closure annotations need to be added where needed.
     * @param skipClassDecorators Whether class decorators should be skipped from downleveling.
     *   This is useful for JIT mode where class decorators should be preserved as they could rely
     *   on immediate execution. e.g. downleveling `@Injectable` means that the injectable factory
     *   is not created, and injecting the token will not work. If this decorator would not be
     *   downleveled, the `Injectable` decorator will execute immediately on file load, and
     *   Angular will generate the corresponding injectable factory.
     */
    function getDownlevelDecoratorsTransform(typeChecker, host, diagnostics, isCore, isClosureCompilerEnabled, skipClassDecorators) {
        function addJSDocTypeAnnotation(node, jsdocType) {
            if (!isClosureCompilerEnabled) {
                return;
            }
            ts.setSyntheticLeadingComments(node, [
                {
                    kind: ts.SyntaxKind.MultiLineCommentTrivia,
                    text: "* @type {" + jsdocType + "} ",
                    pos: -1,
                    end: -1,
                    hasTrailingNewLine: true,
                },
            ]);
        }
        /**
         * Takes a list of decorator metadata object ASTs and produces an AST for a
         * static class property of an array of those metadata objects.
         */
        function createDecoratorClassProperty(decoratorList) {
            var modifier = ts.createToken(ts.SyntaxKind.StaticKeyword);
            var initializer = ts.createArrayLiteral(decoratorList, true);
            // NB: the .decorators property does not get a @nocollapse property. There
            // is no good reason why - it means .decorators is not runtime accessible
            // if you compile with collapse properties, whereas propDecorators is,
            // which doesn't follow any stringent logic. However this has been the
            // case previously, and adding it back in leads to substantial code size
            // increases as Closure fails to tree shake these props
            // without @nocollapse.
            var prop = ts.createProperty(undefined, [modifier], 'decorators', undefined, undefined, initializer);
            addJSDocTypeAnnotation(prop, DECORATOR_INVOCATION_JSDOC_TYPE);
            return prop;
        }
        /**
         * createPropDecoratorsClassProperty creates a static 'propDecorators'
         * property containing type information for every property that has a
         * decorator applied.
         *
         *     static propDecorators: {[key: string]: {type: Function, args?:
         * any[]}[]} = { propA: [{type: MyDecorator, args: [1, 2]}, ...],
         *       ...
         *     };
         */
        function createPropDecoratorsClassProperty(diagnostics, properties) {
            var e_4, _a;
            //  `static propDecorators: {[key: string]: ` + {type: Function, args?:
            //  any[]}[] + `} = {\n`);
            var entries = [];
            try {
                for (var _b = tslib_1.__values(properties.entries()), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var _d = tslib_1.__read(_c.value, 2), name = _d[0], decorators = _d[1];
                    entries.push(ts.createPropertyAssignment(name, ts.createArrayLiteral(decorators.map(function (deco) { return extractMetadataFromSingleDecorator(deco, diagnostics); }))));
                }
            }
            catch (e_4_1) { e_4 = { error: e_4_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_4) throw e_4.error; }
            }
            var initializer = ts.createObjectLiteral(entries, true);
            var prop = ts.createProperty(undefined, [ts.createToken(ts.SyntaxKind.StaticKeyword)], 'propDecorators', undefined, undefined, initializer);
            addJSDocTypeAnnotation(prop, "!Object<string, " + DECORATOR_INVOCATION_JSDOC_TYPE + ">");
            return prop;
        }
        return function (context) {
            // Ensure that referenced type symbols are not elided by TypeScript. Imports for
            // such parameter type symbols previously could be type-only, but now might be also
            // used in the `ctorParameters` static property as a value. We want to make sure
            // that TypeScript does not elide imports for such type references. Read more
            // about this in the description for `loadIsReferencedAliasDeclarationPatch`.
            var referencedParameterTypes = patch_alias_reference_resolution_1.loadIsReferencedAliasDeclarationPatch(context);
            /**
             * Converts an EntityName (from a type annotation) to an expression (accessing a value).
             *
             * For a given qualified name, this walks depth first to find the leftmost identifier,
             * and then converts the path into a property access that can be used as expression.
             */
            function entityNameToExpression(name) {
                var symbol = typeChecker.getSymbolAtLocation(name);
                // Check if the entity name references a symbol that is an actual value. If it is not, it
                // cannot be referenced by an expression, so return undefined.
                if (!symbol || !symbolIsRuntimeValue(typeChecker, symbol) || !symbol.declarations ||
                    symbol.declarations.length === 0) {
                    return undefined;
                }
                // If we deal with a qualified name, build up a property access expression
                // that could be used in the JavaScript output.
                if (ts.isQualifiedName(name)) {
                    var containerExpr = entityNameToExpression(name.left);
                    if (containerExpr === undefined) {
                        return undefined;
                    }
                    return ts.createPropertyAccess(containerExpr, name.right);
                }
                var decl = symbol.declarations[0];
                // If the given entity name has been resolved to an alias import declaration,
                // ensure that the alias declaration is not elided by TypeScript, and use its
                // name identifier to reference it at runtime.
                if (patch_alias_reference_resolution_1.isAliasImportDeclaration(decl)) {
                    referencedParameterTypes.add(decl);
                    // If the entity name resolves to an alias import declaration, we reference the
                    // entity based on the alias import name. This ensures that TypeScript properly
                    // resolves the link to the import. Cloning the original entity name identifier
                    // could lead to an incorrect resolution at local scope. e.g. Consider the following
                    // snippet: `constructor(Dep: Dep) {}`. In such a case, the local `Dep` identifier
                    // would resolve to the actual parameter name, and not to the desired import.
                    // This happens because the entity name identifier symbol is internally considered
                    // as type-only and therefore TypeScript tries to resolve it as value manually.
                    // We can help TypeScript and avoid this non-reliable resolution by using an identifier
                    // that is not type-only and is directly linked to the import alias declaration.
                    if (decl.name !== undefined) {
                        return ts.getMutableClone(decl.name);
                    }
                }
                // Clone the original entity name identifier so that it can be used to reference
                // its value at runtime. This is used when the identifier is resolving to a file
                // local declaration (otherwise it would resolve to an alias import declaration).
                return ts.getMutableClone(name);
            }
            /**
             * Transforms a class element. Returns a three tuple of name, transformed element, and
             * decorators found. Returns an undefined name if there are no decorators to lower on the
             * element, or the element has an exotic name.
             */
            function transformClassElement(element) {
                var e_5, _a;
                element = ts.visitEachChild(element, decoratorDownlevelVisitor, context);
                var decoratorsToKeep = [];
                var toLower = [];
                var decorators = host.getDecoratorsOfDeclaration(element) || [];
                try {
                    for (var decorators_1 = tslib_1.__values(decorators), decorators_1_1 = decorators_1.next(); !decorators_1_1.done; decorators_1_1 = decorators_1.next()) {
                        var decorator = decorators_1_1.value;
                        // We only deal with concrete nodes in TypeScript sources, so we don't
                        // need to handle synthetically created decorators.
                        var decoratorNode = decorator.node;
                        if (!isAngularDecorator(decorator, isCore)) {
                            decoratorsToKeep.push(decoratorNode);
                            continue;
                        }
                        toLower.push(decoratorNode);
                    }
                }
                catch (e_5_1) { e_5 = { error: e_5_1 }; }
                finally {
                    try {
                        if (decorators_1_1 && !decorators_1_1.done && (_a = decorators_1.return)) _a.call(decorators_1);
                    }
                    finally { if (e_5) throw e_5.error; }
                }
                if (!toLower.length)
                    return [undefined, element, []];
                if (!element.name || !ts.isIdentifier(element.name)) {
                    // Method has a weird name, e.g.
                    //   [Symbol.foo]() {...}
                    diagnostics.push({
                        file: element.getSourceFile(),
                        start: element.getStart(),
                        length: element.getEnd() - element.getStart(),
                        messageText: "Cannot process decorators for class element with non-analyzable name.",
                        category: ts.DiagnosticCategory.Error,
                        code: 0,
                    });
                    return [undefined, element, []];
                }
                var name = element.name.text;
                var mutable = ts.getMutableClone(element);
                mutable.decorators = decoratorsToKeep.length ?
                    ts.setTextRange(ts.createNodeArray(decoratorsToKeep), mutable.decorators) :
                    undefined;
                return [name, mutable, toLower];
            }
            /**
             * Transforms a constructor. Returns the transformed constructor and the list of parameter
             * information collected, consisting of decorators and optional type.
             */
            function transformConstructor(ctor) {
                var e_6, _a, e_7, _b;
                ctor = ts.visitEachChild(ctor, decoratorDownlevelVisitor, context);
                var newParameters = [];
                var oldParameters = ts.visitParameterList(ctor.parameters, decoratorDownlevelVisitor, context);
                var parametersInfo = [];
                try {
                    for (var oldParameters_1 = tslib_1.__values(oldParameters), oldParameters_1_1 = oldParameters_1.next(); !oldParameters_1_1.done; oldParameters_1_1 = oldParameters_1.next()) {
                        var param = oldParameters_1_1.value;
                        var decoratorsToKeep = [];
                        var paramInfo = { decorators: [], type: null };
                        var decorators = host.getDecoratorsOfDeclaration(param) || [];
                        try {
                            for (var decorators_2 = (e_7 = void 0, tslib_1.__values(decorators)), decorators_2_1 = decorators_2.next(); !decorators_2_1.done; decorators_2_1 = decorators_2.next()) {
                                var decorator = decorators_2_1.value;
                                // We only deal with concrete nodes in TypeScript sources, so we don't
                                // need to handle synthetically created decorators.
                                var decoratorNode = decorator.node;
                                if (!isAngularDecorator(decorator, isCore)) {
                                    decoratorsToKeep.push(decoratorNode);
                                    continue;
                                }
                                paramInfo.decorators.push(decoratorNode);
                            }
                        }
                        catch (e_7_1) { e_7 = { error: e_7_1 }; }
                        finally {
                            try {
                                if (decorators_2_1 && !decorators_2_1.done && (_b = decorators_2.return)) _b.call(decorators_2);
                            }
                            finally { if (e_7) throw e_7.error; }
                        }
                        if (param.type) {
                            // param has a type provided, e.g. "foo: Bar".
                            // The type will be emitted as a value expression in entityNameToExpression, which takes
                            // care not to emit anything for types that cannot be expressed as a value (e.g.
                            // interfaces).
                            paramInfo.type = param.type;
                        }
                        parametersInfo.push(paramInfo);
                        var newParam = ts.updateParameter(param, 
                        // Must pass 'undefined' to avoid emitting decorator metadata.
                        decoratorsToKeep.length ? decoratorsToKeep : undefined, param.modifiers, param.dotDotDotToken, param.name, param.questionToken, param.type, param.initializer);
                        newParameters.push(newParam);
                    }
                }
                catch (e_6_1) { e_6 = { error: e_6_1 }; }
                finally {
                    try {
                        if (oldParameters_1_1 && !oldParameters_1_1.done && (_a = oldParameters_1.return)) _a.call(oldParameters_1);
                    }
                    finally { if (e_6) throw e_6.error; }
                }
                var updated = ts.updateConstructor(ctor, ctor.decorators, ctor.modifiers, newParameters, ts.visitFunctionBody(ctor.body, decoratorDownlevelVisitor, context));
                return [updated, parametersInfo];
            }
            /**
             * Transforms a single class declaration:
             * - dispatches to strip decorators on members
             * - converts decorators on the class to annotations
             * - creates a ctorParameters property
             * - creates a propDecorators property
             */
            function transformClassDeclaration(classDecl) {
                var e_8, _a, e_9, _b;
                classDecl = ts.getMutableClone(classDecl);
                var newMembers = [];
                var decoratedProperties = new Map();
                var classParameters = null;
                try {
                    for (var _c = tslib_1.__values(classDecl.members), _d = _c.next(); !_d.done; _d = _c.next()) {
                        var member = _d.value;
                        switch (member.kind) {
                            case ts.SyntaxKind.PropertyDeclaration:
                            case ts.SyntaxKind.GetAccessor:
                            case ts.SyntaxKind.SetAccessor:
                            case ts.SyntaxKind.MethodDeclaration: {
                                var _e = tslib_1.__read(transformClassElement(member), 3), name = _e[0], newMember = _e[1], decorators = _e[2];
                                newMembers.push(newMember);
                                if (name)
                                    decoratedProperties.set(name, decorators);
                                continue;
                            }
                            case ts.SyntaxKind.Constructor: {
                                var ctor = member;
                                if (!ctor.body)
                                    break;
                                var _f = tslib_1.__read(transformConstructor(member), 2), newMember = _f[0], parametersInfo = _f[1];
                                classParameters = parametersInfo;
                                newMembers.push(newMember);
                                continue;
                            }
                            default:
                                break;
                        }
                        newMembers.push(ts.visitEachChild(member, decoratorDownlevelVisitor, context));
                    }
                }
                catch (e_8_1) { e_8 = { error: e_8_1 }; }
                finally {
                    try {
                        if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
                    }
                    finally { if (e_8) throw e_8.error; }
                }
                // The `ReflectionHost.getDecoratorsOfDeclaration()` method will not return certain kinds of
                // decorators that will never be Angular decorators. So we cannot rely on it to capture all
                // the decorators that should be kept. Instead we start off with a set of the raw decorators
                // on the class, and only remove the ones that have been identified for downleveling.
                var decoratorsToKeep = new Set(classDecl.decorators);
                var possibleAngularDecorators = host.getDecoratorsOfDeclaration(classDecl) || [];
                var hasAngularDecorator = false;
                var decoratorsToLower = [];
                try {
                    for (var possibleAngularDecorators_1 = tslib_1.__values(possibleAngularDecorators), possibleAngularDecorators_1_1 = possibleAngularDecorators_1.next(); !possibleAngularDecorators_1_1.done; possibleAngularDecorators_1_1 = possibleAngularDecorators_1.next()) {
                        var decorator = possibleAngularDecorators_1_1.value;
                        // We only deal with concrete nodes in TypeScript sources, so we don't
                        // need to handle synthetically created decorators.
                        var decoratorNode = decorator.node;
                        var isNgDecorator = isAngularDecorator(decorator, isCore);
                        // Keep track if we come across an Angular class decorator. This is used
                        // for to determine whether constructor parameters should be captured or not.
                        if (isNgDecorator) {
                            hasAngularDecorator = true;
                        }
                        if (isNgDecorator && !skipClassDecorators) {
                            decoratorsToLower.push(extractMetadataFromSingleDecorator(decoratorNode, diagnostics));
                            decoratorsToKeep.delete(decoratorNode);
                        }
                    }
                }
                catch (e_9_1) { e_9 = { error: e_9_1 }; }
                finally {
                    try {
                        if (possibleAngularDecorators_1_1 && !possibleAngularDecorators_1_1.done && (_b = possibleAngularDecorators_1.return)) _b.call(possibleAngularDecorators_1);
                    }
                    finally { if (e_9) throw e_9.error; }
                }
                if (decoratorsToLower.length) {
                    newMembers.push(createDecoratorClassProperty(decoratorsToLower));
                }
                if (classParameters) {
                    if (hasAngularDecorator || classParameters.some(function (p) { return !!p.decorators.length; })) {
                        // Capture constructor parameters if the class has Angular decorator applied,
                        // or if any of the parameters has decorators applied directly.
                        newMembers.push(createCtorParametersClassProperty(diagnostics, entityNameToExpression, classParameters, isClosureCompilerEnabled));
                    }
                }
                if (decoratedProperties.size) {
                    newMembers.push(createPropDecoratorsClassProperty(diagnostics, decoratedProperties));
                }
                var members = ts.setTextRange(ts.createNodeArray(newMembers, classDecl.members.hasTrailingComma), classDecl.members);
                return ts.updateClassDeclaration(classDecl, decoratorsToKeep.size ? Array.from(decoratorsToKeep) : undefined, classDecl.modifiers, classDecl.name, classDecl.typeParameters, classDecl.heritageClauses, members);
            }
            /**
             * Transformer visitor that looks for Angular decorators and replaces them with
             * downleveled static properties. Also collects constructor type metadata for
             * class declaration that are decorated with an Angular decorator.
             */
            function decoratorDownlevelVisitor(node) {
                if (ts.isClassDeclaration(node)) {
                    return transformClassDeclaration(node);
                }
                return ts.visitEachChild(node, decoratorDownlevelVisitor, context);
            }
            return function (sf) {
                // Downlevel decorators and constructor parameter types. We will keep track of all
                // referenced constructor parameter types so that we can instruct TypeScript to
                // not elide their imports if they previously were only type-only.
                return ts.visitEachChild(sf, decoratorDownlevelVisitor, context);
            };
        };
    }
    exports.getDownlevelDecoratorsTransform = getDownlevelDecoratorsTransform;
});
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport * as ts from 'typescript';\nimport {Decorator, ReflectionHost} from '../ngtsc/reflection';\nimport {isAliasImportDeclaration, loadIsReferencedAliasDeclarationPatch} from './patch_alias_reference_resolution';\n\n/**\n * Whether a given decorator should be treated as an Angular decorator.\n * Either it's used in @angular/core, or it's imported from there.\n */\nfunction isAngularDecorator(decorator: Decorator, isCore: boolean): boolean {\n  return isCore || (decorator.import !== null && decorator.import.from === '@angular/core');\n}\n\n/*\n #####################################################################\n  Code below has been extracted from the tsickle decorator downlevel transformer\n  and a few local modifications have been applied:\n\n    1. Tsickle by default processed all decorators that had the `@Annotation` JSDoc.\n       We modified the transform to only be concerned with known Angular decorators.\n    2. Tsickle by default added `@nocollapse` to all generated `ctorParameters` properties.\n       We only do this when `annotateForClosureCompiler` is enabled.\n    3. Tsickle does not handle union types for dependency injection. i.e. if a injected type\n       is denoted with `@Optional`, the actual type could be set to `T | null`.\n       See: https://github.com/angular/angular-cli/commit/826803d0736b807867caff9f8903e508970ad5e4.\n    4. Tsickle relied on `emitDecoratorMetadata` to be set to `true`. This is due to a limitation\n       in TypeScript transformers that never has been fixed. We were able to work around this\n       limitation so that `emitDecoratorMetadata` doesn't need to be specified.\n       See: `patchAliasReferenceResolution` for more details.\n\n  Here is a link to the tsickle revision on which this transformer is based:\n  https://github.com/angular/tsickle/blob/fae06becb1570f491806060d83f29f2d50c43cdd/src/decorator_downlevel_transformer.ts\n #####################################################################\n*/\n\nconst DECORATOR_INVOCATION_JSDOC_TYPE = '!Array<{type: !Function, args: (undefined|!Array<?>)}>';\n\n/**\n * Extracts the type of the decorator (the function or expression invoked), as well as all the\n * arguments passed to the decorator. Returns an AST with the form:\n *\n *     // For @decorator(arg1, arg2)\n *     { type: decorator, args: [arg1, arg2] }\n */\nfunction extractMetadataFromSingleDecorator(\n    decorator: ts.Decorator, diagnostics: ts.Diagnostic[]): ts.ObjectLiteralExpression {\n  const metadataProperties: ts.ObjectLiteralElementLike[] = [];\n  const expr = decorator.expression;\n  switch (expr.kind) {\n    case ts.SyntaxKind.Identifier:\n      // The decorator was a plain @Foo.\n      metadataProperties.push(ts.createPropertyAssignment('type', expr));\n      break;\n    case ts.SyntaxKind.CallExpression:\n      // The decorator was a call, like @Foo(bar).\n      const call = expr as ts.CallExpression;\n      metadataProperties.push(ts.createPropertyAssignment('type', call.expression));\n      if (call.arguments.length) {\n        const args: ts.Expression[] = [];\n        for (const arg of call.arguments) {\n          args.push(arg);\n        }\n        const argsArrayLiteral = ts.createArrayLiteral(args);\n        argsArrayLiteral.elements.hasTrailingComma = true;\n        metadataProperties.push(ts.createPropertyAssignment('args', argsArrayLiteral));\n      }\n      break;\n    default:\n      diagnostics.push({\n        file: decorator.getSourceFile(),\n        start: decorator.getStart(),\n        length: decorator.getEnd() - decorator.getStart(),\n        messageText:\n            `${ts.SyntaxKind[decorator.kind]} not implemented in gathering decorator metadata.`,\n        category: ts.DiagnosticCategory.Error,\n        code: 0,\n      });\n      break;\n  }\n  return ts.createObjectLiteral(metadataProperties);\n}\n\n/**\n * createCtorParametersClassProperty creates a static 'ctorParameters' property containing\n * downleveled decorator information.\n *\n * The property contains an arrow function that returns an array of object literals of the shape:\n *     static ctorParameters = () => [{\n *       type: SomeClass|undefined,  // the type of the param that's decorated, if it's a value.\n *       decorators: [{\n *         type: DecoratorFn,  // the type of the decorator that's invoked.\n *         args: [ARGS],       // the arguments passed to the decorator.\n *       }]\n *     }];\n */\nfunction createCtorParametersClassProperty(\n    diagnostics: ts.Diagnostic[],\n    entityNameToExpression: (n: ts.EntityName) => ts.Expression | undefined,\n    ctorParameters: ParameterDecorationInfo[],\n    isClosureCompilerEnabled: boolean): ts.PropertyDeclaration {\n  const params: ts.Expression[] = [];\n\n  for (const ctorParam of ctorParameters) {\n    if (!ctorParam.type && ctorParam.decorators.length === 0) {\n      params.push(ts.createNull());\n      continue;\n    }\n\n    const paramType = ctorParam.type ?\n        typeReferenceToExpression(entityNameToExpression, ctorParam.type) :\n        undefined;\n    const members =\n        [ts.createPropertyAssignment('type', paramType || ts.createIdentifier('undefined'))];\n\n    const decorators: ts.ObjectLiteralExpression[] = [];\n    for (const deco of ctorParam.decorators) {\n      decorators.push(extractMetadataFromSingleDecorator(deco, diagnostics));\n    }\n    if (decorators.length) {\n      members.push(ts.createPropertyAssignment('decorators', ts.createArrayLiteral(decorators)));\n    }\n    params.push(ts.createObjectLiteral(members));\n  }\n\n  const initializer = ts.createArrowFunction(\n      undefined, undefined, [], undefined, ts.createToken(ts.SyntaxKind.EqualsGreaterThanToken),\n      ts.createArrayLiteral(params, true));\n  const ctorProp = ts.createProperty(\n      undefined, [ts.createToken(ts.SyntaxKind.StaticKeyword)], 'ctorParameters', undefined,\n      undefined, initializer);\n  if (isClosureCompilerEnabled) {\n    ts.setSyntheticLeadingComments(ctorProp, [\n      {\n        kind: ts.SyntaxKind.MultiLineCommentTrivia,\n        text: [\n          `*`,\n          ` * @type {function(): !Array<(null|{`,\n          ` *   type: ?,`,\n          ` *   decorators: (undefined|${DECORATOR_INVOCATION_JSDOC_TYPE}),`,\n          ` * })>}`,\n          ` * @nocollapse`,\n          ` `,\n        ].join('\\n'),\n        pos: -1,\n        end: -1,\n        hasTrailingNewLine: true,\n      },\n    ]);\n  }\n  return ctorProp;\n}\n\n/**\n * Returns an expression representing the (potentially) value part for the given node.\n *\n * This is a partial re-implementation of TypeScript's serializeTypeReferenceNode. This is a\n * workaround for https://github.com/Microsoft/TypeScript/issues/17516 (serializeTypeReferenceNode\n * not being exposed). In practice this implementation is sufficient for Angular's use of type\n * metadata.\n */\nfunction typeReferenceToExpression(\n    entityNameToExpression: (n: ts.EntityName) => ts.Expression | undefined,\n    node: ts.TypeNode): ts.Expression|undefined {\n  let kind = node.kind;\n  if (ts.isLiteralTypeNode(node)) {\n    // Treat literal types like their base type (boolean, string, number).\n    kind = node.literal.kind;\n  }\n  switch (kind) {\n    case ts.SyntaxKind.FunctionType:\n    case ts.SyntaxKind.ConstructorType:\n      return ts.createIdentifier('Function');\n    case ts.SyntaxKind.ArrayType:\n    case ts.SyntaxKind.TupleType:\n      return ts.createIdentifier('Array');\n    case ts.SyntaxKind.TypePredicate:\n    case ts.SyntaxKind.TrueKeyword:\n    case ts.SyntaxKind.FalseKeyword:\n    case ts.SyntaxKind.BooleanKeyword:\n      return ts.createIdentifier('Boolean');\n    case ts.SyntaxKind.StringLiteral:\n    case ts.SyntaxKind.StringKeyword:\n      return ts.createIdentifier('String');\n    case ts.SyntaxKind.ObjectKeyword:\n      return ts.createIdentifier('Object');\n    case ts.SyntaxKind.NumberKeyword:\n    case ts.SyntaxKind.NumericLiteral:\n      return ts.createIdentifier('Number');\n    case ts.SyntaxKind.TypeReference:\n      const typeRef = node as ts.TypeReferenceNode;\n      // Ignore any generic types, just return the base type.\n      return entityNameToExpression(typeRef.typeName);\n    case ts.SyntaxKind.UnionType:\n      const childTypeNodes =\n          (node as ts.UnionTypeNode)\n              .types.filter(\n                  t => !(ts.isLiteralTypeNode(t) && t.literal.kind === ts.SyntaxKind.NullKeyword));\n      return childTypeNodes.length === 1 ?\n          typeReferenceToExpression(entityNameToExpression, childTypeNodes[0]) :\n          undefined;\n    default:\n      return undefined;\n  }\n}\n\n/**\n * Checks whether a given symbol refers to a value that exists at runtime (as distinct from a type).\n *\n * Expands aliases, which is important for the case where\n *   import * as x from 'some-module';\n * and x is now a value (the module object).\n */\nfunction symbolIsRuntimeValue(typeChecker: ts.TypeChecker, symbol: ts.Symbol): boolean {\n  if (symbol.flags & ts.SymbolFlags.Alias) {\n    symbol = typeChecker.getAliasedSymbol(symbol);\n  }\n\n  // Note that const enums are a special case, because\n  // while they have a value, they don't exist at runtime.\n  return (symbol.flags & ts.SymbolFlags.Value & ts.SymbolFlags.ConstEnumExcludes) !== 0;\n}\n\n/** ParameterDecorationInfo describes the information for a single constructor parameter. */\ninterface ParameterDecorationInfo {\n  /**\n   * The type declaration for the parameter. Only set if the type is a value (e.g. a class, not an\n   * interface).\n   */\n  type: ts.TypeNode|null;\n  /** The list of decorators found on the parameter, null if none. */\n  decorators: ts.Decorator[];\n}\n\n/**\n * Gets a transformer for downleveling Angular decorators.\n * @param typeChecker Reference to the program's type checker.\n * @param host Reflection host that is used for determining decorators.\n * @param diagnostics List which will be populated with diagnostics if any.\n * @param isCore Whether the current TypeScript program is for the `@angular/core` package.\n * @param isClosureCompilerEnabled Whether closure annotations need to be added where needed.\n * @param skipClassDecorators Whether class decorators should be skipped from downleveling.\n *   This is useful for JIT mode where class decorators should be preserved as they could rely\n *   on immediate execution. e.g. downleveling `@Injectable` means that the injectable factory\n *   is not created, and injecting the token will not work. If this decorator would not be\n *   downleveled, the `Injectable` decorator will execute immediately on file load, and\n *   Angular will generate the corresponding injectable factory.\n */\nexport function getDownlevelDecoratorsTransform(\n    typeChecker: ts.TypeChecker, host: ReflectionHost, diagnostics: ts.Diagnostic[],\n    isCore: boolean, isClosureCompilerEnabled: boolean,\n    skipClassDecorators: boolean): ts.TransformerFactory<ts.SourceFile> {\n  function addJSDocTypeAnnotation(node: ts.Node, jsdocType: string): void {\n    if (!isClosureCompilerEnabled) {\n      return;\n    }\n\n    ts.setSyntheticLeadingComments(node, [\n      {\n        kind: ts.SyntaxKind.MultiLineCommentTrivia,\n        text: `* @type {${jsdocType}} `,\n        pos: -1,\n        end: -1,\n        hasTrailingNewLine: true,\n      },\n    ]);\n  }\n\n  /**\n   * Takes a list of decorator metadata object ASTs and produces an AST for a\n   * static class property of an array of those metadata objects.\n   */\n  function createDecoratorClassProperty(decoratorList: ts.ObjectLiteralExpression[]) {\n    const modifier = ts.createToken(ts.SyntaxKind.StaticKeyword);\n    const initializer = ts.createArrayLiteral(decoratorList, true);\n    // NB: the .decorators property does not get a @nocollapse property. There\n    // is no good reason why - it means .decorators is not runtime accessible\n    // if you compile with collapse properties, whereas propDecorators is,\n    // which doesn't follow any stringent logic. However this has been the\n    // case previously, and adding it back in leads to substantial code size\n    // increases as Closure fails to tree shake these props\n    // without @nocollapse.\n    const prop =\n        ts.createProperty(undefined, [modifier], 'decorators', undefined, undefined, initializer);\n    addJSDocTypeAnnotation(prop, DECORATOR_INVOCATION_JSDOC_TYPE);\n    return prop;\n  }\n\n  /**\n   * createPropDecoratorsClassProperty creates a static 'propDecorators'\n   * property containing type information for every property that has a\n   * decorator applied.\n   *\n   *     static propDecorators: {[key: string]: {type: Function, args?:\n   * any[]}[]} = { propA: [{type: MyDecorator, args: [1, 2]}, ...],\n   *       ...\n   *     };\n   */\n  function createPropDecoratorsClassProperty(\n      diagnostics: ts.Diagnostic[],\n      properties: Map<string, ts.Decorator[]>): ts.PropertyDeclaration {\n    //  `static propDecorators: {[key: string]: ` + {type: Function, args?:\n    //  any[]}[] + `} = {\\n`);\n    const entries: ts.ObjectLiteralElementLike[] = [];\n    for (const [name, decorators] of properties.entries()) {\n      entries.push(ts.createPropertyAssignment(\n          name,\n          ts.createArrayLiteral(\n              decorators.map(deco => extractMetadataFromSingleDecorator(deco, diagnostics)))));\n    }\n    const initializer = ts.createObjectLiteral(entries, true);\n    const prop = ts.createProperty(\n        undefined, [ts.createToken(ts.SyntaxKind.StaticKeyword)], 'propDecorators', undefined,\n        undefined, initializer);\n    addJSDocTypeAnnotation(prop, `!Object<string, ${DECORATOR_INVOCATION_JSDOC_TYPE}>`);\n    return prop;\n  }\n\n  return (context: ts.TransformationContext) => {\n    // Ensure that referenced type symbols are not elided by TypeScript. Imports for\n    // such parameter type symbols previously could be type-only, but now might be also\n    // used in the `ctorParameters` static property as a value. We want to make sure\n    // that TypeScript does not elide imports for such type references. Read more\n    // about this in the description for `loadIsReferencedAliasDeclarationPatch`.\n    const referencedParameterTypes = loadIsReferencedAliasDeclarationPatch(context);\n\n    /**\n     * Converts an EntityName (from a type annotation) to an expression (accessing a value).\n     *\n     * For a given qualified name, this walks depth first to find the leftmost identifier,\n     * and then converts the path into a property access that can be used as expression.\n     */\n    function entityNameToExpression(name: ts.EntityName): ts.Expression|undefined {\n      const symbol = typeChecker.getSymbolAtLocation(name);\n      // Check if the entity name references a symbol that is an actual value. If it is not, it\n      // cannot be referenced by an expression, so return undefined.\n      if (!symbol || !symbolIsRuntimeValue(typeChecker, symbol) || !symbol.declarations ||\n          symbol.declarations.length === 0) {\n        return undefined;\n      }\n      // If we deal with a qualified name, build up a property access expression\n      // that could be used in the JavaScript output.\n      if (ts.isQualifiedName(name)) {\n        const containerExpr = entityNameToExpression(name.left);\n        if (containerExpr === undefined) {\n          return undefined;\n        }\n        return ts.createPropertyAccess(containerExpr, name.right);\n      }\n      const decl = symbol.declarations[0];\n      // If the given entity name has been resolved to an alias import declaration,\n      // ensure that the alias declaration is not elided by TypeScript, and use its\n      // name identifier to reference it at runtime.\n      if (isAliasImportDeclaration(decl)) {\n        referencedParameterTypes.add(decl);\n        // If the entity name resolves to an alias import declaration, we reference the\n        // entity based on the alias import name. This ensures that TypeScript properly\n        // resolves the link to the import. Cloning the original entity name identifier\n        // could lead to an incorrect resolution at local scope. e.g. Consider the following\n        // snippet: `constructor(Dep: Dep) {}`. In such a case, the local `Dep` identifier\n        // would resolve to the actual parameter name, and not to the desired import.\n        // This happens because the entity name identifier symbol is internally considered\n        // as type-only and therefore TypeScript tries to resolve it as value manually.\n        // We can help TypeScript and avoid this non-reliable resolution by using an identifier\n        // that is not type-only and is directly linked to the import alias declaration.\n        if (decl.name !== undefined) {\n          return ts.getMutableClone(decl.name);\n        }\n      }\n      // Clone the original entity name identifier so that it can be used to reference\n      // its value at runtime. This is used when the identifier is resolving to a file\n      // local declaration (otherwise it would resolve to an alias import declaration).\n      return ts.getMutableClone(name);\n    }\n\n    /**\n     * Transforms a class element. Returns a three tuple of name, transformed element, and\n     * decorators found. Returns an undefined name if there are no decorators to lower on the\n     * element, or the element has an exotic name.\n     */\n    function transformClassElement(element: ts.ClassElement):\n        [string|undefined, ts.ClassElement, ts.Decorator[]] {\n      element = ts.visitEachChild(element, decoratorDownlevelVisitor, context);\n      const decoratorsToKeep: ts.Decorator[] = [];\n      const toLower: ts.Decorator[] = [];\n      const decorators = host.getDecoratorsOfDeclaration(element) || [];\n      for (const decorator of decorators) {\n        // We only deal with concrete nodes in TypeScript sources, so we don't\n        // need to handle synthetically created decorators.\n        const decoratorNode = decorator.node! as ts.Decorator;\n        if (!isAngularDecorator(decorator, isCore)) {\n          decoratorsToKeep.push(decoratorNode);\n          continue;\n        }\n        toLower.push(decoratorNode);\n      }\n      if (!toLower.length) return [undefined, element, []];\n\n      if (!element.name || !ts.isIdentifier(element.name)) {\n        // Method has a weird name, e.g.\n        //   [Symbol.foo]() {...}\n        diagnostics.push({\n          file: element.getSourceFile(),\n          start: element.getStart(),\n          length: element.getEnd() - element.getStart(),\n          messageText: `Cannot process decorators for class element with non-analyzable name.`,\n          category: ts.DiagnosticCategory.Error,\n          code: 0,\n        });\n        return [undefined, element, []];\n      }\n\n      const name = (element.name as ts.Identifier).text;\n      const mutable = ts.getMutableClone(element);\n      (mutable as any).decorators = decoratorsToKeep.length ?\n          ts.setTextRange(ts.createNodeArray(decoratorsToKeep), mutable.decorators) :\n          undefined;\n      return [name, mutable, toLower];\n    }\n\n    /**\n     * Transforms a constructor. Returns the transformed constructor and the list of parameter\n     * information collected, consisting of decorators and optional type.\n     */\n    function transformConstructor(ctor: ts.ConstructorDeclaration):\n        [ts.ConstructorDeclaration, ParameterDecorationInfo[]] {\n      ctor = ts.visitEachChild(ctor, decoratorDownlevelVisitor, context);\n\n      const newParameters: ts.ParameterDeclaration[] = [];\n      const oldParameters =\n          ts.visitParameterList(ctor.parameters, decoratorDownlevelVisitor, context);\n      const parametersInfo: ParameterDecorationInfo[] = [];\n      for (const param of oldParameters) {\n        const decoratorsToKeep: ts.Decorator[] = [];\n        const paramInfo: ParameterDecorationInfo = {decorators: [], type: null};\n        const decorators = host.getDecoratorsOfDeclaration(param) || [];\n\n        for (const decorator of decorators) {\n          // We only deal with concrete nodes in TypeScript sources, so we don't\n          // need to handle synthetically created decorators.\n          const decoratorNode = decorator.node! as ts.Decorator;\n          if (!isAngularDecorator(decorator, isCore)) {\n            decoratorsToKeep.push(decoratorNode);\n            continue;\n          }\n          paramInfo!.decorators.push(decoratorNode);\n        }\n        if (param.type) {\n          // param has a type provided, e.g. \"foo: Bar\".\n          // The type will be emitted as a value expression in entityNameToExpression, which takes\n          // care not to emit anything for types that cannot be expressed as a value (e.g.\n          // interfaces).\n          paramInfo!.type = param.type;\n        }\n        parametersInfo.push(paramInfo);\n        const newParam = ts.updateParameter(\n            param,\n            // Must pass 'undefined' to avoid emitting decorator metadata.\n            decoratorsToKeep.length ? decoratorsToKeep : undefined, param.modifiers,\n            param.dotDotDotToken, param.name, param.questionToken, param.type, param.initializer);\n        newParameters.push(newParam);\n      }\n      const updated = ts.updateConstructor(\n          ctor, ctor.decorators, ctor.modifiers, newParameters,\n          ts.visitFunctionBody(ctor.body, decoratorDownlevelVisitor, context));\n      return [updated, parametersInfo];\n    }\n\n    /**\n     * Transforms a single class declaration:\n     * - dispatches to strip decorators on members\n     * - converts decorators on the class to annotations\n     * - creates a ctorParameters property\n     * - creates a propDecorators property\n     */\n    function transformClassDeclaration(classDecl: ts.ClassDeclaration): ts.ClassDeclaration {\n      classDecl = ts.getMutableClone(classDecl);\n\n      const newMembers: ts.ClassElement[] = [];\n      const decoratedProperties = new Map<string, ts.Decorator[]>();\n      let classParameters: ParameterDecorationInfo[]|null = null;\n\n      for (const member of classDecl.members) {\n        switch (member.kind) {\n          case ts.SyntaxKind.PropertyDeclaration:\n          case ts.SyntaxKind.GetAccessor:\n          case ts.SyntaxKind.SetAccessor:\n          case ts.SyntaxKind.MethodDeclaration: {\n            const [name, newMember, decorators] = transformClassElement(member);\n            newMembers.push(newMember);\n            if (name) decoratedProperties.set(name, decorators);\n            continue;\n          }\n          case ts.SyntaxKind.Constructor: {\n            const ctor = member as ts.ConstructorDeclaration;\n            if (!ctor.body) break;\n            const [newMember, parametersInfo] =\n                transformConstructor(member as ts.ConstructorDeclaration);\n            classParameters = parametersInfo;\n            newMembers.push(newMember);\n            continue;\n          }\n          default:\n            break;\n        }\n        newMembers.push(ts.visitEachChild(member, decoratorDownlevelVisitor, context));\n      }\n\n      // The `ReflectionHost.getDecoratorsOfDeclaration()` method will not return certain kinds of\n      // decorators that will never be Angular decorators. So we cannot rely on it to capture all\n      // the decorators that should be kept. Instead we start off with a set of the raw decorators\n      // on the class, and only remove the ones that have been identified for downleveling.\n      const decoratorsToKeep = new Set<ts.Decorator>(classDecl.decorators);\n      const possibleAngularDecorators = host.getDecoratorsOfDeclaration(classDecl) || [];\n\n      let hasAngularDecorator = false;\n      const decoratorsToLower = [];\n      for (const decorator of possibleAngularDecorators) {\n        // We only deal with concrete nodes in TypeScript sources, so we don't\n        // need to handle synthetically created decorators.\n        const decoratorNode = decorator.node! as ts.Decorator;\n        const isNgDecorator = isAngularDecorator(decorator, isCore);\n\n        // Keep track if we come across an Angular class decorator. This is used\n        // for to determine whether constructor parameters should be captured or not.\n        if (isNgDecorator) {\n          hasAngularDecorator = true;\n        }\n\n        if (isNgDecorator && !skipClassDecorators) {\n          decoratorsToLower.push(extractMetadataFromSingleDecorator(decoratorNode, diagnostics));\n          decoratorsToKeep.delete(decoratorNode);\n        }\n      }\n\n      if (decoratorsToLower.length) {\n        newMembers.push(createDecoratorClassProperty(decoratorsToLower));\n      }\n      if (classParameters) {\n        if (hasAngularDecorator || classParameters.some(p => !!p.decorators.length)) {\n          // Capture constructor parameters if the class has Angular decorator applied,\n          // or if any of the parameters has decorators applied directly.\n          newMembers.push(createCtorParametersClassProperty(\n              diagnostics, entityNameToExpression, classParameters, isClosureCompilerEnabled));\n        }\n      }\n      if (decoratedProperties.size) {\n        newMembers.push(createPropDecoratorsClassProperty(diagnostics, decoratedProperties));\n      }\n\n      const members = ts.setTextRange(\n          ts.createNodeArray(newMembers, classDecl.members.hasTrailingComma), classDecl.members);\n\n      return ts.updateClassDeclaration(\n          classDecl, decoratorsToKeep.size ? Array.from(decoratorsToKeep) : undefined,\n          classDecl.modifiers, classDecl.name, classDecl.typeParameters, classDecl.heritageClauses,\n          members);\n    }\n\n    /**\n     * Transformer visitor that looks for Angular decorators and replaces them with\n     * downleveled static properties. Also collects constructor type metadata for\n     * class declaration that are decorated with an Angular decorator.\n     */\n    function decoratorDownlevelVisitor(node: ts.Node): ts.Node {\n      if (ts.isClassDeclaration(node)) {\n        return transformClassDeclaration(node);\n      }\n      return ts.visitEachChild(node, decoratorDownlevelVisitor, context);\n    }\n\n    return (sf: ts.SourceFile) => {\n      // Downlevel decorators and constructor parameter types. We will keep track of all\n      // referenced constructor parameter types so that we can instruct TypeScript to\n      // not elide their imports if they previously were only type-only.\n      return ts.visitEachChild(sf, decoratorDownlevelVisitor, context);\n    };\n  };\n}\n"]}