@angular/compiler-cli/src/transformers/lower_expressions.js

/**
 * @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/lower_expressions", ["require", "exports", "tslib", "@angular/compiler", "typescript", "@angular/compiler-cli/src/metadata/index"], factory);
    }
})(function (require, exports) {
    "use strict";
    Object.defineProperty(exports, "__esModule", { value: true });
    exports.LowerMetadataTransform = exports.getExpressionLoweringTransformFactory = void 0;
    var tslib_1 = require("tslib");
    var compiler_1 = require("@angular/compiler");
    var ts = require("typescript");
    var index_1 = require("@angular/compiler-cli/src/metadata/index");
    function toMap(items, select) {
        return new Map(items.map(function (i) { return [select(i), i]; }));
    }
    // We will never lower expressions in a nested lexical scope so avoid entering them.
    // This also avoids a bug in TypeScript 2.3 where the lexical scopes get out of sync
    // when using visitEachChild.
    function isLexicalScope(node) {
        switch (node.kind) {
            case ts.SyntaxKind.ArrowFunction:
            case ts.SyntaxKind.FunctionExpression:
            case ts.SyntaxKind.FunctionDeclaration:
            case ts.SyntaxKind.ClassExpression:
            case ts.SyntaxKind.ClassDeclaration:
            case ts.SyntaxKind.FunctionType:
            case ts.SyntaxKind.TypeLiteral:
            case ts.SyntaxKind.ArrayType:
                return true;
        }
        return false;
    }
    function transformSourceFile(sourceFile, requests, context) {
        var inserts = [];
        // Calculate the range of interesting locations. The transform will only visit nodes in this
        // range to improve the performance on large files.
        var locations = Array.from(requests.keys());
        var min = Math.min.apply(Math, tslib_1.__spreadArray([], tslib_1.__read(locations)));
        var max = Math.max.apply(Math, tslib_1.__spreadArray([], tslib_1.__read(locations)));
        // Visit nodes matching the request and synthetic nodes added by tsickle
        function shouldVisit(pos, end) {
            return (pos <= max && end >= min) || pos == -1;
        }
        function visitSourceFile(sourceFile) {
            function topLevelStatement(node) {
                var declarations = [];
                function visitNode(node) {
                    // Get the original node before tsickle
                    var _a = ts.getOriginalNode(node), pos = _a.pos, end = _a.end, kind = _a.kind, originalParent = _a.parent;
                    var nodeRequest = requests.get(pos);
                    if (nodeRequest && nodeRequest.kind == kind && nodeRequest.end == end) {
                        // This node is requested to be rewritten as a reference to the exported name.
                        if (originalParent && originalParent.kind === ts.SyntaxKind.VariableDeclaration) {
                            // As the value represents the whole initializer of a variable declaration,
                            // just refer to that variable. This e.g. helps to preserve closure comments
                            // at the right place.
                            var varParent = originalParent;
                            if (varParent.name.kind === ts.SyntaxKind.Identifier) {
                                var varName = varParent.name.text;
                                var exportName_1 = nodeRequest.name;
                                declarations.push({
                                    name: exportName_1,
                                    node: ts.createIdentifier(varName),
                                    order: 1 /* AfterStmt */
                                });
                                return node;
                            }
                        }
                        // Record that the node needs to be moved to an exported variable with the given name
                        var exportName = nodeRequest.name;
                        declarations.push({ name: exportName, node: node, order: 0 /* BeforeStmt */ });
                        return ts.createIdentifier(exportName);
                    }
                    var result = node;
                    if (shouldVisit(pos, end) && !isLexicalScope(node)) {
                        result = ts.visitEachChild(node, visitNode, context);
                    }
                    return result;
                }
                // Get the original node before tsickle
                var _a = ts.getOriginalNode(node), pos = _a.pos, end = _a.end;
                var resultStmt;
                if (shouldVisit(pos, end)) {
                    resultStmt = ts.visitEachChild(node, visitNode, context);
                }
                else {
                    resultStmt = node;
                }
                if (declarations.length) {
                    inserts.push({ relativeTo: resultStmt, declarations: declarations });
                }
                return resultStmt;
            }
            var newStatements = sourceFile.statements.map(topLevelStatement);
            if (inserts.length) {
                // Insert the declarations relative to the rewritten statement that references them.
                var insertMap_1 = toMap(inserts, function (i) { return i.relativeTo; });
                var tmpStatements_1 = [];
                newStatements.forEach(function (statement) {
                    var insert = insertMap_1.get(statement);
                    if (insert) {
                        var before = insert.declarations.filter(function (d) { return d.order === 0 /* BeforeStmt */; });
                        if (before.length) {
                            tmpStatements_1.push(createVariableStatementForDeclarations(before));
                        }
                        tmpStatements_1.push(statement);
                        var after = insert.declarations.filter(function (d) { return d.order === 1 /* AfterStmt */; });
                        if (after.length) {
                            tmpStatements_1.push(createVariableStatementForDeclarations(after));
                        }
                    }
                    else {
                        tmpStatements_1.push(statement);
                    }
                });
                // Insert an exports clause to export the declarations
                tmpStatements_1.push(ts.createExportDeclaration(
                /* decorators */ undefined, 
                /* modifiers */ undefined, ts.createNamedExports(inserts
                    .reduce(function (accumulator, insert) { return tslib_1.__spreadArray(tslib_1.__spreadArray([], tslib_1.__read(accumulator)), tslib_1.__read(insert.declarations)); }, [])
                    .map(function (declaration) { return ts.createExportSpecifier(
                /* propertyName */ undefined, declaration.name); }))));
                newStatements = tmpStatements_1;
            }
            var newSf = ts.updateSourceFileNode(sourceFile, ts.setTextRange(ts.createNodeArray(newStatements), sourceFile.statements));
            if (!(sourceFile.flags & ts.NodeFlags.Synthesized)) {
                newSf.flags &= ~ts.NodeFlags.Synthesized;
            }
            return newSf;
        }
        return visitSourceFile(sourceFile);
    }
    function createVariableStatementForDeclarations(declarations) {
        var varDecls = declarations.map(function (i) { return ts.createVariableDeclaration(i.name, /* type */ undefined, i.node); });
        return ts.createVariableStatement(
        /* modifiers */ undefined, ts.createVariableDeclarationList(varDecls, ts.NodeFlags.Const));
    }
    function getExpressionLoweringTransformFactory(requestsMap, program) {
        // Return the factory
        return function (context) { return function (sourceFile) {
            // We need to use the original SourceFile for reading metadata, and not the transformed one.
            var originalFile = program.getSourceFile(sourceFile.fileName);
            if (originalFile) {
                var requests = requestsMap.getRequests(originalFile);
                if (requests && requests.size) {
                    return transformSourceFile(sourceFile, requests, context);
                }
            }
            return sourceFile;
        }; };
    }
    exports.getExpressionLoweringTransformFactory = getExpressionLoweringTransformFactory;
    function isEligibleForLowering(node) {
        if (node) {
            switch (node.kind) {
                case ts.SyntaxKind.SourceFile:
                case ts.SyntaxKind.Decorator:
                    // Lower expressions that are local to the module scope or
                    // in a decorator.
                    return true;
                case ts.SyntaxKind.ClassDeclaration:
                case ts.SyntaxKind.InterfaceDeclaration:
                case ts.SyntaxKind.EnumDeclaration:
                case ts.SyntaxKind.FunctionDeclaration:
                    // Don't lower expressions in a declaration.
                    return false;
                case ts.SyntaxKind.VariableDeclaration:
                    var isExported = (ts.getCombinedModifierFlags(node) &
                        ts.ModifierFlags.Export) == 0;
                    // This might be unnecessary, as the variable might be exported and only used as a reference
                    // in another expression. However, the variable also might be involved in provider
                    // definitions. If that's the case, there is a specific token (`ROUTES`) which the compiler
                    // attempts to understand deeply. Sub-expressions within that token (`loadChildren` for
                    // example) might also require lowering even if the top-level declaration is already
                    // properly exported.
                    var varNode = node;
                    return isExported ||
                        (varNode.initializer !== undefined &&
                            (ts.isObjectLiteralExpression(varNode.initializer) ||
                                ts.isArrayLiteralExpression(varNode.initializer) ||
                                ts.isCallExpression(varNode.initializer)));
            }
            return isEligibleForLowering(node.parent);
        }
        return true;
    }
    function isPrimitive(value) {
        return Object(value) !== value;
    }
    function isRewritten(value) {
        return index_1.isMetadataGlobalReferenceExpression(value) && compiler_1.isLoweredSymbol(value.name);
    }
    function isLiteralFieldNamed(node, names) {
        if (node.parent && node.parent.kind == ts.SyntaxKind.PropertyAssignment) {
            var property = node.parent;
            if (property.parent && property.parent.kind == ts.SyntaxKind.ObjectLiteralExpression &&
                property.name && property.name.kind == ts.SyntaxKind.Identifier) {
                var propertyName = property.name;
                return names.has(propertyName.text);
            }
        }
        return false;
    }
    var LowerMetadataTransform = /** @class */ (function () {
        function LowerMetadataTransform(lowerableFieldNames) {
            this.requests = new Map();
            this.lowerableFieldNames = new Set(lowerableFieldNames);
        }
        // RequestMap
        LowerMetadataTransform.prototype.getRequests = function (sourceFile) {
            var result = this.requests.get(sourceFile.fileName);
            if (!result) {
                // Force the metadata for this source file to be collected which
                // will recursively call start() populating the request map;
                this.cache.getMetadata(sourceFile);
                // If we still don't have the requested metadata, the file is not a module
                // or is a declaration file so return an empty map.
                result = this.requests.get(sourceFile.fileName) || new Map();
            }
            return result;
        };
        // MetadataTransformer
        LowerMetadataTransform.prototype.connect = function (cache) {
            this.cache = cache;
        };
        LowerMetadataTransform.prototype.start = function (sourceFile) {
            var _this = this;
            var identNumber = 0;
            var freshIdent = function () { return compiler_1.createLoweredSymbol(identNumber++); };
            var requests = new Map();
            this.requests.set(sourceFile.fileName, requests);
            var replaceNode = function (node) {
                var name = freshIdent();
                requests.set(node.pos, { name: name, kind: node.kind, location: node.pos, end: node.end });
                return { __symbolic: 'reference', name: name };
            };
            var isExportedSymbol = (function () {
                var exportTable;
                return function (node) {
                    if (node.kind == ts.SyntaxKind.Identifier) {
                        var ident = node;
                        if (!exportTable) {
                            exportTable = createExportTableFor(sourceFile);
                        }
                        return exportTable.has(ident.text);
                    }
                    return false;
                };
            })();
            var isExportedPropertyAccess = function (node) {
                if (node.kind === ts.SyntaxKind.PropertyAccessExpression) {
                    var pae = node;
                    if (isExportedSymbol(pae.expression)) {
                        return true;
                    }
                }
                return false;
            };
            var hasLowerableParentCache = new Map();
            var shouldBeLowered = function (node) {
                if (node === undefined) {
                    return false;
                }
                var lowerable = false;
                if ((node.kind === ts.SyntaxKind.ArrowFunction ||
                    node.kind === ts.SyntaxKind.FunctionExpression) &&
                    isEligibleForLowering(node)) {
                    lowerable = true;
                }
                else if (isLiteralFieldNamed(node, _this.lowerableFieldNames) && isEligibleForLowering(node) &&
                    !isExportedSymbol(node) && !isExportedPropertyAccess(node)) {
                    lowerable = true;
                }
                return lowerable;
            };
            var hasLowerableParent = function (node) {
                if (node === undefined) {
                    return false;
                }
                if (!hasLowerableParentCache.has(node)) {
                    hasLowerableParentCache.set(node, shouldBeLowered(node.parent) || hasLowerableParent(node.parent));
                }
                return hasLowerableParentCache.get(node);
            };
            var isLowerable = function (node) {
                if (node === undefined) {
                    return false;
                }
                return shouldBeLowered(node) && !hasLowerableParent(node);
            };
            return function (value, node) {
                if (!isPrimitive(value) && !isRewritten(value) && isLowerable(node)) {
                    return replaceNode(node);
                }
                return value;
            };
        };
        return LowerMetadataTransform;
    }());
    exports.LowerMetadataTransform = LowerMetadataTransform;
    function createExportTableFor(sourceFile) {
        var exportTable = new Set();
        // Lazily collect all the exports from the source file
        ts.forEachChild(sourceFile, function scan(node) {
            var e_1, _a;
            switch (node.kind) {
                case ts.SyntaxKind.ClassDeclaration:
                case ts.SyntaxKind.FunctionDeclaration:
                case ts.SyntaxKind.InterfaceDeclaration:
                    if ((ts.getCombinedModifierFlags(node) & ts.ModifierFlags.Export) != 0) {
                        var classDeclaration = node;
                        var name = classDeclaration.name;
                        if (name)
                            exportTable.add(name.text);
                    }
                    break;
                case ts.SyntaxKind.VariableStatement:
                    var variableStatement = node;
                    try {
                        for (var _b = tslib_1.__values(variableStatement.declarationList.declarations), _c = _b.next(); !_c.done; _c = _b.next()) {
                            var declaration = _c.value;
                            scan(declaration);
                        }
                    }
                    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; }
                    }
                    break;
                case ts.SyntaxKind.VariableDeclaration:
                    var variableDeclaration = node;
                    if ((ts.getCombinedModifierFlags(variableDeclaration) & ts.ModifierFlags.Export) != 0 &&
                        variableDeclaration.name.kind == ts.SyntaxKind.Identifier) {
                        var name = variableDeclaration.name;
                        exportTable.add(name.text);
                    }
                    break;
                case ts.SyntaxKind.ExportDeclaration:
                    var exportDeclaration = node;
                    var moduleSpecifier = exportDeclaration.moduleSpecifier, exportClause = exportDeclaration.exportClause;
                    if (!moduleSpecifier && exportClause && ts.isNamedExports(exportClause)) {
                        exportClause.elements.forEach(function (spec) {
                            exportTable.add(spec.name.text);
                        });
                    }
            }
        });
        return exportTable;
    }
});
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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 {createLoweredSymbol, isLoweredSymbol} from '@angular/compiler';\nimport * as ts from 'typescript';\n\nimport {CollectorOptions, isMetadataGlobalReferenceExpression, MetadataCollector, MetadataValue, ModuleMetadata} from '../metadata/index';\n\nimport {MetadataCache, MetadataTransformer, ValueTransform} from './metadata_cache';\n\nexport interface LoweringRequest {\n  kind: ts.SyntaxKind;\n  location: number;\n  end: number;\n  name: string;\n}\n\nexport type RequestLocationMap = Map<number, LoweringRequest>;\n\nconst enum DeclarationOrder {\n  BeforeStmt,\n  AfterStmt\n}\n\ninterface Declaration {\n  name: string;\n  node: ts.Node;\n  order: DeclarationOrder;\n}\n\ninterface DeclarationInsert {\n  declarations: Declaration[];\n  relativeTo: ts.Node;\n}\n\nfunction toMap<T, K>(items: T[], select: (item: T) => K): Map<K, T> {\n  return new Map(items.map<[K, T]>(i => [select(i), i]));\n}\n\n// We will never lower expressions in a nested lexical scope so avoid entering them.\n// This also avoids a bug in TypeScript 2.3 where the lexical scopes get out of sync\n// when using visitEachChild.\nfunction isLexicalScope(node: ts.Node): boolean {\n  switch (node.kind) {\n    case ts.SyntaxKind.ArrowFunction:\n    case ts.SyntaxKind.FunctionExpression:\n    case ts.SyntaxKind.FunctionDeclaration:\n    case ts.SyntaxKind.ClassExpression:\n    case ts.SyntaxKind.ClassDeclaration:\n    case ts.SyntaxKind.FunctionType:\n    case ts.SyntaxKind.TypeLiteral:\n    case ts.SyntaxKind.ArrayType:\n      return true;\n  }\n  return false;\n}\n\nfunction transformSourceFile(\n    sourceFile: ts.SourceFile, requests: RequestLocationMap,\n    context: ts.TransformationContext): ts.SourceFile {\n  const inserts: DeclarationInsert[] = [];\n\n  // Calculate the range of interesting locations. The transform will only visit nodes in this\n  // range to improve the performance on large files.\n  const locations = Array.from(requests.keys());\n  const min = Math.min(...locations);\n  const max = Math.max(...locations);\n\n  // Visit nodes matching the request and synthetic nodes added by tsickle\n  function shouldVisit(pos: number, end: number): boolean {\n    return (pos <= max && end >= min) || pos == -1;\n  }\n\n  function visitSourceFile(sourceFile: ts.SourceFile): ts.SourceFile {\n    function topLevelStatement(node: ts.Statement): ts.Statement {\n      const declarations: Declaration[] = [];\n\n      function visitNode(node: ts.Node): ts.Node {\n        // Get the original node before tsickle\n        const {pos, end, kind, parent: originalParent} = ts.getOriginalNode(node);\n        const nodeRequest = requests.get(pos);\n        if (nodeRequest && nodeRequest.kind == kind && nodeRequest.end == end) {\n          // This node is requested to be rewritten as a reference to the exported name.\n          if (originalParent && originalParent.kind === ts.SyntaxKind.VariableDeclaration) {\n            // As the value represents the whole initializer of a variable declaration,\n            // just refer to that variable. This e.g. helps to preserve closure comments\n            // at the right place.\n            const varParent = originalParent as ts.VariableDeclaration;\n            if (varParent.name.kind === ts.SyntaxKind.Identifier) {\n              const varName = varParent.name.text;\n              const exportName = nodeRequest.name;\n              declarations.push({\n                name: exportName,\n                node: ts.createIdentifier(varName),\n                order: DeclarationOrder.AfterStmt\n              });\n              return node;\n            }\n          }\n          // Record that the node needs to be moved to an exported variable with the given name\n          const exportName = nodeRequest.name;\n          declarations.push({name: exportName, node, order: DeclarationOrder.BeforeStmt});\n          return ts.createIdentifier(exportName);\n        }\n        let result = node;\n        if (shouldVisit(pos, end) && !isLexicalScope(node)) {\n          result = ts.visitEachChild(node, visitNode, context);\n        }\n        return result;\n      }\n\n      // Get the original node before tsickle\n      const {pos, end} = ts.getOriginalNode(node);\n      let resultStmt: ts.Statement;\n      if (shouldVisit(pos, end)) {\n        resultStmt = ts.visitEachChild(node, visitNode, context);\n      } else {\n        resultStmt = node;\n      }\n\n      if (declarations.length) {\n        inserts.push({relativeTo: resultStmt, declarations});\n      }\n      return resultStmt;\n    }\n\n    let newStatements = sourceFile.statements.map(topLevelStatement);\n\n    if (inserts.length) {\n      // Insert the declarations relative to the rewritten statement that references them.\n      const insertMap = toMap(inserts, i => i.relativeTo);\n      const tmpStatements: ts.Statement[] = [];\n      newStatements.forEach(statement => {\n        const insert = insertMap.get(statement);\n        if (insert) {\n          const before = insert.declarations.filter(d => d.order === DeclarationOrder.BeforeStmt);\n          if (before.length) {\n            tmpStatements.push(createVariableStatementForDeclarations(before));\n          }\n          tmpStatements.push(statement);\n          const after = insert.declarations.filter(d => d.order === DeclarationOrder.AfterStmt);\n          if (after.length) {\n            tmpStatements.push(createVariableStatementForDeclarations(after));\n          }\n        } else {\n          tmpStatements.push(statement);\n        }\n      });\n\n      // Insert an exports clause to export the declarations\n      tmpStatements.push(ts.createExportDeclaration(\n          /* decorators */ undefined,\n          /* modifiers */ undefined,\n          ts.createNamedExports(\n              inserts\n                  .reduce(\n                      (accumulator, insert) => [...accumulator, ...insert.declarations],\n                      [] as Declaration[])\n                  .map(\n                      declaration => ts.createExportSpecifier(\n                          /* propertyName */ undefined, declaration.name)))));\n\n      newStatements = tmpStatements;\n    }\n\n    const newSf = ts.updateSourceFileNode(\n        sourceFile, ts.setTextRange(ts.createNodeArray(newStatements), sourceFile.statements));\n    if (!(sourceFile.flags & ts.NodeFlags.Synthesized)) {\n      (newSf.flags as ts.NodeFlags) &= ~ts.NodeFlags.Synthesized;\n    }\n\n    return newSf;\n  }\n\n  return visitSourceFile(sourceFile);\n}\n\nfunction createVariableStatementForDeclarations(declarations: Declaration[]): ts.VariableStatement {\n  const varDecls = declarations.map(\n      i => ts.createVariableDeclaration(i.name, /* type */ undefined, i.node as ts.Expression));\n  return ts.createVariableStatement(\n      /* modifiers */ undefined, ts.createVariableDeclarationList(varDecls, ts.NodeFlags.Const));\n}\n\nexport function getExpressionLoweringTransformFactory(\n    requestsMap: RequestsMap, program: ts.Program): (context: ts.TransformationContext) =>\n    (sourceFile: ts.SourceFile) => ts.SourceFile {\n  // Return the factory\n  return (context: ts.TransformationContext) => (sourceFile: ts.SourceFile): ts.SourceFile => {\n    // We need to use the original SourceFile for reading metadata, and not the transformed one.\n    const originalFile = program.getSourceFile(sourceFile.fileName);\n    if (originalFile) {\n      const requests = requestsMap.getRequests(originalFile);\n      if (requests && requests.size) {\n        return transformSourceFile(sourceFile, requests, context);\n      }\n    }\n    return sourceFile;\n  };\n}\n\nexport interface RequestsMap {\n  getRequests(sourceFile: ts.SourceFile): RequestLocationMap;\n}\n\nfunction isEligibleForLowering(node: ts.Node|undefined): boolean {\n  if (node) {\n    switch (node.kind) {\n      case ts.SyntaxKind.SourceFile:\n      case ts.SyntaxKind.Decorator:\n        // Lower expressions that are local to the module scope or\n        // in a decorator.\n        return true;\n      case ts.SyntaxKind.ClassDeclaration:\n      case ts.SyntaxKind.InterfaceDeclaration:\n      case ts.SyntaxKind.EnumDeclaration:\n      case ts.SyntaxKind.FunctionDeclaration:\n        // Don't lower expressions in a declaration.\n        return false;\n      case ts.SyntaxKind.VariableDeclaration:\n        const isExported = (ts.getCombinedModifierFlags(node as ts.VariableDeclaration) &\n                            ts.ModifierFlags.Export) == 0;\n        // This might be unnecessary, as the variable might be exported and only used as a reference\n        // in another expression. However, the variable also might be involved in provider\n        // definitions. If that's the case, there is a specific token (`ROUTES`) which the compiler\n        // attempts to understand deeply. Sub-expressions within that token (`loadChildren` for\n        // example) might also require lowering even if the top-level declaration is already\n        // properly exported.\n        const varNode = node as ts.VariableDeclaration;\n        return isExported ||\n            (varNode.initializer !== undefined &&\n             (ts.isObjectLiteralExpression(varNode.initializer) ||\n              ts.isArrayLiteralExpression(varNode.initializer) ||\n              ts.isCallExpression(varNode.initializer)));\n    }\n    return isEligibleForLowering(node.parent);\n  }\n  return true;\n}\n\nfunction isPrimitive(value: any): boolean {\n  return Object(value) !== value;\n}\n\nfunction isRewritten(value: any): boolean {\n  return isMetadataGlobalReferenceExpression(value) && isLoweredSymbol(value.name);\n}\n\nfunction isLiteralFieldNamed(node: ts.Node, names: Set<string>): boolean {\n  if (node.parent && node.parent.kind == ts.SyntaxKind.PropertyAssignment) {\n    const property = node.parent as ts.PropertyAssignment;\n    if (property.parent && property.parent.kind == ts.SyntaxKind.ObjectLiteralExpression &&\n        property.name && property.name.kind == ts.SyntaxKind.Identifier) {\n      const propertyName = property.name as ts.Identifier;\n      return names.has(propertyName.text);\n    }\n  }\n  return false;\n}\n\nexport class LowerMetadataTransform implements RequestsMap, MetadataTransformer {\n  // TODO(issue/24571): remove '!'.\n  private cache!: MetadataCache;\n  private requests = new Map<string, RequestLocationMap>();\n  private lowerableFieldNames: Set<string>;\n\n  constructor(lowerableFieldNames: string[]) {\n    this.lowerableFieldNames = new Set<string>(lowerableFieldNames);\n  }\n\n  // RequestMap\n  getRequests(sourceFile: ts.SourceFile): RequestLocationMap {\n    let result = this.requests.get(sourceFile.fileName);\n    if (!result) {\n      // Force the metadata for this source file to be collected which\n      // will recursively call start() populating the request map;\n      this.cache.getMetadata(sourceFile);\n\n      // If we still don't have the requested metadata, the file is not a module\n      // or is a declaration file so return an empty map.\n      result = this.requests.get(sourceFile.fileName) || new Map<number, LoweringRequest>();\n    }\n    return result;\n  }\n\n  // MetadataTransformer\n  connect(cache: MetadataCache): void {\n    this.cache = cache;\n  }\n\n  start(sourceFile: ts.SourceFile): ValueTransform|undefined {\n    let identNumber = 0;\n    const freshIdent = () => createLoweredSymbol(identNumber++);\n    const requests = new Map<number, LoweringRequest>();\n    this.requests.set(sourceFile.fileName, requests);\n\n    const replaceNode = (node: ts.Node) => {\n      const name = freshIdent();\n      requests.set(node.pos, {name, kind: node.kind, location: node.pos, end: node.end});\n      return {__symbolic: 'reference', name};\n    };\n\n    const isExportedSymbol = (() => {\n      let exportTable: Set<string>;\n      return (node: ts.Node) => {\n        if (node.kind == ts.SyntaxKind.Identifier) {\n          const ident = node as ts.Identifier;\n\n          if (!exportTable) {\n            exportTable = createExportTableFor(sourceFile);\n          }\n          return exportTable.has(ident.text);\n        }\n        return false;\n      };\n    })();\n\n    const isExportedPropertyAccess = (node: ts.Node) => {\n      if (node.kind === ts.SyntaxKind.PropertyAccessExpression) {\n        const pae = node as ts.PropertyAccessExpression;\n        if (isExportedSymbol(pae.expression)) {\n          return true;\n        }\n      }\n      return false;\n    };\n\n    const hasLowerableParentCache = new Map<ts.Node, boolean>();\n\n    const shouldBeLowered = (node: ts.Node|undefined): boolean => {\n      if (node === undefined) {\n        return false;\n      }\n      let lowerable: boolean = false;\n      if ((node.kind === ts.SyntaxKind.ArrowFunction ||\n           node.kind === ts.SyntaxKind.FunctionExpression) &&\n          isEligibleForLowering(node)) {\n        lowerable = true;\n      } else if (\n          isLiteralFieldNamed(node, this.lowerableFieldNames) && isEligibleForLowering(node) &&\n          !isExportedSymbol(node) && !isExportedPropertyAccess(node)) {\n        lowerable = true;\n      }\n      return lowerable;\n    };\n\n    const hasLowerableParent = (node: ts.Node|undefined): boolean => {\n      if (node === undefined) {\n        return false;\n      }\n      if (!hasLowerableParentCache.has(node)) {\n        hasLowerableParentCache.set(\n            node, shouldBeLowered(node.parent) || hasLowerableParent(node.parent));\n      }\n      return hasLowerableParentCache.get(node)!;\n    };\n\n    const isLowerable = (node: ts.Node|undefined): boolean => {\n      if (node === undefined) {\n        return false;\n      }\n      return shouldBeLowered(node) && !hasLowerableParent(node);\n    };\n\n    return (value: MetadataValue, node: ts.Node): MetadataValue => {\n      if (!isPrimitive(value) && !isRewritten(value) && isLowerable(node)) {\n        return replaceNode(node);\n      }\n      return value;\n    };\n  }\n}\n\nfunction createExportTableFor(sourceFile: ts.SourceFile): Set<string> {\n  const exportTable = new Set<string>();\n  // Lazily collect all the exports from the source file\n  ts.forEachChild(sourceFile, function scan(node) {\n    switch (node.kind) {\n      case ts.SyntaxKind.ClassDeclaration:\n      case ts.SyntaxKind.FunctionDeclaration:\n      case ts.SyntaxKind.InterfaceDeclaration:\n        if ((ts.getCombinedModifierFlags(node as ts.Declaration) & ts.ModifierFlags.Export) != 0) {\n          const classDeclaration =\n              node as (ts.ClassDeclaration | ts.FunctionDeclaration | ts.InterfaceDeclaration);\n          const name = classDeclaration.name;\n          if (name) exportTable.add(name.text);\n        }\n        break;\n      case ts.SyntaxKind.VariableStatement:\n        const variableStatement = node as ts.VariableStatement;\n        for (const declaration of variableStatement.declarationList.declarations) {\n          scan(declaration);\n        }\n        break;\n      case ts.SyntaxKind.VariableDeclaration:\n        const variableDeclaration = node as ts.VariableDeclaration;\n        if ((ts.getCombinedModifierFlags(variableDeclaration) & ts.ModifierFlags.Export) != 0 &&\n            variableDeclaration.name.kind == ts.SyntaxKind.Identifier) {\n          const name = variableDeclaration.name as ts.Identifier;\n          exportTable.add(name.text);\n        }\n        break;\n      case ts.SyntaxKind.ExportDeclaration:\n        const exportDeclaration = node as ts.ExportDeclaration;\n        const {moduleSpecifier, exportClause} = exportDeclaration;\n        if (!moduleSpecifier && exportClause && ts.isNamedExports(exportClause)) {\n          exportClause.elements.forEach(spec => {\n            exportTable.add(spec.name.text);\n          });\n        }\n    }\n  });\n  return exportTable;\n}\n"]}