blob: 8c0893eeea941dceec0e799e050df863f8b524d5 [file] [log] [blame]
/**
* @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/core/schematics/migrations/static-queries/strategies/usage_strategy/declaration_usage_visitor", ["require", "exports", "typescript", "@angular/core/schematics/utils/typescript/functions", "@angular/core/schematics/utils/typescript/property_name"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.DeclarationUsageVisitor = exports.ResolvedUsage = void 0;
const ts = require("typescript");
const functions_1 = require("@angular/core/schematics/utils/typescript/functions");
const property_name_1 = require("@angular/core/schematics/utils/typescript/property_name");
var ResolvedUsage;
(function (ResolvedUsage) {
ResolvedUsage[ResolvedUsage["SYNCHRONOUS"] = 0] = "SYNCHRONOUS";
ResolvedUsage[ResolvedUsage["ASYNCHRONOUS"] = 1] = "ASYNCHRONOUS";
ResolvedUsage[ResolvedUsage["AMBIGUOUS"] = 2] = "AMBIGUOUS";
})(ResolvedUsage = exports.ResolvedUsage || (exports.ResolvedUsage = {}));
/**
* List of TypeScript syntax tokens that can be used within a binary expression as
* compound assignment. These imply a read and write of the left-side expression.
*/
const BINARY_COMPOUND_TOKENS = [
ts.SyntaxKind.CaretEqualsToken,
ts.SyntaxKind.AsteriskEqualsToken,
ts.SyntaxKind.AmpersandEqualsToken,
ts.SyntaxKind.BarEqualsToken,
ts.SyntaxKind.AsteriskAsteriskEqualsToken,
ts.SyntaxKind.PlusEqualsToken,
ts.SyntaxKind.MinusEqualsToken,
ts.SyntaxKind.SlashEqualsToken,
];
/**
* List of known asynchronous external call expressions which aren't analyzable
* but are guaranteed to not execute the passed argument synchronously.
*/
const ASYNC_EXTERNAL_CALLS = [
{ parent: ['Promise'], name: 'then' },
{ parent: ['Promise'], name: 'catch' },
{ parent: [null, 'Window'], name: 'requestAnimationFrame' },
{ parent: [null, 'Window'], name: 'setTimeout' },
{ parent: [null, 'Window'], name: 'setInterval' },
{ parent: ['*'], name: 'addEventListener' },
];
/**
* Class that can be used to determine if a given TypeScript node is used within
* other given TypeScript nodes. This is achieved by walking through all children
* of the given node and checking for usages of the given declaration. The visitor
* also handles potential control flow changes caused by call/new expressions.
*/
class DeclarationUsageVisitor {
constructor(declaration, typeChecker, baseContext = new Map()) {
this.declaration = declaration;
this.typeChecker = typeChecker;
this.baseContext = baseContext;
/** Set of visited symbols that caused a jump in control flow. */
this.visitedJumpExprNodes = new Set();
/**
* Queue of nodes that need to be checked for declaration usage and
* are guaranteed to be executed synchronously.
*/
this.nodeQueue = [];
/**
* Nodes which need to be checked for declaration usage but aren't
* guaranteed to execute synchronously.
*/
this.ambiguousNodeQueue = [];
/**
* Function context that holds the TypeScript node values for all parameters
* of the currently analyzed function block.
*/
this.context = new Map();
}
isReferringToSymbol(node) {
const symbol = this.typeChecker.getSymbolAtLocation(node);
return !!symbol && symbol.valueDeclaration === this.declaration;
}
addJumpExpressionToQueue(callExpression) {
const node = functions_1.unwrapExpression(callExpression.expression);
// In case the given expression is already referring to a function-like declaration,
// we don't need to resolve the symbol of the expression as the jump expression is
// defined inline and we can just add the given node to the queue.
if (functions_1.isFunctionLikeDeclaration(node) && node.body) {
this.nodeQueue.push(node.body);
return;
}
const callExprSymbol = this._getDeclarationSymbolOfNode(node);
if (!callExprSymbol || !callExprSymbol.valueDeclaration) {
this.peekIntoJumpExpression(callExpression);
return;
}
const expressionDecl = this._resolveNodeFromContext(callExprSymbol.valueDeclaration);
// Note that we should not add previously visited symbols to the queue as
// this could cause cycles.
if (!functions_1.isFunctionLikeDeclaration(expressionDecl) ||
this.visitedJumpExprNodes.has(expressionDecl) || !expressionDecl.body) {
this.peekIntoJumpExpression(callExpression);
return;
}
// Update the context for the new jump expression and its specified arguments.
this._updateContext(callExpression.arguments, expressionDecl.parameters);
this.visitedJumpExprNodes.add(expressionDecl);
this.nodeQueue.push(expressionDecl.body);
}
addNewExpressionToQueue(node) {
const newExprSymbol = this._getDeclarationSymbolOfNode(functions_1.unwrapExpression(node.expression));
// Only handle new expressions which resolve to classes. Technically "new" could
// also call void functions or objects with a constructor signature. Also note that
// we should not visit already visited symbols as this could cause cycles.
if (!newExprSymbol || !newExprSymbol.valueDeclaration ||
!ts.isClassDeclaration(newExprSymbol.valueDeclaration)) {
this.peekIntoJumpExpression(node);
return;
}
const targetConstructor = newExprSymbol.valueDeclaration.members.find(ts.isConstructorDeclaration);
if (targetConstructor && targetConstructor.body &&
!this.visitedJumpExprNodes.has(targetConstructor)) {
// Update the context for the new expression and its specified constructor
// parameters if arguments are passed to the class constructor.
if (node.arguments) {
this._updateContext(node.arguments, targetConstructor.parameters);
}
this.visitedJumpExprNodes.add(targetConstructor);
this.nodeQueue.push(targetConstructor.body);
}
else {
this.peekIntoJumpExpression(node);
}
}
visitPropertyAccessors(node, checkSetter, checkGetter) {
const propertySymbol = this._getPropertyAccessSymbol(node);
if (!propertySymbol || !propertySymbol.declarations.length ||
(propertySymbol.getFlags() & ts.SymbolFlags.Accessor) === 0) {
return;
}
// Since we checked the symbol flags and the symbol is describing an accessor, the
// declarations are guaranteed to only contain the getters and setters.
const accessors = propertySymbol.declarations;
accessors
.filter(d => (checkSetter && ts.isSetAccessor(d) || checkGetter && ts.isGetAccessor(d)) &&
d.body && !this.visitedJumpExprNodes.has(d))
.forEach(d => {
this.visitedJumpExprNodes.add(d);
this.nodeQueue.push(d.body);
});
}
visitBinaryExpression(node) {
const leftExpr = functions_1.unwrapExpression(node.left);
if (!ts.isPropertyAccessExpression(leftExpr)) {
return false;
}
if (BINARY_COMPOUND_TOKENS.indexOf(node.operatorToken.kind) !== -1) {
// Compound assignments always cause the getter and setter to be called.
// Therefore we need to check the setter and getter of the property access.
this.visitPropertyAccessors(leftExpr, /* setter */ true, /* getter */ true);
}
else if (node.operatorToken.kind === ts.SyntaxKind.EqualsToken) {
// Value assignments using the equals token only cause the "setter" to be called.
// Therefore we need to analyze the setter declaration of the property access.
this.visitPropertyAccessors(leftExpr, /* setter */ true, /* getter */ false);
}
else {
// If the binary expression is not an assignment, it's a simple property read and
// we need to check the getter declaration if present.
this.visitPropertyAccessors(leftExpr, /* setter */ false, /* getter */ true);
}
return true;
}
getResolvedNodeUsage(searchNode) {
this.nodeQueue = [searchNode];
this.visitedJumpExprNodes.clear();
this.context.clear();
// Copy base context values into the current function block context. The
// base context is useful if nodes need to be mapped to other nodes. e.g.
// abstract super class methods are mapped to their implementation node of
// the derived class.
this.baseContext.forEach((value, key) => this.context.set(key, value));
return this.isSynchronouslyUsedInNode(searchNode);
}
isSynchronouslyUsedInNode(searchNode) {
this.ambiguousNodeQueue = [];
while (this.nodeQueue.length) {
const node = this.nodeQueue.shift();
if (ts.isIdentifier(node) && this.isReferringToSymbol(node)) {
return ResolvedUsage.SYNCHRONOUS;
}
// Handle call expressions within TypeScript nodes that cause a jump in control
// flow. We resolve the call expression value declaration and add it to the node queue.
if (ts.isCallExpression(node)) {
this.addJumpExpressionToQueue(node);
}
// Handle new expressions that cause a jump in control flow. We resolve the
// constructor declaration of the target class and add it to the node queue.
if (ts.isNewExpression(node)) {
this.addNewExpressionToQueue(node);
}
// We also need to handle binary expressions where a value can be either assigned to
// the property, or a value is read from a property expression. Depending on the
// binary expression operator, setters or getters need to be analyzed.
if (ts.isBinaryExpression(node)) {
// In case the binary expression contained a property expression on the left side, we
// don't want to continue visiting this property expression on its own. This is necessary
// because visiting the expression on its own causes a loss of context. e.g. property
// access expressions *do not* always cause a value read (e.g. property assignments)
if (this.visitBinaryExpression(node)) {
this.nodeQueue.push(node.right);
continue;
}
}
// Handle property access expressions. Property expressions which are part of binary
// expressions won't be added to the node queue, so these access expressions are
// guaranteed to be "read" accesses and we need to check the "getter" declaration.
if (ts.isPropertyAccessExpression(node)) {
this.visitPropertyAccessors(node, /* setter */ false, /* getter */ true);
}
// Do not visit nodes that declare a block of statements but are not executed
// synchronously (e.g. function declarations). We only want to check TypeScript
// nodes which are synchronously executed in the control flow.
if (!functions_1.isFunctionLikeDeclaration(node)) {
this.nodeQueue.push(...node.getChildren());
}
}
if (this.ambiguousNodeQueue.length) {
// Update the node queue to all stored ambiguous nodes. These nodes are not
// guaranteed to be executed and therefore in case of a synchronous usage
// within one of those nodes, the resolved usage is ambiguous.
this.nodeQueue = this.ambiguousNodeQueue;
const usage = this.isSynchronouslyUsedInNode(searchNode);
return usage === ResolvedUsage.SYNCHRONOUS ? ResolvedUsage.AMBIGUOUS : usage;
}
return ResolvedUsage.ASYNCHRONOUS;
}
/**
* Peeks into the given jump expression by adding all function like declarations
* which are referenced in the jump expression arguments to the ambiguous node
* queue. These arguments could technically access the given declaration but it's
* not guaranteed that the jump expression is executed. In that case the resolved
* usage is ambiguous.
*/
peekIntoJumpExpression(jumpExp) {
if (!jumpExp.arguments) {
return;
}
// For some call expressions we don't want to add the arguments to the
// ambiguous node queue. e.g. "setTimeout" is not analyzable but is
// guaranteed to execute its argument asynchronously. We handle a subset
// of these call expressions by having a hardcoded list of some.
if (ts.isCallExpression(jumpExp)) {
const symbol = this._getDeclarationSymbolOfNode(jumpExp.expression);
if (symbol && symbol.valueDeclaration) {
const parentNode = symbol.valueDeclaration.parent;
if (parentNode && (ts.isInterfaceDeclaration(parentNode) || ts.isSourceFile(parentNode)) &&
(ts.isMethodSignature(symbol.valueDeclaration) ||
ts.isFunctionDeclaration(symbol.valueDeclaration)) &&
symbol.valueDeclaration.name) {
const parentName = ts.isInterfaceDeclaration(parentNode) ? parentNode.name.text : null;
const callName = property_name_1.getPropertyNameText(symbol.valueDeclaration.name);
if (ASYNC_EXTERNAL_CALLS.some(c => (c.name === callName &&
(c.parent.indexOf(parentName) !== -1 || c.parent.indexOf('*') !== -1)))) {
return;
}
}
}
}
jumpExp.arguments.forEach((node) => {
node = this._resolveDeclarationOfNode(node);
if (ts.isVariableDeclaration(node) && node.initializer) {
node = node.initializer;
}
if (functions_1.isFunctionLikeDeclaration(node) && !!node.body) {
this.ambiguousNodeQueue.push(node.body);
}
});
}
/**
* Resolves a given node from the context. In case the node is not mapped in
* the context, the original node is returned.
*/
_resolveNodeFromContext(node) {
if (this.context.has(node)) {
return this.context.get(node);
}
return node;
}
/**
* Updates the context to reflect the newly set parameter values. This allows future
* references to function parameters to be resolved to the actual node through the context.
*/
_updateContext(callArgs, parameters) {
parameters.forEach((parameter, index) => {
let argumentNode = callArgs[index];
if (!argumentNode) {
if (!parameter.initializer) {
return;
}
// Argument can be undefined in case the function parameter has a default
// value. In that case we want to store the parameter default value in the context.
argumentNode = parameter.initializer;
}
if (ts.isIdentifier(argumentNode)) {
this.context.set(parameter, this._resolveDeclarationOfNode(argumentNode));
}
else {
this.context.set(parameter, argumentNode);
}
});
}
/**
* Resolves the declaration of a given TypeScript node. For example an identifier can
* refer to a function parameter. This parameter can then be resolved through the
* function context.
*/
_resolveDeclarationOfNode(node) {
const symbol = this._getDeclarationSymbolOfNode(node);
if (!symbol || !symbol.valueDeclaration) {
return node;
}
return this._resolveNodeFromContext(symbol.valueDeclaration);
}
/**
* Gets the declaration symbol of a given TypeScript node. Resolves aliased
* symbols to the symbol containing the value declaration.
*/
_getDeclarationSymbolOfNode(node) {
let symbol = this.typeChecker.getSymbolAtLocation(node);
if (!symbol) {
return null;
}
// Resolve the symbol to it's original declaration symbol.
while (symbol.flags & ts.SymbolFlags.Alias) {
symbol = this.typeChecker.getAliasedSymbol(symbol);
}
return symbol;
}
/** Gets the symbol of the given property access expression. */
_getPropertyAccessSymbol(node) {
let propertySymbol = this._getDeclarationSymbolOfNode(node.name);
if (!propertySymbol || !propertySymbol.valueDeclaration) {
return null;
}
if (!this.context.has(propertySymbol.valueDeclaration)) {
return propertySymbol;
}
// In case the context has the value declaration of the given property access
// name identifier, we need to replace the "propertySymbol" with the symbol
// referring to the resolved symbol based on the context. e.g. abstract properties
// can ultimately resolve into an accessor declaration based on the implementation.
const contextNode = this._resolveNodeFromContext(propertySymbol.valueDeclaration);
if (!ts.isAccessor(contextNode)) {
return null;
}
// Resolve the symbol referring to the "accessor" using the name identifier
// of the accessor declaration.
return this._getDeclarationSymbolOfNode(contextNode.name);
}
}
exports.DeclarationUsageVisitor = DeclarationUsageVisitor;
});
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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 {isFunctionLikeDeclaration, unwrapExpression} from '../../../../utils/typescript/functions';\nimport {getPropertyNameText} from '../../../../utils/typescript/property_name';\n\nexport type FunctionContext = Map<ts.Node, ts.Node>;\n\nexport enum ResolvedUsage {\n  SYNCHRONOUS,\n  ASYNCHRONOUS,\n  AMBIGUOUS,\n}\n\n/**\n * List of TypeScript syntax tokens that can be used within a binary expression as\n * compound assignment. These imply a read and write of the left-side expression.\n */\nconst BINARY_COMPOUND_TOKENS = [\n  ts.SyntaxKind.CaretEqualsToken,\n  ts.SyntaxKind.AsteriskEqualsToken,\n  ts.SyntaxKind.AmpersandEqualsToken,\n  ts.SyntaxKind.BarEqualsToken,\n  ts.SyntaxKind.AsteriskAsteriskEqualsToken,\n  ts.SyntaxKind.PlusEqualsToken,\n  ts.SyntaxKind.MinusEqualsToken,\n  ts.SyntaxKind.SlashEqualsToken,\n];\n\n/**\n * List of known asynchronous external call expressions which aren't analyzable\n * but are guaranteed to not execute the passed argument synchronously.\n */\nconst ASYNC_EXTERNAL_CALLS = [\n  {parent: ['Promise'], name: 'then'},\n  {parent: ['Promise'], name: 'catch'},\n  {parent: [null, 'Window'], name: 'requestAnimationFrame'},\n  {parent: [null, 'Window'], name: 'setTimeout'},\n  {parent: [null, 'Window'], name: 'setInterval'},\n  {parent: ['*'], name: 'addEventListener'},\n];\n\n/**\n * Class that can be used to determine if a given TypeScript node is used within\n * other given TypeScript nodes. This is achieved by walking through all children\n * of the given node and checking for usages of the given declaration. The visitor\n * also handles potential control flow changes caused by call/new expressions.\n */\nexport class DeclarationUsageVisitor {\n  /** Set of visited symbols that caused a jump in control flow. */\n  private visitedJumpExprNodes = new Set<ts.Node>();\n\n  /**\n   * Queue of nodes that need to be checked for declaration usage and\n   * are guaranteed to be executed synchronously.\n   */\n  private nodeQueue: ts.Node[] = [];\n\n  /**\n   * Nodes which need to be checked for declaration usage but aren't\n   * guaranteed to execute synchronously.\n   */\n  private ambiguousNodeQueue: ts.Node[] = [];\n\n  /**\n   * Function context that holds the TypeScript node values for all parameters\n   * of the currently analyzed function block.\n   */\n  private context: FunctionContext = new Map();\n\n  constructor(\n      private declaration: ts.Node, private typeChecker: ts.TypeChecker,\n      private baseContext: FunctionContext = new Map()) {}\n\n  private isReferringToSymbol(node: ts.Node): boolean {\n    const symbol = this.typeChecker.getSymbolAtLocation(node);\n    return !!symbol && symbol.valueDeclaration === this.declaration;\n  }\n\n  private addJumpExpressionToQueue(callExpression: ts.CallExpression) {\n    const node = unwrapExpression(callExpression.expression);\n\n    // In case the given expression is already referring to a function-like declaration,\n    // we don't need to resolve the symbol of the expression as the jump expression is\n    // defined inline and we can just add the given node to the queue.\n    if (isFunctionLikeDeclaration(node) && node.body) {\n      this.nodeQueue.push(node.body);\n      return;\n    }\n\n    const callExprSymbol = this._getDeclarationSymbolOfNode(node);\n\n    if (!callExprSymbol || !callExprSymbol.valueDeclaration) {\n      this.peekIntoJumpExpression(callExpression);\n      return;\n    }\n\n    const expressionDecl = this._resolveNodeFromContext(callExprSymbol.valueDeclaration);\n\n    // Note that we should not add previously visited symbols to the queue as\n    // this could cause cycles.\n    if (!isFunctionLikeDeclaration(expressionDecl) ||\n        this.visitedJumpExprNodes.has(expressionDecl) || !expressionDecl.body) {\n      this.peekIntoJumpExpression(callExpression);\n      return;\n    }\n\n    // Update the context for the new jump expression and its specified arguments.\n    this._updateContext(callExpression.arguments, expressionDecl.parameters);\n\n    this.visitedJumpExprNodes.add(expressionDecl);\n    this.nodeQueue.push(expressionDecl.body);\n  }\n\n  private addNewExpressionToQueue(node: ts.NewExpression) {\n    const newExprSymbol = this._getDeclarationSymbolOfNode(unwrapExpression(node.expression));\n\n    // Only handle new expressions which resolve to classes. Technically \"new\" could\n    // also call void functions or objects with a constructor signature. Also note that\n    // we should not visit already visited symbols as this could cause cycles.\n    if (!newExprSymbol || !newExprSymbol.valueDeclaration ||\n        !ts.isClassDeclaration(newExprSymbol.valueDeclaration)) {\n      this.peekIntoJumpExpression(node);\n      return;\n    }\n\n    const targetConstructor =\n        newExprSymbol.valueDeclaration.members.find(ts.isConstructorDeclaration);\n\n    if (targetConstructor && targetConstructor.body &&\n        !this.visitedJumpExprNodes.has(targetConstructor)) {\n      // Update the context for the new expression and its specified constructor\n      // parameters if arguments are passed to the class constructor.\n      if (node.arguments) {\n        this._updateContext(node.arguments, targetConstructor.parameters);\n      }\n\n      this.visitedJumpExprNodes.add(targetConstructor);\n      this.nodeQueue.push(targetConstructor.body);\n    } else {\n      this.peekIntoJumpExpression(node);\n    }\n  }\n\n  private visitPropertyAccessors(\n      node: ts.PropertyAccessExpression, checkSetter: boolean, checkGetter: boolean) {\n    const propertySymbol = this._getPropertyAccessSymbol(node);\n\n    if (!propertySymbol || !propertySymbol.declarations.length ||\n        (propertySymbol.getFlags() & ts.SymbolFlags.Accessor) === 0) {\n      return;\n    }\n\n    // Since we checked the symbol flags and the symbol is describing an accessor, the\n    // declarations are guaranteed to only contain the getters and setters.\n    const accessors = propertySymbol.declarations as ts.AccessorDeclaration[];\n\n    accessors\n        .filter(\n            d => (checkSetter && ts.isSetAccessor(d) || checkGetter && ts.isGetAccessor(d)) &&\n                d.body && !this.visitedJumpExprNodes.has(d))\n        .forEach(d => {\n          this.visitedJumpExprNodes.add(d);\n          this.nodeQueue.push(d.body!);\n        });\n  }\n\n  private visitBinaryExpression(node: ts.BinaryExpression): boolean {\n    const leftExpr = unwrapExpression(node.left);\n\n    if (!ts.isPropertyAccessExpression(leftExpr)) {\n      return false;\n    }\n\n    if (BINARY_COMPOUND_TOKENS.indexOf(node.operatorToken.kind) !== -1) {\n      // Compound assignments always cause the getter and setter to be called.\n      // Therefore we need to check the setter and getter of the property access.\n      this.visitPropertyAccessors(leftExpr, /* setter */ true, /* getter */ true);\n    } else if (node.operatorToken.kind === ts.SyntaxKind.EqualsToken) {\n      // Value assignments using the equals token only cause the \"setter\" to be called.\n      // Therefore we need to analyze the setter declaration of the property access.\n      this.visitPropertyAccessors(leftExpr, /* setter */ true, /* getter */ false);\n    } else {\n      // If the binary expression is not an assignment, it's a simple property read and\n      // we need to check the getter declaration if present.\n      this.visitPropertyAccessors(leftExpr, /* setter */ false, /* getter */ true);\n    }\n    return true;\n  }\n\n  getResolvedNodeUsage(searchNode: ts.Node): ResolvedUsage {\n    this.nodeQueue = [searchNode];\n    this.visitedJumpExprNodes.clear();\n    this.context.clear();\n\n    // Copy base context values into the current function block context. The\n    // base context is useful if nodes need to be mapped to other nodes. e.g.\n    // abstract super class methods are mapped to their implementation node of\n    // the derived class.\n    this.baseContext.forEach((value, key) => this.context.set(key, value));\n\n    return this.isSynchronouslyUsedInNode(searchNode);\n  }\n\n  private isSynchronouslyUsedInNode(searchNode: ts.Node): ResolvedUsage {\n    this.ambiguousNodeQueue = [];\n\n    while (this.nodeQueue.length) {\n      const node = this.nodeQueue.shift()!;\n\n      if (ts.isIdentifier(node) && this.isReferringToSymbol(node)) {\n        return ResolvedUsage.SYNCHRONOUS;\n      }\n\n      // Handle call expressions within TypeScript nodes that cause a jump in control\n      // flow. We resolve the call expression value declaration and add it to the node queue.\n      if (ts.isCallExpression(node)) {\n        this.addJumpExpressionToQueue(node);\n      }\n\n      // Handle new expressions that cause a jump in control flow. We resolve the\n      // constructor declaration of the target class and add it to the node queue.\n      if (ts.isNewExpression(node)) {\n        this.addNewExpressionToQueue(node);\n      }\n\n      // We also need to handle binary expressions where a value can be either assigned to\n      // the property, or a value is read from a property expression. Depending on the\n      // binary expression operator, setters or getters need to be analyzed.\n      if (ts.isBinaryExpression(node)) {\n        // In case the binary expression contained a property expression on the left side, we\n        // don't want to continue visiting this property expression on its own. This is necessary\n        // because visiting the expression on its own causes a loss of context. e.g. property\n        // access expressions *do not* always cause a value read (e.g. property assignments)\n        if (this.visitBinaryExpression(node)) {\n          this.nodeQueue.push(node.right);\n          continue;\n        }\n      }\n\n      // Handle property access expressions. Property expressions which are part of binary\n      // expressions won't be added to the node queue, so these access expressions are\n      // guaranteed to be \"read\" accesses and we need to check the \"getter\" declaration.\n      if (ts.isPropertyAccessExpression(node)) {\n        this.visitPropertyAccessors(node, /* setter */ false, /* getter */ true);\n      }\n\n      // Do not visit nodes that declare a block of statements but are not executed\n      // synchronously (e.g. function declarations). We only want to check TypeScript\n      // nodes which are synchronously executed in the control flow.\n      if (!isFunctionLikeDeclaration(node)) {\n        this.nodeQueue.push(...node.getChildren());\n      }\n    }\n\n    if (this.ambiguousNodeQueue.length) {\n      // Update the node queue to all stored ambiguous nodes. These nodes are not\n      // guaranteed to be executed and therefore in case of a synchronous usage\n      // within one of those nodes, the resolved usage is ambiguous.\n      this.nodeQueue = this.ambiguousNodeQueue;\n      const usage = this.isSynchronouslyUsedInNode(searchNode);\n      return usage === ResolvedUsage.SYNCHRONOUS ? ResolvedUsage.AMBIGUOUS : usage;\n    }\n    return ResolvedUsage.ASYNCHRONOUS;\n  }\n\n  /**\n   * Peeks into the given jump expression by adding all function like declarations\n   * which are referenced in the jump expression arguments to the ambiguous node\n   * queue. These arguments could technically access the given declaration but it's\n   * not guaranteed that the jump expression is executed. In that case the resolved\n   * usage is ambiguous.\n   */\n  private peekIntoJumpExpression(jumpExp: ts.CallExpression|ts.NewExpression) {\n    if (!jumpExp.arguments) {\n      return;\n    }\n\n    // For some call expressions we don't want to add the arguments to the\n    // ambiguous node queue. e.g. \"setTimeout\" is not analyzable but is\n    // guaranteed to execute its argument asynchronously. We handle a subset\n    // of these call expressions by having a hardcoded list of some.\n    if (ts.isCallExpression(jumpExp)) {\n      const symbol = this._getDeclarationSymbolOfNode(jumpExp.expression);\n      if (symbol && symbol.valueDeclaration) {\n        const parentNode = symbol.valueDeclaration.parent;\n        if (parentNode && (ts.isInterfaceDeclaration(parentNode) || ts.isSourceFile(parentNode)) &&\n            (ts.isMethodSignature(symbol.valueDeclaration) ||\n             ts.isFunctionDeclaration(symbol.valueDeclaration)) &&\n            symbol.valueDeclaration.name) {\n          const parentName = ts.isInterfaceDeclaration(parentNode) ? parentNode.name.text : null;\n          const callName = getPropertyNameText(symbol.valueDeclaration.name);\n          if (ASYNC_EXTERNAL_CALLS.some(\n                  c =>\n                      (c.name === callName &&\n                       (c.parent.indexOf(parentName) !== -1 || c.parent.indexOf('*') !== -1)))) {\n            return;\n          }\n        }\n      }\n    }\n\n    jumpExp.arguments!.forEach((node: ts.Node) => {\n      node = this._resolveDeclarationOfNode(node);\n\n      if (ts.isVariableDeclaration(node) && node.initializer) {\n        node = node.initializer;\n      }\n\n      if (isFunctionLikeDeclaration(node) && !!node.body) {\n        this.ambiguousNodeQueue.push(node.body);\n      }\n    });\n  }\n\n  /**\n   * Resolves a given node from the context. In case the node is not mapped in\n   * the context, the original node is returned.\n   */\n  private _resolveNodeFromContext(node: ts.Node): ts.Node {\n    if (this.context.has(node)) {\n      return this.context.get(node)!;\n    }\n    return node;\n  }\n\n  /**\n   * Updates the context to reflect the newly set parameter values. This allows future\n   * references to function parameters to be resolved to the actual node through the context.\n   */\n  private _updateContext(\n      callArgs: ts.NodeArray<ts.Expression>, parameters: ts.NodeArray<ts.ParameterDeclaration>) {\n    parameters.forEach((parameter, index) => {\n      let argumentNode: ts.Node = callArgs[index];\n\n      if (!argumentNode) {\n        if (!parameter.initializer) {\n          return;\n        }\n\n        // Argument can be undefined in case the function parameter has a default\n        // value. In that case we want to store the parameter default value in the context.\n        argumentNode = parameter.initializer;\n      }\n\n      if (ts.isIdentifier(argumentNode)) {\n        this.context.set(parameter, this._resolveDeclarationOfNode(argumentNode));\n      } else {\n        this.context.set(parameter, argumentNode);\n      }\n    });\n  }\n\n  /**\n   * Resolves the declaration of a given TypeScript node. For example an identifier can\n   * refer to a function parameter. This parameter can then be resolved through the\n   * function context.\n   */\n  private _resolveDeclarationOfNode(node: ts.Node): ts.Node {\n    const symbol = this._getDeclarationSymbolOfNode(node);\n\n    if (!symbol || !symbol.valueDeclaration) {\n      return node;\n    }\n\n    return this._resolveNodeFromContext(symbol.valueDeclaration);\n  }\n\n  /**\n   * Gets the declaration symbol of a given TypeScript node. Resolves aliased\n   * symbols to the symbol containing the value declaration.\n   */\n  private _getDeclarationSymbolOfNode(node: ts.Node): ts.Symbol|null {\n    let symbol = this.typeChecker.getSymbolAtLocation(node);\n\n    if (!symbol) {\n      return null;\n    }\n\n    // Resolve the symbol to it's original declaration symbol.\n    while (symbol.flags & ts.SymbolFlags.Alias) {\n      symbol = this.typeChecker.getAliasedSymbol(symbol);\n    }\n\n    return symbol;\n  }\n\n  /** Gets the symbol of the given property access expression. */\n  private _getPropertyAccessSymbol(node: ts.PropertyAccessExpression): ts.Symbol|null {\n    let propertySymbol = this._getDeclarationSymbolOfNode(node.name);\n\n    if (!propertySymbol || !propertySymbol.valueDeclaration) {\n      return null;\n    }\n\n    if (!this.context.has(propertySymbol.valueDeclaration)) {\n      return propertySymbol;\n    }\n\n    // In case the context has the value declaration of the given property access\n    // name identifier, we need to replace the \"propertySymbol\" with the symbol\n    // referring to the resolved symbol based on the context. e.g. abstract properties\n    // can ultimately resolve into an accessor declaration based on the implementation.\n    const contextNode = this._resolveNodeFromContext(propertySymbol.valueDeclaration);\n\n    if (!ts.isAccessor(contextNode)) {\n      return null;\n    }\n\n    // Resolve the symbol referring to the \"accessor\" using the name identifier\n    // of the accessor declaration.\n    return this._getDeclarationSymbolOfNode(contextNode.name);\n  }\n}\n"]}