constructs
Version:
A programming model for software-defined state
453 lines • 49 kB
JavaScript
"use strict";
var _a, _b;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ConstructOrder = exports.Construct = exports.Node = void 0;
const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
const dependency_1 = require("./dependency");
const stack_trace_1 = require("./private/stack-trace");
const uniqueid_1 = require("./private/uniqueid");
const CONSTRUCT_SYM = Symbol.for('constructs.Construct');
/**
* Represents the construct node in the scope tree.
*/
class Node {
/**
* Returns the node associated with a construct.
* @param construct the construct
*
* @deprecated use `construct.node` instead
*/
static of(construct) {
return construct.node;
}
constructor(host, scope, id) {
this.host = host;
this._locked = false; // if this is "true", addChild will fail
this._children = {};
this._context = {};
this._metadata = new Array();
this._dependencies = new Set();
this._validations = new Array();
id = id ?? ''; // if undefined, convert to empty string
this.id = sanitizeId(id);
this.scope = scope;
if (scope && !this.id) {
throw new Error('Only root constructs may have an empty ID');
}
// add to parent scope
scope?.node.addChild(host, this.id);
}
/**
* The full, absolute path of this construct in the tree.
*
* Components are separated by '/'.
*/
get path() {
const components = this.scopes.filter(c => c.node.id).map(c => c.node.id);
return components.join(Node.PATH_SEP);
}
/**
* Returns an opaque tree-unique address for this construct.
*
* Addresses are 42 characters hexadecimal strings. They begin with "c8"
* followed by 40 lowercase hexadecimal characters (0-9a-f).
*
* Addresses are calculated using a SHA-1 of the components of the construct
* path.
*
* To enable refactorings of construct trees, constructs with the ID `Default`
* will be excluded from the calculation. In those cases constructs in the
* same tree may have the same addreess.
*
* @example c83a2846e506bcc5f10682b564084bca2d275709ee
*/
get addr() {
if (!this._addr) {
this._addr = (0, uniqueid_1.addressOf)(this.scopes.map(c => c.node.id));
}
return this._addr;
}
/**
* Return a direct child by id, or undefined
*
* @param id Identifier of direct child
* @returns the child if found, or undefined
*/
tryFindChild(id) {
return this._children[sanitizeId(id)];
}
/**
* Return a direct child by id
*
* Throws an error if the child is not found.
*
* @param id Identifier of direct child
* @returns Child with the given id.
*/
findChild(id) {
const ret = this.tryFindChild(id);
if (!ret) {
throw new Error(`No child with id: '${id}'`);
}
return ret;
}
/**
* Returns the child construct that has the id `Default` or `Resource"`.
* This is usually the construct that provides the bulk of the underlying functionality.
* Useful for modifications of the underlying construct that are not available at the higher levels.
*
* @throws if there is more than one child
* @returns a construct or undefined if there is no default child
*/
get defaultChild() {
if (this._defaultChild !== undefined) {
return this._defaultChild;
}
const resourceChild = this.tryFindChild('Resource');
const defaultChild = this.tryFindChild('Default');
if (resourceChild && defaultChild) {
throw new Error(`Cannot determine default child for ${this.path}. There is both a child with id "Resource" and id "Default"`);
}
return defaultChild || resourceChild;
}
/**
* Override the defaultChild property.
*
* This should only be used in the cases where the correct
* default child is not named 'Resource' or 'Default' as it
* should be.
*
* If you set this to undefined, the default behavior of finding
* the child named 'Resource' or 'Default' will be used.
*/
set defaultChild(value) {
this._defaultChild = value;
}
/**
* All direct children of this construct.
*/
get children() {
return Object.values(this._children);
}
/**
* Return this construct and all of its children in the given order
*/
findAll(order = ConstructOrder.PREORDER) {
const ret = new Array();
visit(this.host);
return ret;
function visit(c) {
if (order === ConstructOrder.PREORDER) {
ret.push(c);
}
for (const child of c.node.children) {
visit(child);
}
if (order === ConstructOrder.POSTORDER) {
ret.push(c);
}
}
}
/**
* This can be used to set contextual values.
* Context must be set before any children are added, since children may consult context info during construction.
* If the key already exists, it will be overridden.
* @param key The context key
* @param value The context value
*/
setContext(key, value) {
if (this.children.length > 0) {
const names = this.children.map(c => c.node.id);
throw new Error('Cannot set context after children have been added: ' + names.join(','));
}
this._context[key] = value;
}
/**
* Retrieves a value from tree context if present. Otherwise, would throw an error.
*
* Context is usually initialized at the root, but can be overridden at any point in the tree.
*
* @param key The context key
* @returns The context value or throws error if there is no context value for this key
*/
getContext(key) {
const value = this._context[key];
if (value !== undefined) {
return value;
}
if (value === undefined && !this.scope?.node) {
throw new Error(`No context value present for ${key} key`);
}
return this.scope && this.scope.node.getContext(key);
}
/**
* Retrieves a value from tree context.
*
* Context is usually initialized at the root, but can be overridden at any point in the tree.
*
* @param key The context key
* @returns The context value or `undefined` if there is no context value for this key.
*/
tryGetContext(key) {
const value = this._context[key];
if (value !== undefined) {
return value;
}
return this.scope && this.scope.node.tryGetContext(key);
}
/**
* An immutable array of metadata objects associated with this construct.
* This can be used, for example, to implement support for deprecation notices, source mapping, etc.
*/
get metadata() {
return [...this._metadata];
}
/**
* Adds a metadata entry to this construct.
* Entries are arbitrary values and will also include a stack trace to allow tracing back to
* the code location for when the entry was added. It can be used, for example, to include source
* mapping in CloudFormation templates to improve diagnostics.
*
* @param type a string denoting the type of metadata
* @param data the value of the metadata (can be a Token). If null/undefined, metadata will not be added.
* @param options options
*/
addMetadata(type, data, options = {}) {
if (data == null) {
return;
}
const shouldTrace = options.stackTrace ?? false;
const trace = shouldTrace ? (0, stack_trace_1.captureStackTrace)(options.traceFromFunction ?? this.addMetadata) : undefined;
this._metadata.push({ type, data, trace });
}
/**
* All parent scopes of this construct.
*
* @returns a list of parent scopes. The last element in the list will always
* be the current construct and the first element will be the root of the
* tree.
*/
get scopes() {
const ret = new Array();
let curr = this.host;
while (curr) {
ret.unshift(curr);
curr = curr.node.scope;
}
return ret;
}
/**
* Returns the root of the construct tree.
* @returns The root of the construct tree.
*/
get root() {
return this.scopes[0];
}
/**
* Returns true if this construct or the scopes in which it is defined are
* locked.
*/
get locked() {
if (this._locked) {
return true;
}
if (this.scope && this.scope.node.locked) {
return true;
}
return false;
}
/**
* Add an ordering dependency on another construct.
*
* An `IDependable`
*/
addDependency(...deps) {
for (const d of deps) {
this._dependencies.add(d);
}
}
/**
* Return all dependencies registered on this node (non-recursive).
*/
get dependencies() {
const result = new Array();
for (const dep of this._dependencies) {
for (const root of dependency_1.Dependable.of(dep).dependencyRoots) {
result.push(root);
}
}
return result;
}
/**
* Remove the child with the given name, if present.
*
* @returns Whether a child with the given name was deleted.
* @experimental
*/
tryRemoveChild(childName) {
if (!(childName in this._children)) {
return false;
}
delete this._children[childName];
return true;
}
/**
* Adds a validation to this construct.
*
* When `node.validate()` is called, the `validate()` method will be called on
* all validations and all errors will be returned.
*
* @param validation The validation object
*/
addValidation(validation) {
this._validations.push(validation);
}
/**
* Validates this construct.
*
* Invokes the `validate()` method on all validations added through
* `addValidation()`.
*
* @returns an array of validation error messages associated with this
* construct.
*/
validate() {
const deprecated = ['validate', 'onValidate', 'synthesize', 'onSynthesize', 'prepare', 'onPrepare'];
for (const method of deprecated) {
if (typeof (this.host[method]) === 'function') {
throw new Error(`the construct "${this.path}" has a "${method}()" method which is no longer supported. Use "construct.node.addValidation()" to add validations to a construct`);
}
}
const errors = new Array();
for (const v of this._validations) {
errors.push(...v.validate());
}
return errors;
}
/**
* Locks this construct from allowing more children to be added. After this
* call, no more children can be added to this construct or to any children.
*/
lock() {
this._locked = true;
}
/**
* Adds a child construct to this node.
*
* @param child The child construct
* @param childName The type name of the child construct.
* @returns The resolved path part name of the child
*/
addChild(child, childName) {
if (this.locked) {
// special error if root is locked
if (!this.path) {
throw new Error('Cannot add children during synthesis');
}
throw new Error(`Cannot add children to "${this.path}" during synthesis`);
}
if (childName in this._children) {
const name = this.id ?? '';
const typeName = this.host.constructor.name;
throw new Error(`There is already a Construct with name '${childName}' in ${typeName}${name.length > 0 ? ' [' + name + ']' : ''}`);
}
if (!childName && this.id) {
throw new Error(`cannot add a nameless construct to the named scope: ${this.path}`);
}
this._children[childName] = child;
if (Object.keys(this._children).length > 1 && Object.keys(this._children).filter(x => !x).length > 0) {
throw new Error('only a single construct is allowed in a scope if it has an empty name');
}
}
}
_a = JSII_RTTI_SYMBOL_1;
Node[_a] = { fqn: "constructs.Node", version: "10.2.69" };
/**
* Separator used to delimit construct path components.
*/
Node.PATH_SEP = '/';
exports.Node = Node;
/**
* Represents the building block of the construct graph.
*
* All constructs besides the root construct must be created within the scope of
* another construct.
*/
class Construct {
/**
* Checks if `x` is a construct.
*
* Use this method instead of `instanceof` to properly detect `Construct`
* instances, even when the construct library is symlinked.
*
* Explanation: in JavaScript, multiple copies of the `constructs` library on
* disk are seen as independent, completely different libraries. As a
* consequence, the class `Construct` in each copy of the `constructs` library
* is seen as a different class, and an instance of one class will not test as
* `instanceof` the other class. `npm install` will not create installations
* like this, but users may manually symlink construct libraries together or
* use a monorepo tool: in those cases, multiple copies of the `constructs`
* library can be accidentally installed, and `instanceof` will behave
* unpredictably. It is safest to avoid using `instanceof`, and using
* this type-testing method instead.
*
* @returns true if `x` is an object created from a class which extends `Construct`.
* @param x Any object
*/
static isConstruct(x) {
return x && typeof x === 'object' && x[CONSTRUCT_SYM];
}
/**
* Creates a new construct node.
*
* @param scope The scope in which to define this construct
* @param id The scoped construct ID. Must be unique amongst siblings. If
* the ID includes a path separator (`/`), then it will be replaced by double
* dash `--`.
*/
constructor(scope, id) {
this.node = new Node(this, scope, id);
// implement IDependable privately
dependency_1.Dependable.implement(this, {
dependencyRoots: [this],
});
}
/**
* Returns a string representation of this construct.
*/
toString() {
return this.node.path || '<root>';
}
}
_b = JSII_RTTI_SYMBOL_1;
Construct[_b] = { fqn: "constructs.Construct", version: "10.2.69" };
exports.Construct = Construct;
/**
* In what order to return constructs
*/
var ConstructOrder;
(function (ConstructOrder) {
/**
* Depth-first, pre-order
*/
ConstructOrder[ConstructOrder["PREORDER"] = 0] = "PREORDER";
/**
* Depth-first, post-order (leaf nodes first)
*/
ConstructOrder[ConstructOrder["POSTORDER"] = 1] = "POSTORDER";
})(ConstructOrder = exports.ConstructOrder || (exports.ConstructOrder = {}));
const PATH_SEP_REGEX = new RegExp(`${Node.PATH_SEP}`, 'g');
/**
* Return a sanitized version of an arbitrary string, so it can be used as an ID
*/
function sanitizeId(id) {
// Escape path seps as double dashes
return id.replace(PATH_SEP_REGEX, '--');
}
// Mark all instances of 'Construct'
Object.defineProperty(Construct.prototype, CONSTRUCT_SYM, {
value: true,
enumerable: false,
writable: false,
});
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{ Dependable, IDependable } from './dependency';\nimport { MetadataEntry } from './metadata';\nimport { captureStackTrace } from './private/stack-trace';\nimport { addressOf } from './private/uniqueid';\n\nconst CONSTRUCT_SYM = Symbol.for('constructs.Construct');\n\n/**\n * Represents a construct.\n */\nexport interface IConstruct extends IDependable {\n  /**\n   * The tree node.\n   */\n  readonly node: Node;\n}\n\n/**\n * Represents the construct node in the scope tree.\n */\nexport class Node {\n  /**\n   * Separator used to delimit construct path components.\n   */\n  public static readonly PATH_SEP = '/';\n\n  /**\n   * Returns the node associated with a construct.\n   * @param construct the construct\n   *\n   * @deprecated use `construct.node` instead\n   */\n  public static of(construct: IConstruct): Node {\n    return construct.node;\n  }\n\n  /**\n   * Returns the scope in which this construct is defined.\n   *\n   * The value is `undefined` at the root of the construct scope tree.\n   */\n  public readonly scope?: IConstruct;\n\n  /**\n   * The id of this construct within the current scope.\n   *\n   * This is a a scope-unique id. To obtain an app-unique id for this construct, use `addr`.\n   */\n  public readonly id: string;\n\n  private _locked = false; // if this is \"true\", addChild will fail\n  private readonly _children: { [id: string]: IConstruct } = { };\n  private readonly _context: { [key: string]: any } = { };\n  private readonly _metadata = new Array<MetadataEntry>();\n  private readonly _dependencies = new Set<IDependable>();\n  private _defaultChild: IConstruct | undefined;\n  private readonly _validations = new Array<IValidation>();\n  private _addr?: string; // cache\n\n  public constructor(private readonly host: Construct, scope: IConstruct, id: string) {\n    id = id ?? ''; // if undefined, convert to empty string\n\n    this.id = sanitizeId(id);\n    this.scope = scope;\n\n    if (scope && !this.id) {\n      throw new Error('Only root constructs may have an empty ID');\n    }\n\n    // add to parent scope\n    scope?.node.addChild(host, this.id);\n  }\n\n  /**\n   * The full, absolute path of this construct in the tree.\n   *\n   * Components are separated by '/'.\n   */\n  public get path(): string {\n    const components = this.scopes.filter(c => c.node.id).map(c => c.node.id);\n    return components.join(Node.PATH_SEP);\n  }\n\n  /**\n   * Returns an opaque tree-unique address for this construct.\n   *\n   * Addresses are 42 characters hexadecimal strings. They begin with \"c8\"\n   * followed by 40 lowercase hexadecimal characters (0-9a-f).\n   *\n   * Addresses are calculated using a SHA-1 of the components of the construct\n   * path.\n   *\n   * To enable refactorings of construct trees, constructs with the ID `Default`\n   * will be excluded from the calculation. In those cases constructs in the\n   * same tree may have the same addreess.\n   *\n   * @example c83a2846e506bcc5f10682b564084bca2d275709ee\n   */\n  public get addr(): string {\n    if (!this._addr) {\n      this._addr = addressOf(this.scopes.map(c => c.node.id));\n    }\n\n    return this._addr;\n  }\n\n  /**\n   * Return a direct child by id, or undefined\n   *\n   * @param id Identifier of direct child\n   * @returns the child if found, or undefined\n   */\n  public tryFindChild(id: string): IConstruct | undefined {\n    return this._children[sanitizeId(id)];\n  }\n\n  /**\n   * Return a direct child by id\n   *\n   * Throws an error if the child is not found.\n   *\n   * @param id Identifier of direct child\n   * @returns Child with the given id.\n   */\n  public findChild(id: string): IConstruct {\n    const ret = this.tryFindChild(id);\n    if (!ret) {\n      throw new Error(`No child with id: '${id}'`);\n    }\n    return ret;\n  }\n\n  /**\n   * Returns the child construct that has the id `Default` or `Resource\"`.\n   * This is usually the construct that provides the bulk of the underlying functionality.\n   * Useful for modifications of the underlying construct that are not available at the higher levels.\n   *\n   * @throws if there is more than one child\n   * @returns a construct or undefined if there is no default child\n   */\n  public get defaultChild(): IConstruct | undefined {\n    if (this._defaultChild !== undefined) {\n      return this._defaultChild;\n    }\n\n    const resourceChild = this.tryFindChild('Resource');\n    const defaultChild = this.tryFindChild('Default');\n    if (resourceChild && defaultChild) {\n      throw new Error(`Cannot determine default child for ${this.path}. There is both a child with id \"Resource\" and id \"Default\"`);\n    }\n\n    return defaultChild || resourceChild;\n  }\n\n  /**\n   * Override the defaultChild property.\n   *\n   * This should only be used in the cases where the correct\n   * default child is not named 'Resource' or 'Default' as it\n   * should be.\n   *\n   * If you set this to undefined, the default behavior of finding\n   * the child named 'Resource' or 'Default' will be used.\n   */\n  public set defaultChild(value: IConstruct | undefined) {\n    this._defaultChild = value;\n  }\n\n  /**\n   * All direct children of this construct.\n   */\n  public get children() {\n    return Object.values(this._children);\n  }\n\n  /**\n   * Return this construct and all of its children in the given order\n   */\n  public findAll(order: ConstructOrder = ConstructOrder.PREORDER): IConstruct[] {\n    const ret = new Array<IConstruct>();\n    visit(this.host);\n    return ret;\n\n    function visit(c: IConstruct) {\n      if (order === ConstructOrder.PREORDER) {\n        ret.push(c);\n      }\n\n      for (const child of c.node.children) {\n        visit(child);\n      }\n\n      if (order === ConstructOrder.POSTORDER) {\n        ret.push(c);\n      }\n    }\n  }\n\n  /**\n   * This can be used to set contextual values.\n   * Context must be set before any children are added, since children may consult context info during construction.\n   * If the key already exists, it will be overridden.\n   * @param key The context key\n   * @param value The context value\n   */\n  public setContext(key: string, value: any) {\n    if (this.children.length > 0) {\n      const names = this.children.map(c => c.node.id);\n      throw new Error('Cannot set context after children have been added: ' + names.join(','));\n    }\n    this._context[key] = value;\n  }\n\n  /**\n   * Retrieves a value from tree context if present. Otherwise, would throw an error.\n   *\n   * Context is usually initialized at the root, but can be overridden at any point in the tree.\n   *\n   * @param key The context key\n   * @returns The context value or throws error if there is no context value for this key\n   */\n  public getContext(key: string): any {\n    const value = this._context[key];\n\n    if (value !== undefined) { return value; }\n\n    if (value === undefined && !this.scope?.node) {\n      throw new Error(`No context value present for ${key} key`);\n    }\n\n    return this.scope && this.scope.node.getContext(key);\n  }\n\n  /**\n   * Retrieves a value from tree context.\n   *\n   * Context is usually initialized at the root, but can be overridden at any point in the tree.\n   *\n   * @param key The context key\n   * @returns The context value or `undefined` if there is no context value for this key.\n   */\n  public tryGetContext(key: string): any {\n    const value = this._context[key];\n    if (value !== undefined) { return value; }\n\n    return this.scope && this.scope.node.tryGetContext(key);\n  }\n\n  /**\n   * An immutable array of metadata objects associated with this construct.\n   * This can be used, for example, to implement support for deprecation notices, source mapping, etc.\n   */\n  public get metadata() {\n    return [...this._metadata];\n  }\n\n  /**\n   * Adds a metadata entry to this construct.\n   * Entries are arbitrary values and will also include a stack trace to allow tracing back to\n   * the code location for when the entry was added. It can be used, for example, to include source\n   * mapping in CloudFormation templates to improve diagnostics.\n   *\n   * @param type a string denoting the type of metadata\n   * @param data the value of the metadata (can be a Token). If null/undefined, metadata will not be added.\n   * @param options options\n   */\n  public addMetadata(type: string, data: any, options: MetadataOptions = { }): void {\n    if (data == null) {\n      return;\n    }\n\n    const shouldTrace = options.stackTrace ?? false;\n    const trace = shouldTrace ? captureStackTrace(options.traceFromFunction ?? this.addMetadata) : undefined;\n    this._metadata.push({ type, data, trace });\n  }\n\n  /**\n   * All parent scopes of this construct.\n   *\n   * @returns a list of parent scopes. The last element in the list will always\n   * be the current construct and the first element will be the root of the\n   * tree.\n   */\n  public get scopes(): IConstruct[] {\n    const ret = new Array<IConstruct>();\n\n    let curr: IConstruct | undefined = this.host;\n    while (curr) {\n      ret.unshift(curr);\n      curr = curr.node.scope;\n    }\n\n    return ret;\n  }\n\n  /**\n   * Returns the root of the construct tree.\n   * @returns The root of the construct tree.\n   */\n  public get root() {\n    return this.scopes[0];\n  }\n\n  /**\n   * Returns true if this construct or the scopes in which it is defined are\n   * locked.\n   */\n  public get locked() {\n    if (this._locked) {\n      return true;\n    }\n\n    if (this.scope && this.scope.node.locked) {\n      return true;\n    }\n\n    return false;\n  }\n\n  /**\n   * Add an ordering dependency on another construct.\n   *\n   * An `IDependable`\n   */\n  public addDependency(...deps: IDependable[]) {\n    for (const d of deps) {\n      this._dependencies.add(d);\n    }\n  }\n\n  /**\n   * Return all dependencies registered on this node (non-recursive).\n   */\n  public get dependencies(): IConstruct[] {\n    const result = new Array<IConstruct>();\n    for (const dep of this._dependencies) {\n      for (const root of Dependable.of(dep).dependencyRoots) {\n        result.push(root);\n      }\n    }\n\n    return result;\n  }\n\n  /**\n   * Remove the child with the given name, if present.\n   *\n   * @returns Whether a child with the given name was deleted.\n   * @experimental\n   */\n  public tryRemoveChild(childName: string): boolean {\n    if (!(childName in this._children)) { return false; }\n    delete this._children[childName];\n    return true;\n  }\n\n  /**\n   * Adds a validation to this construct.\n   *\n   * When `node.validate()` is called, the `validate()` method will be called on\n   * all validations and all errors will be returned.\n   *\n   * @param validation The validation object\n   */\n  public addValidation(validation: IValidation) {\n    this._validations.push(validation);\n  }\n\n  /**\n   * Validates this construct.\n   *\n   * Invokes the `validate()` method on all validations added through\n   * `addValidation()`.\n   *\n   * @returns an array of validation error messages associated with this\n   * construct.\n   */\n  public validate(): string[] {\n    const deprecated = ['validate', 'onValidate', 'synthesize', 'onSynthesize', 'prepare', 'onPrepare'];\n    for (const method of deprecated) {\n      if (typeof((this.host as any)[method]) === 'function') {\n        throw new Error(`the construct \"${this.path}\" has a \"${method}()\" method which is no longer supported. Use \"construct.node.addValidation()\" to add validations to a construct`);\n      }\n    }\n\n    const errors = new Array<string>();\n    for (const v of this._validations) {\n      errors.push(...v.validate());\n    }\n\n    return errors;\n  }\n\n  /**\n   * Locks this construct from allowing more children to be added. After this\n   * call, no more children can be added to this construct or to any children.\n   */\n  public lock() {\n    this._locked = true;\n  }\n\n  /**\n   * Adds a child construct to this node.\n   *\n   * @param child The child construct\n   * @param childName The type name of the child construct.\n   * @returns The resolved path part name of the child\n   */\n  private addChild(child: Construct, childName: string) {\n    if (this.locked) {\n\n      // special error if root is locked\n      if (!this.path) {\n        throw new Error('Cannot add children during synthesis');\n      }\n\n      throw new Error(`Cannot add children to \"${this.path}\" during synthesis`);\n    }\n\n    if (childName in this._children) {\n      const name = this.id ?? '';\n      const typeName = this.host.constructor.name;\n      throw new Error(`There is already a Construct with name '${childName}' in ${typeName}${name.length > 0 ? ' [' + name + ']' : ''}`);\n    }\n\n    if (!childName && this.id) {\n      throw new Error(`cannot add a nameless construct to the named scope: ${this.path}`);\n    }\n\n    this._children[childName] = child;\n\n    if (Object.keys(this._children).length > 1 && Object.keys(this._children).filter(x => !x).length > 0) {\n      throw new Error('only a single construct is allowed in a scope if it has an empty name');\n    }\n  }\n}\n\n/**\n * Represents the building block of the construct graph.\n *\n * All constructs besides the root construct must be created within the scope of\n * another construct.\n */\nexport class Construct implements IConstruct {\n  /**\n   * Checks if `x` is a construct.\n   *\n   * Use this method instead of `instanceof` to properly detect `Construct`\n   * instances, even when the construct library is symlinked.\n   *\n   * Explanation: in JavaScript, multiple copies of the `constructs` library on\n   * disk are seen as independent, completely different libraries. As a\n   * consequence, the class `Construct` in each copy of the `constructs` library\n   * is seen as a different class, and an instance of one class will not test as\n   * `instanceof` the other class. `npm install` will not create installations\n   * like this, but users may manually symlink construct libraries together or\n   * use a monorepo tool: in those cases, multiple copies of the `constructs`\n   * library can be accidentally installed, and `instanceof` will behave\n   * unpredictably. It is safest to avoid using `instanceof`, and using\n   * this type-testing method instead.\n   *\n   * @returns true if `x` is an object created from a class which extends `Construct`.\n   * @param x Any object\n   */\n  public static isConstruct(x: any): x is Construct {\n    return x && typeof x === 'object' && x[CONSTRUCT_SYM];\n  }\n\n  /**\n   * The tree node.\n   */\n  public readonly node: Node;\n\n  /**\n   * Creates a new construct node.\n   *\n   * @param scope The scope in which to define this construct\n   * @param id The scoped construct ID. Must be unique amongst siblings. If\n   * the ID includes a path separator (`/`), then it will be replaced by double\n   * dash `--`.\n   */\n  constructor(scope: Construct, id: string) {\n    this.node = new Node(this, scope, id);\n\n    // implement IDependable privately\n    Dependable.implement(this, {\n      dependencyRoots: [this],\n    });\n  }\n\n  /**\n   * Returns a string representation of this construct.\n   */\n  public toString() {\n    return this.node.path || '<root>';\n  }\n}\n\n/**\n * Implement this interface in order for the construct to be able to validate itself.\n */\nexport interface IValidation {\n  /**\n   * Validate the current construct.\n   *\n   * This method can be implemented by derived constructs in order to perform\n   * validation logic. It is called on all constructs before synthesis.\n   *\n   * @returns An array of validation error messages, or an empty array if there the construct is valid.\n   */\n  validate(): string[];\n}\n\n/**\n * In what order to return constructs\n */\nexport enum ConstructOrder {\n  /**\n   * Depth-first, pre-order\n   */\n  PREORDER,\n\n  /**\n   * Depth-first, post-order (leaf nodes first)\n   */\n  POSTORDER\n}\n\nconst PATH_SEP_REGEX = new RegExp(`${Node.PATH_SEP}`, 'g');\n\n/**\n * Return a sanitized version of an arbitrary string, so it can be used as an ID\n */\nfunction sanitizeId(id: string) {\n  // Escape path seps as double dashes\n  return id.replace(PATH_SEP_REGEX, '--');\n}\n\n/**\n * Options for `construct.addMetadata()`.\n */\nexport interface MetadataOptions {\n  /**\n   * Include stack trace with metadata entry.\n   * @default false\n   */\n  readonly stackTrace?: boolean;\n\n  /**\n   * A JavaScript function to begin tracing from.\n   *\n   * This option is ignored unless `stackTrace` is `true`.\n   *\n   * @default addMetadata()\n   */\n  readonly traceFromFunction?: any;\n}\n\n// Mark all instances of 'Construct'\nObject.defineProperty(Construct.prototype, CONSTRUCT_SYM, {\n  value: true,\n  enumerable: false,\n  writable: false,\n});\n"]}