construct.js
  1  "use strict";
  2  var _a, _b;
  3  Object.defineProperty(exports, "__esModule", { value: true });
  4  exports.ConstructOrder = exports.Construct = exports.Node = void 0;
  5  const JSII_RTTI_SYMBOL_1 = Symbol.for("jsii.rtti");
  6  const metadata_1 = require("./metadata");
  7  const dependency_1 = require("./private/dependency");
  8  const stack_trace_1 = require("./private/stack-trace");
  9  const uniqueid_1 = require("./private/uniqueid");
 10  const CONSTRUCT_NODE_PROPERTY_SYMBOL = Symbol.for('constructs.Construct.node');
 11  /**
 12   * Represents the construct node in the scope tree.
 13   *
 14   * @stability stable
 15   */
 16  class Node {
 17      /**
 18       * @stability stable
 19       */
 20      constructor(host, scope, id) {
 21          this.host = host;
 22          this._locked = false; // if this is "true", addChild will fail
 23          this._aspects = [];
 24          this._children = {};
 25          this._context = {};
 26          this._metadata = new Array();
 27          this._dependencies = new Set();
 28          this.invokedAspects = [];
 29          this._validations = new Array();
 30          id = id || ''; // if undefined, convert to empty string
 31          this.id = sanitizeId(id);
 32          this.scope = scope;
 33          // We say that scope is required, but root scopes will bypass the type
 34          // checks and actually pass in 'undefined'.
 35          if (scope != null) {
 36              if (id === '') {
 37                  throw new Error('Only root constructs may have an empty name');
 38              }
 39              // Has side effect so must be very last thing in constructor
 40              Node.of(scope).addChild(host, this.id);
 41          }
 42          else {
 43              // This is a root construct.
 44              this.id = id;
 45          }
 46      }
 47      /**
 48       * Returns the node associated with a construct.
 49       *
 50       * @param construct the construct.
 51       * @stability stable
 52       */
 53      static of(construct) {
 54          const node = construct[CONSTRUCT_NODE_PROPERTY_SYMBOL];
 55          if (!node) {
 56              throw new Error('construct does not have an associated node. All constructs must extend the "Construct" base class');
 57          }
 58          return node;
 59      }
 60      /**
 61       * The full, absolute path of this construct in the tree.
 62       *
 63       * Components are separated by '/'.
 64       *
 65       * @stability stable
 66       */
 67      get path() {
 68          const components = this.scopes.slice(1).map(c => Node.of(c).id);
 69          return components.join(Node.PATH_SEP);
 70      }
 71      /**
 72       * Returns an opaque tree-unique address for this construct.
 73       *
 74       * Addresses are 42 characters hexadecimal strings. They begin with "c8"
 75       * followed by 40 lowercase hexadecimal characters (0-9a-f).
 76       *
 77       * Addresses are calculated using a SHA-1 of the components of the construct
 78       * path.
 79       *
 80       * To enable refactorings of construct trees, constructs with the ID `Default`
 81       * will be excluded from the calculation. In those cases constructs in the
 82       * same tree may have the same addreess.
 83       *
 84       * @stability stable
 85       * @example
 86       *
 87       * c83a2846e506bcc5f10682b564084bca2d275709ee
 88       */
 89      get addr() {
 90          if (!this._addr) {
 91              this._addr = uniqueid_1.addressOf(this.scopes.map(c => Node.of(c).id));
 92          }
 93          return this._addr;
 94      }
 95      /**
 96       * (deprecated) A tree-global unique alphanumeric identifier for this construct.
 97       *
 98       * Includes
 99       * all components of the tree.
100       *
101       * @deprecated please avoid using this property and use `addr` to form unique names.
102       * This algorithm uses MD5, which is not FIPS-complient and also excludes the
103       * identity of the root construct from the calculation.
104       */
105      get uniqueId() {
106          const components = this.scopes.slice(1).map(c => Node.of(c).id);
107          return components.length > 0 ? uniqueid_1.makeLegacyUniqueId(components) : '';
108      }
109      /**
110       * Return a direct child by id, or undefined.
111       *
112       * @param id Identifier of direct child.
113       * @returns the child if found, or undefined
114       * @stability stable
115       */
116      tryFindChild(id) {
117          return this._children[sanitizeId(id)];
118      }
119      /**
120       * Return a direct child by id.
121       *
122       * Throws an error if the child is not found.
123       *
124       * @param id Identifier of direct child.
125       * @returns Child with the given id.
126       * @stability stable
127       */
128      findChild(id) {
129          const ret = this.tryFindChild(id);
130          if (!ret) {
131              throw new Error(`No child with id: '${id}'`);
132          }
133          return ret;
134      }
135      /**
136       * Returns the child construct that has the id `Default` or `Resource"`.
137       *
138       * This is usually the construct that provides the bulk of the underlying functionality.
139       * Useful for modifications of the underlying construct that are not available at the higher levels.
140       * Override the defaultChild property.
141       *
142       * This should only be used in the cases where the correct
143       * default child is not named 'Resource' or 'Default' as it
144       * should be.
145       *
146       * If you set this to undefined, the default behavior of finding
147       * the child named 'Resource' or 'Default' will be used.
148       *
149       * @returns a construct or undefined if there is no default child
150       * @stability stable
151       * @throws if there is more than one child
152       */
153      get defaultChild() {
154          if (this._defaultChild !== undefined) {
155              return this._defaultChild;
156          }
157          const resourceChild = this.tryFindChild('Resource');
158          const defaultChild = this.tryFindChild('Default');
159          if (resourceChild && defaultChild) {
160              throw new Error(`Cannot determine default child for ${this.path}. There is both a child with id "Resource" and id "Default"`);
161          }
162          return defaultChild || resourceChild;
163      }
164      /**
165       * Returns the child construct that has the id `Default` or `Resource"`.
166       *
167       * This is usually the construct that provides the bulk of the underlying functionality.
168       * Useful for modifications of the underlying construct that are not available at the higher levels.
169       * Override the defaultChild property.
170       *
171       * This should only be used in the cases where the correct
172       * default child is not named 'Resource' or 'Default' as it
173       * should be.
174       *
175       * If you set this to undefined, the default behavior of finding
176       * the child named 'Resource' or 'Default' will be used.
177       *
178       * @returns a construct or undefined if there is no default child
179       * @stability stable
180       * @throws if there is more than one child
181       */
182      set defaultChild(value) {
183          this._defaultChild = value;
184      }
185      /**
186       * All direct children of this construct.
187       *
188       * @stability stable
189       */
190      get children() {
191          return Object.values(this._children);
192      }
193      /**
194       * Return this construct and all of its children in the given order.
195       *
196       * @stability stable
197       */
198      findAll(order = ConstructOrder.PREORDER) {
199          const ret = new Array();
200          visit(this.host);
201          return ret;
202          function visit(c) {
203              if (order === ConstructOrder.PREORDER) {
204                  ret.push(c);
205              }
206              for (const child of Node.of(c).children) {
207                  visit(child);
208              }
209              if (order === ConstructOrder.POSTORDER) {
210                  ret.push(c);
211              }
212          }
213      }
214      /**
215       * This can be used to set contextual values.
216       *
217       * Context must be set before any children are added, since children may consult context info during construction.
218       * If the key already exists, it will be overridden.
219       *
220       * @param key The context key.
221       * @param value The context value.
222       * @stability stable
223       */
224      setContext(key, value) {
225          if (this.children.length > 0) {
226              const names = this.children.map(c => Node.of(c).id);
227              throw new Error('Cannot set context after children have been added: ' + names.join(','));
228          }
229          this._context[key] = value;
230      }
231      /**
232       * Retrieves a value from tree context.
233       *
234       * Context is usually initialized at the root, but can be overridden at any point in the tree.
235       *
236       * @param key The context key.
237       * @returns The context value or `undefined` if there is no context value for thie key.
238       * @stability stable
239       */
240      tryGetContext(key) {
241          const value = this._context[key];
242          if (value !== undefined) {
243              return value;
244          }
245          return this.scope && Node.of(this.scope).tryGetContext(key);
246      }
247      /**
248       * An immutable array of metadata objects associated with this construct.
249       *
250       * This can be used, for example, to implement support for deprecation notices, source mapping, etc.
251       *
252       * @stability stable
253       */
254      get metadata() {
255          return [...this._metadata];
256      }
257      /**
258       * Adds a metadata entry to this construct.
259       *
260       * Entries are arbitrary values and will also include a stack trace to allow tracing back to
261       * the code location for when the entry was added. It can be used, for example, to include source
262       * mapping in CloudFormation templates to improve diagnostics.
263       *
264       * @param type a string denoting the type of metadata.
265       * @param data the value of the metadata (can be a Token).
266       * @param fromFunction a function under which to restrict the metadata entry's stack trace (defaults to this.addMetadata).
267       * @stability stable
268       */
269      addMetadata(type, data, fromFunction) {
270          if (data == null) {
271              return;
272          }
273          const trace = this.tryGetContext(metadata_1.ConstructMetadata.DISABLE_STACK_TRACE_IN_METADATA)
274              ? undefined
275              : stack_trace_1.captureStackTrace(fromFunction || this.addMetadata);
276          this._metadata.push({ type, data, trace });
277      }
278      /**
279       * Adds a { "info": <message> } metadata entry to this construct.
280       *
281       * The toolkit will display the info message when apps are synthesized.
282       *
283       * @param message The info message.
284       * @stability stable
285       */
286      addInfo(message) {
287          this.addMetadata(metadata_1.ConstructMetadata.INFO_METADATA_KEY, message);
288      }
289      /**
290       * Adds a { "warning": <message> } metadata entry to this construct.
291       *
292       * The toolkit will display the warning when an app is synthesized, or fail
293       * if run in --strict mode.
294       *
295       * @param message The warning message.
296       * @stability stable
297       */
298      addWarning(message) {
299          this.addMetadata(metadata_1.ConstructMetadata.WARNING_METADATA_KEY, message);
300      }
301      /**
302       * Adds an { "error": <message> } metadata entry to this construct.
303       *
304       * The toolkit will fail synthesis when errors are reported.
305       *
306       * @param message The error message.
307       * @stability stable
308       */
309      addError(message) {
310          this.addMetadata(metadata_1.ConstructMetadata.ERROR_METADATA_KEY, message);
311      }
312      /**
313       * Applies the aspect to this Constructs node.
314       *
315       * @stability stable
316       */
317      applyAspect(aspect) {
318          this._aspects.push(aspect);
319          return;
320      }
321      /**
322       * All parent scopes of this construct.
323       *
324       * @returns a list of parent scopes. The last element in the list will always
325       * be the current construct and the first element will be the root of the
326       * tree.
327       * @stability stable
328       */
329      get scopes() {
330          const ret = new Array();
331          let curr = this.host;
332          while (curr) {
333              ret.unshift(curr);
334              curr = Node.of(curr).scope;
335          }
336          return ret;
337      }
338      /**
339       * Returns the root of the construct tree.
340       *
341       * @returns The root of the construct tree.
342       * @stability stable
343       */
344      get root() {
345          return this.scopes[0];
346      }
347      /**
348       * Returns true if this construct or the scopes in which it is defined are locked.
349       *
350       * @stability stable
351       */
352      get locked() {
353          if (this._locked) {
354              return true;
355          }
356          if (this.scope && Node.of(this.scope).locked) {
357              return true;
358          }
359          return false;
360      }
361      /**
362       * Add an ordering dependency on another Construct.
363       *
364       * All constructs in the dependency's scope will be deployed before any
365       * construct in this construct's scope.
366       *
367       * @stability stable
368       */
369      addDependency(...dependencies) {
370          for (const dependency of dependencies) {
371              this._dependencies.add(dependency);
372          }
373      }
374      /**
375       * Return all dependencies registered on this node or any of its children.
376       *
377       * @stability stable
378       */
379      get dependencies() {
380          const found = new Map(); // Deduplication map
381          const ret = new Array();
382          for (const source of this.findAll()) {
383              for (const dependable of Node.of(source)._dependencies) {
384                  for (const target of dependency_1.DependableTrait.get(dependable).dependencyRoots) {
385                      let foundTargets = found.get(source);
386                      if (!foundTargets) {
387                          found.set(source, foundTargets = new Set());
388                      }
389                      if (!foundTargets.has(target)) {
390                          ret.push({ source, target });
391                          foundTargets.add(target);
392                      }
393                  }
394              }
395          }
396          return ret;
397      }
398      /**
399       * (experimental) Remove the child with the given name, if present.
400       *
401       * @returns Whether a child with the given name was deleted.
402       * @experimental
403       */
404      tryRemoveChild(childName) {
405          if (!(childName in this._children)) {
406              return false;
407          }
408          delete this._children[childName];
409          return true;
410      }
411      /**
412       * Adds a validation to this construct.
413       *
414       * When `node.validate()` is called, the `validate()` method will be called on
415       * all validations and all errors will be returned.
416       *
417       * @stability stable
418       */
419      addValidation(validation) {
420          this._validations.push(validation);
421      }
422      /**
423       * Synthesizes a CloudAssembly from a construct tree.
424       *
425       * @param options Synthesis options.
426       * @stability stable
427       */
428      synthesize(options) {
429          // the three holy phases of synthesis: prepare, validate and synthesize
430          // prepare
431          this.prepare();
432          // validate
433          const validate = options.skipValidation === undefined ? true : !options.skipValidation;
434          if (validate) {
435              const errors = this.validate();
436              if (errors.length > 0) {
437                  const errorList = errors.map(e => `[${Node.of(e.source).path}] ${e.message}`).join('\n  ');
438                  throw new Error(`Validation failed with the following errors:\n  ${errorList}`);
439              }
440          }
441          // synthesize (leaves first)
442          for (const construct of this.findAll(ConstructOrder.POSTORDER)) {
443              const node = Node.of(construct);
444              try {
445                  node._lock();
446                  const ctx = {
447                      ...options.sessionContext,
448                      outdir: options.outdir,
449                  };
450                  construct.onSynthesize(ctx); // "as any" is needed because we want to keep "synthesize" protected
451              }
452              finally {
453                  node._unlock();
454              }
455          }
456      }
457      /**
458       * Invokes "prepare" on all constructs (depth-first, post-order) in the tree under `node`.
459       *
460       * @stability stable
461       */
462      prepare() {
463          // Aspects are applied root to leaf
464          for (const construct of this.findAll(ConstructOrder.PREORDER)) {
465              Node.of(construct).invokeAspects();
466          }
467          // since constructs can be added to the tree during invokeAspects, call findAll() to recreate the list.
468          // use PREORDER.reverse() for backward compatability
469          for (const construct of this.findAll(ConstructOrder.PREORDER).reverse()) {
470              const cn = construct;
471              if ('onPrepare' in cn) {
472                  if (typeof (cn.onPrepare) !== 'function') {
473                      throw new Error('expecting "onPrepare" to be a function');
474                  }
475                  cn.onPrepare();
476              }
477          }
478      }
479      /**
480       * Validates tree (depth-first, pre-order) and returns the list of all errors.
481       *
482       * An empty list indicates that there are no errors.
483       *
484       * @stability stable
485       */
486      validate() {
487          let errors = new Array();
488          for (const child of this.children) {
489              errors = errors.concat(Node.of(child).validate());
490          }
491          const localErrors = this.host.onValidate(); // "as any" is needed because we want to keep "validate" protected
492          // invoke validations
493          for (const v of this._validations) {
494              localErrors.push(...v.validate());
495          }
496          return errors.concat(localErrors.map(msg => ({ source: this.host, message: msg })));
497      }
498      /**
499       * Locks this construct from allowing more children to be added. After this
500       * call, no more children can be added to this construct or to any children.
501       * @internal
502       */
503      _lock() {
504          this._locked = true;
505      }
506      /**
507       * Unlocks this costruct and allows mutations (adding children).
508       * @internal
509       */
510      _unlock() {
511          this._locked = false;
512      }
513      /**
514       * Adds a child construct to this node.
515       *
516       * @param child The child construct
517       * @param childName The type name of the child construct.
518       * @returns The resolved path part name of the child
519       */
520      addChild(child, childName) {
521          if (this.locked) {
522              // special error if root is locked
523              if (!this.path) {
524                  throw new Error('Cannot add children during synthesis');
525              }
526              throw new Error(`Cannot add children to "${this.path}" during synthesis`);
527          }
528          if (childName in this._children) {
529              const name = this.id || '';
530              const typeName = this.host.constructor.name;
531              throw new Error(`There is already a Construct with name '${childName}' in ${typeName}${name.length > 0 ? ' [' + name + ']' : ''}`);
532          }
533          this._children[childName] = child;
534      }
535      /**
536       * Triggers each aspect to invoke visit
537       */
538      invokeAspects() {
539          const descendants = this.findAll();
540          for (const aspect of this._aspects) {
541              if (this.invokedAspects.includes(aspect)) {
542                  continue;
543              }
544              descendants.forEach(member => aspect.visit(member));
545              this.invokedAspects.push(aspect);
546          }
547      }
548  }
549  exports.Node = Node;
550  _a = JSII_RTTI_SYMBOL_1;
551  Node[_a] = { fqn: "constructs.Node", version: "3.3.161" };
552  /**
553   * Separator used to delimit construct path components.
554   *
555   * @stability stable
556   */
557  Node.PATH_SEP = '/';
558  /**
559   * Represents the building block of the construct graph.
560   *
561   * All constructs besides the root construct must be created within the scope of
562   * another construct.
563   *
564   * @stability stable
565   */
566  class Construct {
567      /**
568       * Creates a new construct node.
569       *
570       * @param scope The scope in which to define this construct.
571       * @param id The scoped construct ID.
572       * @param options Options.
573       * @stability stable
574       */
575      constructor(scope, id, options = {}) {
576          var _c;
577          // attach the construct to the construct tree by creating a node
578          const nodeFactory = (_c = options.nodeFactory) !== null && _c !== void 0 ? _c : { createNode: (host, nodeScope, nodeId) => new Node(host, nodeScope, nodeId) };
579          Object.defineProperty(this, CONSTRUCT_NODE_PROPERTY_SYMBOL, {
580              value: nodeFactory.createNode(this, scope, id),
581              enumerable: false,
582              configurable: false,
583          });
584          // implement IDependable privately
585          dependency_1.DependableTrait.implement(this, {
586              dependencyRoots: [this],
587          });
588      }
589      /**
590       * Returns a string representation of this construct.
591       *
592       * @stability stable
593       */
594      toString() {
595          return Node.of(this).path || '<root>';
596      }
597      /**
598       * (deprecated) Validate the current construct.
599       *
600       * This method can be implemented by derived constructs in order to perform
601       * validation logic. It is called on all constructs before synthesis.
602       *
603       * @returns An array of validation error messages, or an empty array if there the construct is valid.
604       * @deprecated use `Node.addValidation()` to subscribe validation functions on this construct
605       * instead of overriding this method.
606       */
607      onValidate() {
608          return [];
609      }
610      /**
611       * Perform final modifications before synthesis.
612       *
613       * This method can be implemented by derived constructs in order to perform
614       * final changes before synthesis. prepare() will be called after child
615       * constructs have been prepared.
616       *
617       * This is an advanced framework feature. Only use this if you
618       * understand the implications.
619       *
620       * @stability stable
621       */
622      onPrepare() {
623          return;
624      }
625      /**
626       * Allows this construct to emit artifacts into the cloud assembly during synthesis.
627       *
628       * This method is usually implemented by framework-level constructs such as `Stack` and `Asset`
629       * as they participate in synthesizing the cloud assembly.
630       *
631       * @param session The synthesis session.
632       * @stability stable
633       */
634      onSynthesize(session) {
635          ignore(session);
636      }
637  }
638  exports.Construct = Construct;
639  _b = JSII_RTTI_SYMBOL_1;
640  Construct[_b] = { fqn: "constructs.Construct", version: "3.3.161" };
641  /**
642   * In what order to return constructs.
643   *
644   * @stability stable
645   */
646  var ConstructOrder;
647  (function (ConstructOrder) {
648      ConstructOrder[ConstructOrder["PREORDER"] = 0] = "PREORDER";
649      ConstructOrder[ConstructOrder["POSTORDER"] = 1] = "POSTORDER";
650  })(ConstructOrder = exports.ConstructOrder || (exports.ConstructOrder = {}));
651  function ignore(_x) {
652      return;
653  }
654  // Import this _after_ everything else to help node work the classes out in the correct order...
655  const PATH_SEP_REGEX = new RegExp(`${Node.PATH_SEP}`, 'g');
656  /**
657   * Return a sanitized version of an arbitrary string, so it can be used as an ID
658   */
659  function sanitizeId(id) {
660      // Escape path seps as double dashes
661      return id.replace(PATH_SEP_REGEX, '--');
662  }
663  //# 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{ IAspect } from './aspect';\nimport { ConstructMetadata, MetadataEntry } from './metadata';\nimport { DependableTrait } from './private/dependency';\nimport { captureStackTrace } from './private/stack-trace';\nimport { makeLegacyUniqueId, addressOf } from './private/uniqueid';\n\nconst CONSTRUCT_NODE_PROPERTY_SYMBOL = Symbol.for('constructs.Construct.node');\n\n                                  \nexport interface IConstruct { }\n\n                                                           \nexport class Node {\n                                                                     \n  public static readonly PATH_SEP = '/';\n\n                                                                                                  \n  public static of(construct: IConstruct): Node {\n    const node = (construct as any)[CONSTRUCT_NODE_PROPERTY_SYMBOL] as Node;\n    if (!node) {\n      throw new Error('construct does not have an associated node. All constructs must extend the \"Construct\" base class');\n    }\n\n    return node;\n  }\n\n                                                                                                                                                  \n  public readonly scope?: IConstruct;\n\n                                                                                                                                                                         \n  public readonly id: string;\n\n  private _locked = false; // if this is \"true\", addChild will fail\n  private readonly _aspects: IAspect[] = [];\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<IConstruct>();\n  private readonly invokedAspects: IAspect[] = [];\n  private _defaultChild: IConstruct | undefined;\n  private readonly _validations = new Array<IValidation>();\n  private _addr?: string; // cache\n\n  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    // We say that scope is required, but root scopes will bypass the type\n    // checks and actually pass in 'undefined'.\n    if (scope != null) {\n      if (id === '') {\n        throw new Error('Only root constructs may have an empty name');\n      }\n\n      // Has side effect so must be very last thing in constructor\n      Node.of(scope).addChild(host, this.id);\n    } else {\n      // This is a root construct.\n      this.id = id;\n    }\n  }\n\n                                                                                                                  \n  public get path(): string {\n    const components = this.scopes.slice(1).map(c => Node.of(c).id);\n    return components.join(Node.PATH_SEP);\n  }\n\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    \n  public get addr(): string {\n    if (!this._addr) {\n      this._addr = addressOf(this.scopes.map(c => Node.of(c).id));\n    }\n\n    return this._addr;\n  }\n\n                                                                                                                                                                                                                                                                                                                                                                 \n  public get uniqueId(): string {\n    const components = this.scopes.slice(1).map(c => Node.of(c).id);\n    return components.length > 0 ? makeLegacyUniqueId(components) : '';\n  }\n\n                                                                                                                                                        \n  public tryFindChild(id: string): IConstruct | undefined {\n    return this._children[sanitizeId(id)];\n  }\n\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  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  public set defaultChild(value: IConstruct | undefined) {\n    this._defaultChild = value;\n  }\n\n                                                       \n  public get children() {\n    return Object.values(this._children);\n  }\n\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 Node.of(c).children) {\n        visit(child);\n      }\n\n      if (order === ConstructOrder.POSTORDER) {\n        ret.push(c);\n      }\n    }\n  }\n\n                                                                                                                                                                                                                                                                                                           \n  public setContext(key: string, value: any) {\n    if (this.children.length > 0) {\n      const names = this.children.map(c => Node.of(c).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  public tryGetContext(key: string): any {\n    const value = this._context[key];\n    if (value !== undefined) { return value; }\n\n    return this.scope && Node.of(this.scope).tryGetContext(key);\n  }\n\n                                                                                                                                                                                              \n  public get metadata() {\n    return [...this._metadata];\n  }\n\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  \n  public addMetadata(type: string, data: any, fromFunction?: any): void {\n    if (data == null) {\n      return;\n    }\n\n    const trace = this.tryGetContext(ConstructMetadata.DISABLE_STACK_TRACE_IN_METADATA)\n      ? undefined\n      : captureStackTrace(fromFunction || this.addMetadata);\n\n    this._metadata.push({ type, data, trace });\n  }\n\n                                                                                                                                                                                               \n  public addInfo(message: string): void {\n    this.addMetadata(ConstructMetadata.INFO_METADATA_KEY, message);\n  }\n\n                                                                                                                                                                                                                                       \n  public addWarning(message: string): void {\n    this.addMetadata(ConstructMetadata.WARNING_METADATA_KEY, message);\n  }\n\n                                                                                                                                                                                       \n  public addError(message: string) {\n    this.addMetadata(ConstructMetadata.ERROR_METADATA_KEY, message);\n  }\n\n                                                           \n  public applyAspect(aspect: IAspect): void {\n    this._aspects.push(aspect);\n    return;\n  }\n\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 = Node.of(curr).scope;\n    }\n\n    return ret;\n  }\n\n                                                                                                      \n  public get root() {\n    return this.scopes[0];\n  }\n\n                                                                                                     \n  public get locked() {\n    if (this._locked) {\n      return true;\n    }\n\n    if (this.scope && Node.of(this.scope).locked) {\n      return true;\n    }\n\n    return false;\n  }\n\n                                                                                                                                                                                          \n  public addDependency(...dependencies: IConstruct[]) {\n    for (const dependency of dependencies) {\n      this._dependencies.add(dependency);\n    }\n  }\n\n                                                                                       \n  public get dependencies(): Dependency[] {\n    const found = new Map<IConstruct, Set<IConstruct>>(); // Deduplication map\n    const ret = new Array<Dependency>();\n\n    for (const source of this.findAll()) {\n      for (const dependable of Node.of(source)._dependencies) {\n        for (const target of DependableTrait.get(dependable).dependencyRoots) {\n          let foundTargets = found.get(source);\n          if (!foundTargets) { found.set(source, foundTargets = new Set()); }\n\n          if (!foundTargets.has(target)) {\n            ret.push({ source, target });\n            foundTargets.add(target);\n          }\n        }\n      }\n    }\n\n    return ret;\n  }\n\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  public addValidation(validation: IValidation) {\n    this._validations.push(validation);\n  }\n\n                                                                                                          \n  public synthesize(options: SynthesisOptions): void {\n    // the three holy phases of synthesis: prepare, validate and synthesize\n\n    // prepare\n    this.prepare();\n\n    // validate\n    const validate = options.skipValidation === undefined ? true : !options.skipValidation;\n    if (validate) {\n      const errors = this.validate();\n      if (errors.length > 0) {\n        const errorList = errors.map(e => `[${Node.of(e.source).path}] ${e.message}`).join('\\n  ');\n        throw new Error(`Validation failed with the following errors:\\n  ${errorList}`);\n      }\n    }\n\n    // synthesize (leaves first)\n    for (const construct of this.findAll(ConstructOrder.POSTORDER)) {\n      const node = Node.of(construct);\n      try {\n        node._lock();\n        const ctx = {\n          ...options.sessionContext,\n          outdir: options.outdir,\n        };\n        (construct as any).onSynthesize(ctx); // \"as any\" is needed because we want to keep \"synthesize\" protected\n      } finally {\n        node._unlock();\n      }\n    }\n  }\n\n                                                                                                        \n  public prepare() {\n    // Aspects are applied root to leaf\n    for (const construct of this.findAll(ConstructOrder.PREORDER)) {\n      Node.of(construct).invokeAspects();\n    }\n\n    // since constructs can be added to the tree during invokeAspects, call findAll() to recreate the list.\n    // use PREORDER.reverse() for backward compatability\n    for (const construct of this.findAll(ConstructOrder.PREORDER).reverse()) {\n      const cn = construct as any;\n      if ('onPrepare' in cn) {\n        if (typeof(cn.onPrepare) !== 'function') { throw new Error('expecting \"onPrepare\" to be a function'); }\n        cn.onPrepare();\n      }\n    }\n  }\n\n                                                                                                                                                   \n  public validate() {\n    let errors = new Array<ValidationError>();\n\n    for (const child of this.children) {\n      errors = errors.concat(Node.of(child).validate());\n    }\n\n    const localErrors: string[] = (this.host as any).onValidate(); // \"as any\" is needed because we want to keep \"validate\" protected\n\n    // invoke validations\n    for (const v of this._validations) {\n      localErrors.push(...v.validate());\n    }\n\n    return errors.concat(localErrors.map(msg => ({ source: this.host, message: msg })));\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   * @internal\n   */\n  private _lock() {\n    this._locked = true;\n  }\n\n  /**\n   * Unlocks this costruct and allows mutations (adding children).\n   * @internal\n   */\n  private _unlock() {\n    this._locked = false;\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    this._children[childName] = child;\n  }\n\n  /**\n   * Triggers each aspect to invoke visit\n   */\n  private invokeAspects(): void {\n    const descendants = this.findAll();\n    for (const aspect of this._aspects) {\n      if (this.invokedAspects.includes(aspect)) {\n        continue;\n      }\n      descendants.forEach(member => aspect.visit(member));\n      this.invokedAspects.push(aspect);\n    }\n  }\n}\n\n                                                                                                                                                                          \nexport class Construct implements IConstruct {\n                                                                                                                                                                                                                                                                                                                         \n  constructor(scope: Construct, id: string, options: ConstructOptions = { }) {\n    // attach the construct to the construct tree by creating a node\n    const nodeFactory = options.nodeFactory ?? { createNode: (host, nodeScope, nodeId) => new Node(host, nodeScope, nodeId) };\n    Object.defineProperty(this, CONSTRUCT_NODE_PROPERTY_SYMBOL, {\n      value: nodeFactory.createNode(this, scope, id),\n      enumerable: false,\n      configurable: false,\n    });\n\n    // implement IDependable privately\n    DependableTrait.implement(this, {\n      dependencyRoots: [this],\n    });\n  }\n\n                                                                   \n  public toString() {\n    return Node.of(this).path || '<root>';\n  }\n\n                                                                                                                                                                                                                                                                                                                                                                                                                                                                \n  protected onValidate(): string[] {\n    return [];\n  }\n\n                                                                                                                                                                                                                                                                                                                                                                      \n  protected onPrepare(): void {\n    return;\n  }\n\n                                                                                                                                                                                                                                                                                                                      \n  protected onSynthesize(session: ISynthesisSession): void {\n    ignore(session);\n  }\n}\n\n                                                         \nexport interface ValidationError {\n                                                       \n  readonly source: Construct;\n\n                                   \n  readonly message: string;\n}\n\n                                                                                             \nexport interface IValidation {\n                                                                                                                                                                                                                                                                                                                        \n  validate(): string[];\n}\n\n                                             \nexport enum ConstructOrder {\n                                       \n  PREORDER,\n\n                                                           \n  POSTORDER\n}\n\n                              \nexport interface Dependency {\n                                      \n  readonly source: IConstruct;\n\n                                         \n  readonly target: IConstruct;\n}\n\n                                                                                                    \nexport interface ISynthesisSession {\n                                                                 \n  readonly outdir: string;\n\n  /**\n   * Additional context passed to synthesizeNode through `sessionContext`.\n   */\n  [key: string]: any;\n}\n\n                                 \nexport interface SynthesisOptions {\n                                                                                                                                \n  readonly outdir: string;\n\n                                                                                        \n  readonly skipValidation?: boolean;\n\n                                                                                                                                                                                \n  readonly sessionContext?: { [key: string]: any };\n}\n\nfunction ignore(_x: any) {\n  return;\n}\n\n// Import this _after_ everything else to help node work the classes out in the correct order...\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                                           \nexport interface ConstructOptions {\n                                                                                                                   \n  readonly nodeFactory?: INodeFactory;\n}\n\n                                                            \nexport interface INodeFactory {\n                                                                                                                                                                                        \n  createNode(host: Construct, scope: IConstruct, id: string): Node;\n}\n"]}