aws-cdk
Version:
CDK Toolkit, the command line tool for CDK apps
285 lines • 44.2 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.ResourceImporter = void 0;
const cfnDiff = require("@aws-cdk/cloudformation-diff");
const chalk = require("chalk");
const fs = require("fs-extra");
const promptly = require("promptly");
const logging_1 = require("./logging");
/**
* Resource importing utility class
*
* - Determines the resources added to a template (compared to the deployed version)
* - Look up the identification information
* - Load them from a file, or
* - Ask the user, based on information supplied to us by CloudFormation's GetTemplateSummary
* - Translate the input to a structure expected by CloudFormation, update the template to add the
* importable resources, then run an IMPORT changeset.
*/
class ResourceImporter {
constructor(stack, cfn) {
this.stack = stack;
this.cfn = cfn;
}
/**
* Ask the user for resources to import
*/
async askForResourceIdentifiers(available) {
const ret = { importResources: [], resourceMap: {} };
const resourceIdentifiers = await this.resourceIdentifiers();
for (const resource of available) {
const identifier = await this.askForResourceIdentifier(resourceIdentifiers, resource);
if (!identifier) {
continue;
}
ret.importResources.push(resource);
ret.resourceMap[resource.logicalId] = identifier;
}
return ret;
}
/**
* Load the resources to import from a file
*/
async loadResourceIdentifiers(available, filename) {
const contents = await fs.readJson(filename);
const ret = { importResources: [], resourceMap: {} };
for (const resource of available) {
const descr = this.describeResource(resource.logicalId);
const idProps = contents[resource.logicalId];
if (idProps) {
(0, logging_1.print)('%s: importing using %s', chalk.blue(descr), chalk.blue(fmtdict(idProps)));
ret.importResources.push(resource);
ret.resourceMap[resource.logicalId] = idProps;
delete contents[resource.logicalId];
}
else {
(0, logging_1.print)('%s: skipping', chalk.blue(descr));
}
}
const unknown = Object.keys(contents);
if (unknown.length > 0) {
(0, logging_1.warning)(`Unrecognized resource identifiers in mapping file: ${unknown.join(', ')}`);
}
return ret;
}
/**
* Based on the provided resource mapping, prepare CFN structures for import (template,
* ResourcesToImport structure) and perform the import operation (CloudFormation deployment)
*
* @param importMap Mapping from CDK construct tree path to physical resource import identifiers
* @param options Options to pass to CloudFormation deploy operation
*/
async importResources(importMap, options) {
const resourcesToImport = await this.makeResourcesToImport(importMap);
const updatedTemplate = await this.currentTemplateWithAdditions(importMap.importResources);
try {
const result = await this.cfn.deployStack({
...options,
overrideTemplate: updatedTemplate,
resourcesToImport,
});
const message = result.noOp
? ' ✅ %s (no changes)'
: ' ✅ %s';
(0, logging_1.success)('\n' + message, options.stack.displayName);
}
catch (e) {
(0, logging_1.error)('\n ❌ %s failed: %s', chalk.bold(options.stack.displayName), e);
throw e;
}
}
/**
* Perform a diff between the currently running and the new template, ensure that it is valid
* for importing and return a list of resources that are being added in the new version
*
* @return mapping logicalResourceId -> resourceDifference
*/
async discoverImportableResources(allowNonAdditions = false) {
const currentTemplate = await this.currentTemplate();
const diff = cfnDiff.diffTemplate(currentTemplate, this.stack.template);
// Ignore changes to CDKMetadata
const resourceChanges = Object.entries(diff.resources.changes)
.filter(([logicalId, _]) => logicalId !== 'CDKMetadata');
// Split the changes into additions and non-additions. Imports only make sense
// for newly-added resources.
const nonAdditions = resourceChanges.filter(([_, dif]) => !dif.isAddition);
const additions = resourceChanges.filter(([_, dif]) => dif.isAddition);
if (nonAdditions.length) {
const offendingResources = nonAdditions.map(([logId, _]) => this.describeResource(logId));
if (allowNonAdditions) {
(0, logging_1.warning)(`Ignoring updated/deleted resources (--force): ${offendingResources.join(', ')}`);
}
else {
throw new Error('No resource updates or deletes are allowed on import operation. Make sure to resolve pending changes ' +
`to existing resources, before attempting an import. Updated/deleted resources: ${offendingResources.join(', ')} (--force to override)`);
}
}
// Resources in the new template, that are not present in the current template, are a potential import candidates
return {
additions: additions.map(([logicalId, resourceDiff]) => ({
logicalId,
resourceDiff,
resourceDefinition: addDefaultDeletionPolicy(this.stack.template?.Resources?.[logicalId] ?? {}),
})),
hasNonAdditions: nonAdditions.length > 0,
};
}
/**
* Get currently deployed template of the given stack (SINGLETON)
*
* @returns Currently deployed CloudFormation template
*/
async currentTemplate() {
if (!this._currentTemplate) {
this._currentTemplate = await this.cfn.readCurrentTemplate(this.stack);
}
return this._currentTemplate;
}
/**
* Return the current template, with the given resources added to it
*/
async currentTemplateWithAdditions(additions) {
const template = await this.currentTemplate();
if (!template.Resources) {
template.Resources = {};
}
for (const add of additions) {
template.Resources[add.logicalId] = add.resourceDefinition;
}
return template;
}
/**
* Get a list of import identifiers for all resource types used in the given
* template that do support the import operation (SINGLETON)
*
* @returns a mapping from a resource type to a list of property names that together identify the resource for import
*/
async resourceIdentifiers() {
const ret = {};
const resourceIdentifierSummaries = await this.cfn.resourceIdentifierSummaries(this.stack);
for (const summary of resourceIdentifierSummaries) {
if ('ResourceType' in summary && summary.ResourceType && 'ResourceIdentifiers' in summary && summary.ResourceIdentifiers) {
ret[summary.ResourceType] = (summary.ResourceIdentifiers ?? [])?.map(x => x.split(','));
}
}
return ret;
}
/**
* Ask for the importable identifier for the given resource
*
* There may be more than one identifier under which a resource can be imported. The `import`
* operation needs exactly one of them.
*
* - If we can get one from the template, we will use one.
* - Otherwise, we will ask the user for one of them.
*/
async askForResourceIdentifier(resourceIdentifiers, chg) {
const resourceName = this.describeResource(chg.logicalId);
// Skip resources that do not support importing
const resourceType = chg.resourceDiff.newResourceType;
if (resourceType === undefined || !(resourceType in resourceIdentifiers)) {
(0, logging_1.warning)(`${resourceName}: unsupported resource type ${resourceType}, skipping import.`);
return undefined;
}
const idPropSets = resourceIdentifiers[resourceType];
// Retain only literal strings: strip potential CFN intrinsics
const resourceProps = Object.fromEntries(Object.entries(chg.resourceDefinition.Properties ?? {})
.filter(([_, v]) => typeof v === 'string'));
// Find property sets that are fully satisfied in the template, ask the user to confirm them
const satisfiedPropSets = idPropSets.filter(ps => ps.every(p => resourceProps[p]));
for (const satisfiedPropSet of satisfiedPropSets) {
const candidateProps = Object.fromEntries(satisfiedPropSet.map(p => [p, resourceProps[p]]));
const displayCandidateProps = fmtdict(candidateProps);
if (await promptly.confirm(`${chalk.blue(resourceName)} (${resourceType}): import with ${chalk.yellow(displayCandidateProps)} (yes/no) [default: yes]? `, { default: 'yes' })) {
return candidateProps;
}
}
// If we got here and the user rejected any available identifiers, then apparently they don't want the resource at all
if (satisfiedPropSets.length > 0) {
(0, logging_1.print)(chalk.grey(`Skipping import of ${resourceName}`));
return undefined;
}
// We cannot auto-import this, ask the user for one of the props
// The only difference between these cases is what we print: for multiple properties, we print a preamble
const prefix = `${chalk.blue(resourceName)} (${resourceType})`;
let preamble;
let promptPattern;
if (idPropSets.length > 1) {
preamble = `${prefix}: enter one of ${idPropSets.map(x => chalk.blue(x.join('+'))).join(', ')} to import (all empty to skip)`;
promptPattern = `${prefix}: enter %`;
}
else {
promptPattern = `${prefix}: enter %`;
}
// Do the input loop here
if (preamble) {
(0, logging_1.print)(preamble);
}
for (const idProps of idPropSets) {
const input = {};
for (const idProp of idProps) {
// If we have a value from the template, use it as default. This will only be a partial
// identifier if present, otherwise we would have done the import already above.
const defaultValue = typeof resourceProps[idProp] ?? '';
const prompt = [
promptPattern.replace(/%/g, chalk.blue(idProp)),
defaultValue
? `[${defaultValue}]`
: '(empty to skip)',
].join(' ') + ':';
const response = await promptly.prompt(prompt, { default: defaultValue, trim: true });
if (!response) {
break;
}
input[idProp] = response;
// Also stick this property into 'resourceProps', so that it may be reused by a subsequent question
// (for a different compound identifier that involves the same property). Just a small UX enhancement.
resourceProps[idProp] = response;
}
// If the user gave inputs for all values, we are complete
if (Object.keys(input).length === idProps.length) {
return input;
}
}
(0, logging_1.print)(chalk.grey(`Skipping import of ${resourceName}`));
return undefined;
}
/**
* Convert the internal "resource mapping" structure to CloudFormation accepted "ResourcesToImport" structure
*/
async makeResourcesToImport(resourceMap) {
return resourceMap.importResources.map(res => ({
LogicalResourceId: res.logicalId,
ResourceType: res.resourceDiff.newResourceType,
ResourceIdentifier: resourceMap.resourceMap[res.logicalId],
}));
}
/**
* Convert CloudFormation logical resource ID to CDK construct tree path
*
* @param logicalId CloudFormation logical ID of the resource (the key in the template's Resources section)
* @returns Forward-slash separated path of the resource in CDK construct tree, e.g. MyStack/MyBucket/Resource
*/
describeResource(logicalId) {
return this.stack.template?.Resources?.[logicalId]?.Metadata?.['aws:cdk:path'] ?? logicalId;
}
}
exports.ResourceImporter = ResourceImporter;
function fmtdict(xs) {
return Object.entries(xs).map(([k, v]) => `${k}=${v}`).join(', ');
}
/**
* Add a default `DeletionPolicy` policy.
* The default value is set to 'Retain', to lower risk of unintentionally
* deleting stateful resources in the process of importing to CDK.
*/
function addDefaultDeletionPolicy(resource) {
if (resource.DeletionPolicy) {
return resource;
}
return {
...resource,
DeletionPolicy: 'Retain',
};
}
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* as cfnDiff from '@aws-cdk/cloudformation-diff';\nimport { ResourceDifference } from '@aws-cdk/cloudformation-diff';\nimport * as cxapi from '@aws-cdk/cx-api';\nimport * as chalk from 'chalk';\nimport * as fs from 'fs-extra';\nimport * as promptly from 'promptly';\nimport { Deployments, DeployStackOptions } from './api/deployments';\nimport { ResourceIdentifierProperties, ResourcesToImport } from './api/util/cloudformation';\nimport { error, print, success, warning } from './logging';\n\n/**\n * Set of parameters that uniquely identify a physical resource of a given type\n * for the import operation, example:\n *\n * ```\n * {\n *   \"AWS::S3::Bucket\": [[\"BucketName\"]],\n *   \"AWS::DynamoDB::GlobalTable\": [[\"TableName\"], [\"TableArn\"], [\"TableStreamArn\"]],\n *   \"AWS::Route53::KeySigningKey\": [[\"HostedZoneId\", \"Name\"]],\n * }\n * ```\n */\nexport type ResourceIdentifiers = { [resourceType: string]: string[][] };\n\n/**\n * Mapping of CDK resources (L1 constructs) to physical resources to be imported\n * in their place, example:\n *\n * ```\n * {\n *   \"MyStack/MyS3Bucket/Resource\": {\n *     \"BucketName\": \"my-manually-created-s3-bucket\"\n *   },\n *   \"MyStack/MyVpc/Resource\": {\n *     \"VpcId\": \"vpc-123456789\"\n *   }\n * }\n * ```\n */\nexport type ResourceMap = { [logicalResource: string]: ResourceIdentifierProperties };\n\n/**\n * Resource importing utility class\n *\n * - Determines the resources added to a template (compared to the deployed version)\n * - Look up the identification information\n *   - Load them from a file, or\n *   - Ask the user, based on information supplied to us by CloudFormation's GetTemplateSummary\n * - Translate the input to a structure expected by CloudFormation, update the template to add the\n *   importable resources, then run an IMPORT changeset.\n */\nexport class ResourceImporter {\n  private _currentTemplate: any;\n\n  constructor(\n    private readonly stack: cxapi.CloudFormationStackArtifact,\n    private readonly cfn: Deployments) { }\n\n  /**\n   * Ask the user for resources to import\n   */\n  public async askForResourceIdentifiers(available: ImportableResource[]): Promise<ImportMap> {\n    const ret: ImportMap = { importResources: [], resourceMap: {} };\n    const resourceIdentifiers = await this.resourceIdentifiers();\n\n    for (const resource of available) {\n      const identifier = await this.askForResourceIdentifier(resourceIdentifiers, resource);\n      if (!identifier) {\n        continue;\n      }\n\n      ret.importResources.push(resource);\n      ret.resourceMap[resource.logicalId] = identifier;\n    }\n\n    return ret;\n  }\n\n  /**\n   * Load the resources to import from a file\n   */\n  public async loadResourceIdentifiers(available: ImportableResource[], filename: string): Promise<ImportMap> {\n    const contents = await fs.readJson(filename);\n\n    const ret: ImportMap = { importResources: [], resourceMap: {} };\n    for (const resource of available) {\n      const descr = this.describeResource(resource.logicalId);\n      const idProps = contents[resource.logicalId];\n      if (idProps) {\n        print('%s: importing using %s', chalk.blue(descr), chalk.blue(fmtdict(idProps)));\n\n        ret.importResources.push(resource);\n        ret.resourceMap[resource.logicalId] = idProps;\n        delete contents[resource.logicalId];\n      } else {\n        print('%s: skipping', chalk.blue(descr));\n      }\n    }\n\n    const unknown = Object.keys(contents);\n    if (unknown.length > 0) {\n      warning(`Unrecognized resource identifiers in mapping file: ${unknown.join(', ')}`);\n    }\n\n    return ret;\n  }\n\n  /**\n   * Based on the provided resource mapping, prepare CFN structures for import (template,\n   * ResourcesToImport structure) and perform the import operation (CloudFormation deployment)\n   *\n   * @param importMap Mapping from CDK construct tree path to physical resource import identifiers\n   * @param options Options to pass to CloudFormation deploy operation\n   */\n  public async importResources(importMap: ImportMap, options: DeployStackOptions) {\n    const resourcesToImport: ResourcesToImport = await this.makeResourcesToImport(importMap);\n    const updatedTemplate = await this.currentTemplateWithAdditions(importMap.importResources);\n\n    try {\n      const result = await this.cfn.deployStack({\n        ...options,\n        overrideTemplate: updatedTemplate,\n        resourcesToImport,\n      });\n\n      const message = result.noOp\n        ? ' ✅  %s (no changes)'\n        : ' ✅  %s';\n\n      success('\\n' + message, options.stack.displayName);\n    } catch (e) {\n      error('\\n ❌  %s failed: %s', chalk.bold(options.stack.displayName), e);\n      throw e;\n    }\n  }\n\n  /**\n   * Perform a diff between the currently running and the new template, ensure that it is valid\n   * for importing and return a list of resources that are being added in the new version\n   *\n   * @return mapping logicalResourceId -> resourceDifference\n   */\n  public async discoverImportableResources(allowNonAdditions = false): Promise<DiscoverImportableResourcesResult> {\n    const currentTemplate = await this.currentTemplate();\n\n    const diff = cfnDiff.diffTemplate(currentTemplate, this.stack.template);\n\n    // Ignore changes to CDKMetadata\n    const resourceChanges = Object.entries(diff.resources.changes)\n      .filter(([logicalId, _]) => logicalId !== 'CDKMetadata');\n\n    // Split the changes into additions and non-additions. Imports only make sense\n    // for newly-added resources.\n    const nonAdditions = resourceChanges.filter(([_, dif]) => !dif.isAddition);\n    const additions = resourceChanges.filter(([_, dif]) => dif.isAddition);\n\n    if (nonAdditions.length) {\n      const offendingResources = nonAdditions.map(([logId, _]) => this.describeResource(logId));\n\n      if (allowNonAdditions) {\n        warning(`Ignoring updated/deleted resources (--force): ${offendingResources.join(', ')}`);\n      } else {\n        throw new Error('No resource updates or deletes are allowed on import operation. Make sure to resolve pending changes ' +\n          `to existing resources, before attempting an import. Updated/deleted resources: ${offendingResources.join(', ')} (--force to override)`);\n      }\n    }\n\n    // Resources in the new template, that are not present in the current template, are a potential import candidates\n    return {\n      additions: additions.map(([logicalId, resourceDiff]) => ({\n        logicalId,\n        resourceDiff,\n        resourceDefinition: addDefaultDeletionPolicy(this.stack.template?.Resources?.[logicalId] ?? {}),\n      })),\n      hasNonAdditions: nonAdditions.length > 0,\n    };\n  }\n\n  /**\n   * Get currently deployed template of the given stack (SINGLETON)\n   *\n   * @returns Currently deployed CloudFormation template\n   */\n  private async currentTemplate(): Promise<any> {\n    if (!this._currentTemplate) {\n      this._currentTemplate = await this.cfn.readCurrentTemplate(this.stack);\n    }\n    return this._currentTemplate;\n  }\n\n  /**\n   * Return the current template, with the given resources added to it\n   */\n  private async currentTemplateWithAdditions(additions: ImportableResource[]): Promise<any> {\n    const template = await this.currentTemplate();\n    if (!template.Resources) {\n      template.Resources = {};\n    }\n\n    for (const add of additions) {\n      template.Resources[add.logicalId] = add.resourceDefinition;\n    }\n\n    return template;\n  }\n\n  /**\n   * Get a list of import identifiers for all resource types used in the given\n   * template that do support the import operation (SINGLETON)\n   *\n   * @returns a mapping from a resource type to a list of property names that together identify the resource for import\n   */\n  private async resourceIdentifiers(): Promise<ResourceIdentifiers> {\n    const ret: ResourceIdentifiers = {};\n    const resourceIdentifierSummaries = await this.cfn.resourceIdentifierSummaries(this.stack);\n    for (const summary of resourceIdentifierSummaries) {\n      if ('ResourceType' in summary && summary.ResourceType && 'ResourceIdentifiers' in summary && summary.ResourceIdentifiers) {\n        ret[summary.ResourceType] = (summary.ResourceIdentifiers ?? [])?.map(x => x.split(','));\n      }\n    }\n    return ret;\n  }\n\n  /**\n   * Ask for the importable identifier for the given resource\n   *\n   * There may be more than one identifier under which a resource can be imported. The `import`\n   * operation needs exactly one of them.\n   *\n   * - If we can get one from the template, we will use one.\n   * - Otherwise, we will ask the user for one of them.\n   */\n  private async askForResourceIdentifier(\n    resourceIdentifiers: ResourceIdentifiers,\n    chg: ImportableResource,\n  ): Promise<ResourceIdentifierProperties | undefined> {\n    const resourceName = this.describeResource(chg.logicalId);\n\n    // Skip resources that do not support importing\n    const resourceType = chg.resourceDiff.newResourceType;\n    if (resourceType === undefined || !(resourceType in resourceIdentifiers)) {\n      warning(`${resourceName}: unsupported resource type ${resourceType}, skipping import.`);\n      return undefined;\n    }\n\n    const idPropSets = resourceIdentifiers[resourceType];\n\n    // Retain only literal strings: strip potential CFN intrinsics\n    const resourceProps = Object.fromEntries(Object.entries(chg.resourceDefinition.Properties ?? {})\n      .filter(([_, v]) => typeof v === 'string')) as Record<string, string>;\n\n    // Find property sets that are fully satisfied in the template, ask the user to confirm them\n    const satisfiedPropSets = idPropSets.filter(ps => ps.every(p => resourceProps[p]));\n    for (const satisfiedPropSet of satisfiedPropSets) {\n      const candidateProps = Object.fromEntries(satisfiedPropSet.map(p => [p, resourceProps[p]]));\n      const displayCandidateProps = fmtdict(candidateProps);\n\n      if (await promptly.confirm(\n        `${chalk.blue(resourceName)} (${resourceType}): import with ${chalk.yellow(displayCandidateProps)} (yes/no) [default: yes]? `,\n        { default: 'yes' },\n      )) {\n        return candidateProps;\n      }\n    }\n\n    // If we got here and the user rejected any available identifiers, then apparently they don't want the resource at all\n    if (satisfiedPropSets.length > 0) {\n      print(chalk.grey(`Skipping import of ${resourceName}`));\n      return undefined;\n    }\n\n    // We cannot auto-import this, ask the user for one of the props\n    // The only difference between these cases is what we print: for multiple properties, we print a preamble\n    const prefix = `${chalk.blue(resourceName)} (${resourceType})`;\n    let preamble;\n    let promptPattern;\n    if (idPropSets.length > 1) {\n      preamble = `${prefix}: enter one of ${idPropSets.map(x => chalk.blue(x.join('+'))).join(', ')} to import (all empty to skip)`;\n      promptPattern = `${prefix}: enter %`;\n    } else {\n      promptPattern = `${prefix}: enter %`;\n    }\n\n    // Do the input loop here\n    if (preamble) {\n      print(preamble);\n    }\n    for (const idProps of idPropSets) {\n      const input: Record<string, string> = {};\n      for (const idProp of idProps) {\n        // If we have a value from the template, use it as default. This will only be a partial\n        // identifier if present, otherwise we would have done the import already above.\n        const defaultValue = typeof resourceProps[idProp] ?? '';\n\n        const prompt = [\n          promptPattern.replace(/%/g, chalk.blue(idProp)),\n          defaultValue\n            ? `[${defaultValue}]`\n            : '(empty to skip)',\n        ].join(' ') + ':';\n        const response = await promptly.prompt(prompt,\n          { default: defaultValue, trim: true },\n        );\n\n        if (!response) {\n          break;\n        }\n\n        input[idProp] = response;\n        // Also stick this property into 'resourceProps', so that it may be reused by a subsequent question\n        // (for a different compound identifier that involves the same property). Just a small UX enhancement.\n        resourceProps[idProp] = response;\n      }\n\n      // If the user gave inputs for all values, we are complete\n      if (Object.keys(input).length === idProps.length) {\n        return input;\n      }\n    }\n\n    print(chalk.grey(`Skipping import of ${resourceName}`));\n    return undefined;\n  }\n\n  /**\n   * Convert the internal \"resource mapping\" structure to CloudFormation accepted \"ResourcesToImport\" structure\n   */\n  private async makeResourcesToImport(resourceMap: ImportMap): Promise<ResourcesToImport> {\n    return resourceMap.importResources.map(res => ({\n      LogicalResourceId: res.logicalId,\n      ResourceType: res.resourceDiff.newResourceType!,\n      ResourceIdentifier: resourceMap.resourceMap[res.logicalId],\n    }));\n  }\n\n  /**\n   * Convert CloudFormation logical resource ID to CDK construct tree path\n   *\n   * @param logicalId CloudFormation logical ID of the resource (the key in the template's Resources section)\n   * @returns Forward-slash separated path of the resource in CDK construct tree, e.g. MyStack/MyBucket/Resource\n   */\n  private describeResource(logicalId: string): string {\n    return this.stack.template?.Resources?.[logicalId]?.Metadata?.['aws:cdk:path'] ?? logicalId;\n  }\n}\n\n/**\n * Information about a resource in the template that is importable\n */\nexport interface ImportableResource {\n  /**\n   * The logical ID of the resource\n   */\n  readonly logicalId: string;\n\n  /**\n   * The resource definition in the new template\n   */\n  readonly resourceDefinition: any;\n\n  /**\n   * The diff as reported by `cloudformation-diff`.\n   */\n  readonly resourceDiff: ResourceDifference;\n}\n\n/**\n * The information necessary to execute an import operation\n */\nexport interface ImportMap {\n  /**\n   * Mapping logical IDs to physical names\n   */\n  readonly resourceMap: ResourceMap;\n\n  /**\n   * The selection of resources we are actually importing\n   *\n   * For each of the resources in this list, there is a corresponding entry in\n   * the `resourceMap` map.\n   */\n  readonly importResources: ImportableResource[];\n}\n\nfunction fmtdict<A>(xs: Record<string, A>) {\n  return Object.entries(xs).map(([k, v]) => `${k}=${v}`).join(', ');\n}\n\n/**\n * Add a default `DeletionPolicy` policy.\n * The default value is set to 'Retain', to lower risk of unintentionally\n * deleting stateful resources in the process of importing to CDK.\n */\nfunction addDefaultDeletionPolicy(resource: any): any {\n  if (resource.DeletionPolicy) { return resource; }\n\n  return {\n    ...resource,\n    DeletionPolicy: 'Retain',\n  };\n}\n\nexport interface DiscoverImportableResourcesResult {\n  readonly additions: ImportableResource[];\n  readonly hasNonAdditions: boolean;\n}\n"]}