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Web Services"},"license":"Apache-2.0","homepage":"https://github.com/aws-cloudformation/cloudformation-validate#readme","keywords":["aws","amazon","aws-cloudformation","cloudformation","iac","infrastructure-as-code","lint","template","validate"],"repository":{"url":"git+https://github.com/aws-cloudformation/cloudformation-validate.git","type":"git"},"description":"Fast, offline, embeddable validation for AWS CloudFormation templates","maintainers":[{"name":"aws-cfn-dev-ex-npm","email":"aws-cfn-dev-ex+npm@amazon.com"}],"readme":"# AWS CloudFormation Validate\n\nValidate AWS CloudFormation templates from JavaScript or TypeScript and catch schema violations, semantic errors,\nsecurity risks, and best-practice findings before deployment - in your editor, build, service, or CI.\n\n- **Offline** - all rules and CloudFormation resource schemas are bundled; nothing is fetched at runtime and no AWS\n credentials are needed.\n- **Fast** - engines and schemas compile once and are reused across validations; typical templates validate in under a\n second.\n- **Self-contained** - the WebAssembly module is bundled in the package; there are no native dependencies.\n\nAll types are exported from the `@aws/cloudformation-validate` package.\n\n## Installation\n\nAvailable on [npm](https://www.npmjs.com/package/@aws/cloudformation-validate) as `@aws/cloudformation-validate`.\n\n```bash\nnpm install @aws/cloudformation-validate\n```\n\nRequires Node.js 20 or later. The package has no runtime dependencies.\n\n## Quick start\n\nEngines, models, and validators hold off-heap memory - call `.free()` when done with each object:\n\n```typescript\nimport { CompositeEngine, TemplateFile } from \"@aws/cloudformation-validate\";\n\nconst engine = new CompositeEngine();\ntry {\n const report = engine.validateTemplate(new TemplateFile(\"template.yaml\"));\n for (const d of report.diagnostics) {\n console.log(`[${d.severity}] ${d.ruleId}: ${d.message}`);\n }\n} finally {\n engine.free();\n}\n```\n\nEach diagnostic identifies the rule, severity, affected entity and property, and source location - see\n[Diagnostic](#diagnostic). A complete, runnable project is in\n[examples](https://github.com/aws-cloudformation/cloudformation-validate/tree/main/src/bindings-wasm/examples).\n\nEngines are expensive to construct (rules compile once) and cheap to reuse - create one engine and validate many\ntemplates. Every fallible call throws on failure - the thrown value is the error message string from the validation\ncore, so handle it with `catch (error) { String(error) }`; internal panics are caught at the WASM boundary and surface\nthe same way, never a process abort. `version()` returns the version of the bundled validation core.\n\nA template is passed as a `Template` - either a `TemplateFile`, which wraps a filesystem path the engine reads, or a\n`TemplateContent`, which carries template text or bytes already in memory so nothing is read from disk. The file path\nor the content `name` labels the report and its diagnostics; an omitted `TemplateContent` name defaults to\n`\"template\"` (`DEFAULT_TEMPLATE_NAME`).\n\n```typescript\ntype Template = TemplateFile | TemplateContent;\n\nclass TemplateFile {\n constructor(path: string); // template read from disk\n}\n\nclass TemplateContent {\n constructor(content: string | Uint8Array, name?: string); // in-memory UTF-8 text or raw bytes\n}\n\nconst fromDisk = engine.validateTemplate(new TemplateFile(\"template.yaml\"));\nconst fromMemory = engine.validateTemplate(new TemplateContent(\"Resources: {}\", \"inline.yaml\"));\n```\n\n`TemplateModel` and `SchemaValidator.validate` accept the same `Template` union.\n\n## Engine\n\n`RegoEngine` and `CelEngine` both implement the `Engine` interface and are interchangeable - they produce identical\ndiagnostics for the same template and config. `CompositeEngine` implements the same interface and layers custom Rego,\nCEL, and Guard rules on top of the built-in rules - see [CompositeEngine](#compositeengine).\n\n### `Engine` interface\n\n```typescript\ninterface Engine {\n validateTemplate(template: Template, config?: ValidateConfig): ValidationReport;\n validateAwsCliCommand(request: AwsCliCommand): AwsCliCommandValidation;\n listRules(): RuleInfo[];\n engineName(): string;\n free(): void;\n}\n```\n\n| Method | Returns | Description |\n|---------------------------------------|---------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `validateTemplate(template, config?)` | `ValidationReport` | Validates the template and returns a report. `config.detailLevel` (default `DETAILED`) selects how much per-diagnostic context is populated: `DETAILED` adds documentation URLs, rule descriptions, phase tags, and `ViolationContext`; `STANDARD` leaves those enrichment fields absent |\n| `validateAwsCliCommand(request)` | `AwsCliCommandValidation` | Models an AWS CLI command as CloudFormation resource state and validates it - see [AWS CLI command validation](#aws-cli-command-validation) |\n| `listRules()` | `RuleInfo[]` | Returns metadata for every built-in and loaded custom rule |\n| `engineName()` | `string` | `\"rego\"`, `\"cel\"`, or `\"composite\"` |\n| `free()` | `void` | Releases the engine's off-heap memory; the engine must not be used afterwards |\n\n### `EngineConfig`\n\nPassed to the constructor. All fields are optional: the rule lists default to empty and an omitted\n`schemaValidatorConfig` uses only the bundled schemas.\n\n```typescript\ninterface EngineConfig {\n customRules?: RuleSource[]; // engine-native rules (Rego for RegoEngine, CEL for CelEngine)\n guardRules?: RuleSource[]; // CloudFormation Guard DSL rules - evaluated by the Guard evaluator\n schemaValidatorConfig?: SchemaValidatorConfig; // additional resource provider schemas\n}\n\ninterface SchemaValidatorConfig {\n additionalSchemas?: SchemaSource[]; // resource provider schemas merged over the bundled schemas\n}\n\ntype RuleSource = ExternalRuleSource | RuleFile;\ntype SchemaSource = AdditionalSchemaSource | SchemaFile;\n\ninterface ExternalRuleSource {\n name: string; // identifier shown in diagnostics (e.g. file path)\n content: string; // full rule source text\n}\n\ninterface AdditionalSchemaSource {\n typeName?: string; // omit to use the typeName inside the schema JSON\n schema: string; // complete resource provider schema JSON\n}\n\nclass RuleFile {\n constructor(path: string); // rule file read from disk; the path becomes the rule source name\n}\n\nclass SchemaFile {\n constructor(path: string, typeName?: string); // schema file; typeName defaults to the value inside the JSON\n}\n```\n\n| Field | Default | Description |\n|-------------------------|-------------|-----------------------------------------------------------------------------------------------|\n| `customRules` | `[]` | Engine-native rules: Rego source for `RegoEngine`, CEL JSON for `CelEngine` |\n| `guardRules` | `[]` | CloudFormation Guard DSL rules, evaluated by the Guard evaluator identically in every engine |\n| `schemaValidatorConfig` | `undefined` | Optional `SchemaValidatorConfig` whose `additionalSchemas` are merged over the bundled schemas |\n\nEach rule is an `ExternalRuleSource` - `name` identifies the rule in diagnostics and `content` is the full rule source\ntext. Pass a `RuleFile` to load one from disk (the same pattern as `TemplateFile` for templates), or an\n`ExternalRuleSource` when you already have the rule text in memory. Each additional schema is an\n`AdditionalSchemaSource` - a complete resource provider schema JSON plus an optional `typeName` that may be omitted when\nthe schema JSON contains its own `typeName`; `SchemaFile` loads one from disk. Additional schemas extend the bundled\nschemas or register resource types CloudFormation has not published yet; a malformed, contradictory, or unsupported\nschema fails engine construction rather than silently weakening validation. Guard rules are evaluated by the\nCloudFormation Guard evaluator itself against the template as written, so every engine reports exactly what `cfn-guard\nvalidate` reports; a Guard file that does not parse also fails engine construction. The two forms can be mixed freely:\n\n```typescript\nimport { CelEngine, RuleFile, SchemaFile } from \"@aws/cloudformation-validate\";\n\nconst engine = new CelEngine({\n customRules: [new RuleFile(\"rules/s3_encryption.json\")],\n guardRules: [new RuleFile(\"rules/compliance.guard\")],\n schemaValidatorConfig: {\n additionalSchemas: [new SchemaFile(\"schemas/aws-lambda-function.json\")],\n },\n});\n```\n\nSee [Custom Rules](../CUSTOM_RULES.md) for the Rego, CEL, and Guard rule formats and\n[Additional Resource Provider Schemas](../validation-engine/API.md#additional-resource-provider-schemas) for the schema\nmerge model.\n\n### `CompositeEngine`\n\n`CompositeEngine` implements the same `Engine` interface but takes a `CompositeEngineConfig`. It evaluates every\nbuilt-in rule with a fixed built-in CEL evaluator and layers the caller-supplied custom rules on top: custom CEL and\nGuard rules run alongside that built-in engine, while custom Rego rules run in a separate external engine that is\nconstructed only when Rego rules are supplied. With no custom rules it produces the same built-in diagnostics as\n`RegoEngine` and `CelEngine`, and `engineName()` returns `\"composite\"`. Because the composite fixes which engine owns\nthe built-ins, the config has no `customRules` field - it carries only the custom rules layered on top:\n\n```typescript\ninterface CompositeEngineConfig {\n regoRules?: RuleSource[]; // custom Rego rules, run by the external engine\n celRules?: RuleSource[]; // custom CEL rules, run by the built-in engine\n guardRules?: RuleSource[]; // CloudFormation Guard DSL rules, evaluated alongside the built-in engine\n schemaValidatorConfig?: SchemaValidatorConfig; // additional resource provider schemas, observed by both inner engines\n}\n```\n\n| Field | Default | Description |\n|-------------------------|-------------|--------------------------------------------------------------------------------------------------|\n| `regoRules` | `[]` | Custom Rego rules layered on top of the built-in rules, run by the external engine |\n| `celRules` | `[]` | Custom CEL rules layered on top of the built-in rules, run by the built-in engine |\n| `guardRules` | `[]` | CloudFormation Guard DSL rules layered on top of the built-in rules, evaluated alongside the built-in engine |\n| `schemaValidatorConfig` | `undefined` | Optional `SchemaValidatorConfig`, observed by both inner engines |\n\n```typescript\nimport { CompositeEngine, RuleFile, TemplateFile } from \"@aws/cloudformation-validate\";\n\nconst engine = new CompositeEngine({\n regoRules: [new RuleFile(\"rules/s3_naming.rego\")],\n guardRules: [new RuleFile(\"rules/compliance.guard\")],\n});\ntry {\n const report = engine.validateTemplate(new TemplateFile(\"template.yaml\"));\n} finally {\n engine.free();\n}\n```\n\n## ValidateConfig\n\nControls filtering, detail, severity, parameter overrides, and behavior for one validation call. All fields have\ndefaults - omitting the config or passing `{}` uses them.\n\n```typescript\nconst report = engine.validateTemplate(new TemplateFile(\"template.yaml\"), {\n exclude: { ids: [\"I1002\"] },\n severityLevel: \"WARN\",\n});\n```\n\n```typescript\ninterface ValidateConfig {\n include?: RuleFilterConfig;\n exclude?: RuleFilterConfig;\n detailLevel?: DetailLevel;\n severityLevel?: Severity;\n parameterOverrides?: Record;\n pseudoParameterOverrides?: PseudoParameterOverrides;\n strict?: boolean;\n disableBuiltinRules?: boolean;\n}\n```\n\n| Field | Default | Description |\n|----------------------------|-------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `include` | `{}` (all rules) | When set, only matching rules produce diagnostics. Empty means include everything. |\n| `exclude` | `{}` (nothing excluded) | Matching rules are suppressed. Applied after `include`. |\n| `detailLevel` | `\"DETAILED\"` | Per-diagnostic context. `\"DETAILED\"` populates documentation URLs, rule descriptions, phase tags, and `ViolationContext`; `\"STANDARD\"` leaves those enrichment fields absent. |\n| `severityLevel` | `\"INFO\"` | Minimum severity threshold. Diagnostics below this level are dropped. Values: `DEBUG`, `INFO`, `WARN`, `ERROR`, `FATAL`. |\n| `parameterOverrides` | `{}` | Override template parameter values during resolution. Keys are parameter logical IDs. |\n| `pseudoParameterOverrides` | all `undefined` | Override CloudFormation pseudo-parameters (`AWS::AccountId`, `AWS::Region`, etc.). |\n| `strict` | `false` | When `true`, `WARN`-severity diagnostics are upgraded to `ERROR`. |\n| `disableBuiltinRules` | `false` | When `true`, all built-in rules (schema validation, Step Functions, engine rules) are skipped; only custom and Guard rules are evaluated. |\n\n### RuleFilterConfig\n\nBoth `include` and `exclude` use this structure. All fields are additive - a rule matches if it hits any criterion.\n\n```typescript\ninterface RuleFilterConfig {\n ids?: string[]; // exact rule IDs, e.g. [\"E3012\", \"W3010\"]\n categories?: string[]; // category names, e.g. [\"security\", \"best_practices\"]\n idRanges?: IdRange[]; // numeric ranges, e.g. { prefix: \"E\", start: 3000, end: 3099 }\n idPatterns?: string[]; // regex patterns matched against rule IDs\n resourceIds?: ResourceIdFilter[]; // a rule (or every rule) on a logical resource ID\n logicalIds?: LogicalIdFilter[]; // a rule (or every rule) on a named template entity\n resourceTypes?: ResourceTypeFilter[]; // a rule (or every rule) on a resource type\n services?: ServiceFilter[]; // a rule (or every rule) on a service, e.g. \"AWS::AutoScaling\"\n}\n\n// resourceIds / logicalIds / resourceTypes / services each carry an optional ruleId:\n// set it to scope the filter to one rule, or omit it for every rule on the target.\ninterface ResourceIdFilter { ruleId?: string; resourceId: string; }\ninterface LogicalIdFilter { ruleId?: string; logicalId: string; entityType?: EntityType; }\ninterface ResourceTypeFilter { ruleId?: string; resourceType: string; }\ninterface ServiceFilter { ruleId?: string; service: string; }\n```\n\nThe `service` is matched verbatim against the `service-provider::service-name` prefix of the resource type - its first\ntwo `::`-delimited segments (e.g. `AWS::AutoScaling` in `AWS::AutoScaling::LaunchConfiguration`).\n\nThe `resourceIds` dimension matches only diagnostics attributed to a resource; `logicalIds` additionally matches\ndiagnostics on parameters, outputs, mappings, conditions, and template rules (for resource diagnostics the two carry\nthe same value). An optional `entityType` scopes a `LogicalIdFilter` to entities of one type, so `MyThing` as a\n`\"Parameter\"` is matched without touching a same-named entity of another type.\n\n### PseudoParameterOverrides\n\nOverride CloudFormation pseudo-parameters used during intrinsic function resolution. All fields are optional - when\n`undefined`, the engine uses built-in defaults (e.g. region defaults to `us-east-1`).\n\n```typescript\ninterface PseudoParameterOverrides {\n accountId?: string; // AWS::AccountId\n notificationArns?: string; // AWS::NotificationARNs\n partition?: string; // AWS::Partition\n region?: string; // AWS::Region (default: \"us-east-1\")\n stackId?: string; // AWS::StackId\n stackName?: string; // AWS::StackName\n urlSuffix?: string; // AWS::URLSuffix\n}\n```\n\n## TemplateModel\n\nParses a template into the resolved `SemanticModel` for direct inspection - the same model the engines evaluate rules\nagainst.\n\n```typescript\nconst model = new TemplateModel(new TemplateFile(\"template.yaml\"));\nconst inMemory = new TemplateModel(new TemplateContent(\"Resources: {}\"));\n```\n\n| Method | Returns | Description |\n|------------------------|------------------------------------|-------------------------------------------------------------------------------------------------|\n| `resources()` | `Record` | All resources with resolved property values |\n| `parameters()` | `Record` | Parameter definitions with types, defaults, constraints |\n| `outputs()` | `Record` | Outputs with resolved values and export names |\n| `conditions()` | `string[]` | Condition names defined in the template |\n| `transforms()` | `string[]` | Transform declarations (e.g. `AWS::Serverless-2016-10-31`) |\n| `formatVersion()` | `string \\| undefined` | `AWSTemplateFormatVersion` value |\n| `description()` | `string \\| undefined` | Template description |\n| `toDiagnosticModel()` | `DiagnosticModel` | Full diagnostic model including reference graph, condition implications, and resolution sources |\n| `sourceLocation(path)` | `SourceSpan \\| null` | Source line/column span for a JSON path (e.g. `Resources/MyBucket/Properties/BucketName`) |\n| `free()` | `void` | Releases the model's off-heap memory; the model must not be used afterwards |\n\n## SchemaValidator\n\nRuns schema validation independently from the rule engines. Checks each resource against the compiled CloudFormation\nprovider schemas and produces `FATAL`-severity diagnostics for structural violations. The optional constructor argument\nis the same `SchemaValidatorConfig` accepted by `EngineConfig`; omitting it uses only the bundled schemas.\n\n```typescript\nconst validator = new SchemaValidator();\ntry {\n const diagnostics = validator.validate(new TemplateFile(\"template.yaml\"), \"us-east-1\");\n} finally {\n validator.free();\n}\n```\n\n| Method | Returns | Description |\n|--------------------------------|-------------------|------------------------------------------------------------------------------------------------------------------|\n| `new SchemaValidator(config?)` | `SchemaValidator` | Constructs a validator; an omitted `SchemaValidatorConfig` uses only the bundled schemas |\n| `validate(template, region?)` | `Diagnostic[]` | Schema diagnostics for a `Template` at `STANDARD` detail - the enrichment fields are absent. `region` defaults to `\"us-east-1\"`. |\n| `listRules()` | `RuleInfo[]` | Schema rule metadata |\n| `schemaCount()` | `number` | Number of compiled provider schemas |\n| `free()` | `void` | Releases the validator's off-heap memory; the validator must not be used afterwards |\n\n## AWS CLI command validation\n\n`validateAwsCliCommand` models an AWS CLI (or SDK) API call as CloudFormation resource state and validates it offline\nbefore it is sent. It classifies the operation, maps it to a CloudFormation resource type through a closed, generated\nadapter catalog, synthesizes a template from the supplied parameters, and runs the normal template pipeline on it. A\n`TemplateBody` parameter of a CloudFormation operation is validated as-is. Any request that cannot be modeled exactly -\nan unregistered operation, a parameter without a lossless property mapping, or a value outside a CloudFormation\nconstraint the API itself does not enforce - is skipped with a reason, never guessed.\n\n```typescript\nimport { AwsCliCommand, CompositeEngine } from \"@aws/cloudformation-validate\";\n\nconst engine = new CompositeEngine();\ntry {\n const request = new AwsCliCommand(\"s3\", \"CreateBucket\", { Bucket: \"example-bucket\" });\n const validation = engine.validateAwsCliCommand(request);\n if (validation.status === \"VALIDATED\") {\n for (const d of validation.report!.diagnostics) {\n console.log(`[${d.severity}] ${d.ruleId}: ${d.message}`);\n }\n } else {\n console.log(`skipped (${validation.operationKind}): ${validation.reason}`);\n }\n} finally {\n engine.free();\n}\n```\n\n```typescript\nclass AwsCliCommand {\n constructor(\n serviceName: string, // canonical botocore service name, e.g. \"s3\" or \"cloudformation\"\n operationName: string, // API operation name, e.g. \"CreateBucket\"\n parameters: Record, // request parameters (a plain object with string keys)\n options?: AwsCliCommandOptions,\n );\n}\n\ninterface AwsCliCommandOptions {\n servicePrefix?: string; // signing prefix; context only\n httpMethod?: string; // classification hint (\"GET\"/\"HEAD\"/\"DELETE\") for unrecognized verbs\n isReadOnly?: boolean; // true classifies the operation as READ_ONLY\n}\n```\n\n- `serviceName` is matched case-insensitively. Signing names, endpoint aliases, and ARN prefixes are never resolved;\n translate an SDK's service identity first.\n- `parameters` accepts nested plain objects and arrays, strings, numbers, `bigint`, booleans, `null`, `Uint8Array`,\n and `Date` (serialized as ISO 8601). Any other value is carried as an explicit unsupported marker, and because\n synthesis is all-or-nothing the request is then skipped with a reason naming the offending parameter - no parameter\n is ever silently dropped.\n\nThe result is an `AwsCliCommandValidation`:\n\n| Field | Description |\n|------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `operationKind` | `AwsCliOperationKind`: `\"READ_ONLY\"`, `\"CLOUD_FORMATION_CREATE\"`, `\"CLOUD_FORMATION_UPDATE\"`, `\"CLOUD_FORMATION_DELETE\"`, `\"DATA_PLANE_MUTATION\"`, or `\"UNMAPPED_MUTATION\"` |\n| `status` | `AwsCliCommandValidationStatus`: `\"VALIDATED\"` when the modeled template ran through the pipeline, `\"SKIPPED\"` otherwise |\n| `templateSource` | `AwsCliTemplateSource \\| null`: `\"TEMPLATE_BODY\"`, `\"CLOUD_CONTROL_DESIRED_STATE\"`, `\"SYNTHESIZED_CREATE\"`, or `\"SYNTHESIZED_UPDATE\"`; `null` when skipped |\n| `resourceTypes` | `string[]` - CloudFormation resource types the operation maps to |\n| `reason` | `string` - why the request was validated or skipped |\n| `report` | `ValidationReport \\| null` - present when `\"VALIDATED\"`. The configuration is fixed: `STANDARD` detail level and a `WARN` severity floor |\n| `template` | `Uint8Array \\| null` - the exact template bytes that were validated (the caller's `TemplateBody` unchanged, or the synthesized JSON); `null` when skipped |\n\nThe full contract - the adapter catalog, all-or-nothing mapping, and which rules are dropped for synthesized state -\nis documented in [validation-engine/API.md](../validation-engine/API.md#validating-an-aws-cli-command).\n\n## Report Types\n\n### ValidationReport\n\n`validateTemplate` always returns a `ValidationReport` - a template syntax failure is returned as a report with\nstatus `\"ERROR\"` and an `F1101` diagnostic; only infrastructure or engine failures throw:\n\n```typescript\ninterface ValidationReport {\n filePath: string;\n status: \"OK\" | \"ANALYSIS_INCOMPLETE\" | \"ERROR\"; // ERROR is a pipeline failure; ANALYSIS_INCOMPLETE may omit findings\n version: string;\n metadata: ReportMetadata;\n performance: PerformanceMetrics;\n diagnostics: Diagnostic[];\n}\n```\n\nEvery finding is a `Diagnostic` (see [Diagnostic](#diagnostic)). Its enrichment fields - `documentationUrl`,\n`ruleDescription`, `phase` (`PARSE` | `SCHEMA` | `LINT`), and `context` (`ViolationContext` with `actualValue`,\n`expectedConstraint`, `resolutionSource`, etc.) - are populated only at `detailLevel` `\"DETAILED\"` (the default);\nvalidating at `\"STANDARD\"` leaves them absent, keeping the base diagnostic fields.\n\n`metadata` carries the summary counts, the number of suppressed diagnostics, the resources scanned and rules\nevaluated, the strict flag and severity threshold used, and optional budget-exhaustion records. Each budget-exhaustion\nrecord retains a stable machine-readable kind and also includes a human-readable description sentence, the numeric\nlimit, and whether that specific exhaustion makes analysis incomplete. `requiredPropertyCombinations` is context-only,\nso its `analysisIncomplete` value is `false` and the report can remain `\"OK\"`.\n\n### Diagnostic\n\n```typescript\ninterface Diagnostic {\n ruleId: string; // e.g. \"E3012\", \"F1001\", \"W3010\"\n severity: Severity; // \"FATAL\" | \"ERROR\" | \"WARN\" | \"INFO\" | \"DEBUG\"\n message: string;\n source: RuleOrigin; // \"SCHEMA\" | \"CFN_LINT\" | \"ENGINE\" | \"CUSTOM\" | \"GUARD\"\n entity?: Entity; // the named template entity the finding targets, if any\n propertyPath?: string; // e.g. \"Properties.BucketName\", or section-absolute like \"Parameters/MyParam/Type\"\n suggestedFix?: string;\n category?: string;\n startLine?: number;\n startColumn?: number;\n endLine?: number;\n endColumn?: number;\n relatedResources?: RelatedResource[];\n conditionScenario?: Record; // condition truth assignment that triggers this diagnostic\n // Enrichment fields: populated at detailLevel \"DETAILED\" (the default), absent at \"STANDARD\".\n documentationUrl?: string;\n ruleDescription?: string;\n phase?: \"PARSE\" | \"SCHEMA\" | \"LINT\"; // pipeline stage that produced the finding\n context?: ViolationContext; // actualValue, expectedConstraint, resolutionSource, etc.\n}\n\n// The named template entity a diagnostic is attributed to. The entity type is the\n// singular form of the top-level template section the entity is declared in.\ninterface Entity {\n logicalId: string; // logical ID as declared in the template\n entityType: EntityType;\n resourceType?: string; // CloudFormation type, when the entity is a resource whose type is known\n}\n\ntype EntityType = \"Resource\" | \"Parameter\" | \"Output\" | \"Mapping\" | \"Metadata\"\n | \"Rule\" | \"Condition\" | \"Transform\" | \"FormatVersion\" | \"Description\";\n```\n\n`Severity`, `RuleOrigin`, and `DetailLevel` are string-literal union types (`\"WARN\"`, `\"GUARD\"`, `\"STANDARD\"`, ...), as\nis the report `status` (`\"OK\"`, `\"ANALYSIS_INCOMPLETE\"`, `\"ERROR\"`).\n","readmeFilename":"README.md"}