Erster Docker-Stand

_node_modules/effect/src/JSONSchema.ts

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+/**
+ * @since 3.10.0
+ */
+
+import * as Arr from "./Array.js"
+import * as errors_ from "./internal/schema/errors.js"
+import * as schemaId_ from "./internal/schema/schemaId.js"
+import * as Option from "./Option.js"
+import * as ParseResult from "./ParseResult.js"
+import * as Predicate from "./Predicate.js"
+import * as Record from "./Record.js"
+import type * as Schema from "./Schema.js"
+import * as AST from "./SchemaAST.js"
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchemaAnnotations {
+  title?: string
+  description?: string
+  default?: unknown
+  examples?: Array<unknown>
+}
+
+/**
+ * @category model
+ * @since 3.11.5
+ */
+export interface JsonSchema7Never extends JsonSchemaAnnotations {
+  $id: "/schemas/never"
+  not: {}
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Any extends JsonSchemaAnnotations {
+  $id: "/schemas/any"
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Unknown extends JsonSchemaAnnotations {
+  $id: "/schemas/unknown"
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Void extends JsonSchemaAnnotations {
+  $id: "/schemas/void"
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7object extends JsonSchemaAnnotations {
+  $id: "/schemas/object"
+  anyOf: [
+    { type: "object" },
+    { type: "array" }
+  ]
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7empty extends JsonSchemaAnnotations {
+  $id: "/schemas/%7B%7D"
+  anyOf: [
+    { type: "object" },
+    { type: "array" }
+  ]
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Ref extends JsonSchemaAnnotations {
+  $ref: string
+}
+
+/**
+ * @category model
+ * @since 3.11.7
+ */
+export interface JsonSchema7Null extends JsonSchemaAnnotations {
+  type: "null"
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7String extends JsonSchemaAnnotations {
+  type: "string"
+  minLength?: number
+  maxLength?: number
+  pattern?: string
+  format?: string
+  contentMediaType?: string
+  allOf?: Array<{
+    minLength?: number
+    maxLength?: number
+    pattern?: string
+  }>
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Numeric extends JsonSchemaAnnotations {
+  minimum?: number
+  exclusiveMinimum?: number
+  maximum?: number
+  exclusiveMaximum?: number
+  multipleOf?: number
+  allOf?: Array<{
+    minimum?: number
+    exclusiveMinimum?: number
+    maximum?: number
+    exclusiveMaximum?: number
+    multipleOf?: number
+  }>
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Number extends JsonSchema7Numeric {
+  type: "number"
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Integer extends JsonSchema7Numeric {
+  type: "integer"
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Boolean extends JsonSchemaAnnotations {
+  type: "boolean"
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Array extends JsonSchemaAnnotations {
+  type: "array"
+  items?: JsonSchema7 | Array<JsonSchema7>
+  minItems?: number
+  maxItems?: number
+  additionalItems?: JsonSchema7 | boolean
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Enum extends JsonSchemaAnnotations {
+  type?: "string" | "number" | "boolean"
+  enum: Array<string | number | boolean>
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Enums extends JsonSchemaAnnotations {
+  $comment: "/schemas/enums"
+  anyOf: Array<{
+    type: "string" | "number"
+    title: string
+    enum: [string | number]
+  }>
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7AnyOf extends JsonSchemaAnnotations {
+  anyOf: Array<JsonSchema7>
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export interface JsonSchema7Object extends JsonSchemaAnnotations {
+  type: "object"
+  required: Array<string>
+  properties: Record<string, JsonSchema7>
+  additionalProperties?: boolean | JsonSchema7
+  patternProperties?: Record<string, JsonSchema7>
+  propertyNames?: JsonSchema7
+}
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export type JsonSchema7 =
+  | JsonSchema7Never
+  | JsonSchema7Any
+  | JsonSchema7Unknown
+  | JsonSchema7Void
+  | JsonSchema7object
+  | JsonSchema7empty
+  | JsonSchema7Ref
+  | JsonSchema7Null
+  | JsonSchema7String
+  | JsonSchema7Number
+  | JsonSchema7Integer
+  | JsonSchema7Boolean
+  | JsonSchema7Array
+  | JsonSchema7Enum
+  | JsonSchema7Enums
+  | JsonSchema7AnyOf
+  | JsonSchema7Object
+
+/**
+ * @category model
+ * @since 3.10.0
+ */
+export type JsonSchema7Root = JsonSchema7 & {
+  $schema?: string
+  $defs?: Record<string, JsonSchema7>
+}
+
+/**
+ * @category encoding
+ * @since 3.10.0
+ */
+export const make = <A, I, R>(schema: Schema.Schema<A, I, R>): JsonSchema7Root => {
+  const definitions: Record<string, any> = {}
+  const ast = AST.isTransformation(schema.ast) && isParseJsonTransformation(schema.ast.from)
+    // Special case top level `parseJson` transformations
+    ? schema.ast.to
+    : schema.ast
+  const jsonSchema = fromAST(ast, {
+    definitions
+  })
+  const out: JsonSchema7Root = {
+    $schema,
+    $defs: {},
+    ...jsonSchema
+  }
+  if (Record.isEmptyRecord(definitions)) {
+    delete out.$defs
+  } else {
+    out.$defs = definitions
+  }
+  return out
+}
+
+type Target = "jsonSchema7" | "jsonSchema2019-09" | "openApi3.1"
+
+type TopLevelReferenceStrategy = "skip" | "keep"
+
+type AdditionalPropertiesStrategy = "allow" | "strict"
+
+/**
+ * Returns a JSON Schema with additional options and definitions.
+ *
+ * **Warning**
+ *
+ * This function is experimental and subject to change.
+ *
+ * **Options**
+ *
+ * - `definitions`: A record of definitions that are included in the schema.
+ * - `definitionPath`: The path to the definitions within the schema (defaults
+ *   to "#/$defs/").
+ * - `target`: Which spec to target. Possible values are:
+ *   - `'jsonSchema7'`: JSON Schema draft-07 (default behavior).
+ *   - `'jsonSchema2019-09'`: JSON Schema draft-2019-09.
+ *   - `'openApi3.1'`: OpenAPI 3.1.
+ * - `topLevelReferenceStrategy`: Controls the handling of the top-level
+ *   reference. Possible values are:
+ *   - `"keep"`: Keep the top-level reference (default behavior).
+ *   - `"skip"`: Skip the top-level reference.
+ * - `additionalPropertiesStrategy`: Controls the handling of additional properties. Possible values are:
+ *   - `"strict"`: Disallow additional properties (default behavior).
+ *   - `"allow"`: Allow additional properties.
+ *
+ * @category encoding
+ * @since 3.11.5
+ * @experimental
+ */
+export const fromAST = (ast: AST.AST, options: {
+  readonly definitions: Record<string, JsonSchema7>
+  readonly definitionPath?: string | undefined
+  readonly target?: Target | undefined
+  readonly topLevelReferenceStrategy?: TopLevelReferenceStrategy | undefined
+  readonly additionalPropertiesStrategy?: AdditionalPropertiesStrategy | undefined
+}): JsonSchema7 => {
+  const definitionPath = options.definitionPath ?? "#/$defs/"
+  const getRef = (id: string) => definitionPath + id
+  const target = options.target ?? "jsonSchema7"
+  const topLevelReferenceStrategy = options.topLevelReferenceStrategy ?? "keep"
+  const additionalPropertiesStrategy = options.additionalPropertiesStrategy ?? "strict"
+  return go(
+    ast,
+    options.definitions,
+    "handle-identifier",
+    [],
+    {
+      getRef,
+      target,
+      topLevelReferenceStrategy,
+      additionalPropertiesStrategy
+    },
+    "handle-annotation",
+    "handle-errors"
+  )
+}
+
+const constNever: JsonSchema7Never = {
+  $id: "/schemas/never",
+  not: {}
+}
+
+const constAny: JsonSchema7Any = {
+  $id: "/schemas/any"
+}
+
+const constUnknown: JsonSchema7Unknown = {
+  $id: "/schemas/unknown"
+}
+
+const constVoid: JsonSchema7Void = {
+  $id: "/schemas/void"
+}
+
+const constObject: JsonSchema7object = {
+  $id: "/schemas/object",
+  "anyOf": [
+    { "type": "object" },
+    { "type": "array" }
+  ]
+}
+
+const constEmptyStruct: JsonSchema7empty = {
+  $id: "/schemas/%7B%7D",
+  "anyOf": [
+    { "type": "object" },
+    { "type": "array" }
+  ]
+}
+
+const $schema = "http://json-schema.org/draft-07/schema#"
+
+function getRawDescription(annotated: AST.Annotated | undefined): string | undefined {
+  if (annotated !== undefined) return Option.getOrUndefined(AST.getDescriptionAnnotation(annotated))
+}
+
+function getRawTitle(annotated: AST.Annotated | undefined): string | undefined {
+  if (annotated !== undefined) return Option.getOrUndefined(AST.getTitleAnnotation(annotated))
+}
+
+function getRawDefault(annotated: AST.Annotated | undefined): Option.Option<unknown> {
+  if (annotated !== undefined) return AST.getDefaultAnnotation(annotated)
+  return Option.none()
+}
+
+function encodeDefault(ast: AST.AST, def: unknown): Option.Option<unknown> {
+  const getOption = ParseResult.getOption(ast, false)
+  return getOption(def)
+}
+
+function getRawExamples(annotated: AST.Annotated | undefined): ReadonlyArray<unknown> | undefined {
+  if (annotated !== undefined) return Option.getOrUndefined(AST.getExamplesAnnotation(annotated))
+}
+
+function encodeExamples(ast: AST.AST, examples: ReadonlyArray<unknown>): Array<unknown> | undefined {
+  const getOption = ParseResult.getOption(ast, false)
+  const out = Arr.filterMap(examples, (e) => getOption(e))
+  return out.length > 0 ? out : undefined
+}
+
+function filterBuiltIn(ast: AST.AST, annotation: string | undefined, key: symbol): string | undefined {
+  if (annotation !== undefined) {
+    switch (ast._tag) {
+      case "StringKeyword":
+        return annotation !== AST.stringKeyword.annotations[key] ? annotation : undefined
+      case "NumberKeyword":
+        return annotation !== AST.numberKeyword.annotations[key] ? annotation : undefined
+      case "BooleanKeyword":
+        return annotation !== AST.booleanKeyword.annotations[key] ? annotation : undefined
+    }
+  }
+  return annotation
+}
+
+function pruneJsonSchemaAnnotations(
+  ast: AST.AST,
+  description: string | undefined,
+  title: string | undefined,
+  def: Option.Option<unknown>,
+  examples: ReadonlyArray<unknown> | undefined
+): JsonSchemaAnnotations | undefined {
+  const out: JsonSchemaAnnotations = {}
+  if (description !== undefined) out.description = description
+  if (title !== undefined) out.title = title
+  if (Option.isSome(def)) {
+    const o = encodeDefault(ast, def.value)
+    if (Option.isSome(o)) {
+      out.default = o.value
+    }
+  }
+  if (examples !== undefined) {
+    const encodedExamples = encodeExamples(ast, examples)
+    if (encodedExamples !== undefined) {
+      out.examples = encodedExamples
+    }
+  }
+  if (Object.keys(out).length === 0) {
+    return undefined
+  }
+  return out
+}
+
+function getContextJsonSchemaAnnotations(ast: AST.AST, annotated: AST.Annotated): JsonSchemaAnnotations | undefined {
+  return pruneJsonSchemaAnnotations(
+    ast,
+    getRawDescription(annotated),
+    getRawTitle(annotated),
+    getRawDefault(annotated),
+    getRawExamples(annotated)
+  )
+}
+
+function getJsonSchemaAnnotations(ast: AST.AST): JsonSchemaAnnotations | undefined {
+  return pruneJsonSchemaAnnotations(
+    ast,
+    filterBuiltIn(ast, getRawDescription(ast), AST.DescriptionAnnotationId),
+    filterBuiltIn(ast, getRawTitle(ast), AST.TitleAnnotationId),
+    getRawDefault(ast),
+    getRawExamples(ast)
+  )
+}
+
+function mergeJsonSchemaAnnotations(
+  jsonSchema: JsonSchema7,
+  jsonSchemaAnnotations: JsonSchemaAnnotations | undefined
+): JsonSchema7 {
+  if (jsonSchemaAnnotations) {
+    if ("$ref" in jsonSchema) {
+      return { allOf: [jsonSchema], ...jsonSchemaAnnotations } as any
+    }
+    return { ...jsonSchema, ...jsonSchemaAnnotations }
+  }
+  return jsonSchema
+}
+
+const pruneUndefined = (ast: AST.AST): AST.AST | undefined => {
+  if (Option.isNone(AST.getJSONSchemaAnnotation(ast))) {
+    return AST.pruneUndefined(ast, pruneUndefined, (ast) => pruneUndefined(ast.from))
+  }
+}
+
+const isParseJsonTransformation = (ast: AST.AST): boolean =>
+  ast.annotations[AST.SchemaIdAnnotationId] === AST.ParseJsonSchemaId
+
+const isOverrideAnnotation = (ast: AST.AST, jsonSchema: JsonSchema7): boolean => {
+  if (AST.isRefinement(ast)) {
+    const schemaId = ast.annotations[AST.SchemaIdAnnotationId]
+    if (schemaId === schemaId_.IntSchemaId) {
+      return "type" in jsonSchema && jsonSchema.type !== "integer"
+    }
+  }
+  return ("type" in jsonSchema) || ("oneOf" in jsonSchema) || ("anyOf" in jsonSchema) || ("$ref" in jsonSchema)
+}
+
+const mergeRefinements = (from: any, jsonSchema: any, ast: AST.AST): any => {
+  const out: any = { ...from, ...getJsonSchemaAnnotations(ast), ...jsonSchema }
+  out.allOf ??= []
+
+  const handle = (name: string, filter: (i: any) => boolean) => {
+    if (name in jsonSchema && name in from) {
+      out.allOf.unshift({ [name]: from[name] })
+      out.allOf = out.allOf.filter(filter)
+    }
+  }
+
+  handle("minLength", (i) => i.minLength > jsonSchema.minLength)
+  handle("maxLength", (i) => i.maxLength < jsonSchema.maxLength)
+  handle("pattern", (i) => i.pattern !== jsonSchema.pattern)
+  handle("minItems", (i) => i.minItems > jsonSchema.minItems)
+  handle("maxItems", (i) => i.maxItems < jsonSchema.maxItems)
+  handle("minimum", (i) => i.minimum > jsonSchema.minimum)
+  handle("maximum", (i) => i.maximum < jsonSchema.maximum)
+  handle("exclusiveMinimum", (i) => i.exclusiveMinimum > jsonSchema.exclusiveMinimum)
+  handle("exclusiveMaximum", (i) => i.exclusiveMaximum < jsonSchema.exclusiveMaximum)
+  handle("multipleOf", (i) => i.multipleOf !== jsonSchema.multipleOf)
+
+  if (out.allOf.length === 0) {
+    delete out.allOf
+  }
+  return out
+}
+
+type GoOptions = {
+  readonly getRef: (id: string) => string
+  readonly target: Target
+  readonly topLevelReferenceStrategy: TopLevelReferenceStrategy
+  readonly additionalPropertiesStrategy: AdditionalPropertiesStrategy
+}
+
+function isContentSchemaSupported(options: GoOptions): boolean {
+  switch (options.target) {
+    case "jsonSchema7":
+      return false
+    case "jsonSchema2019-09":
+    case "openApi3.1":
+      return true
+  }
+}
+
+function getAdditionalProperties(options: GoOptions): boolean {
+  switch (options.additionalPropertiesStrategy) {
+    case "allow":
+      return true
+    case "strict":
+      return false
+  }
+}
+
+function addASTAnnotations(jsonSchema: JsonSchema7, ast: AST.AST): JsonSchema7 {
+  return addAnnotations(jsonSchema, getJsonSchemaAnnotations(ast))
+}
+
+function addAnnotations(jsonSchema: JsonSchema7, annotations: JsonSchemaAnnotations | undefined): JsonSchema7 {
+  if (annotations === undefined || Object.keys(annotations).length === 0) {
+    return jsonSchema
+  }
+  if ("$ref" in jsonSchema) {
+    return { allOf: [jsonSchema], ...annotations } as any
+  }
+  return { ...jsonSchema, ...annotations }
+}
+
+function getIdentifierAnnotation(ast: AST.AST): string | undefined {
+  const identifier = Option.getOrUndefined(AST.getJSONIdentifier(ast))
+  if (identifier === undefined) {
+    if (AST.isSuspend(ast)) {
+      return getIdentifierAnnotation(ast.f())
+    }
+    if (AST.isTransformation(ast) && AST.isTypeLiteral(ast.from) && AST.isDeclaration(ast.to)) {
+      const to = ast.to
+      const surrogate = AST.getSurrogateAnnotation(to)
+      if (Option.isSome(surrogate)) {
+        return getIdentifierAnnotation(to)
+      }
+    }
+  }
+  return identifier
+}
+
+function go(
+  ast: AST.AST,
+  $defs: Record<string, JsonSchema7>,
+  identifier: "handle-identifier" | "ignore-identifier",
+  path: ReadonlyArray<PropertyKey>,
+  options: GoOptions,
+  annotation: "handle-annotation" | "ignore-annotation",
+  errors: "handle-errors" | "ignore-errors"
+): JsonSchema7 {
+  if (
+    identifier === "handle-identifier" &&
+    (options.topLevelReferenceStrategy !== "skip" || AST.isSuspend(ast))
+  ) {
+    const id = getIdentifierAnnotation(ast)
+    if (id !== undefined) {
+      const escapedId = id.replace(/~/ig, "~0").replace(/\//ig, "~1")
+      const out = { $ref: options.getRef(escapedId) }
+      if (!Record.has($defs, id)) {
+        $defs[id] = out
+        $defs[id] = go(ast, $defs, "ignore-identifier", path, options, "handle-annotation", errors)
+      }
+      return out
+    }
+  }
+  if (annotation === "handle-annotation") {
+    const hook = AST.getJSONSchemaAnnotation(ast)
+    if (Option.isSome(hook)) {
+      const handler = hook.value as JsonSchema7
+      if (isOverrideAnnotation(ast, handler)) {
+        switch (ast._tag) {
+          case "Declaration":
+            return addASTAnnotations(handler, ast)
+          default:
+            return handler
+        }
+      } else {
+        switch (ast._tag) {
+          case "Refinement": {
+            const t = AST.getTransformationFrom(ast)
+            if (t === undefined) {
+              return mergeRefinements(
+                go(ast.from, $defs, identifier, path, options, "handle-annotation", errors),
+                handler,
+                ast
+              )
+            } else {
+              return go(t, $defs, identifier, path, options, "handle-annotation", errors)
+            }
+          }
+          default:
+            return {
+              ...go(ast, $defs, identifier, path, options, "ignore-annotation", errors),
+              ...handler
+            } as any
+        }
+      }
+    }
+  }
+  const surrogate = AST.getSurrogateAnnotation(ast)
+  if (Option.isSome(surrogate)) {
+    return go(surrogate.value, $defs, identifier, path, options, "handle-annotation", errors)
+  }
+  switch (ast._tag) {
+    // Unsupported
+    case "Declaration":
+    case "UndefinedKeyword":
+    case "BigIntKeyword":
+    case "UniqueSymbol":
+    case "SymbolKeyword": {
+      if (errors === "ignore-errors") return addASTAnnotations(constAny, ast)
+      throw new Error(errors_.getJSONSchemaMissingAnnotationErrorMessage(path, ast))
+    }
+    case "Suspend": {
+      if (identifier === "handle-identifier") {
+        if (errors === "ignore-errors") return addASTAnnotations(constAny, ast)
+        throw new Error(errors_.getJSONSchemaMissingIdentifierAnnotationErrorMessage(path, ast))
+      }
+      return go(ast.f(), $defs, "ignore-identifier", path, options, "handle-annotation", errors)
+    }
+    // Primitives
+    case "NeverKeyword":
+      return addASTAnnotations(constNever, ast)
+    case "VoidKeyword":
+      return addASTAnnotations(constVoid, ast)
+    case "UnknownKeyword":
+      return addASTAnnotations(constUnknown, ast)
+    case "AnyKeyword":
+      return addASTAnnotations(constAny, ast)
+    case "ObjectKeyword":
+      return addASTAnnotations(constObject, ast)
+    case "StringKeyword":
+      return addASTAnnotations({ type: "string" }, ast)
+    case "NumberKeyword":
+      return addASTAnnotations({ type: "number" }, ast)
+    case "BooleanKeyword":
+      return addASTAnnotations({ type: "boolean" }, ast)
+    case "Literal": {
+      const literal = ast.literal
+      if (literal === null) {
+        return addASTAnnotations({ type: "null" }, ast)
+      } else if (Predicate.isString(literal)) {
+        return addASTAnnotations({ type: "string", enum: [literal] }, ast)
+      } else if (Predicate.isNumber(literal)) {
+        return addASTAnnotations({ type: "number", enum: [literal] }, ast)
+      } else if (Predicate.isBoolean(literal)) {
+        return addASTAnnotations({ type: "boolean", enum: [literal] }, ast)
+      }
+      if (errors === "ignore-errors") return addASTAnnotations(constAny, ast)
+      throw new Error(errors_.getJSONSchemaMissingAnnotationErrorMessage(path, ast))
+    }
+    case "Enums": {
+      const anyOf = ast.enums.map((e) => {
+        const type: "string" | "number" = Predicate.isNumber(e[1]) ? "number" : "string"
+        return { type, title: e[0], enum: [e[1]] }
+      })
+      return anyOf.length >= 1 ?
+        addASTAnnotations({
+          $comment: "/schemas/enums",
+          anyOf
+        }, ast) :
+        addASTAnnotations(constNever, ast)
+    }
+    case "TupleType": {
+      const elements = ast.elements.map((e, i) =>
+        mergeJsonSchemaAnnotations(
+          go(e.type, $defs, "handle-identifier", path.concat(i), options, "handle-annotation", errors),
+          getContextJsonSchemaAnnotations(e.type, e)
+        )
+      )
+      const rest = ast.rest.map((type) =>
+        mergeJsonSchemaAnnotations(
+          go(type.type, $defs, "handle-identifier", path, options, "handle-annotation", errors),
+          getContextJsonSchemaAnnotations(type.type, type)
+        )
+      )
+      const output: JsonSchema7Array = { type: "array" }
+      // ---------------------------------------------
+      // handle elements
+      // ---------------------------------------------
+      const len = ast.elements.length
+      if (len > 0) {
+        output.minItems = len - ast.elements.filter((element) => element.isOptional).length
+        output.items = elements
+      }
+      // ---------------------------------------------
+      // handle rest element
+      // ---------------------------------------------
+      const restLength = rest.length
+      if (restLength > 0) {
+        const head = rest[0]
+        const isHomogeneous = restLength === 1 && ast.elements.every((e) => e.type === ast.rest[0].type)
+        if (isHomogeneous) {
+          output.items = head
+        } else {
+          output.additionalItems = head
+        }
+
+        // ---------------------------------------------
+        // handle post rest elements
+        // ---------------------------------------------
+        if (restLength > 1) {
+          if (errors === "ignore-errors") return addASTAnnotations(constAny, ast)
+          throw new Error(errors_.getJSONSchemaUnsupportedPostRestElementsErrorMessage(path))
+        }
+      } else {
+        if (len > 0) {
+          output.additionalItems = false
+        } else {
+          output.maxItems = 0
+        }
+      }
+
+      return addASTAnnotations(output, ast)
+    }
+    case "TypeLiteral": {
+      if (ast.propertySignatures.length === 0 && ast.indexSignatures.length === 0) {
+        return addASTAnnotations(constEmptyStruct, ast)
+      }
+      const output: JsonSchema7Object = {
+        type: "object",
+        required: [],
+        properties: {},
+        additionalProperties: getAdditionalProperties(options)
+      }
+      let patternProperties: JsonSchema7 | undefined = undefined
+      let propertyNames: JsonSchema7 | undefined = undefined
+      for (const is of ast.indexSignatures) {
+        const pruned = pruneUndefined(is.type) ?? is.type
+        const parameter = is.parameter
+        switch (parameter._tag) {
+          case "StringKeyword": {
+            output.additionalProperties = go(
+              pruned,
+              $defs,
+              "handle-identifier",
+              path,
+              options,
+              "handle-annotation",
+              errors
+            )
+            break
+          }
+          case "TemplateLiteral": {
+            patternProperties = go(pruned, $defs, "handle-identifier", path, options, "handle-annotation", errors)
+            propertyNames = {
+              type: "string",
+              pattern: AST.getTemplateLiteralRegExp(parameter).source
+            }
+            break
+          }
+          case "Refinement": {
+            patternProperties = go(pruned, $defs, "handle-identifier", path, options, "handle-annotation", errors)
+            propertyNames = go(parameter, $defs, "handle-identifier", path, options, "handle-annotation", errors)
+            break
+          }
+          case "SymbolKeyword": {
+            const indexSignaturePath = path.concat("[symbol]")
+            output.additionalProperties = go(
+              pruned,
+              $defs,
+              "handle-identifier",
+              indexSignaturePath,
+              options,
+              "handle-annotation",
+              errors
+            )
+            propertyNames = go(
+              parameter,
+              $defs,
+              "handle-identifier",
+              indexSignaturePath,
+              options,
+              "handle-annotation",
+              errors
+            )
+            break
+          }
+        }
+      }
+      // ---------------------------------------------
+      // handle property signatures
+      // ---------------------------------------------
+      for (let i = 0; i < ast.propertySignatures.length; i++) {
+        const ps = ast.propertySignatures[i]
+        const name = ps.name
+        if (Predicate.isString(name)) {
+          const pruned = pruneUndefined(ps.type)
+          const type = pruned ?? ps.type
+          output.properties[name] = mergeJsonSchemaAnnotations(
+            go(type, $defs, "handle-identifier", path.concat(ps.name), options, "handle-annotation", errors),
+            getContextJsonSchemaAnnotations(type, ps)
+          )
+          // ---------------------------------------------
+          // handle optional property signatures
+          // ---------------------------------------------
+          if (!ps.isOptional && pruned === undefined) {
+            output.required.push(name)
+          }
+        } else {
+          if (errors === "ignore-errors") return addASTAnnotations(constAny, ast)
+          throw new Error(errors_.getJSONSchemaUnsupportedKeyErrorMessage(name, path))
+        }
+      }
+      // ---------------------------------------------
+      // handle index signatures
+      // ---------------------------------------------
+      if (patternProperties !== undefined) {
+        delete output.additionalProperties
+        output.patternProperties = { "": patternProperties }
+      }
+      if (propertyNames !== undefined) {
+        output.propertyNames = propertyNames
+      }
+
+      return addASTAnnotations(output, ast)
+    }
+    case "Union": {
+      const members: Array<JsonSchema7> = ast.types.map((t) =>
+        go(t, $defs, "handle-identifier", path, options, "handle-annotation", errors)
+      )
+      const anyOf = compactUnion(members)
+      switch (anyOf.length) {
+        case 0:
+          return constNever
+        case 1:
+          return addASTAnnotations(anyOf[0], ast)
+        default:
+          return addASTAnnotations({ anyOf }, ast)
+      }
+    }
+    case "Refinement":
+      return go(ast.from, $defs, identifier, path, options, "handle-annotation", errors)
+    case "TemplateLiteral": {
+      const regex = AST.getTemplateLiteralRegExp(ast)
+      return addASTAnnotations({
+        type: "string",
+        title: String(ast),
+        description: "a template literal",
+        pattern: regex.source
+      }, ast)
+    }
+    case "Transformation": {
+      if (isParseJsonTransformation(ast.from)) {
+        const out: JsonSchema7String & { contentSchema?: JsonSchema7 } = {
+          "type": "string",
+          "contentMediaType": "application/json"
+        }
+        if (isContentSchemaSupported(options)) {
+          out["contentSchema"] = go(ast.to, $defs, identifier, path, options, "handle-annotation", errors)
+        }
+        return out
+      }
+      const from = go(ast.from, $defs, identifier, path, options, "handle-annotation", errors)
+      if (
+        ast.transformation._tag === "TypeLiteralTransformation" &&
+        isJsonSchema7Object(from)
+      ) {
+        const to = go(ast.to, {}, "ignore-identifier", path, options, "handle-annotation", "ignore-errors")
+        if (isJsonSchema7Object(to)) {
+          for (const t of ast.transformation.propertySignatureTransformations) {
+            const toKey = t.to
+            const fromKey = t.from
+            if (Predicate.isString(toKey) && Predicate.isString(fromKey)) {
+              const toProperty = to.properties[toKey]
+              if (Predicate.isRecord(toProperty)) {
+                const fromProperty = from.properties[fromKey]
+                if (Predicate.isRecord(fromProperty)) {
+                  const annotations: JsonSchemaAnnotations = {}
+                  if (Predicate.isString(toProperty.title)) annotations.title = toProperty.title
+                  if (Predicate.isString(toProperty.description)) annotations.description = toProperty.description
+                  if (Array.isArray(toProperty.examples)) annotations.examples = toProperty.examples
+                  if (Object.hasOwn(toProperty, "default")) annotations.default = toProperty.default
+                  from.properties[fromKey] = addAnnotations(fromProperty, annotations)
+                }
+              }
+            }
+          }
+        }
+      }
+      return addASTAnnotations(from, ast)
+    }
+  }
+}
+
+function isJsonSchema7Object(jsonSchema: unknown): jsonSchema is JsonSchema7Object {
+  return Predicate.isRecord(jsonSchema) && jsonSchema.type === "object" && Predicate.isRecord(jsonSchema.properties)
+}
+
+function isNeverWithoutCustomAnnotations(jsonSchema: JsonSchema7): boolean {
+  return jsonSchema === constNever || (Predicate.hasProperty(jsonSchema, "$id") && jsonSchema.$id === constNever.$id &&
+    Object.keys(jsonSchema).length === 3 && jsonSchema.title === AST.neverKeyword.annotations[AST.TitleAnnotationId])
+}
+
+function isAny(jsonSchema: JsonSchema7): jsonSchema is JsonSchema7Any {
+  return "$id" in jsonSchema && jsonSchema.$id === constAny.$id
+}
+
+function isUnknown(jsonSchema: JsonSchema7): jsonSchema is JsonSchema7Unknown {
+  return "$id" in jsonSchema && jsonSchema.$id === constUnknown.$id
+}
+
+function isVoid(jsonSchema: JsonSchema7): jsonSchema is JsonSchema7Void {
+  return "$id" in jsonSchema && jsonSchema.$id === constVoid.$id
+}
+
+function isCompactableLiteral(jsonSchema: JsonSchema7 | undefined): jsonSchema is JsonSchema7Enum {
+  return Predicate.hasProperty(jsonSchema, "enum") && "type" in jsonSchema && Object.keys(jsonSchema).length === 2
+}
+
+function compactUnion(members: Array<JsonSchema7>): Array<JsonSchema7> {
+  const out: Array<JsonSchema7> = []
+  for (const m of members) {
+    if (isNeverWithoutCustomAnnotations(m)) continue
+    if (isAny(m) || isUnknown(m) || isVoid(m)) return [m]
+    if (isCompactableLiteral(m) && out.length > 0) {
+      const last = out[out.length - 1]
+      if (isCompactableLiteral(last) && last.type === m.type) {
+        out[out.length - 1] = {
+          type: last.type,
+          enum: [...last.enum, ...m.enum]
+        } as JsonSchema7Enum
+        continue
+      }
+    }
+    out.push(m)
+  }
+  return out
+}