{"version":3,"names":["DEPRECATED_KEYS","FLIPPED_ALIAS_KEYS","TYPES","isVirtualType","type","virtualTypes","explode","visitor","_exploded","nodeType","Object","keys","shouldIgnoreKey","parts","split","length","fns","part","verify","__esModule","ensureEntranceObjects","ensureCallbackArrays","wrapCheck","types","mergePair","aliases","deprecatedKey","console","trace","alias","existing","_verified","Error","validateVisitorMethods","indexOf","visitors","visitorKey","path","val","concat","fn","TypeError","merge","states","wrapper","rootVisitor","i","state","visitorType","wrapWithStateOrWrapper","nodeVisitor","oldVisitor","newVisitor","key","Array","isArray","map","newFn","call","toString","obj","enter","exit","apply","arguments","dest","src"],"sources":["../src/visitors.ts"],"sourcesContent":["import * as virtualTypes from \"./path/lib/virtual-types\";\nimport { DEPRECATED_KEYS, FLIPPED_ALIAS_KEYS, TYPES } from \"@babel/types\";\nimport type { NodePath, Visitor } from \"./index\";\n\ntype VIRTUAL_TYPES = keyof typeof virtualTypes;\nfunction isVirtualType(type: string): type is VIRTUAL_TYPES {\n  return type in virtualTypes;\n}\n\n/**\n * explode() will take a visitor object with all of the various shorthands\n * that we support, and validates & normalizes it into a common format, ready\n * to be used in traversal\n *\n * The various shorthands are:\n * * `Identifier() { ... }` -> `Identifier: { enter() { ... } }`\n * * `\"Identifier|NumericLiteral\": { ... }` -> `Identifier: { ... }, NumericLiteral: { ... }`\n * * Aliases in `@babel/types`: e.g. `Property: { ... }` -> `ObjectProperty: { ... }, ClassProperty: { ... }`\n *\n * Other normalizations are:\n * * Visitors of virtual types are wrapped, so that they are only visited when\n *   their dynamic check passes\n * * `enter` and `exit` functions are wrapped in arrays, to ease merging of\n *   visitors\n */\nexport function explode(visitor: Visitor) {\n  if (visitor._exploded) return visitor;\n  visitor._exploded = true;\n\n  // normalise pipes\n  for (const nodeType of Object.keys(visitor) as (keyof Visitor)[]) {\n    if (shouldIgnoreKey(nodeType)) continue;\n\n    const parts: Array<string> = nodeType.split(\"|\");\n    if (parts.length === 1) continue;\n\n    const fns = visitor[nodeType];\n    delete visitor[nodeType];\n\n    for (const part of parts) {\n      // @ts-expect-error part will be verified by `verify` later\n      visitor[part] = fns;\n    }\n  }\n\n  // verify data structure\n  verify(visitor);\n\n  // make sure there's no __esModule type since this is because we're using loose mode\n  // and it sets __esModule to be enumerable on all modules :(\n  // @ts-expect-error ESModule interop\n  delete visitor.__esModule;\n\n  // ensure visitors are objects\n  ensureEntranceObjects(visitor);\n\n  // ensure enter/exit callbacks are arrays\n  ensureCallbackArrays(visitor);\n\n  // add type wrappers\n  for (const nodeType of Object.keys(visitor)) {\n    if (shouldIgnoreKey(nodeType)) continue;\n\n    if (!isVirtualType(nodeType)) continue;\n\n    // wrap all the functions\n    const fns = visitor[nodeType];\n    for (const type of Object.keys(fns)) {\n      // @ts-expect-error manipulating visitors\n      fns[type] = wrapCheck(nodeType, fns[type]);\n    }\n\n    // clear it from the visitor\n    delete visitor[nodeType];\n\n    const types = virtualTypes[nodeType];\n    if (types !== null) {\n      for (const type of types) {\n        // merge the visitor if necessary or just put it back in\n        if (visitor[type]) {\n          mergePair(visitor[type], fns);\n        } else {\n          // @ts-expect-error Expression produces too complex union\n          visitor[type] = fns;\n        }\n      }\n    } else {\n      mergePair(visitor, fns);\n    }\n  }\n\n  // add aliases\n  for (const nodeType of Object.keys(visitor) as (keyof Visitor)[]) {\n    if (shouldIgnoreKey(nodeType)) continue;\n\n    const fns = visitor[nodeType];\n\n    let aliases = FLIPPED_ALIAS_KEYS[nodeType];\n\n    const deprecatedKey = DEPRECATED_KEYS[nodeType];\n    if (deprecatedKey) {\n      console.trace(\n        `Visitor defined for ${nodeType} but it has been renamed to ${deprecatedKey}`,\n      );\n      aliases = [deprecatedKey];\n    }\n\n    if (!aliases) continue;\n\n    // clear it from the visitor\n    delete visitor[nodeType];\n\n    for (const alias of aliases) {\n      const existing = visitor[alias];\n      if (existing) {\n        mergePair(existing, fns);\n      } else {\n        // @ts-expect-error Expression produces a union type that is too complex to represent.\n        visitor[alias] = { ...fns };\n      }\n    }\n  }\n\n  for (const nodeType of Object.keys(visitor)) {\n    if (shouldIgnoreKey(nodeType)) continue;\n\n    ensureCallbackArrays(\n      // @ts-expect-error nodeType must present in visitor after previous validations\n      visitor[nodeType],\n    );\n  }\n\n  return visitor;\n}\n\nexport function verify(visitor: Visitor) {\n  if (visitor._verified) return;\n\n  if (typeof visitor === \"function\") {\n    throw new Error(\n      \"You passed `traverse()` a function when it expected a visitor object, \" +\n        \"are you sure you didn't mean `{ enter: Function }`?\",\n    );\n  }\n\n  for (const nodeType of Object.keys(visitor) as (keyof Visitor)[]) {\n    if (nodeType === \"enter\" || nodeType === \"exit\") {\n      validateVisitorMethods(nodeType, visitor[nodeType]);\n    }\n\n    if (shouldIgnoreKey(nodeType)) continue;\n\n    if (TYPES.indexOf(nodeType) < 0) {\n      throw new Error(\n        `You gave us a visitor for the node type ${nodeType} but it's not a valid type`,\n      );\n    }\n\n    const visitors = visitor[nodeType];\n    if (typeof visitors === \"object\") {\n      for (const visitorKey of Object.keys(visitors)) {\n        if (visitorKey === \"enter\" || visitorKey === \"exit\") {\n          // verify that it just contains functions\n          validateVisitorMethods(\n            `${nodeType}.${visitorKey}`,\n            visitors[visitorKey],\n          );\n        } else {\n          throw new Error(\n            \"You passed `traverse()` a visitor object with the property \" +\n              `${nodeType} that has the invalid property ${visitorKey}`,\n          );\n        }\n      }\n    }\n  }\n\n  visitor._verified = true;\n}\n\nfunction validateVisitorMethods(\n  path: string,\n  val: any,\n): asserts val is Function | Function[] {\n  const fns = [].concat(val);\n  for (const fn of fns) {\n    if (typeof fn !== \"function\") {\n      throw new TypeError(\n        `Non-function found defined in ${path} with type ${typeof fn}`,\n      );\n    }\n  }\n}\n\nexport function merge<State>(visitors: Visitor<State>[]): Visitor<State>;\nexport function merge(\n  visitors: Visitor<unknown>[],\n  states?: any[],\n  wrapper?: Function | null,\n): Visitor<unknown>;\nexport function merge(\n  visitors: any[],\n  states: any[] = [],\n  wrapper?: Function | null,\n) {\n  const rootVisitor: Visitor = {};\n\n  for (let i = 0; i < visitors.length; i++) {\n    const visitor = visitors[i];\n    const state = states[i];\n\n    explode(visitor);\n\n    for (const type of Object.keys(visitor) as (keyof Visitor)[]) {\n      let visitorType = visitor[type];\n\n      // if we have state or wrapper then overload the callbacks to take it\n      if (state || wrapper) {\n        visitorType = wrapWithStateOrWrapper(visitorType, state, wrapper);\n      }\n\n      // @ts-expect-error: Expression produces a union type that is too complex to represent.\n      const nodeVisitor = (rootVisitor[type] ||= {});\n      mergePair(nodeVisitor, visitorType);\n    }\n  }\n\n  return rootVisitor;\n}\n\nfunction wrapWithStateOrWrapper<State>(\n  oldVisitor: Visitor<State>,\n  state: State,\n  wrapper?: Function | null,\n) {\n  const newVisitor: Visitor = {};\n\n  for (const key of Object.keys(oldVisitor) as (keyof Visitor<State>)[]) {\n    let fns = oldVisitor[key];\n\n    // not an enter/exit array of callbacks\n    if (!Array.isArray(fns)) continue;\n\n    // @ts-expect-error manipulating visitors\n    fns = fns.map(function (fn) {\n      let newFn = fn;\n\n      if (state) {\n        newFn = function (path: NodePath) {\n          return fn.call(state, path, state);\n        };\n      }\n\n      if (wrapper) {\n        // @ts-expect-error Fixme: document state.key\n        newFn = wrapper(state.key, key, newFn);\n      }\n\n      // Override toString in case this function is printed, we want to print the wrapped function, same as we do in `wrapCheck`\n      if (newFn !== fn) {\n        newFn.toString = () => fn.toString();\n      }\n\n      return newFn;\n    });\n\n    // @ts-expect-error: Expression produces a union type that is too complex to represent.\n    newVisitor[key] = fns;\n  }\n\n  return newVisitor;\n}\n\nfunction ensureEntranceObjects(obj: Visitor) {\n  for (const key of Object.keys(obj) as (keyof Visitor)[]) {\n    if (shouldIgnoreKey(key)) continue;\n\n    const fns = obj[key];\n    if (typeof fns === \"function\") {\n      // @ts-expect-error: Expression produces a union type that is too complex to represent.\n      obj[key] = { enter: fns };\n    }\n  }\n}\n\nfunction ensureCallbackArrays(obj: Visitor) {\n  // @ts-expect-error normalizing enter property\n  if (obj.enter && !Array.isArray(obj.enter)) obj.enter = [obj.enter];\n  // @ts-expect-error normalizing exit property\n  if (obj.exit && !Array.isArray(obj.exit)) obj.exit = [obj.exit];\n}\n\nfunction wrapCheck(nodeType: VIRTUAL_TYPES, fn: Function) {\n  const newFn = function (this: unknown, path: NodePath) {\n    if (path[`is${nodeType}`]()) {\n      return fn.apply(this, arguments);\n    }\n  };\n  newFn.toString = () => fn.toString();\n  return newFn;\n}\n\nfunction shouldIgnoreKey(\n  key: string,\n): key is\n  | \"enter\"\n  | \"exit\"\n  | \"shouldSkip\"\n  | \"denylist\"\n  | \"noScope\"\n  | \"skipKeys\"\n  | \"blacklist\" {\n  // internal/hidden key\n  if (key[0] === \"_\") return true;\n\n  // ignore function keys\n  if (key === \"enter\" || key === \"exit\" || key === \"shouldSkip\") return true;\n\n  // ignore other options\n  if (\n    key === \"denylist\" ||\n    key === \"noScope\" ||\n    key === \"skipKeys\" ||\n    // TODO: Remove in Babel 8\n    key === \"blacklist\"\n  ) {\n    return true;\n  }\n\n  return false;\n}\n\nfunction mergePair(dest: any, src: any) {\n  for (const key of Object.keys(src)) {\n    dest[key] = [].concat(dest[key] || [], src[key]);\n  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