All files / lib/internal/util inspect.js

99.65% Statements 2020/2027
99.16% Branches 707/713
100% Functions 57/57
99.65% Lines 2020/2027

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'use strict';
 
const {
  Array,
  ArrayIsArray,
  BigInt64Array,
  BigIntPrototypeValueOf,
  BigUint64Array,
  BooleanPrototypeValueOf,
  DatePrototypeGetTime,
  DatePrototypeToISOString,
  DatePrototypeToString,
  ErrorPrototypeToString,
  Float32Array,
  JSONStringify,
  Map,
  MapPrototype,
  MapPrototypeEntries,
  MathFloor,
  MathMax,
  MathMin,
  MathRound,
  MathSqrt,
  Number,
  NumberIsNaN,
  NumberPrototypeValueOf,
  ObjectAssign,
  ObjectCreate,
  ObjectDefineProperty,
  ObjectGetOwnPropertyDescriptor,
  ObjectGetOwnPropertyNames,
  ObjectGetOwnPropertySymbols,
  ObjectGetPrototypeOf,
  ObjectIs,
  ObjectKeys,
  ObjectPrototypeHasOwnProperty,
  ObjectPrototypePropertyIsEnumerable,
  ObjectSeal,
  RegExp,
  RegExpPrototypeToString,
  Set,
  SetPrototype,
  SetPrototypeValues,
  StringPrototypeValueOf,
  SymbolPrototypeToString,
  SymbolPrototypeValueOf,
  SymbolIterator,
  SymbolToStringTag,
  Uint16Array,
  uncurryThis,
} = primordials;
 
const {
  getOwnNonIndexProperties,
  getPromiseDetails,
  getProxyDetails,
  kPending,
  kRejected,
  previewEntries,
  getConstructorName: internalGetConstructorName,
  propertyFilter: {
    ALL_PROPERTIES,
    ONLY_ENUMERABLE
  }
} = internalBinding('util');
 
const {
  customInspectSymbol,
  isError,
  join,
  removeColors
} = require('internal/util');
 
const {
  codes: {
    ERR_INVALID_ARG_TYPE
  },
  isStackOverflowError
} = require('internal/errors');
 
const {
  isAsyncFunction,
  isGeneratorFunction,
  isAnyArrayBuffer,
  isArrayBuffer,
  isArgumentsObject,
  isBoxedPrimitive,
  isDataView,
  isExternal,
  isMap,
  isMapIterator,
  isModuleNamespaceObject,
  isNativeError,
  isPromise,
  isSet,
  isSetIterator,
  isWeakMap,
  isWeakSet,
  isRegExp,
  isDate,
  isTypedArray,
  isStringObject,
  isNumberObject,
  isBooleanObject,
  isBigIntObject,
  isUint8Array,
  isUint8ClampedArray,
  isUint16Array,
  isUint32Array,
  isInt8Array,
  isInt16Array,
  isInt32Array,
  isFloat32Array,
  isFloat64Array,
  isBigInt64Array,
  isBigUint64Array
} = require('internal/util/types');
 
const assert = require('internal/assert');
 
const { NativeModule } = require('internal/bootstrap/loaders');
 
const setSizeGetter = uncurryThis(
  ObjectGetOwnPropertyDescriptor(SetPrototype, 'size').get);
const mapSizeGetter = uncurryThis(
  ObjectGetOwnPropertyDescriptor(MapPrototype, 'size').get);
const typedArraySizeGetter = uncurryThis(
  ObjectGetOwnPropertyDescriptor(
    ObjectGetPrototypeOf(Uint8Array.prototype), 'length').get);
 
let hexSlice;
 
const builtInObjects = new Set(
  ObjectGetOwnPropertyNames(global).filter((e) => /^[A-Z][a-zA-Z0-9]+$/.test(e))
);
 
// https://tc39.es/ecma262/#sec-IsHTMLDDA-internal-slot
const isUndetectableObject = (v) => typeof v === 'undefined' && v !== undefined;
 
// These options must stay in sync with `getUserOptions`. So if any option will
// be added or removed, `getUserOptions` must also be updated accordingly.
const inspectDefaultOptions = ObjectSeal({
  showHidden: false,
  depth: 2,
  colors: false,
  customInspect: true,
  showProxy: false,
  maxArrayLength: 100,
  breakLength: 80,
  compact: 3,
  sorted: false,
  getters: false
});
 
const kObjectType = 0;
const kArrayType = 1;
const kArrayExtrasType = 2;
 
/* eslint-disable no-control-regex */
const strEscapeSequencesRegExp = /[\x00-\x1f\x27\x5c\x7f-\x9f]/;
const strEscapeSequencesReplacer = /[\x00-\x1f\x27\x5c\x7f-\x9f]/g;
const strEscapeSequencesRegExpSingle = /[\x00-\x1f\x5c\x7f-\x9f]/;
const strEscapeSequencesReplacerSingle = /[\x00-\x1f\x5c\x7f-\x9f]/g;
/* eslint-enable no-control-regex */
 
const keyStrRegExp = /^[a-zA-Z_][a-zA-Z_0-9]*$/;
const numberRegExp = /^(0|[1-9][0-9]*)$/;
 
const coreModuleRegExp = /^    at (?:[^/\\(]+ \(|)((?<![/\\]).+)\.js:\d+:\d+\)?$/;
const nodeModulesRegExp = /[/\\]node_modules[/\\](.+?)(?=[/\\])/g;
 
const kMinLineLength = 16;
 
// Constants to map the iterator state.
const kWeak = 0;
const kIterator = 1;
const kMapEntries = 2;
 
// Escaped control characters (plus the single quote and the backslash). Use
// empty strings to fill up unused entries.
const meta = [
  '\\x00', '\\x01', '\\x02', '\\x03', '\\x04', '\\x05', '\\x06', '\\x07', // x07
  '\\b', '\\t', '\\n', '\\x0B', '\\f', '\\r', '\\x0E', '\\x0F',           // x0F
  '\\x10', '\\x11', '\\x12', '\\x13', '\\x14', '\\x15', '\\x16', '\\x17', // x17
  '\\x18', '\\x19', '\\x1A', '\\x1B', '\\x1C', '\\x1D', '\\x1E', '\\x1F', // x1F
  '', '', '', '', '', '', '', "\\'", '', '', '', '', '', '', '', '',      // x2F
  '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '',         // x3F
  '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '',         // x4F
  '', '', '', '', '', '', '', '', '', '', '', '', '\\\\', '', '', '',     // x5F
  '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '',         // x6F
  '', '', '', '', '', '', '', '', '', '', '', '', '', '', '', '\\x7F',    // x7F
  '\\x80', '\\x81', '\\x82', '\\x83', '\\x84', '\\x85', '\\x86', '\\x87', // x87
  '\\x88', '\\x89', '\\x8A', '\\x8B', '\\x8C', '\\x8D', '\\x8E', '\\x8F', // x8F
  '\\x90', '\\x91', '\\x92', '\\x93', '\\x94', '\\x95', '\\x96', '\\x97', // x97
  '\\x98', '\\x99', '\\x9A', '\\x9B', '\\x9C', '\\x9D', '\\x9E', '\\x9F', // x9F
];
 
// Regex used for ansi escape code splitting
// Adopted from https://github.com/chalk/ansi-regex/blob/master/index.js
// License: MIT, authors: @sindresorhus, Qix-, arjunmehta and LitoMore
// Matches all ansi escape code sequences in a string
const ansiPattern = '[\\u001B\\u009B][[\\]()#;?]*' +
  '(?:(?:(?:[a-zA-Z\\d]*(?:;[-a-zA-Z\\d\\/#&.:=?%@~_]*)*)?\\u0007)' +
  '|(?:(?:\\d{1,4}(?:;\\d{0,4})*)?[\\dA-PR-TZcf-ntqry=><~]))';
const ansi = new RegExp(ansiPattern, 'g');
 
let getStringWidth;
 
function getUserOptions(ctx) {
  return {
    stylize: ctx.stylize,
    showHidden: ctx.showHidden,
    depth: ctx.depth,
    colors: ctx.colors,
    customInspect: ctx.customInspect,
    showProxy: ctx.showProxy,
    maxArrayLength: ctx.maxArrayLength,
    breakLength: ctx.breakLength,
    compact: ctx.compact,
    sorted: ctx.sorted,
    getters: ctx.getters,
    ...ctx.userOptions
  };
}
 
/**
 * Echos the value of any input. Tries to print the value out
 * in the best way possible given the different types.
 *
 * @param {any} value The value to print out.
 * @param {Object} opts Optional options object that alters the output.
 */
/* Legacy: value, showHidden, depth, colors */
function inspect(value, opts) {
  // Default options
  const ctx = {
    budget: {},
    indentationLvl: 0,
    seen: [],
    currentDepth: 0,
    stylize: stylizeNoColor,
    showHidden: inspectDefaultOptions.showHidden,
    depth: inspectDefaultOptions.depth,
    colors: inspectDefaultOptions.colors,
    customInspect: inspectDefaultOptions.customInspect,
    showProxy: inspectDefaultOptions.showProxy,
    maxArrayLength: inspectDefaultOptions.maxArrayLength,
    breakLength: inspectDefaultOptions.breakLength,
    compact: inspectDefaultOptions.compact,
    sorted: inspectDefaultOptions.sorted,
    getters: inspectDefaultOptions.getters
  };
  if (arguments.length > 1) {
    // Legacy...
    if (arguments.length > 2) {
      if (arguments[2] !== undefined) {
        ctx.depth = arguments[2];
      }
      if (arguments.length > 3 && arguments[3] !== undefined) {
        ctx.colors = arguments[3];
      }
    }
    // Set user-specified options
    if (typeof opts === 'boolean') {
      ctx.showHidden = opts;
    } else if (opts) {
      const optKeys = ObjectKeys(opts);
      for (const key of optKeys) {
        // TODO(BridgeAR): Find a solution what to do about stylize. Either make
        // this function public or add a new API with a similar or better
        // functionality.
        if (
          ObjectPrototypeHasOwnProperty(inspectDefaultOptions, key) ||
          key === 'stylize') {
          ctx[key] = opts[key];
        } else if (ctx.userOptions === undefined) {
          // This is required to pass through the actual user input.
          ctx.userOptions = opts;
        }
      }
    }
  }
  if (ctx.colors) ctx.stylize = stylizeWithColor;
  if (ctx.maxArrayLength === null) ctx.maxArrayLength = Infinity;
  return formatValue(ctx, value, 0);
}
inspect.custom = customInspectSymbol;
 
ObjectDefineProperty(inspect, 'defaultOptions', {
  get() {
    return inspectDefaultOptions;
  },
  set(options) {
    if (options === null || typeof options !== 'object') {
      throw new ERR_INVALID_ARG_TYPE('options', 'Object', options);
    }
    return ObjectAssign(inspectDefaultOptions, options);
  }
});
 
// Set Graphics Rendition http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
// Each color consists of an array with the color code as first entry and the
// reset code as second entry.
const defaultFG = 39;
const defaultBG = 49;
inspect.colors = ObjectAssign(ObjectCreate(null), {
  reset: [0, 0],
  bold: [1, 22],
  dim: [2, 22], // Alias: faint
  italic: [3, 23],
  underline: [4, 24],
  blink: [5, 25],
  // Swap forground and background colors
  inverse: [7, 27], // Alias: swapcolors, swapColors
  hidden: [8, 28], // Alias: conceal
  strikethrough: [9, 29], // Alias: strikeThrough, crossedout, crossedOut
  doubleunderline: [21, 24], // Alias: doubleUnderline
  black: [30, defaultFG],
  red: [31, defaultFG],
  green: [32, defaultFG],
  yellow: [33, defaultFG],
  blue: [34, defaultFG],
  magenta: [35, defaultFG],
  cyan: [36, defaultFG],
  white: [37, defaultFG],
  bgBlack: [40, defaultBG],
  bgRed: [41, defaultBG],
  bgGreen: [42, defaultBG],
  bgYellow: [43, defaultBG],
  bgBlue: [44, defaultBG],
  bgMagenta: [45, defaultBG],
  bgCyan: [46, defaultBG],
  bgWhite: [47, defaultBG],
  framed: [51, 54],
  overlined: [53, 55],
  gray: [90, defaultFG], // Alias: grey, blackBright
  redBright: [91, defaultFG],
  greenBright: [92, defaultFG],
  yellowBright: [93, defaultFG],
  blueBright: [94, defaultFG],
  magentaBright: [95, defaultFG],
  cyanBright: [96, defaultFG],
  whiteBright: [97, defaultFG],
  bgGray: [100, defaultBG], // Alias: bgGrey, bgBlackBright
  bgRedBright: [101, defaultBG],
  bgGreenBright: [102, defaultBG],
  bgYellowBright: [103, defaultBG],
  bgBlueBright: [104, defaultBG],
  bgMagentaBright: [105, defaultBG],
  bgCyanBright: [106, defaultBG],
  bgWhiteBright: [107, defaultBG],
});
 
function defineColorAlias(target, alias) {
  ObjectDefineProperty(inspect.colors, alias, {
    get() {
      return this[target];
    },
    set(value) {
      this[target] = value;
    },
    configurable: true,
    enumerable: false
  });
}
 
defineColorAlias('gray', 'grey');
defineColorAlias('gray', 'blackBright');
defineColorAlias('bgGray', 'bgGrey');
defineColorAlias('bgGray', 'bgBlackBright');
defineColorAlias('dim', 'faint');
defineColorAlias('strikethrough', 'crossedout');
defineColorAlias('strikethrough', 'strikeThrough');
defineColorAlias('strikethrough', 'crossedOut');
defineColorAlias('hidden', 'conceal');
defineColorAlias('inverse', 'swapColors');
defineColorAlias('inverse', 'swapcolors');
defineColorAlias('doubleunderline', 'doubleUnderline');
 
// TODO(BridgeAR): Add function style support for more complex styles.
// Don't use 'blue' not visible on cmd.exe
inspect.styles = ObjectAssign(ObjectCreate(null), {
  special: 'cyan',
  number: 'yellow',
  bigint: 'yellow',
  boolean: 'yellow',
  undefined: 'grey',
  null: 'bold',
  string: 'green',
  symbol: 'green',
  date: 'magenta',
  // "name": intentionally not styling
  // TODO(BridgeAR): Highlight regular expressions properly.
  regexp: 'red',
  module: 'underline'
});
 
function addQuotes(str, quotes) {
  if (quotes === -1) {
    return `"${str}"`;
  }
  if (quotes === -2) {
    return `\`${str}\``;
  }
  return `'${str}'`;
}
 
const escapeFn = (str) => meta[str.charCodeAt(0)];
 
// Escape control characters, single quotes and the backslash.
// This is similar to JSON stringify escaping.
function strEscape(str) {
  let escapeTest = strEscapeSequencesRegExp;
  let escapeReplace = strEscapeSequencesReplacer;
  let singleQuote = 39;
 
  // Check for double quotes. If not present, do not escape single quotes and
  // instead wrap the text in double quotes. If double quotes exist, check for
  // backticks. If they do not exist, use those as fallback instead of the
  // double quotes.
  if (str.includes("'")) {
    // This invalidates the charCode and therefore can not be matched for
    // anymore.
    if (!str.includes('"')) {
      singleQuote = -1;
    } else if (!str.includes('`') && !str.includes('${')) {
      singleQuote = -2;
    }
    if (singleQuote !== 39) {
      escapeTest = strEscapeSequencesRegExpSingle;
      escapeReplace = strEscapeSequencesReplacerSingle;
    }
  }
 
  // Some magic numbers that worked out fine while benchmarking with v8 6.0
  if (str.length < 5000 && !escapeTest.test(str))
    return addQuotes(str, singleQuote);
  if (str.length > 100) {
    str = str.replace(escapeReplace, escapeFn);
    return addQuotes(str, singleQuote);
  }
 
  let result = '';
  let last = 0;
  const lastIndex = str.length;
  for (let i = 0; i < lastIndex; i++) {
    const point = str.charCodeAt(i);
    if (point === singleQuote ||
        point === 92 ||
        point < 32 ||
        (point > 126 && point < 160)) {
      if (last === i) {
        result += meta[point];
      } else {
        result += `${str.slice(last, i)}${meta[point]}`;
      }
      last = i + 1;
    }
  }
 
  if (last !== lastIndex) {
    result += str.slice(last);
  }
  return addQuotes(result, singleQuote);
}
 
function stylizeWithColor(str, styleType) {
  const style = inspect.styles[styleType];
  if (style !== undefined) {
    const color = inspect.colors[style];
    return `\u001b[${color[0]}m${str}\u001b[${color[1]}m`;
  }
  return str;
}
 
function stylizeNoColor(str) {
  return str;
}
 
// Return a new empty array to push in the results of the default formatter.
function getEmptyFormatArray() {
  return [];
}
 
function getConstructorName(obj, ctx, recurseTimes, protoProps) {
  let firstProto;
  const tmp = obj;
  while (obj || isUndetectableObject(obj)) {
    const descriptor = ObjectGetOwnPropertyDescriptor(obj, 'constructor');
    if (descriptor !== undefined &&
        typeof descriptor.value === 'function' &&
        descriptor.value.name !== '') {
      if (protoProps !== undefined &&
         (firstProto !== obj ||
         !builtInObjects.has(descriptor.value.name))) {
        addPrototypeProperties(
          ctx, tmp, firstProto || tmp, recurseTimes, protoProps);
      }
      return descriptor.value.name;
    }
 
    obj = ObjectGetPrototypeOf(obj);
    if (firstProto === undefined) {
      firstProto = obj;
    }
  }
 
  if (firstProto === null) {
    return null;
  }
 
  const res = internalGetConstructorName(tmp);
 
  if (recurseTimes > ctx.depth && ctx.depth !== null) {
    return `${res} <Complex prototype>`;
  }
 
  const protoConstr = getConstructorName(
    firstProto, ctx, recurseTimes + 1, protoProps);
 
  if (protoConstr === null) {
    return `${res} <${inspect(firstProto, {
      ...ctx,
      customInspect: false,
      depth: -1
    })}>`;
  }
 
  return `${res} <${protoConstr}>`;
}
 
// This function has the side effect of adding prototype properties to the
// `output` argument (which is an array). This is intended to highlight user
// defined prototype properties.
function addPrototypeProperties(ctx, main, obj, recurseTimes, output) {
  let depth = 0;
  let keys;
  let keySet;
  do {
    if (depth !== 0 || main === obj) {
      obj = ObjectGetPrototypeOf(obj);
      // Stop as soon as a null prototype is encountered.
      if (obj === null) {
        return;
      }
      // Stop as soon as a built-in object type is detected.
      const descriptor = ObjectGetOwnPropertyDescriptor(obj, 'constructor');
      if (descriptor !== undefined &&
          typeof descriptor.value === 'function' &&
          builtInObjects.has(descriptor.value.name)) {
        return;
      }
    }
 
    if (depth === 0) {
      keySet = new Set();
    } else {
      keys.forEach((key) => keySet.add(key));
    }
    // Get all own property names and symbols.
    keys = ObjectGetOwnPropertyNames(obj);
    const symbols = ObjectGetOwnPropertySymbols(obj);
    if (symbols.length !== 0) {
      keys.push(...symbols);
    }
    for (const key of keys) {
      // Ignore the `constructor` property and keys that exist on layers above.
      if (key === 'constructor' ||
          ObjectPrototypeHasOwnProperty(main, key) ||
          (depth !== 0 && keySet.has(key))) {
        continue;
      }
      const desc = ObjectGetOwnPropertyDescriptor(obj, key);
      if (typeof desc.value === 'function') {
        continue;
      }
      const value = formatProperty(
        ctx, obj, recurseTimes, key, kObjectType, desc);
      if (ctx.colors) {
        // Faint!
        output.push(`\u001b[2m${value}\u001b[22m`);
      } else {
        output.push(value);
      }
    }
  // Limit the inspection to up to three prototype layers. Using `recurseTimes`
  // is not a good choice here, because it's as if the properties are declared
  // on the current object from the users perspective.
  } while (++depth !== 3);
}
 
function getPrefix(constructor, tag, fallback, size = '') {
  if (constructor === null) {
    if (tag !== '') {
      return `[${fallback}${size}: null prototype] [${tag}] `;
    }
    return `[${fallback}${size}: null prototype] `;
  }
 
  if (tag !== '' && constructor !== tag) {
    return `${constructor}${size} [${tag}] `;
  }
  return `${constructor}${size} `;
}
 
// Look up the keys of the object.
function getKeys(value, showHidden) {
  let keys;
  const symbols = ObjectGetOwnPropertySymbols(value);
  if (showHidden) {
    keys = ObjectGetOwnPropertyNames(value);
    if (symbols.length !== 0)
      keys.push(...symbols);
  } else {
    // This might throw if `value` is a Module Namespace Object from an
    // unevaluated module, but we don't want to perform the actual type
    // check because it's expensive.
    // TODO(devsnek): track https://github.com/tc39/ecma262/issues/1209
    // and modify this logic as needed.
    try {
      keys = ObjectKeys(value);
    } catch (err) {
      assert(isNativeError(err) && err.name === 'ReferenceError' &&
             isModuleNamespaceObject(value));
      keys = ObjectGetOwnPropertyNames(value);
    }
    if (symbols.length !== 0) {
      const filter = (key) => ObjectPrototypePropertyIsEnumerable(value, key);
      keys.push(...symbols.filter(filter));
    }
  }
  return keys;
}
 
function getCtxStyle(value, constructor, tag) {
  let fallback = '';
  if (constructor === null) {
    fallback = internalGetConstructorName(value);
    if (fallback === tag) {
      fallback = 'Object';
    }
  }
  return getPrefix(constructor, tag, fallback);
}
 
function formatProxy(ctx, proxy, recurseTimes) {
  if (recurseTimes > ctx.depth && ctx.depth !== null) {
    return ctx.stylize('Proxy [Array]', 'special');
  }
  recurseTimes += 1;
  ctx.indentationLvl += 2;
  const res = [
    formatValue(ctx, proxy[0], recurseTimes),
    formatValue(ctx, proxy[1], recurseTimes)
  ];
  ctx.indentationLvl -= 2;
  return reduceToSingleString(
    ctx, res, '', ['Proxy [', ']'], kArrayExtrasType, recurseTimes);
}
 
function findTypedConstructor(value) {
  for (const [check, clazz] of [
    [isUint8Array, Uint8Array],
    [isUint8ClampedArray, Uint8ClampedArray],
    [isUint16Array, Uint16Array],
    [isUint32Array, Uint32Array],
    [isInt8Array, Int8Array],
    [isInt16Array, Int16Array],
    [isInt32Array, Int32Array],
    [isFloat32Array, Float32Array],
    [isFloat64Array, Float64Array],
    [isBigInt64Array, BigInt64Array],
    [isBigUint64Array, BigUint64Array]
  ]) {
    if (check(value)) {
      return clazz;
    }
  }
}
 
// Note: using `formatValue` directly requires the indentation level to be
// corrected by setting `ctx.indentationLvL += diff` and then to decrease the
// value afterwards again.
function formatValue(ctx, value, recurseTimes, typedArray) {
  // Primitive types cannot have properties.
  if (typeof value !== 'object' &&
      typeof value !== 'function' &&
      !isUndetectableObject(value)) {
    return formatPrimitive(ctx.stylize, value, ctx);
  }
  if (value === null) {
    return ctx.stylize('null', 'null');
  }
 
  // Memorize the context for custom inspection on proxies.
  const context = value;
  // Always check for proxies to prevent side effects and to prevent triggering
  // any proxy handlers.
  const proxy = getProxyDetails(value, !!ctx.showProxy);
  if (proxy !== undefined) {
    if (ctx.showProxy) {
      return formatProxy(ctx, proxy, recurseTimes);
    }
    value = proxy;
  }
 
  // Provide a hook for user-specified inspect functions.
  // Check that value is an object with an inspect function on it.
  if (ctx.customInspect) {
    const maybeCustom = value[customInspectSymbol];
    if (typeof maybeCustom === 'function' &&
        // Filter out the util module, its inspect function is special.
        maybeCustom !== inspect &&
        // Also filter out any prototype objects using the circular check.
        !(value.constructor && value.constructor.prototype === value)) {
      // This makes sure the recurseTimes are reported as before while using
      // a counter internally.
      const depth = ctx.depth === null ? null : ctx.depth - recurseTimes;
      const ret = maybeCustom.call(context, depth, getUserOptions(ctx));
      // If the custom inspection method returned `this`, don't go into
      // infinite recursion.
      if (ret !== context) {
        if (typeof ret !== 'string') {
          return formatValue(ctx, ret, recurseTimes);
        }
        return ret.replace(/\n/g, `\n${' '.repeat(ctx.indentationLvl)}`);
      }
    }
  }
 
  // Using an array here is actually better for the average case than using
  // a Set. `seen` will only check for the depth and will never grow too large.
  if (ctx.seen.includes(value)) {
    let index = 1;
    if (ctx.circular === undefined) {
      ctx.circular = new Map([[value, index]]);
    } else {
      index = ctx.circular.get(value);
      if (index === undefined) {
        index = ctx.circular.size + 1;
        ctx.circular.set(value, index);
      }
    }
    return ctx.stylize(`[Circular *${index}]`, 'special');
  }
 
  return formatRaw(ctx, value, recurseTimes, typedArray);
}
 
function formatRaw(ctx, value, recurseTimes, typedArray) {
  let keys;
  let protoProps;
  if (ctx.showHidden && (recurseTimes <= ctx.depth || ctx.depth === null)) {
    protoProps = [];
  }
 
  const constructor = getConstructorName(value, ctx, recurseTimes, protoProps);
  // Reset the variable to check for this later on.
  if (protoProps !== undefined && protoProps.length === 0) {
    protoProps = undefined;
  }
 
  let tag = value[SymbolToStringTag];
  // Only list the tag in case it's non-enumerable / not an own property.
  // Otherwise we'd print this twice.
  if (typeof tag !== 'string' ||
      (tag !== '' &&
      (ctx.showHidden ?
        ObjectPrototypeHasOwnProperty :
        ObjectPrototypePropertyIsEnumerable)(
        value, SymbolToStringTag
      ))) {
    tag = '';
  }
  let base = '';
  let formatter = getEmptyFormatArray;
  let braces;
  let noIterator = true;
  let i = 0;
  const filter = ctx.showHidden ? ALL_PROPERTIES : ONLY_ENUMERABLE;
 
  let extrasType = kObjectType;
 
  // Iterators and the rest are split to reduce checks.
  // We have to check all values in case the constructor is set to null.
  // Otherwise it would not possible to identify all types properly.
  if (value[SymbolIterator] || constructor === null) {
    noIterator = false;
    if (ArrayIsArray(value)) {
      // Only set the constructor for non ordinary ("Array [...]") arrays.
      const prefix = (constructor !== 'Array' || tag !== '') ?
        getPrefix(constructor, tag, 'Array', `(${value.length})`) :
        '';
      keys = getOwnNonIndexProperties(value, filter);
      braces = [`${prefix}[`, ']'];
      if (value.length === 0 && keys.length === 0 && protoProps === undefined)
        return `${braces[0]}]`;
      extrasType = kArrayExtrasType;
      formatter = formatArray;
    } else if (isSet(value)) {
      const size = setSizeGetter(value);
      const prefix = getPrefix(constructor, tag, 'Set', `(${size})`);
      keys = getKeys(value, ctx.showHidden);
      formatter = constructor !== null ?
        formatSet.bind(null, value) :
        formatSet.bind(null, SetPrototypeValues(value));
      if (size === 0 && keys.length === 0 && protoProps === undefined)
        return `${prefix}{}`;
      braces = [`${prefix}{`, '}'];
    } else if (isMap(value)) {
      const size = mapSizeGetter(value);
      const prefix = getPrefix(constructor, tag, 'Map', `(${size})`);
      keys = getKeys(value, ctx.showHidden);
      formatter = constructor !== null ?
        formatMap.bind(null, value) :
        formatMap.bind(null, MapPrototypeEntries(value));
      if (size === 0 && keys.length === 0 && protoProps === undefined)
        return `${prefix}{}`;
      braces = [`${prefix}{`, '}'];
    } else if (isTypedArray(value)) {
      keys = getOwnNonIndexProperties(value, filter);
      let bound = value;
      let fallback = '';
      if (constructor === null) {
        const constr = findTypedConstructor(value);
        fallback = constr.name;
        // Reconstruct the array information.
        bound = new constr(value);
      }
      const size = typedArraySizeGetter(value);
      const prefix = getPrefix(constructor, tag, fallback, `(${size})`);
      braces = [`${prefix}[`, ']'];
      if (value.length === 0 && keys.length === 0 && !ctx.showHidden)
        return `${braces[0]}]`;
      // Special handle the value. The original value is required below. The
      // bound function is required to reconstruct missing information.
      formatter = formatTypedArray.bind(null, bound, size);
      extrasType = kArrayExtrasType;
    } else if (isMapIterator(value)) {
      keys = getKeys(value, ctx.showHidden);
      braces = getIteratorBraces('Map', tag);
      // Add braces to the formatter parameters.
      formatter = formatIterator.bind(null, braces);
    } else if (isSetIterator(value)) {
      keys = getKeys(value, ctx.showHidden);
      braces = getIteratorBraces('Set', tag);
      // Add braces to the formatter parameters.
      formatter = formatIterator.bind(null, braces);
    } else {
      noIterator = true;
    }
  }
  if (noIterator) {
    keys = getKeys(value, ctx.showHidden);
    braces = ['{', '}'];
    if (constructor === 'Object') {
      if (isArgumentsObject(value)) {
        braces[0] = '[Arguments] {';
      } else if (tag !== '') {
        braces[0] = `${getPrefix(constructor, tag, 'Object')}{`;
      }
      if (keys.length === 0 && protoProps === undefined) {
        return `${braces[0]}}`;
      }
    } else if (typeof value === 'function') {
      base = getFunctionBase(value, constructor, tag);
      if (keys.length === 0 && protoProps === undefined)
        return ctx.stylize(base, 'special');
    } else if (isRegExp(value)) {
      // Make RegExps say that they are RegExps
      base = RegExpPrototypeToString(
        constructor !== null ? value : new RegExp(value)
      );
      const prefix = getPrefix(constructor, tag, 'RegExp');
      if (prefix !== 'RegExp ')
        base = `${prefix}${base}`;
      if ((keys.length === 0 && protoProps === undefined) ||
          (recurseTimes > ctx.depth && ctx.depth !== null)) {
        return ctx.stylize(base, 'regexp');
      }
    } else if (isDate(value)) {
      // Make dates with properties first say the date
      base = NumberIsNaN(DatePrototypeGetTime(value)) ?
        DatePrototypeToString(value) :
        DatePrototypeToISOString(value);
      const prefix = getPrefix(constructor, tag, 'Date');
      if (prefix !== 'Date ')
        base = `${prefix}${base}`;
      if (keys.length === 0 && protoProps === undefined) {
        return ctx.stylize(base, 'date');
      }
    } else if (isError(value)) {
      base = formatError(value, constructor, tag, ctx, keys);
      if (keys.length === 0 && protoProps === undefined)
        return base;
    } else if (isAnyArrayBuffer(value)) {
      // Fast path for ArrayBuffer and SharedArrayBuffer.
      // Can't do the same for DataView because it has a non-primitive
      // .buffer property that we need to recurse for.
      const arrayType = isArrayBuffer(value) ? 'ArrayBuffer' :
        'SharedArrayBuffer';
      const prefix = getPrefix(constructor, tag, arrayType);
      if (typedArray === undefined) {
        formatter = formatArrayBuffer;
      } else if (keys.length === 0 && protoProps === undefined) {
        return prefix +
              `{ byteLength: ${formatNumber(ctx.stylize, value.byteLength)} }`;
      }
      braces[0] = `${prefix}{`;
      keys.unshift('byteLength');
    } else if (isDataView(value)) {
      braces[0] = `${getPrefix(constructor, tag, 'DataView')}{`;
      // .buffer goes last, it's not a primitive like the others.
      keys.unshift('byteLength', 'byteOffset', 'buffer');
    } else if (isPromise(value)) {
      braces[0] = `${getPrefix(constructor, tag, 'Promise')}{`;
      formatter = formatPromise;
    } else if (isWeakSet(value)) {
      braces[0] = `${getPrefix(constructor, tag, 'WeakSet')}{`;
      formatter = ctx.showHidden ? formatWeakSet : formatWeakCollection;
    } else if (isWeakMap(value)) {
      braces[0] = `${getPrefix(constructor, tag, 'WeakMap')}{`;
      formatter = ctx.showHidden ? formatWeakMap : formatWeakCollection;
    } else if (isModuleNamespaceObject(value)) {
      braces[0] = `[${tag}] {`;
      // Special handle keys for namespace objects.
      formatter = formatNamespaceObject.bind(null, keys);
    } else if (isBoxedPrimitive(value)) {
      base = getBoxedBase(value, ctx, keys, constructor, tag);
      if (keys.length === 0 && protoProps === undefined) {
        return base;
      }
    } else {
      if (keys.length === 0 && protoProps === undefined) {
        if (isExternal(value))
          return ctx.stylize('[External]', 'special');
        return `${getCtxStyle(value, constructor, tag)}{}`;
      }
      braces[0] = `${getCtxStyle(value, constructor, tag)}{`;
    }
  }
 
  if (recurseTimes > ctx.depth && ctx.depth !== null) {
    let constructorName = getCtxStyle(value, constructor, tag).slice(0, -1);
    if (constructor !== null)
      constructorName = `[${constructorName}]`;
    return ctx.stylize(constructorName, 'special');
  }
  recurseTimes += 1;
 
  ctx.seen.push(value);
  ctx.currentDepth = recurseTimes;
  let output;
  const indentationLvl = ctx.indentationLvl;
  try {
    output = formatter(ctx, value, recurseTimes);
    for (i = 0; i < keys.length; i++) {
      output.push(
        formatProperty(ctx, value, recurseTimes, keys[i], extrasType));
    }
    if (protoProps !== undefined) {
      output.push(...protoProps);
    }
  } catch (err) {
    const constructorName = getCtxStyle(value, constructor, tag).slice(0, -1);
    return handleMaxCallStackSize(ctx, err, constructorName, indentationLvl);
  }
  if (ctx.circular !== undefined) {
    const index = ctx.circular.get(value);
    if (index !== undefined) {
      const reference = ctx.stylize(`<ref *${index}>`, 'special');
      // Add reference always to the very beginning of the output.
      if (ctx.compact !== true) {
        base = base === '' ? reference : `${reference} ${base}`;
      } else {
        braces[0] = `${reference} ${braces[0]}`;
      }
    }
  }
  ctx.seen.pop();
 
  if (ctx.sorted) {
    const comparator = ctx.sorted === true ? undefined : ctx.sorted;
    if (extrasType === kObjectType) {
      output = output.sort(comparator);
    } else if (keys.length > 1) {
      const sorted = output.slice(output.length - keys.length).sort(comparator);
      output.splice(output.length - keys.length, keys.length, ...sorted);
    }
  }
 
  const res = reduceToSingleString(
    ctx, output, base, braces, extrasType, recurseTimes, value);
  const budget = ctx.budget[ctx.indentationLvl] || 0;
  const newLength = budget + res.length;
  ctx.budget[ctx.indentationLvl] = newLength;
  // If any indentationLvl exceeds this limit, limit further inspecting to the
  // minimum. Otherwise the recursive algorithm might continue inspecting the
  // object even though the maximum string size (~2 ** 28 on 32 bit systems and
  // ~2 ** 30 on 64 bit systems) exceeded. The actual output is not limited at
  // exactly 2 ** 27 but a bit higher. This depends on the object shape.
  // This limit also makes sure that huge objects don't block the event loop
  // significantly.
  if (newLength > 2 ** 27) {
    ctx.depth = -1;
  }
  return res;
}
 
function getIteratorBraces(type, tag) {
  if (tag !== `${type} Iterator`) {
    if (tag !== '')
      tag += '] [';
    tag += `${type} Iterator`;
  }
  return [`[${tag}] {`, '}'];
}
 
function getBoxedBase(value, ctx, keys, constructor, tag) {
  let fn;
  let type;
  if (isNumberObject(value)) {
    fn = NumberPrototypeValueOf;
    type = 'Number';
  } else if (isStringObject(value)) {
    fn = StringPrototypeValueOf;
    type = 'String';
    // For boxed Strings, we have to remove the 0-n indexed entries,
    // since they just noisy up the output and are redundant
    // Make boxed primitive Strings look like such
    keys.splice(0, value.length);
  } else if (isBooleanObject(value)) {
    fn = BooleanPrototypeValueOf;
    type = 'Boolean';
  } else if (isBigIntObject(value)) {
    fn = BigIntPrototypeValueOf;
    type = 'BigInt';
  } else {
    fn = SymbolPrototypeValueOf;
    type = 'Symbol';
  }
  let base = `[${type}`;
  if (type !== constructor) {
    if (constructor === null) {
      base += ' (null prototype)';
    } else {
      base += ` (${constructor})`;
    }
  }
  base += `: ${formatPrimitive(stylizeNoColor, fn(value), ctx)}]`;
  if (tag !== '' && tag !== constructor) {
    base += ` [${tag}]`;
  }
  if (keys.length !== 0 || ctx.stylize === stylizeNoColor)
    return base;
  return ctx.stylize(base, type.toLowerCase());
}
 
function getFunctionBase(value, constructor, tag) {
  let type = 'Function';
  if (isGeneratorFunction(value)) {
    type = `Generator${type}`;
  }
  if (isAsyncFunction(value)) {
    type = `Async${type}`;
  }
  let base = `[${type}`;
  if (constructor === null) {
    base += ' (null prototype)';
  }
  if (value.name === '') {
    base += ' (anonymous)';
  } else {
    base += `: ${value.name}`;
  }
  base += ']';
  if (constructor !== type && constructor !== null) {
    base += ` ${constructor}`;
  }
  if (tag !== '' && constructor !== tag) {
    base += ` [${tag}]`;
  }
  return base;
}
 
function formatError(err, constructor, tag, ctx, keys) {
  const name = err.name != null ? String(err.name) : 'Error';
  let len = name.length;
  let stack = err.stack ? String(err.stack) : ErrorPrototypeToString(err);
 
  // Do not "duplicate" error properties that are already included in the output
  // otherwise.
  if (!ctx.showHidden && keys.length !== 0) {
    for (const name of ['name', 'message', 'stack']) {
      const index = keys.indexOf(name);
      // Only hide the property in case it's part of the original stack
      if (index !== -1 && stack.includes(err[name])) {
        keys.splice(index, 1);
      }
    }
  }
 
  // A stack trace may contain arbitrary data. Only manipulate the output
  // for "regular errors" (errors that "look normal") for now.
  if (constructor === null ||
      (name.endsWith('Error') &&
      stack.startsWith(name) &&
      (stack.length === len || stack[len] === ':' || stack[len] === '\n'))) {
    let fallback = 'Error';
    if (constructor === null) {
      const start = stack.match(/^([A-Z][a-z_ A-Z0-9[\]()-]+)(?::|\n {4}at)/) ||
        stack.match(/^([a-z_A-Z0-9-]*Error)$/);
      fallback = (start && start[1]) || '';
      len = fallback.length;
      fallback = fallback || 'Error';
    }
    const prefix = getPrefix(constructor, tag, fallback).slice(0, -1);
    if (name !== prefix) {
      if (prefix.includes(name)) {
        if (len === 0) {
          stack = `${prefix}: ${stack}`;
        } else {
          stack = `${prefix}${stack.slice(len)}`;
        }
      } else {
        stack = `${prefix} [${name}]${stack.slice(len)}`;
      }
    }
  }
  // Ignore the error message if it's contained in the stack.
  let pos = (err.message && stack.indexOf(err.message)) || -1;
  if (pos !== -1)
    pos += err.message.length;
  // Wrap the error in brackets in case it has no stack trace.
  const stackStart = stack.indexOf('\n    at', pos);
  if (stackStart === -1) {
    stack = `[${stack}]`;
  } else if (ctx.colors) {
    // Highlight userland code and node modules.
    let newStack = stack.slice(0, stackStart);
    const lines = stack.slice(stackStart + 1).split('\n');
    for (const line of lines) {
      const core = line.match(coreModuleRegExp);
      if (core !== null && NativeModule.exists(core[1])) {
        newStack += `\n${ctx.stylize(line, 'undefined')}`;
      } else {
        // This adds underscores to all node_modules to quickly identify them.
        let nodeModule;
        newStack += '\n';
        let pos = 0;
        while (nodeModule = nodeModulesRegExp.exec(line)) {
          // '/node_modules/'.length === 14
          newStack += line.slice(pos, nodeModule.index + 14);
          newStack += ctx.stylize(nodeModule[1], 'module');
          pos = nodeModule.index + nodeModule[0].length;
        }
        newStack += pos === 0 ? line : line.slice(pos);
      }
    }
    stack = newStack;
  }
  // The message and the stack have to be indented as well!
  if (ctx.indentationLvl !== 0) {
    const indentation = ' '.repeat(ctx.indentationLvl);
    stack = stack.replace(/\n/g, `\n${indentation}`);
  }
  return stack;
}
 
function groupArrayElements(ctx, output, value) {
  let totalLength = 0;
  let maxLength = 0;
  let i = 0;
  let outputLength = output.length;
  if (ctx.maxArrayLength < output.length) {
    // This makes sure the "... n more items" part is not taken into account.
    outputLength--;
  }
  const separatorSpace = 2; // Add 1 for the space and 1 for the separator.
  const dataLen = new Array(outputLength);
  // Calculate the total length of all output entries and the individual max
  // entries length of all output entries. We have to remove colors first,
  // otherwise the length would not be calculated properly.
  for (; i < outputLength; i++) {
    const len = getStringWidth(output[i], ctx.colors);
    dataLen[i] = len;
    totalLength += len + separatorSpace;
    if (maxLength < len)
      maxLength = len;
  }
  // Add two to `maxLength` as we add a single whitespace character plus a comma
  // in-between two entries.
  const actualMax = maxLength + separatorSpace;
  // Check if at least three entries fit next to each other and prevent grouping
  // of arrays that contains entries of very different length (i.e., if a single
  // entry is longer than 1/5 of all other entries combined). Otherwise the
  // space in-between small entries would be enormous.
  if (actualMax * 3 + ctx.indentationLvl < ctx.breakLength &&
      (totalLength / actualMax > 5 || maxLength <= 6)) {
 
    const approxCharHeights = 2.5;
    const averageBias = MathSqrt(actualMax - totalLength / output.length);
    const biasedMax = MathMax(actualMax - 3 - averageBias, 1);
    // Dynamically check how many columns seem possible.
    const columns = MathMin(
      // Ideally a square should be drawn. We expect a character to be about 2.5
      // times as high as wide. This is the area formula to calculate a square
      // which contains n rectangles of size `actualMax * approxCharHeights`.
      // Divide that by `actualMax` to receive the correct number of columns.
      // The added bias increases the columns for short entries.
      MathRound(
        MathSqrt(
          approxCharHeights * biasedMax * outputLength
        ) / biasedMax
      ),
      // Do not exceed the breakLength.
      MathFloor((ctx.breakLength - ctx.indentationLvl) / actualMax),
      // Limit array grouping for small `compact` modes as the user requested
      // minimal grouping.
      ctx.compact * 4,
      // Limit the columns to a maximum of fifteen.
      15
    );
    // Return with the original output if no grouping should happen.
    if (columns <= 1) {
      return output;
    }
    const tmp = [];
    const maxLineLength = [];
    for (let i = 0; i < columns; i++) {
      let lineMaxLength = 0;
      for (let j = i; j < output.length; j += columns) {
        if (dataLen[j] > lineMaxLength)
          lineMaxLength = dataLen[j];
      }
      lineMaxLength += separatorSpace;
      maxLineLength[i] = lineMaxLength;
    }
    let order = 'padStart';
    if (value !== undefined) {
      for (let i = 0; i < output.length; i++) {
        if (typeof value[i] !== 'number' && typeof value[i] !== 'bigint') {
          order = 'padEnd';
          break;
        }
      }
    }
    // Each iteration creates a single line of grouped entries.
    for (let i = 0; i < outputLength; i += columns) {
      // The last lines may contain less entries than columns.
      const max = MathMin(i + columns, outputLength);
      let str = '';
      let j = i;
      for (; j < max - 1; j++) {
        // Calculate extra color padding in case it's active. This has to be
        // done line by line as some lines might contain more colors than
        // others.
        const padding = maxLineLength[j - i] + output[j].length - dataLen[j];
        str += `${output[j]}, `[order](padding, ' ');
      }
      if (order === 'padStart') {
        const padding = maxLineLength[j - i] +
                        output[j].length -
                        dataLen[j] -
                        separatorSpace;
        str += output[j].padStart(padding, ' ');
      } else {
        str += output[j];
      }
      tmp.push(str);
    }
    if (ctx.maxArrayLength < output.length) {
      tmp.push(output[outputLength]);
    }
    output = tmp;
  }
  return output;
}
 
function handleMaxCallStackSize(ctx, err, constructorName, indentationLvl) {
  if (isStackOverflowError(err)) {
    ctx.seen.pop();
    ctx.indentationLvl = indentationLvl;
    return ctx.stylize(
      `[${constructorName}: Inspection interrupted ` +
        'prematurely. Maximum call stack size exceeded.]',
      'special'
    );
  }
  throw err;
}
 
function formatNumber(fn, value) {
  // Format -0 as '-0'. Checking `value === -0` won't distinguish 0 from -0.
  return fn(ObjectIs(value, -0) ? '-0' : `${value}`, 'number');
}
 
function formatBigInt(fn, value) {
  return fn(`${value}n`, 'bigint');
}
 
function formatPrimitive(fn, value, ctx) {
  if (typeof value === 'string') {
    if (ctx.compact !== true &&
        // TODO(BridgeAR): Add unicode support. Use the readline getStringWidth
        // function.
        value.length > kMinLineLength &&
        value.length > ctx.breakLength - ctx.indentationLvl - 4) {
      return value
        .split(/(?<=\n)/)
        .map((line) => fn(strEscape(line), 'string'))
        .join(` +\n${' '.repeat(ctx.indentationLvl + 2)}`);
    }
    return fn(strEscape(value), 'string');
  }
  if (typeof value === 'number')
    return formatNumber(fn, value);
  if (typeof value === 'bigint')
    return formatBigInt(fn, value);
  if (typeof value === 'boolean')
    return fn(`${value}`, 'boolean');
  if (typeof value === 'undefined')
    return fn('undefined', 'undefined');
  // es6 symbol primitive
  return fn(SymbolPrototypeToString(value), 'symbol');
}
 
function formatNamespaceObject(keys, ctx, value, recurseTimes) {
  const output = new Array(keys.length);
  for (let i = 0; i < keys.length; i++) {
    try {
      output[i] = formatProperty(ctx, value, recurseTimes, keys[i],
                                 kObjectType);
    } catch (err) {
      if (!(isNativeError(err) && err.name === 'ReferenceError')) {
        throw err;
      }
      // Use the existing functionality. This makes sure the indentation and
      // line breaks are always correct. Otherwise it is very difficult to keep
      // this aligned, even though this is a hacky way of dealing with this.
      const tmp = { [keys[i]]: '' };
      output[i] = formatProperty(ctx, tmp, recurseTimes, keys[i], kObjectType);
      const pos = output[i].lastIndexOf(' ');
      // We have to find the last whitespace and have to replace that value as
      // it will be visualized as a regular string.
      output[i] = output[i].slice(0, pos + 1) +
                  ctx.stylize('<uninitialized>', 'special');
    }
  }
  // Reset the keys to an empty array. This prevents duplicated inspection.
  keys.length = 0;
  return output;
}
 
// The array is sparse and/or has extra keys
function formatSpecialArray(ctx, value, recurseTimes, maxLength, output, i) {
  const keys = ObjectKeys(value);
  let index = i;
  for (; i < keys.length && output.length < maxLength; i++) {
    const key = keys[i];
    const tmp = +key;
    // Arrays can only have up to 2^32 - 1 entries
    if (tmp > 2 ** 32 - 2) {
      break;
    }
    if (`${index}` !== key) {
      if (!numberRegExp.test(key)) {
        break;
      }
      const emptyItems = tmp - index;
      const ending = emptyItems > 1 ? 's' : '';
      const message = `<${emptyItems} empty item${ending}>`;
      output.push(ctx.stylize(message, 'undefined'));
      index = tmp;
      if (output.length === maxLength) {
        break;
      }
    }
    output.push(formatProperty(ctx, value, recurseTimes, key, kArrayType));
    index++;
  }
  const remaining = value.length - index;
  if (output.length !== maxLength) {
    if (remaining > 0) {
      const ending = remaining > 1 ? 's' : '';
      const message = `<${remaining} empty item${ending}>`;
      output.push(ctx.stylize(message, 'undefined'));
    }
  } else if (remaining > 0) {
    output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);
  }
  return output;
}
 
function formatArrayBuffer(ctx, value) {
  let buffer;
  try {
    buffer = new Uint8Array(value);
  } catch {
    return [ctx.stylize('(detached)', 'special')];
  }
  if (hexSlice === undefined)
    hexSlice = uncurryThis(require('buffer').Buffer.prototype.hexSlice);
  let str = hexSlice(buffer, 0, MathMin(ctx.maxArrayLength, buffer.length))
    .replace(/(.{2})/g, '$1 ').trim();
  const remaining = buffer.length - ctx.maxArrayLength;
  if (remaining > 0)
    str += ` ... ${remaining} more byte${remaining > 1 ? 's' : ''}`;
  return [`${ctx.stylize('[Uint8Contents]', 'special')}: <${str}>`];
}
 
function formatArray(ctx, value, recurseTimes) {
  const valLen = value.length;
  const len = MathMin(MathMax(0, ctx.maxArrayLength), valLen);
 
  const remaining = valLen - len;
  const output = [];
  for (let i = 0; i < len; i++) {
    // Special handle sparse arrays.
    if (!ObjectPrototypeHasOwnProperty(value, i)) {
      return formatSpecialArray(ctx, value, recurseTimes, len, output, i);
    }
    output.push(formatProperty(ctx, value, recurseTimes, i, kArrayType));
  }
  if (remaining > 0)
    output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);
  return output;
}
 
function formatTypedArray(value, length, ctx, ignored, recurseTimes) {
  const maxLength = MathMin(MathMax(0, ctx.maxArrayLength), length);
  const remaining = value.length - maxLength;
  const output = new Array(maxLength);
  const elementFormatter = value.length > 0 && typeof value[0] === 'number' ?
    formatNumber :
    formatBigInt;
  for (let i = 0; i < maxLength; ++i)
    output[i] = elementFormatter(ctx.stylize, value[i]);
  if (remaining > 0) {
    output[maxLength] = `... ${remaining} more item${remaining > 1 ? 's' : ''}`;
  }
  if (ctx.showHidden) {
    // .buffer goes last, it's not a primitive like the others.
    // All besides `BYTES_PER_ELEMENT` are actually getters.
    ctx.indentationLvl += 2;
    for (const key of [
      'BYTES_PER_ELEMENT',
      'length',
      'byteLength',
      'byteOffset',
      'buffer'
    ]) {
      const str = formatValue(ctx, value[key], recurseTimes, true);
      output.push(`[${key}]: ${str}`);
    }
    ctx.indentationLvl -= 2;
  }
  return output;
}
 
function formatSet(value, ctx, ignored, recurseTimes) {
  const output = [];
  ctx.indentationLvl += 2;
  for (const v of value) {
    output.push(formatValue(ctx, v, recurseTimes));
  }
  ctx.indentationLvl -= 2;
  return output;
}
 
function formatMap(value, ctx, ignored, recurseTimes) {
  const output = [];
  ctx.indentationLvl += 2;
  for (const [k, v] of value) {
    output.push(`${formatValue(ctx, k, recurseTimes)} => ` +
                formatValue(ctx, v, recurseTimes));
  }
  ctx.indentationLvl -= 2;
  return output;
}
 
function formatSetIterInner(ctx, recurseTimes, entries, state) {
  const maxArrayLength = MathMax(ctx.maxArrayLength, 0);
  const maxLength = MathMin(maxArrayLength, entries.length);
  let output = new Array(maxLength);
  ctx.indentationLvl += 2;
  for (let i = 0; i < maxLength; i++) {
    output[i] = formatValue(ctx, entries[i], recurseTimes);
  }
  ctx.indentationLvl -= 2;
  if (state === kWeak && !ctx.sorted) {
    // Sort all entries to have a halfway reliable output (if more entries than
    // retrieved ones exist, we can not reliably return the same output) if the
    // output is not sorted anyway.
    output = output.sort();
  }
  const remaining = entries.length - maxLength;
  if (remaining > 0) {
    output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);
  }
  return output;
}
 
function formatMapIterInner(ctx, recurseTimes, entries, state) {
  const maxArrayLength = MathMax(ctx.maxArrayLength, 0);
  // Entries exist as [key1, val1, key2, val2, ...]
  const len = entries.length / 2;
  const remaining = len - maxArrayLength;
  const maxLength = MathMin(maxArrayLength, len);
  let output = new Array(maxLength);
  let i = 0;
  ctx.indentationLvl += 2;
  if (state === kWeak) {
    for (; i < maxLength; i++) {
      const pos = i * 2;
      output[i] = `${formatValue(ctx, entries[pos], recurseTimes)}` +
        ` => ${formatValue(ctx, entries[pos + 1], recurseTimes)}`;
    }
    // Sort all entries to have a halfway reliable output (if more entries than
    // retrieved ones exist, we can not reliably return the same output) if the
    // output is not sorted anyway.
    if (!ctx.sorted)
      output = output.sort();
  } else {
    for (; i < maxLength; i++) {
      const pos = i * 2;
      const res = [
        formatValue(ctx, entries[pos], recurseTimes),
        formatValue(ctx, entries[pos + 1], recurseTimes)
      ];
      output[i] = reduceToSingleString(
        ctx, res, '', ['[', ']'], kArrayExtrasType, recurseTimes);
    }
  }
  ctx.indentationLvl -= 2;
  if (remaining > 0) {
    output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);
  }
  return output;
}
 
function formatWeakCollection(ctx) {
  return [ctx.stylize('<items unknown>', 'special')];
}
 
function formatWeakSet(ctx, value, recurseTimes) {
  const entries = previewEntries(value);
  return formatSetIterInner(ctx, recurseTimes, entries, kWeak);
}
 
function formatWeakMap(ctx, value, recurseTimes) {
  const entries = previewEntries(value);
  return formatMapIterInner(ctx, recurseTimes, entries, kWeak);
}
 
function formatIterator(braces, ctx, value, recurseTimes) {
  const [entries, isKeyValue] = previewEntries(value, true);
  if (isKeyValue) {
    // Mark entry iterators as such.
    braces[0] = braces[0].replace(/ Iterator] {$/, ' Entries] {');
    return formatMapIterInner(ctx, recurseTimes, entries, kMapEntries);
  }
 
  return formatSetIterInner(ctx, recurseTimes, entries, kIterator);
}
 
function formatPromise(ctx, value, recurseTimes) {
  let output;
  const [state, result] = getPromiseDetails(value);
  if (state === kPending) {
    output = [ctx.stylize('<pending>', 'special')];
  } else {
    ctx.indentationLvl += 2;
    const str = formatValue(ctx, result, recurseTimes);
    ctx.indentationLvl -= 2;
    output = [
      state === kRejected ?
        `${ctx.stylize('<rejected>', 'special')} ${str}` :
        str
    ];
  }
  return output;
}
 
function formatProperty(ctx, value, recurseTimes, key, type, desc) {
  let name, str;
  let extra = ' ';
  desc = desc || ObjectGetOwnPropertyDescriptor(value, key) ||
    { value: value[key], enumerable: true };
  if (desc.value !== undefined) {
    const diff = (ctx.compact !== true || type !== kObjectType) ? 2 : 3;
    ctx.indentationLvl += diff;
    str = formatValue(ctx, desc.value, recurseTimes);
    if (diff === 3 && ctx.breakLength < getStringWidth(str, ctx.colors)) {
      extra = `\n${' '.repeat(ctx.indentationLvl)}`;
    }
    ctx.indentationLvl -= diff;
  } else if (desc.get !== undefined) {
    const label = desc.set !== undefined ? 'Getter/Setter' : 'Getter';
    const s = ctx.stylize;
    const sp = 'special';
    if (ctx.getters && (ctx.getters === true ||
          (ctx.getters === 'get' && desc.set === undefined) ||
          (ctx.getters === 'set' && desc.set !== undefined))) {
      try {
        const tmp = value[key];
        ctx.indentationLvl += 2;
        if (tmp === null) {
          str = `${s(`[${label}:`, sp)} ${s('null', 'null')}${s(']', sp)}`;
        } else if (typeof tmp === 'object') {
          str = `${s(`[${label}]`, sp)} ${formatValue(ctx, tmp, recurseTimes)}`;
        } else {
          const primitive = formatPrimitive(s, tmp, ctx);
          str = `${s(`[${label}:`, sp)} ${primitive}${s(']', sp)}`;
        }
        ctx.indentationLvl -= 2;
      } catch (err) {
        const message = `<Inspection threw (${err.message})>`;
        str = `${s(`[${label}:`, sp)} ${message}${s(']', sp)}`;
      }
    } else {
      str = ctx.stylize(`[${label}]`, sp);
    }
  } else if (desc.set !== undefined) {
    str = ctx.stylize('[Setter]', 'special');
  } else {
    str = ctx.stylize('undefined', 'undefined');
  }
  if (type === kArrayType) {
    return str;
  }
  if (typeof key === 'symbol') {
    const tmp = key.toString().replace(strEscapeSequencesReplacer, escapeFn);
    name = `[${ctx.stylize(tmp, 'symbol')}]`;
  } else if (desc.enumerable === false) {
    name = `[${key.replace(strEscapeSequencesReplacer, escapeFn)}]`;
  } else if (keyStrRegExp.test(key)) {
    name = ctx.stylize(key, 'name');
  } else {
    name = ctx.stylize(strEscape(key), 'string');
  }
  return `${name}:${extra}${str}`;
}
 
function isBelowBreakLength(ctx, output, start, base) {
  // Each entry is separated by at least a comma. Thus, we start with a total
  // length of at least `output.length`. In addition, some cases have a
  // whitespace in-between each other that is added to the total as well.
  // TODO(BridgeAR): Add unicode support. Use the readline getStringWidth
  // function. Check the performance overhead and make it an opt-in in case it's
  // significant.
  let totalLength = output.length + start;
  if (totalLength + output.length > ctx.breakLength)
    return false;
  for (let i = 0; i < output.length; i++) {
    if (ctx.colors) {
      totalLength += removeColors(output[i]).length;
    } else {
      totalLength += output[i].length;
    }
    if (totalLength > ctx.breakLength) {
      return false;
    }
  }
  // Do not line up properties on the same line if `base` contains line breaks.
  return base === '' || !base.includes('\n');
}
 
function reduceToSingleString(
  ctx, output, base, braces, extrasType, recurseTimes, value) {
  if (ctx.compact !== true) {
    if (typeof ctx.compact === 'number' && ctx.compact >= 1) {
      // Memorize the original output length. In case the the output is grouped,
      // prevent lining up the entries on a single line.
      const entries = output.length;
      // Group array elements together if the array contains at least six
      // separate entries.
      if (extrasType === kArrayExtrasType && entries > 6) {
        output = groupArrayElements(ctx, output, value);
      }
      // `ctx.currentDepth` is set to the most inner depth of the currently
      // inspected object part while `recurseTimes` is the actual current depth
      // that is inspected.
      //
      // Example:
      //
      // const a = { first: [ 1, 2, 3 ], second: { inner: [ 1, 2, 3 ] } }
      //
      // The deepest depth of `a` is 2 (a.second.inner) and `a.first` has a max
      // depth of 1.
      //
      // Consolidate all entries of the local most inner depth up to
      // `ctx.compact`, as long as the properties are smaller than
      // `ctx.breakLength`.
      if (ctx.currentDepth - recurseTimes < ctx.compact &&
          entries === output.length) {
        // Line up all entries on a single line in case the entries do not
        // exceed `breakLength`. Add 10 as constant to start next to all other
        // factors that may reduce `breakLength`.
        const start = output.length + ctx.indentationLvl +
                      braces[0].length + base.length + 10;
        if (isBelowBreakLength(ctx, output, start, base)) {
          return `${base ? `${base} ` : ''}${braces[0]} ${join(output, ', ')}` +
            ` ${braces[1]}`;
        }
      }
    }
    // Line up each entry on an individual line.
    const indentation = `\n${' '.repeat(ctx.indentationLvl)}`;
    return `${base ? `${base} ` : ''}${braces[0]}${indentation}  ` +
      `${join(output, `,${indentation}  `)}${indentation}${braces[1]}`;
  }
  // Line up all entries on a single line in case the entries do not exceed
  // `breakLength`.
  if (isBelowBreakLength(ctx, output, 0, base)) {
    return `${braces[0]}${base ? ` ${base}` : ''} ${join(output, ', ')} ` +
      braces[1];
  }
  const indentation = ' '.repeat(ctx.indentationLvl);
  // If the opening "brace" is too large, like in the case of "Set {",
  // we need to force the first item to be on the next line or the
  // items will not line up correctly.
  const ln = base === '' && braces[0].length === 1 ?
    ' ' : `${base ? ` ${base}` : ''}\n${indentation}  `;
  // Line up each entry on an individual line.
  return `${braces[0]}${ln}${join(output, `,\n${indentation}  `)} ${braces[1]}`;
}
 
function hasBuiltInToString(value) {
  // Prevent triggering proxy traps.
  const getFullProxy = false;
  const proxyTarget = getProxyDetails(value, getFullProxy);
  if (proxyTarget !== undefined) {
    value = proxyTarget;
  }
 
  // Count objects that have no `toString` function as built-in.
  if (typeof value.toString !== 'function') {
    return true;
  }
 
  // The object has a own `toString` property. Thus it's not not a built-in one.
  if (ObjectPrototypeHasOwnProperty(value, 'toString')) {
    return false;
  }
 
  // Find the object that has the `toString` property as own property in the
  // prototype chain.
  let pointer = value;
  do {
    pointer = ObjectGetPrototypeOf(pointer);
  } while (!ObjectPrototypeHasOwnProperty(pointer, 'toString'));
 
  // Check closer if the object is a built-in.
  const descriptor = ObjectGetOwnPropertyDescriptor(pointer, 'constructor');
  return descriptor !== undefined &&
    typeof descriptor.value === 'function' &&
    builtInObjects.has(descriptor.value.name);
}
 
const firstErrorLine = (error) => error.message.split('\n')[0];
let CIRCULAR_ERROR_MESSAGE;
function tryStringify(arg) {
  try {
    return JSONStringify(arg);
  } catch (err) {
    // Populate the circular error message lazily
    if (!CIRCULAR_ERROR_MESSAGE) {
      try {
        const a = {}; a.a = a; JSONStringify(a);
      } catch (err) {
        CIRCULAR_ERROR_MESSAGE = firstErrorLine(err);
      }
    }
    if (err.name === 'TypeError' &&
        firstErrorLine(err) === CIRCULAR_ERROR_MESSAGE) {
      return '[Circular]';
    }
    throw err;
  }
}
 
function format(...args) {
  return formatWithOptionsInternal(undefined, ...args);
}
 
function formatWithOptions(inspectOptions, ...args) {
  if (typeof inspectOptions !== 'object' || inspectOptions === null) {
    throw new ERR_INVALID_ARG_TYPE(
      'inspectOptions', 'object', inspectOptions);
  }
  return formatWithOptionsInternal(inspectOptions, ...args);
}
 
function formatWithOptionsInternal(inspectOptions, ...args) {
  const first = args[0];
  let a = 0;
  let str = '';
  let join = '';
 
  if (typeof first === 'string') {
    if (args.length === 1) {
      return first;
    }
    let tempStr;
    let lastPos = 0;
 
    for (let i = 0; i < first.length - 1; i++) {
      if (first.charCodeAt(i) === 37) { // '%'
        const nextChar = first.charCodeAt(++i);
        if (a + 1 !== args.length) {
          switch (nextChar) {
            case 115: // 's'
              const tempArg = args[++a];
              if (typeof tempArg === 'number') {
                tempStr = formatNumber(stylizeNoColor, tempArg);
              } else if (typeof tempArg === 'bigint') {
                tempStr = `${tempArg}n`;
              } else if (typeof tempArg !== 'object' ||
                         tempArg === null ||
                         !hasBuiltInToString(tempArg)) {
                tempStr = String(tempArg);
              } else {
                tempStr = inspect(tempArg, {
                  ...inspectOptions,
                  compact: 3,
                  colors: false,
                  depth: 0
                });
              }
              break;
            case 106: // 'j'
              tempStr = tryStringify(args[++a]);
              break;
            case 100: // 'd'
              const tempNum = args[++a];
              if (typeof tempNum === 'bigint') {
                tempStr = `${tempNum}n`;
              } else if (typeof tempNum === 'symbol') {
                tempStr = 'NaN';
              } else {
                tempStr = formatNumber(stylizeNoColor, Number(tempNum));
              }
              break;
            case 79: // 'O'
              tempStr = inspect(args[++a], inspectOptions);
              break;
            case 111: // 'o'
              tempStr = inspect(args[++a], {
                ...inspectOptions,
                showHidden: true,
                showProxy: true,
                depth: 4
              });
              break;
            case 105: // 'i'
              const tempInteger = args[++a];
              if (typeof tempInteger === 'bigint') {
                tempStr = `${tempInteger}n`;
              } else if (typeof tempInteger === 'symbol') {
                tempStr = 'NaN';
              } else {
                tempStr = formatNumber(stylizeNoColor, parseInt(tempInteger));
              }
              break;
            case 102: // 'f'
              const tempFloat = args[++a];
              if (typeof tempFloat === 'symbol') {
                tempStr = 'NaN';
              } else {
                tempStr = formatNumber(stylizeNoColor, parseFloat(tempFloat));
              }
              break;
            case 99: // 'c'
              a += 1;
              tempStr = '';
              break;
            case 37: // '%'
              str += first.slice(lastPos, i);
              lastPos = i + 1;
              continue;
            default: // Any other character is not a correct placeholder
              continue;
          }
          if (lastPos !== i - 1) {
            str += first.slice(lastPos, i - 1);
          }
          str += tempStr;
          lastPos = i + 1;
        } else if (nextChar === 37) {
          str += first.slice(lastPos, i);
          lastPos = i + 1;
        }
      }
    }
    if (lastPos !== 0) {
      a++;
      join = ' ';
      if (lastPos < first.length) {
        str += first.slice(lastPos);
      }
    }
  }
 
  while (a < args.length) {
    const value = args[a];
    str += join;
    str += typeof value !== 'string' ? inspect(value, inspectOptions) : value;
    join = ' ';
    a++;
  }
  return str;
}
 
if (internalBinding('config').hasIntl) {
  const icu = internalBinding('icu');
  // icu.getStringWidth(string, ambiguousAsFullWidth, expandEmojiSequence)
  // Defaults: ambiguousAsFullWidth = false; expandEmojiSequence = true;
  // TODO(BridgeAR): Expose the options to the user. That is probably the
  // best thing possible at the moment, since it's difficult to know what
  // the receiving end supports.
  getStringWidth = function getStringWidth(str, removeControlChars = true) {
    let width = 0;
    if (removeControlChars)
      str = stripVTControlCharacters(str);
    for (let i = 0; i < str.length; i++) {
      // Try to avoid calling into C++ by first handling the ASCII portion of
      // the string. If it is fully ASCII, we skip the C++ part.
      const code = str.charCodeAt(i);
      if (code >= 127) {
        width += icu.getStringWidth(str.slice(i));
        break;
      }
      width += code >= 32 ? 1 : 0;
    }
    return width;
  };
} else {
  /**
   * Returns the number of columns required to display the given string.
   */
  getStringWidth = function getStringWidth(str, removeControlChars = true) {
    let width = 0;
 
    if (removeControlChars)
      str = stripVTControlCharacters(str);
 
    for (const char of str) {
      const code = char.codePointAt(0);
      if (isFullWidthCodePoint(code)) {
        width += 2;
      } else if (!isZeroWidthCodePoint(code)) {
        width++;
      }
    }
 
    return width;
  };
 
  /**
   * Returns true if the character represented by a given
   * Unicode code point is full-width. Otherwise returns false.
   */
  const isFullWidthCodePoint = (code) => {
    // Code points are partially derived from:
    // http://www.unicode.org/Public/UNIDATA/EastAsianWidth.txt
    return code >= 0x1100 && (
      code <= 0x115f ||  // Hangul Jamo
      code === 0x2329 || // LEFT-POINTING ANGLE BRACKET
      code === 0x232a || // RIGHT-POINTING ANGLE BRACKET
      // CJK Radicals Supplement .. Enclosed CJK Letters and Months
      (code >= 0x2e80 && code <= 0x3247 && code !== 0x303f) ||
      // Enclosed CJK Letters and Months .. CJK Unified Ideographs Extension A
      (code >= 0x3250 && code <= 0x4dbf) ||
      // CJK Unified Ideographs .. Yi Radicals
      (code >= 0x4e00 && code <= 0xa4c6) ||
      // Hangul Jamo Extended-A
      (code >= 0xa960 && code <= 0xa97c) ||
      // Hangul Syllables
      (code >= 0xac00 && code <= 0xd7a3) ||
      // CJK Compatibility Ideographs
      (code >= 0xf900 && code <= 0xfaff) ||
      // Vertical Forms
      (code >= 0xfe10 && code <= 0xfe19) ||
      // CJK Compatibility Forms .. Small Form Variants
      (code >= 0xfe30 && code <= 0xfe6b) ||
      // Halfwidth and Fullwidth Forms
      (code >= 0xff01 && code <= 0xff60) ||
      (code >= 0xffe0 && code <= 0xffe6) ||
      // Kana Supplement
      (code >= 0x1b000 && code <= 0x1b001) ||
      // Enclosed Ideographic Supplement
      (code >= 0x1f200 && code <= 0x1f251) ||
      // Miscellaneous Symbols and Pictographs 0x1f300 - 0x1f5ff
      // Emoticons 0x1f600 - 0x1f64f
      (code >= 0x1f300 && code <= 0x1f64f) ||
      // CJK Unified Ideographs Extension B .. Tertiary Ideographic Plane
      (code >= 0x20000 && code <= 0x3fffd)
    );
  };
 
  const isZeroWidthCodePoint = (code) => {
    return code <= 0x1F || // C0 control codes
      (code > 0x7F && code <= 0x9F) || // C1 control codes
      (code >= 0x300 && code <= 0x36F) || // Combining Diacritical Marks
      (code >= 0x200B && code <= 0x200F) || // Modifying Invisible Characters
      (code >= 0xFE00 && code <= 0xFE0F) || // Variation Selectors
      (code >= 0xFE20 && code <= 0xFE2F) || // Combining Half Marks
      (code >= 0xE0100 && code <= 0xE01EF); // Variation Selectors
  };
}
 
/**
 * Remove all VT control characters. Use to estimate displayed string width.
 */
function stripVTControlCharacters(str) {
  return str.replace(ansi, '');
}
 
module.exports = {
  inspect,
  format,
  formatWithOptions,
  getStringWidth,
  inspectDefaultOptions,
  stripVTControlCharacters
};