// Ported from js-yaml v3.13.1:
// https://github.com/nodeca/js-yaml/commit/665aadda42349dcae869f12040d9b10ef18d12da
// Copyright 2011-2015 by Vitaly Puzrin. All rights reserved. MIT license.
// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
import { YAMLError } from "../_error.ts";
import * as common from "../_utils.ts";
import { DumperState } from "./dumper_state.ts";
const _toString = Object.prototype.toString;
const { hasOwn } = Object;
const CHAR_TAB = 0x09; /* Tab */ 
const CHAR_LINE_FEED = 0x0a; /* LF */ 
const CHAR_SPACE = 0x20; /* Space */ 
const CHAR_EXCLAMATION = 0x21; /* ! */ 
const CHAR_DOUBLE_QUOTE = 0x22; /* " */ 
const CHAR_SHARP = 0x23; /* # */ 
const CHAR_PERCENT = 0x25; /* % */ 
const CHAR_AMPERSAND = 0x26; /* & */ 
const CHAR_SINGLE_QUOTE = 0x27; /* ' */ 
const CHAR_ASTERISK = 0x2a; /* * */ 
const CHAR_COMMA = 0x2c; /* , */ 
const CHAR_MINUS = 0x2d; /* - */ 
const CHAR_COLON = 0x3a; /* : */ 
const CHAR_GREATER_THAN = 0x3e; /* > */ 
const CHAR_QUESTION = 0x3f; /* ? */ 
const CHAR_COMMERCIAL_AT = 0x40; /* @ */ 
const CHAR_LEFT_SQUARE_BRACKET = 0x5b; /* [ */ 
const CHAR_RIGHT_SQUARE_BRACKET = 0x5d; /* ] */ 
const CHAR_GRAVE_ACCENT = 0x60; /* ` */ 
const CHAR_LEFT_CURLY_BRACKET = 0x7b; /* { */ 
const CHAR_VERTICAL_LINE = 0x7c; /* | */ 
const CHAR_RIGHT_CURLY_BRACKET = 0x7d; /* } */ 
const ESCAPE_SEQUENCES = {};
ESCAPE_SEQUENCES[0x00] = "\\0";
ESCAPE_SEQUENCES[0x07] = "\\a";
ESCAPE_SEQUENCES[0x08] = "\\b";
ESCAPE_SEQUENCES[0x09] = "\\t";
ESCAPE_SEQUENCES[0x0a] = "\\n";
ESCAPE_SEQUENCES[0x0b] = "\\v";
ESCAPE_SEQUENCES[0x0c] = "\\f";
ESCAPE_SEQUENCES[0x0d] = "\\r";
ESCAPE_SEQUENCES[0x1b] = "\\e";
ESCAPE_SEQUENCES[0x22] = '\\"';
ESCAPE_SEQUENCES[0x5c] = "\\\\";
ESCAPE_SEQUENCES[0x85] = "\\N";
ESCAPE_SEQUENCES[0xa0] = "\\_";
ESCAPE_SEQUENCES[0x2028] = "\\L";
ESCAPE_SEQUENCES[0x2029] = "\\P";
const DEPRECATED_BOOLEANS_SYNTAX = [
  "y",
  "Y",
  "yes",
  "Yes",
  "YES",
  "on",
  "On",
  "ON",
  "n",
  "N",
  "no",
  "No",
  "NO",
  "off",
  "Off",
  "OFF"
];
function encodeHex(character) {
  const string = character.toString(16).toUpperCase();
  let handle;
  let length;
  if (character <= 0xff) {
    handle = "x";
    length = 2;
  } else if (character <= 0xffff) {
    handle = "u";
    length = 4;
  } else if (character <= 0xffffffff) {
    handle = "U";
    length = 8;
  } else {
    throw new YAMLError("code point within a string may not be greater than 0xFFFFFFFF");
  }
  return `\\${handle}${common.repeat("0", length - string.length)}${string}`;
}
// Indents every line in a string. Empty lines (\n only) are not indented.
function indentString(string, spaces) {
  const ind = common.repeat(" ", spaces), length = string.length;
  let position = 0, next = -1, result = "", line;
  while(position < length){
    next = string.indexOf("\n", position);
    if (next === -1) {
      line = string.slice(position);
      position = length;
    } else {
      line = string.slice(position, next + 1);
      position = next + 1;
    }
    if (line.length && line !== "\n") result += ind;
    result += line;
  }
  return result;
}
function generateNextLine(state, level) {
  return `\n${common.repeat(" ", state.indent * level)}`;
}
function testImplicitResolving(state, str) {
  let type;
  for(let index = 0, length = state.implicitTypes.length; index < length; index += 1){
    type = state.implicitTypes[index];
    if (type.resolve(str)) {
      return true;
    }
  }
  return false;
}
// [33] s-white ::= s-space | s-tab
function isWhitespace(c) {
  return c === CHAR_SPACE || c === CHAR_TAB;
}
// Returns true if the character can be printed without escaping.
// From YAML 1.2: "any allowed characters known to be non-printable
// should also be escaped. [However,] This isn’t mandatory"
// Derived from nb-char - \t - #x85 - #xA0 - #x2028 - #x2029.
function isPrintable(c) {
  return 0x00020 <= c && c <= 0x00007e || 0x000a1 <= c && c <= 0x00d7ff && c !== 0x2028 && c !== 0x2029 || 0x0e000 <= c && c <= 0x00fffd && c !== 0xfeff || 0x10000 <= c && c <= 0x10ffff;
}
// Simplified test for values allowed after the first character in plain style.
function isPlainSafe(c) {
  // Uses a subset of nb-char - c-flow-indicator - ":" - "#"
  // where nb-char ::= c-printable - b-char - c-byte-order-mark.
  return isPrintable(c) && c !== 0xfeff && // - c-flow-indicator
  c !== CHAR_COMMA && c !== CHAR_LEFT_SQUARE_BRACKET && c !== CHAR_RIGHT_SQUARE_BRACKET && c !== CHAR_LEFT_CURLY_BRACKET && c !== CHAR_RIGHT_CURLY_BRACKET && // - ":" - "#"
  c !== CHAR_COLON && c !== CHAR_SHARP;
}
// Simplified test for values allowed as the first character in plain style.
function isPlainSafeFirst(c) {
  // Uses a subset of ns-char - c-indicator
  // where ns-char = nb-char - s-white.
  return isPrintable(c) && c !== 0xfeff && !isWhitespace(c) && // - s-white
  // - (c-indicator ::=
  // “-” | “?” | “:” | “,” | “[” | “]” | “{” | “}”
  c !== CHAR_MINUS && c !== CHAR_QUESTION && c !== CHAR_COLON && c !== CHAR_COMMA && c !== CHAR_LEFT_SQUARE_BRACKET && c !== CHAR_RIGHT_SQUARE_BRACKET && c !== CHAR_LEFT_CURLY_BRACKET && c !== CHAR_RIGHT_CURLY_BRACKET && // | “#” | “&” | “*” | “!” | “|” | “>” | “'” | “"”
  c !== CHAR_SHARP && c !== CHAR_AMPERSAND && c !== CHAR_ASTERISK && c !== CHAR_EXCLAMATION && c !== CHAR_VERTICAL_LINE && c !== CHAR_GREATER_THAN && c !== CHAR_SINGLE_QUOTE && c !== CHAR_DOUBLE_QUOTE && // | “%” | “@” | “`”)
  c !== CHAR_PERCENT && c !== CHAR_COMMERCIAL_AT && c !== CHAR_GRAVE_ACCENT;
}
// Determines whether block indentation indicator is required.
function needIndentIndicator(string) {
  const leadingSpaceRe = /^\n* /;
  return leadingSpaceRe.test(string);
}
const STYLE_PLAIN = 1, STYLE_SINGLE = 2, STYLE_LITERAL = 3, STYLE_FOLDED = 4, STYLE_DOUBLE = 5;
// Determines which scalar styles are possible and returns the preferred style.
// lineWidth = -1 => no limit.
// Pre-conditions: str.length > 0.
// Post-conditions:
//  STYLE_PLAIN or STYLE_SINGLE => no \n are in the string.
//  STYLE_LITERAL => no lines are suitable for folding (or lineWidth is -1).
//  STYLE_FOLDED => a line > lineWidth and can be folded (and lineWidth !== -1).
function chooseScalarStyle(string, singleLineOnly, indentPerLevel, lineWidth, testAmbiguousType) {
  const shouldTrackWidth = lineWidth !== -1;
  let hasLineBreak = false, hasFoldableLine = false, previousLineBreak = -1, plain = isPlainSafeFirst(string.charCodeAt(0)) && !isWhitespace(string.charCodeAt(string.length - 1));
  let char, i;
  if (singleLineOnly) {
    // Case: no block styles.
    // Check for disallowed characters to rule out plain and single.
    for(i = 0; i < string.length; i++){
      char = string.charCodeAt(i);
      if (!isPrintable(char)) {
        return STYLE_DOUBLE;
      }
      plain = plain && isPlainSafe(char);
    }
  } else {
    // Case: block styles permitted.
    for(i = 0; i < string.length; i++){
      char = string.charCodeAt(i);
      if (char === CHAR_LINE_FEED) {
        hasLineBreak = true;
        // Check if any line can be folded.
        if (shouldTrackWidth) {
          hasFoldableLine = hasFoldableLine || // Foldable line = too long, and not more-indented.
          i - previousLineBreak - 1 > lineWidth && string[previousLineBreak + 1] !== " ";
          previousLineBreak = i;
        }
      } else if (!isPrintable(char)) {
        return STYLE_DOUBLE;
      }
      plain = plain && isPlainSafe(char);
    }
    // in case the end is missing a \n
    hasFoldableLine = hasFoldableLine || shouldTrackWidth && i - previousLineBreak - 1 > lineWidth && string[previousLineBreak + 1] !== " ";
  }
  // Although every style can represent \n without escaping, prefer block styles
  // for multiline, since they're more readable and they don't add empty lines.
  // Also prefer folding a super-long line.
  if (!hasLineBreak && !hasFoldableLine) {
    // Strings interpretable as another type have to be quoted;
    // e.g. the string 'true' vs. the boolean true.
    return plain && !testAmbiguousType(string) ? STYLE_PLAIN : STYLE_SINGLE;
  }
  // Edge case: block indentation indicator can only have one digit.
  if (indentPerLevel > 9 && needIndentIndicator(string)) {
    return STYLE_DOUBLE;
  }
  // At this point we know block styles are valid.
  // Prefer literal style unless we want to fold.
  return hasFoldableLine ? STYLE_FOLDED : STYLE_LITERAL;
}
// Greedy line breaking.
// Picks the longest line under the limit each time,
// otherwise settles for the shortest line over the limit.
// NB. More-indented lines *cannot* be folded, as that would add an extra \n.
function foldLine(line, width) {
  if (line === "" || line[0] === " ") return line;
  // Since a more-indented line adds a \n, breaks can't be followed by a space.
  const breakRe = / [^ ]/g; // note: the match index will always be <= length-2.
  let match;
  // start is an inclusive index. end, curr, and next are exclusive.
  let start = 0, end, curr = 0, next = 0;
  let result = "";
  // Invariants: 0 <= start <= length-1.
  //   0 <= curr <= next <= max(0, length-2). curr - start <= width.
  // Inside the loop:
  //   A match implies length >= 2, so curr and next are <= length-2.
  // tslint:disable-next-line:no-conditional-assignment
  while(match = breakRe.exec(line)){
    next = match.index;
    // maintain invariant: curr - start <= width
    if (next - start > width) {
      end = curr > start ? curr : next; // derive end <= length-2
      result += `\n${line.slice(start, end)}`;
      // skip the space that was output as \n
      start = end + 1; // derive start <= length-1
    }
    curr = next;
  }
  // By the invariants, start <= length-1, so there is something left over.
  // It is either the whole string or a part starting from non-whitespace.
  result += "\n";
  // Insert a break if the remainder is too long and there is a break available.
  if (line.length - start > width && curr > start) {
    result += `${line.slice(start, curr)}\n${line.slice(curr + 1)}`;
  } else {
    result += line.slice(start);
  }
  return result.slice(1); // drop extra \n joiner
}
// (See the note for writeScalar.)
function dropEndingNewline(string) {
  return string[string.length - 1] === "\n" ? string.slice(0, -1) : string;
}
// Note: a long line without a suitable break point will exceed the width limit.
// Pre-conditions: every char in str isPrintable, str.length > 0, width > 0.
function foldString(string, width) {
  // In folded style, $k$ consecutive newlines output as $k+1$ newlines—
  // unless they're before or after a more-indented line, or at the very
  // beginning or end, in which case $k$ maps to $k$.
  // Therefore, parse each chunk as newline(s) followed by a content line.
  const lineRe = /(\n+)([^\n]*)/g;
  // first line (possibly an empty line)
  let result = (()=>{
    let nextLF = string.indexOf("\n");
    nextLF = nextLF !== -1 ? nextLF : string.length;
    lineRe.lastIndex = nextLF;
    return foldLine(string.slice(0, nextLF), width);
  })();
  // If we haven't reached the first content line yet, don't add an extra \n.
  let prevMoreIndented = string[0] === "\n" || string[0] === " ";
  let moreIndented;
  // rest of the lines
  let match;
  // tslint:disable-next-line:no-conditional-assignment
  while(match = lineRe.exec(string)){
    const prefix = match[1], line = match[2];
    moreIndented = line[0] === " ";
    result += prefix + (!prevMoreIndented && !moreIndented && line !== "" ? "\n" : "") + foldLine(line, width);
    prevMoreIndented = moreIndented;
  }
  return result;
}
// Escapes a double-quoted string.
function escapeString(string) {
  let result = "";
  let char, nextChar;
  let escapeSeq;
  for(let i = 0; i < string.length; i++){
    char = string.charCodeAt(i);
    // Check for surrogate pairs (reference Unicode 3.0 section "3.7 Surrogates").
    if (char >= 0xd800 && char <= 0xdbff /* high surrogate */ ) {
      nextChar = string.charCodeAt(i + 1);
      if (nextChar >= 0xdc00 && nextChar <= 0xdfff /* low surrogate */ ) {
        // Combine the surrogate pair and store it escaped.
        result += encodeHex((char - 0xd800) * 0x400 + nextChar - 0xdc00 + 0x10000);
        // Advance index one extra since we already used that char here.
        i++;
        continue;
      }
    }
    escapeSeq = ESCAPE_SEQUENCES[char];
    result += !escapeSeq && isPrintable(char) ? string[i] : escapeSeq || encodeHex(char);
  }
  return result;
}
// Pre-conditions: string is valid for a block scalar, 1 <= indentPerLevel <= 9.
function blockHeader(string, indentPerLevel) {
  const indentIndicator = needIndentIndicator(string) ? String(indentPerLevel) : "";
  // note the special case: the string '\n' counts as a "trailing" empty line.
  const clip = string[string.length - 1] === "\n";
  const keep = clip && (string[string.length - 2] === "\n" || string === "\n");
  const chomp = keep ? "+" : clip ? "" : "-";
  return `${indentIndicator}${chomp}\n`;
}
// Note: line breaking/folding is implemented for only the folded style.
// NB. We drop the last trailing newline (if any) of a returned block scalar
//  since the dumper adds its own newline. This always works:
//    • No ending newline => unaffected; already using strip "-" chomping.
//    • Ending newline    => removed then restored.
//  Importantly, this keeps the "+" chomp indicator from gaining an extra line.
function writeScalar(state, string, level, iskey) {
  state.dump = (()=>{
    if (string.length === 0) {
      return "''";
    }
    if (!state.noCompatMode && DEPRECATED_BOOLEANS_SYNTAX.indexOf(string) !== -1) {
      return `'${string}'`;
    }
    const indent = state.indent * Math.max(1, level); // no 0-indent scalars
    // As indentation gets deeper, let the width decrease monotonically
    // to the lower bound min(state.lineWidth, 40).
    // Note that this implies
    //  state.lineWidth ≤ 40 + state.indent: width is fixed at the lower bound.
    //  state.lineWidth > 40 + state.indent: width decreases until the lower
    //  bound.
    // This behaves better than a constant minimum width which disallows
    // narrower options, or an indent threshold which causes the width
    // to suddenly increase.
    const lineWidth = state.lineWidth === -1 ? -1 : Math.max(Math.min(state.lineWidth, 40), state.lineWidth - indent);
    // Without knowing if keys are implicit/explicit,
    // assume implicit for safety.
    const singleLineOnly = iskey || // No block styles in flow mode.
    state.flowLevel > -1 && level >= state.flowLevel;
    function testAmbiguity(str) {
      return testImplicitResolving(state, str);
    }
    switch(chooseScalarStyle(string, singleLineOnly, state.indent, lineWidth, testAmbiguity)){
      case STYLE_PLAIN:
        return string;
      case STYLE_SINGLE:
        return `'${string.replace(/'/g, "''")}'`;
      case STYLE_LITERAL:
        return `|${blockHeader(string, state.indent)}${dropEndingNewline(indentString(string, indent))}`;
      case STYLE_FOLDED:
        return `>${blockHeader(string, state.indent)}${dropEndingNewline(indentString(foldString(string, lineWidth), indent))}`;
      case STYLE_DOUBLE:
        return `"${escapeString(string)}"`;
      default:
        throw new YAMLError("impossible error: invalid scalar style");
    }
  })();
}
function writeFlowSequence(state, level, object) {
  let _result = "";
  const _tag = state.tag;
  for(let index = 0, length = object.length; index < length; index += 1){
    // Write only valid elements.
    if (writeNode(state, level, object[index], false, false)) {
      if (index !== 0) _result += `,${!state.condenseFlow ? " " : ""}`;
      _result += state.dump;
    }
  }
  state.tag = _tag;
  state.dump = `[${_result}]`;
}
function writeBlockSequence(state, level, object, compact = false) {
  let _result = "";
  const _tag = state.tag;
  for(let index = 0, length = object.length; index < length; index += 1){
    // Write only valid elements.
    if (writeNode(state, level + 1, object[index], true, true)) {
      if (!compact || index !== 0) {
        _result += generateNextLine(state, level);
      }
      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
        _result += "-";
      } else {
        _result += "- ";
      }
      _result += state.dump;
    }
  }
  state.tag = _tag;
  state.dump = _result || "[]"; // Empty sequence if no valid values.
}
function writeFlowMapping(state, level, object) {
  let _result = "";
  const _tag = state.tag, objectKeyList = Object.keys(object);
  let pairBuffer, objectKey, objectValue;
  for(let index = 0, length = objectKeyList.length; index < length; index += 1){
    pairBuffer = state.condenseFlow ? '"' : "";
    if (index !== 0) pairBuffer += ", ";
    objectKey = objectKeyList[index];
    objectValue = object[objectKey];
    if (!writeNode(state, level, objectKey, false, false)) {
      continue; // Skip this pair because of invalid key;
    }
    if (state.dump.length > 1024) pairBuffer += "? ";
    pairBuffer += `${state.dump}${state.condenseFlow ? '"' : ""}:${state.condenseFlow ? "" : " "}`;
    if (!writeNode(state, level, objectValue, false, false)) {
      continue; // Skip this pair because of invalid value.
    }
    pairBuffer += state.dump;
    // Both key and value are valid.
    _result += pairBuffer;
  }
  state.tag = _tag;
  state.dump = `{${_result}}`;
}
function writeBlockMapping(state, level, object, compact = false) {
  const _tag = state.tag, objectKeyList = Object.keys(object);
  let _result = "";
  // Allow sorting keys so that the output file is deterministic
  if (state.sortKeys === true) {
    // Default sorting
    objectKeyList.sort();
  } else if (typeof state.sortKeys === "function") {
    // Custom sort function
    objectKeyList.sort(state.sortKeys);
  } else if (state.sortKeys) {
    // Something is wrong
    throw new YAMLError("sortKeys must be a boolean or a function");
  }
  let pairBuffer = "", objectKey, objectValue, explicitPair;
  for(let index = 0, length = objectKeyList.length; index < length; index += 1){
    pairBuffer = "";
    if (!compact || index !== 0) {
      pairBuffer += generateNextLine(state, level);
    }
    objectKey = objectKeyList[index];
    objectValue = object[objectKey];
    if (!writeNode(state, level + 1, objectKey, true, true, true)) {
      continue; // Skip this pair because of invalid key.
    }
    explicitPair = state.tag !== null && state.tag !== "?" || state.dump && state.dump.length > 1024;
    if (explicitPair) {
      if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
        pairBuffer += "?";
      } else {
        pairBuffer += "? ";
      }
    }
    pairBuffer += state.dump;
    if (explicitPair) {
      pairBuffer += generateNextLine(state, level);
    }
    if (!writeNode(state, level + 1, objectValue, true, explicitPair)) {
      continue; // Skip this pair because of invalid value.
    }
    if (state.dump && CHAR_LINE_FEED === state.dump.charCodeAt(0)) {
      pairBuffer += ":";
    } else {
      pairBuffer += ": ";
    }
    pairBuffer += state.dump;
    // Both key and value are valid.
    _result += pairBuffer;
  }
  state.tag = _tag;
  state.dump = _result || "{}"; // Empty mapping if no valid pairs.
}
function detectType(state, object, explicit = false) {
  const typeList = explicit ? state.explicitTypes : state.implicitTypes;
  let type;
  let style;
  let _result;
  for(let index = 0, length = typeList.length; index < length; index += 1){
    type = typeList[index];
    if ((type.instanceOf || type.predicate) && (!type.instanceOf || typeof object === "object" && object instanceof type.instanceOf) && (!type.predicate || type.predicate(object))) {
      state.tag = explicit ? type.tag : "?";
      if (type.represent) {
        style = state.styleMap[type.tag] || type.defaultStyle;
        if (_toString.call(type.represent) === "[object Function]") {
          _result = type.represent(object, style);
        } else if (hasOwn(type.represent, style)) {
          _result = type.represent[style](object, style);
        } else {
          throw new YAMLError(`!<${type.tag}> tag resolver accepts not "${style}" style`);
        }
        state.dump = _result;
      }
      return true;
    }
  }
  return false;
}
// Serializes `object` and writes it to global `result`.
// Returns true on success, or false on invalid object.
//
function writeNode(state, level, object, block, compact, iskey = false) {
  state.tag = null;
  state.dump = object;
  if (!detectType(state, object, false)) {
    detectType(state, object, true);
  }
  const type = _toString.call(state.dump);
  if (block) {
    block = state.flowLevel < 0 || state.flowLevel > level;
  }
  const objectOrArray = type === "[object Object]" || type === "[object Array]";
  let duplicateIndex = -1;
  let duplicate = false;
  if (objectOrArray) {
    duplicateIndex = state.duplicates.indexOf(object);
    duplicate = duplicateIndex !== -1;
  }
  if (state.tag !== null && state.tag !== "?" || duplicate || state.indent !== 2 && level > 0) {
    compact = false;
  }
  if (duplicate && state.usedDuplicates[duplicateIndex]) {
    state.dump = `*ref_${duplicateIndex}`;
  } else {
    if (objectOrArray && duplicate && !state.usedDuplicates[duplicateIndex]) {
      state.usedDuplicates[duplicateIndex] = true;
    }
    if (type === "[object Object]") {
      if (block && Object.keys(state.dump).length !== 0) {
        writeBlockMapping(state, level, state.dump, compact);
        if (duplicate) {
          state.dump = `&ref_${duplicateIndex}${state.dump}`;
        }
      } else {
        writeFlowMapping(state, level, state.dump);
        if (duplicate) {
          state.dump = `&ref_${duplicateIndex} ${state.dump}`;
        }
      }
    } else if (type === "[object Array]") {
      const arrayLevel = state.noArrayIndent && level > 0 ? level - 1 : level;
      if (block && state.dump.length !== 0) {
        writeBlockSequence(state, arrayLevel, state.dump, compact);
        if (duplicate) {
          state.dump = `&ref_${duplicateIndex}${state.dump}`;
        }
      } else {
        writeFlowSequence(state, arrayLevel, state.dump);
        if (duplicate) {
          state.dump = `&ref_${duplicateIndex} ${state.dump}`;
        }
      }
    } else if (type === "[object String]") {
      if (state.tag !== "?") {
        writeScalar(state, state.dump, level, iskey);
      }
    } else {
      if (state.skipInvalid) return false;
      throw new YAMLError(`unacceptable kind of an object to dump ${type}`);
    }
    if (state.tag !== null && state.tag !== "?") {
      state.dump = `!<${state.tag}> ${state.dump}`;
    }
  }
  return true;
}
function inspectNode(object, objects, duplicatesIndexes) {
  if (object !== null && typeof object === "object") {
    const index = objects.indexOf(object);
    if (index !== -1) {
      if (duplicatesIndexes.indexOf(index) === -1) {
        duplicatesIndexes.push(index);
      }
    } else {
      objects.push(object);
      if (Array.isArray(object)) {
        for(let idx = 0, length = object.length; idx < length; idx += 1){
          inspectNode(object[idx], objects, duplicatesIndexes);
        }
      } else {
        const objectKeyList = Object.keys(object);
        for(let idx = 0, length = objectKeyList.length; idx < length; idx += 1){
          inspectNode(object[objectKeyList[idx]], objects, duplicatesIndexes);
        }
      }
    }
  }
}
function getDuplicateReferences(object, state) {
  const objects = [], duplicatesIndexes = [];
  inspectNode(object, objects, duplicatesIndexes);
  const length = duplicatesIndexes.length;
  for(let index = 0; index < length; index += 1){
    state.duplicates.push(objects[duplicatesIndexes[index]]);
  }
  state.usedDuplicates = Array.from({
    length
  });
}
export function dump(input, options) {
  options = options || {};
  const state = new DumperState(options);
  if (!state.noRefs) getDuplicateReferences(input, state);
  if (writeNode(state, 0, input, true, true)) return `${state.dump}\n`;
  return "";
}
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