Method stringifyNode

yaml/_dumper_state.ts:748–816

(value: unknown, { level, block, compact, isKey }: {
    level: number;
    block: boolean;
    compact: boolean;
    isKey: boolean;
  })

  // Serializes `object` and writes it to global `result`.
  // Returns true on success, or false on invalid object.
  stringifyNode(value: unknown, { level, block, compact, isKey }: {
    level: number;
    block: boolean;
    compact: boolean;
    isKey: boolean;
  }): string | null {
    const result = this.detectType(value);
    const tag = result.tag;
    value = result.value;

    if (block) {
      block = this.flowLevel < 0 || this.flowLevel > level;
    }

    if (typeof value === "string" || value instanceof String) {
      value = value instanceof String ? value.valueOf() : value;
      if (tag !== "?") {
        value = this.stringifyScalar(value as string, { level, isKey });
      }
      return stringifyValue(value, tag);
    }

    if (isObject(value)) {
      const duplicateIndex = this.duplicates.indexOf(value);
      const duplicate = duplicateIndex !== -1;

      if (duplicate) {
        if (this.usedDuplicates.has(value)) return `*ref_${duplicateIndex}`;
        this.usedDuplicates.add(value);
      }

      if (
        (tag !== null && tag !== "?") ||
        duplicate ||
        (this.indent !== 2 && level > 0)
      ) {
        compact = false;
      }

      if (Array.isArray(value)) {
        const arrayLevel = !this.arrayIndent && level > 0 ? level - 1 : level;
        if (block && value.length !== 0) {
          value = this.stringifyBlockSequence(value, {
            level: arrayLevel,
            compact,
          });
          if (duplicate) value = `&ref_${duplicateIndex}${value}`;
          return stringifyValue(value, tag);
        }

        value = this.stringifyFlowSequence(value, { level: arrayLevel });
        if (duplicate) value = `&ref_${duplicateIndex} ${value}`;
        return stringifyValue(value, tag);
      }

      if (block && Object.keys(value).length !== 0) {
        value = this.stringifyBlockMapping(value, { tag, level, compact });
        if (duplicate) value = `&ref_${duplicateIndex}${value}`;