import * as Hash from "./Hash.js";
import { hasProperty } from "./Predicate.js";
import { structuralRegionState } from "./Utils.js";
/**
 * @since 2.0.0
 * @category symbols
 */
export const symbol = /*#__PURE__*/Symbol.for("effect/Equal");
export function equals() {
  if (arguments.length === 1) {
    return self => compareBoth(self, arguments[0]);
  }
  return compareBoth(arguments[0], arguments[1]);
}
function compareBoth(self, that) {
  if (self === that) {
    return true;
  }
  const selfType = typeof self;
  if (selfType !== typeof that) {
    return false;
  }
  if (selfType === "object" || selfType === "function") {
    if (self !== null && that !== null) {
      if (isEqual(self) && isEqual(that)) {
        if (Hash.hash(self) === Hash.hash(that) && self[symbol](that)) {
          return true;
        } else {
          return structuralRegionState.enabled && structuralRegionState.tester ? structuralRegionState.tester(self, that) : false;
        }
      } else if (self instanceof Date && that instanceof Date) {
        const t1 = self.getTime();
        const t2 = that.getTime();
        return t1 === t2 || Number.isNaN(t1) && Number.isNaN(t2);
      } else if (self instanceof URL && that instanceof URL) {
        return self.href === that.href;
      }
    }
    if (structuralRegionState.enabled) {
      if (Array.isArray(self) && Array.isArray(that)) {
        return self.length === that.length && self.every((v, i) => compareBoth(v, that[i]));
      }
      if (Object.getPrototypeOf(self) === Object.prototype && Object.getPrototypeOf(that) === Object.prototype) {
        const keysSelf = Object.keys(self);
        const keysThat = Object.keys(that);
        if (keysSelf.length === keysThat.length) {
          for (const key of keysSelf) {
            // @ts-expect-error
            if (!(key in that && compareBoth(self[key], that[key]))) {
              return structuralRegionState.tester ? structuralRegionState.tester(self, that) : false;
            }
          }
          return true;
        }
      }
      return structuralRegionState.tester ? structuralRegionState.tester(self, that) : false;
    }
  }
  return structuralRegionState.enabled && structuralRegionState.tester ? structuralRegionState.tester(self, that) : false;
}
/**
 * @since 2.0.0
 * @category guards
 */
export const isEqual = u => hasProperty(u, symbol);
/**
 * @since 2.0.0
 * @category instances
 */
export const equivalence = () => equals;
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