Support for React Native

Implementation for the fallback inspect function so that it produces equivalent output to the original inspect behavior.

lib/cookie.js

@@ -31,14 +31,14 @@
 "use strict";
 const punycode = require("punycode");
 const urlParse = require("url-parse");
-const nodeUtil = require("./nodeUtil");
 const pubsuffix = require("./pubsuffix-psl");
 const Store = require("./store").Store;
 const MemoryCookieStore = require("./memstore").MemoryCookieStore;
 const pathMatch = require("./pathMatch").pathMatch;
 const validators = require("./validators.js");
 const VERSION = require("./version");
 const { fromCallback } = require("universalify");
+const { getCustomInspectSymbol } = require("./utilHelper");
 
 // From RFC6265 S4.1.1
 // note that it excludes \x3B ";"
@@ -812,9 +812,9 @@ const cookieDefaults = {
 
 class Cookie {
   constructor(options = {}) {
-    const util = nodeUtil();
-    if (util.inspect.custom) {
-      this[util.inspect.custom] = this.inspect;
+    const customInspectSymbol = getCustomInspectSymbol();
+    if (customInspectSymbol) {
+      this[customInspectSymbol] = this.inspect;
     }
 
     Object.assign(this, cookieDefaults, options);

lib/memstore.js

@@ -33,21 +33,21 @@ const { fromCallback } = require("universalify");
 const Store = require("./store").Store;
 const permuteDomain = require("./permuteDomain").permuteDomain;
 const pathMatch = require("./pathMatch").pathMatch;
-const nodeUtil = require("./nodeUtil");
+const { getCustomInspectSymbol, getUtilInspect } = require("./utilHelper");
 
 class MemoryCookieStore extends Store {
   constructor() {
     super();
     this.synchronous = true;
     this.idx = {};
-    const util = nodeUtil();
-    if (util.inspect.custom) {
-      this[util.inspect.custom] = this.inspect;
+    const customInspectSymbol = getCustomInspectSymbol();
+    if (customInspectSymbol) {
+      this[customInspectSymbol] = this.inspect;
     }
   }
 
   inspect() {
-    const util = nodeUtil();
+    const util = { inspect: getUtilInspect(inspectFallback) };
     return `{ idx: ${util.inspect(this.idx, false, 2)} }`;
   }
 
@@ -190,3 +190,51 @@ class MemoryCookieStore extends Store {
 });
 
 exports.MemoryCookieStore = MemoryCookieStore;
+
+function inspectFallback(val) {
+  const domains = Object.keys(val);
+  if (domains.length === 0) {
+    return "{}";
+  }
+  let result = "{\n";
+  Object.keys(val).forEach((domain, i) => {
+    result += formatDomain(domain, val[domain]);
+    if (i < domains.length - 1) {
+      result += ",";
+    }
+    result += "\n";
+  });
+  result += "}";
+  return result;
+}
+
+function formatDomain(domainName, domainValue) {
+  const indent = "  ";
+  let result = `${indent}'${domainName}': {\n`;
+  Object.keys(domainValue).forEach((path, i, paths) => {
+    result += formatPath(path, domainValue[path]);
+    if (i < paths.length - 1) {
+      result += ",";
+    }
+    result += "\n";
+  });
+  result += `${indent}}`;
+  return result;
+}
+
+function formatPath(pathName, pathValue) {
+  const indent = "    ";
+  let result = `${indent}'${pathName}': {\n`;
+  Object.keys(pathValue).forEach((cookieName, i, cookieNames) => {
+    const cookie = pathValue[cookieName];
+    result += `      ${cookieName}: ${cookie.inspect()}`;
+    if (i < cookieNames.length - 1) {
+      result += ",";
+    }
+    result += "\n";
+  });
+  result += `${indent}}`;
+  return result;
+}
+
+exports.inspectFallback = inspectFallback;

lib/utilHelper.js

@@ -0,0 +1,39 @@
+function requireUtil() {
+  try {
+    // eslint-disable-next-line no-restricted-modules
+    return require("util");
+  } catch (e) {
+    return null;
+  }
+}
+
+// for v10.12.0+
+function lookupCustomInspectSymbol() {
+  return Symbol.for("nodejs.util.inspect.custom");
+}
+
+// for older node environments
+function tryReadingCustomSymbolFromUtilInspect(options) {
+  const _requireUtil = options.requireUtil || requireUtil;
+  const util = _requireUtil();
+  return util ? util.inspect.custom : null;
+}
+
+exports.getUtilInspect = function getUtilInspect(fallback, options = {}) {
+  const _requireUtil = options.requireUtil || requireUtil;
+  const util = _requireUtil();
+  return function inspect(value, showHidden, depth) {
+    return util ? util.inspect(value, showHidden, depth) : fallback(value);
+  };
+};
+
+exports.getCustomInspectSymbol = function getCustomInspectSymbol(options = {}) {
+  const _lookupCustomInspectSymbol =
+    options.lookupCustomInspectSymbol || lookupCustomInspectSymbol;
+
+  // get custom inspect symbol for node environments
+  return (
+    _lookupCustomInspectSymbol() ||
+    tryReadingCustomSymbolFromUtilInspect(options)
+  );
+};