Set up comprehensive frontend testing infrastructure

- Install Jest for unit testing with React Testing Library
- Install Playwright for end-to-end testing
- Configure Jest with proper TypeScript support and module mapping
- Create test setup files and utilities for both unit and e2e tests

Components:
* Jest configuration with coverage thresholds
* Playwright configuration with browser automation
* Unit tests for LoginForm, AuthContext, and useSocketIO hook
* E2E tests for authentication, dashboard, and agents workflows
* GitHub Actions workflow for automated testing
* Mock data and API utilities for consistent testing
* Test documentation with best practices

Testing features:
- Unit tests with 70% coverage threshold
- E2E tests with API mocking and user journey testing
- CI/CD integration for automated test runs
- Cross-browser testing support with Playwright
- Authentication system testing end-to-end

🚀 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/node_modules/tldts-core/src/domain-without-suffix.ts

@@ -0,0 +1,14 @@
+/**
+ * Return the part of domain without suffix.
+ *
+ * Example: for domain 'foo.com', the result would be 'foo'.
+ */
+export default function getDomainWithoutSuffix(
+  domain: string,
+  suffix: string,
+): string {
+  // Note: here `domain` and `suffix` cannot have the same length because in
+  // this case we set `domain` to `null` instead. It is thus safe to assume
+  // that `suffix` is shorter than `domain`.
+  return domain.slice(0, -suffix.length - 1);
+}

frontend/node_modules/tldts-core/src/domain.ts

@@ -0,0 +1,100 @@
+import { IOptions } from './options';
+
+/**
+ * Check if `vhost` is a valid suffix of `hostname` (top-domain)
+ *
+ * It means that `vhost` needs to be a suffix of `hostname` and we then need to
+ * make sure that: either they are equal, or the character preceding `vhost` in
+ * `hostname` is a '.' (it should not be a partial label).
+ *
+ * * hostname = 'not.evil.com' and vhost = 'vil.com'      => not ok
+ * * hostname = 'not.evil.com' and vhost = 'evil.com'     => ok
+ * * hostname = 'not.evil.com' and vhost = 'not.evil.com' => ok
+ */
+function shareSameDomainSuffix(hostname: string, vhost: string): boolean {
+  if (hostname.endsWith(vhost)) {
+    return (
+      hostname.length === vhost.length ||
+      hostname[hostname.length - vhost.length - 1] === '.'
+    );
+  }
+
+  return false;
+}
+
+/**
+ * Given a hostname and its public suffix, extract the general domain.
+ */
+function extractDomainWithSuffix(
+  hostname: string,
+  publicSuffix: string,
+): string {
+  // Locate the index of the last '.' in the part of the `hostname` preceding
+  // the public suffix.
+  //
+  // examples:
+  //   1. not.evil.co.uk  => evil.co.uk
+  //         ^    ^
+  //         |    | start of public suffix
+  //         | index of the last dot
+  //
+  //   2. example.co.uk   => example.co.uk
+  //     ^       ^
+  //     |       | start of public suffix
+  //     |
+  //     | (-1) no dot found before the public suffix
+  const publicSuffixIndex = hostname.length - publicSuffix.length - 2;
+  const lastDotBeforeSuffixIndex = hostname.lastIndexOf('.', publicSuffixIndex);
+
+  // No '.' found, then `hostname` is the general domain (no sub-domain)
+  if (lastDotBeforeSuffixIndex === -1) {
+    return hostname;
+  }
+
+  // Extract the part between the last '.'
+  return hostname.slice(lastDotBeforeSuffixIndex + 1);
+}
+
+/**
+ * Detects the domain based on rules and upon and a host string
+ */
+export default function getDomain(
+  suffix: string,
+  hostname: string,
+  options: IOptions,
+): string | null {
+  // Check if `hostname` ends with a member of `validHosts`.
+  if (options.validHosts !== null) {
+    const validHosts = options.validHosts;
+    for (const vhost of validHosts) {
+      if (/*@__INLINE__*/ shareSameDomainSuffix(hostname, vhost)) {
+        return vhost;
+      }
+    }
+  }
+
+  let numberOfLeadingDots = 0;
+  if (hostname.startsWith('.')) {
+    while (
+      numberOfLeadingDots < hostname.length &&
+      hostname[numberOfLeadingDots] === '.'
+    ) {
+      numberOfLeadingDots += 1;
+    }
+  }
+
+  // If `hostname` is a valid public suffix, then there is no domain to return.
+  // Since we already know that `getPublicSuffix` returns a suffix of `hostname`
+  // there is no need to perform a string comparison and we only compare the
+  // size.
+  if (suffix.length === hostname.length - numberOfLeadingDots) {
+    return null;
+  }
+
+  // To extract the general domain, we start by identifying the public suffix
+  // (if any), then consider the domain to be the public suffix with one added
+  // level of depth. (e.g.: if hostname is `not.evil.co.uk` and public suffix:
+  // `co.uk`, then we take one more level: `evil`, giving the final result:
+  // `evil.co.uk`).
+  return /*@__INLINE__*/ extractDomainWithSuffix(hostname, suffix);
+}

frontend/node_modules/tldts-core/src/extract-hostname.ts

@@ -0,0 +1,170 @@
+/**
+ * @param url - URL we want to extract a hostname from.
+ * @param urlIsValidHostname - hint from caller; true if `url` is already a valid hostname.
+ */
+export default function extractHostname(
+  url: string,
+  urlIsValidHostname: boolean,
+): string | null {
+  let start = 0;
+  let end: number = url.length;
+  let hasUpper = false;
+
+  // If url is not already a valid hostname, then try to extract hostname.
+  if (!urlIsValidHostname) {
+    // Special handling of data URLs
+    if (url.startsWith('data:')) {
+      return null;
+    }
+
+    // Trim leading spaces
+    while (start < url.length && url.charCodeAt(start) <= 32) {
+      start += 1;
+    }
+
+    // Trim trailing spaces
+    while (end > start + 1 && url.charCodeAt(end - 1) <= 32) {
+      end -= 1;
+    }
+
+    // Skip scheme.
+    if (
+      url.charCodeAt(start) === 47 /* '/' */ &&
+      url.charCodeAt(start + 1) === 47 /* '/' */
+    ) {
+      start += 2;
+    } else {
+      const indexOfProtocol = url.indexOf(':/', start);
+      if (indexOfProtocol !== -1) {
+        // Implement fast-path for common protocols. We expect most protocols
+        // should be one of these 4 and thus we will not need to perform the
+        // more expansive validity check most of the time.
+        const protocolSize = indexOfProtocol - start;
+        const c0 = url.charCodeAt(start);
+        const c1 = url.charCodeAt(start + 1);
+        const c2 = url.charCodeAt(start + 2);
+        const c3 = url.charCodeAt(start + 3);
+        const c4 = url.charCodeAt(start + 4);
+
+        if (
+          protocolSize === 5 &&
+          c0 === 104 /* 'h' */ &&
+          c1 === 116 /* 't' */ &&
+          c2 === 116 /* 't' */ &&
+          c3 === 112 /* 'p' */ &&
+          c4 === 115 /* 's' */
+        ) {
+          // https
+        } else if (
+          protocolSize === 4 &&
+          c0 === 104 /* 'h' */ &&
+          c1 === 116 /* 't' */ &&
+          c2 === 116 /* 't' */ &&
+          c3 === 112 /* 'p' */
+        ) {
+          // http
+        } else if (
+          protocolSize === 3 &&
+          c0 === 119 /* 'w' */ &&
+          c1 === 115 /* 's' */ &&
+          c2 === 115 /* 's' */
+        ) {
+          // wss
+        } else if (
+          protocolSize === 2 &&
+          c0 === 119 /* 'w' */ &&
+          c1 === 115 /* 's' */
+        ) {
+          // ws
+        } else {
+          // Check that scheme is valid
+          for (let i = start; i < indexOfProtocol; i += 1) {
+            const lowerCaseCode = url.charCodeAt(i) | 32;
+            if (
+              !(
+                (
+                  (lowerCaseCode >= 97 && lowerCaseCode <= 122) || // [a, z]
+                  (lowerCaseCode >= 48 && lowerCaseCode <= 57) || // [0, 9]
+                  lowerCaseCode === 46 || // '.'
+                  lowerCaseCode === 45 || // '-'
+                  lowerCaseCode === 43
+                ) // '+'
+              )
+            ) {
+              return null;
+            }
+          }
+        }
+
+        // Skip 0, 1 or more '/' after ':/'
+        start = indexOfProtocol + 2;
+        while (url.charCodeAt(start) === 47 /* '/' */) {
+          start += 1;
+        }
+      }
+    }
+
+    // Detect first occurrence of '/', '?' or '#'. We also keep track of the
+    // last occurrence of '@', ']' or ':' to speed-up subsequent parsing of
+    // (respectively), identifier, ipv6 or port.
+    let indexOfIdentifier = -1;
+    let indexOfClosingBracket = -1;
+    let indexOfPort = -1;
+    for (let i = start; i < end; i += 1) {
+      const code: number = url.charCodeAt(i);
+      if (
+        code === 35 || // '#'
+        code === 47 || // '/'
+        code === 63 // '?'
+      ) {
+        end = i;
+        break;
+      } else if (code === 64) {
+        // '@'
+        indexOfIdentifier = i;
+      } else if (code === 93) {
+        // ']'
+        indexOfClosingBracket = i;
+      } else if (code === 58) {
+        // ':'
+        indexOfPort = i;
+      } else if (code >= 65 && code <= 90) {
+        hasUpper = true;
+      }
+    }
+
+    // Detect identifier: '@'
+    if (
+      indexOfIdentifier !== -1 &&
+      indexOfIdentifier > start &&
+      indexOfIdentifier < end
+    ) {
+      start = indexOfIdentifier + 1;
+    }
+
+    // Handle ipv6 addresses
+    if (url.charCodeAt(start) === 91 /* '[' */) {
+      if (indexOfClosingBracket !== -1) {
+        return url.slice(start + 1, indexOfClosingBracket).toLowerCase();
+      }
+      return null;
+    } else if (indexOfPort !== -1 && indexOfPort > start && indexOfPort < end) {
+      // Detect port: ':'
+      end = indexOfPort;
+    }
+  }
+
+  // Trim trailing dots
+  while (end > start + 1 && url.charCodeAt(end - 1) === 46 /* '.' */) {
+    end -= 1;
+  }
+
+  const hostname: string =
+    start !== 0 || end !== url.length ? url.slice(start, end) : url;
+
+  if (hasUpper) {
+    return hostname.toLowerCase();
+  }
+
+  return hostname;
+}

frontend/node_modules/tldts-core/src/factory.ts

@@ -0,0 +1,160 @@
+/**
+ * Implement a factory allowing to plug different implementations of suffix
+ * lookup (e.g.: using a trie or the packed hashes datastructures). This is used
+ * and exposed in `tldts.ts` and `tldts-experimental.ts` bundle entrypoints.
+ */
+
+import getDomain from './domain';
+import getDomainWithoutSuffix from './domain-without-suffix';
+import extractHostname from './extract-hostname';
+import isIp from './is-ip';
+import isValidHostname from './is-valid';
+import { IPublicSuffix, ISuffixLookupOptions } from './lookup/interface';
+import { IOptions, setDefaults } from './options';
+import getSubdomain from './subdomain';
+
+export interface IResult {
+  // `hostname` is either a registered name (including but not limited to a
+  // hostname), or an IP address. IPv4 addresses must be in dot-decimal
+  // notation, and IPv6 addresses must be enclosed in brackets ([]). This is
+  // directly extracted from the input URL.
+  hostname: string | null;
+
+  // Is `hostname` an IP? (IPv4 or IPv6)
+  isIp: boolean | null;
+
+  // `hostname` split between subdomain, domain and its public suffix (if any)
+  subdomain: string | null;
+  domain: string | null;
+  publicSuffix: string | null;
+  domainWithoutSuffix: string | null;
+
+  // Specifies if `publicSuffix` comes from the ICANN or PRIVATE section of the list
+  isIcann: boolean | null;
+  isPrivate: boolean | null;
+}
+
+export function getEmptyResult(): IResult {
+  return {
+    domain: null,
+    domainWithoutSuffix: null,
+    hostname: null,
+    isIcann: null,
+    isIp: null,
+    isPrivate: null,
+    publicSuffix: null,
+    subdomain: null,
+  };
+}
+
+export function resetResult(result: IResult): void {
+  result.domain = null;
+  result.domainWithoutSuffix = null;
+  result.hostname = null;
+  result.isIcann = null;
+  result.isIp = null;
+  result.isPrivate = null;
+  result.publicSuffix = null;
+  result.subdomain = null;
+}
+
+// Flags representing steps in the `parse` function. They are used to implement
+// an early stop mechanism (simulating some form of laziness) to avoid doing
+// more work than necessary to perform a given action (e.g.: we don't need to
+// extract the domain and subdomain if we are only interested in public suffix).
+export const enum FLAG {
+  HOSTNAME,
+  IS_VALID,
+  PUBLIC_SUFFIX,
+  DOMAIN,
+  SUB_DOMAIN,
+  ALL,
+}
+
+export function parseImpl(
+  url: string,
+  step: FLAG,
+  suffixLookup: (
+    _1: string,
+    _2: ISuffixLookupOptions,
+    _3: IPublicSuffix,
+  ) => void,
+  partialOptions: Partial<IOptions>,
+  result: IResult,
+): IResult {
+  const options: IOptions = /*@__INLINE__*/ setDefaults(partialOptions);
+
+  // Very fast approximate check to make sure `url` is a string. This is needed
+  // because the library will not necessarily be used in a typed setup and
+  // values of arbitrary types might be given as argument.
+  if (typeof url !== 'string') {
+    return result;
+  }
+
+  // Extract hostname from `url` only if needed. This can be made optional
+  // using `options.extractHostname`. This option will typically be used
+  // whenever we are sure the inputs to `parse` are already hostnames and not
+  // arbitrary URLs.
+  //
+  // `mixedInput` allows to specify if we expect a mix of URLs and hostnames
+  // as input. If only hostnames are expected then `extractHostname` can be
+  // set to `false` to speed-up parsing. If only URLs are expected then
+  // `mixedInputs` can be set to `false`. The `mixedInputs` is only a hint
+  // and will not change the behavior of the library.
+  if (!options.extractHostname) {
+    result.hostname = url;
+  } else if (options.mixedInputs) {
+    result.hostname = extractHostname(url, isValidHostname(url));
+  } else {
+    result.hostname = extractHostname(url, false);
+  }
+
+  if (step === FLAG.HOSTNAME || result.hostname === null) {
+    return result;
+  }
+
+  // Check if `hostname` is a valid ip address
+  if (options.detectIp) {
+    result.isIp = isIp(result.hostname);
+    if (result.isIp) {
+      return result;
+    }
+  }
+
+  // Perform optional hostname validation. If hostname is not valid, no need to
+  // go further as there will be no valid domain or sub-domain.
+  if (
+    options.validateHostname &&
+    options.extractHostname &&
+    !isValidHostname(result.hostname)
+  ) {
+    result.hostname = null;
+    return result;
+  }
+
+  // Extract public suffix
+  suffixLookup(result.hostname, options, result);
+  if (step === FLAG.PUBLIC_SUFFIX || result.publicSuffix === null) {
+    return result;
+  }
+
+  // Extract domain
+  result.domain = getDomain(result.publicSuffix, result.hostname, options);
+  if (step === FLAG.DOMAIN || result.domain === null) {
+    return result;
+  }
+
+  // Extract subdomain
+  result.subdomain = getSubdomain(result.hostname, result.domain);
+  if (step === FLAG.SUB_DOMAIN) {
+    return result;
+  }
+
+  // Extract domain without suffix
+  result.domainWithoutSuffix = getDomainWithoutSuffix(
+    result.domain,
+    result.publicSuffix,
+  );
+
+  return result;
+}

frontend/node_modules/tldts-core/src/is-ip.ts

@@ -0,0 +1,87 @@
+/**
+ * Check if a hostname is an IP. You should be aware that this only works
+ * because `hostname` is already garanteed to be a valid hostname!
+ */
+function isProbablyIpv4(hostname: string): boolean {
+  // Cannot be shorted than 1.1.1.1
+  if (hostname.length < 7) {
+    return false;
+  }
+
+  // Cannot be longer than: 255.255.255.255
+  if (hostname.length > 15) {
+    return false;
+  }
+
+  let numberOfDots = 0;
+
+  for (let i = 0; i < hostname.length; i += 1) {
+    const code = hostname.charCodeAt(i);
+
+    if (code === 46 /* '.' */) {
+      numberOfDots += 1;
+    } else if (code < 48 /* '0' */ || code > 57 /* '9' */) {
+      return false;
+    }
+  }
+
+  return (
+    numberOfDots === 3 &&
+    hostname.charCodeAt(0) !== 46 /* '.' */ &&
+    hostname.charCodeAt(hostname.length - 1) !== 46 /* '.' */
+  );
+}
+
+/**
+ * Similar to isProbablyIpv4.
+ */
+function isProbablyIpv6(hostname: string): boolean {
+  if (hostname.length < 3) {
+    return false;
+  }
+
+  let start = hostname.startsWith('[') ? 1 : 0;
+  let end = hostname.length;
+
+  if (hostname[end - 1] === ']') {
+    end -= 1;
+  }
+
+  // We only consider the maximum size of a normal IPV6. Note that this will
+  // fail on so-called "IPv4 mapped IPv6 addresses" but this is a corner-case
+  // and a proper validation library should be used for these.
+  if (end - start > 39) {
+    return false;
+  }
+
+  let hasColon = false;
+
+  for (; start < end; start += 1) {
+    const code = hostname.charCodeAt(start);
+
+    if (code === 58 /* ':' */) {
+      hasColon = true;
+    } else if (
+      !(
+        (
+          (code >= 48 && code <= 57) || // 0-9
+          (code >= 97 && code <= 102) || // a-f
+          (code >= 65 && code <= 90)
+        ) // A-F
+      )
+    ) {
+      return false;
+    }
+  }
+
+  return hasColon;
+}
+
+/**
+ * Check if `hostname` is *probably* a valid ip addr (either ipv6 or ipv4).
+ * This *will not* work on any string. We need `hostname` to be a valid
+ * hostname.
+ */
+export default function isIp(hostname: string): boolean {
+  return isProbablyIpv6(hostname) || isProbablyIpv4(hostname);
+}

frontend/node_modules/tldts-core/src/is-valid.ts

@@ -0,0 +1,79 @@
+/**
+ * Implements fast shallow verification of hostnames. This does not perform a
+ * struct check on the content of labels (classes of Unicode characters, etc.)
+ * but instead check that the structure is valid (number of labels, length of
+ * labels, etc.).
+ *
+ * If you need stricter validation, consider using an external library.
+ */
+
+function isValidAscii(code: number): boolean {
+  return (
+    (code >= 97 && code <= 122) || (code >= 48 && code <= 57) || code > 127
+  );
+}
+
+/**
+ * Check if a hostname string is valid. It's usually a preliminary check before
+ * trying to use getDomain or anything else.
+ *
+ * Beware: it does not check if the TLD exists.
+ */
+export default function (hostname: string): boolean {
+  if (hostname.length > 255) {
+    return false;
+  }
+
+  if (hostname.length === 0) {
+    return false;
+  }
+
+  if (
+    /*@__INLINE__*/ !isValidAscii(hostname.charCodeAt(0)) &&
+    hostname.charCodeAt(0) !== 46 && // '.' (dot)
+    hostname.charCodeAt(0) !== 95 // '_' (underscore)
+  ) {
+    return false;
+  }
+
+  // Validate hostname according to RFC
+  let lastDotIndex = -1;
+  let lastCharCode = -1;
+  const len = hostname.length;
+
+  for (let i = 0; i < len; i += 1) {
+    const code = hostname.charCodeAt(i);
+    if (code === 46 /* '.' */) {
+      if (
+        // Check that previous label is < 63 bytes long (64 = 63 + '.')
+        i - lastDotIndex > 64 ||
+        // Check that previous character was not already a '.'
+        lastCharCode === 46 ||
+        // Check that the previous label does not end with a '-' (dash)
+        lastCharCode === 45 ||
+        // Check that the previous label does not end with a '_' (underscore)
+        lastCharCode === 95
+      ) {
+        return false;
+      }
+
+      lastDotIndex = i;
+    } else if (
+      !(/*@__INLINE__*/ (isValidAscii(code) || code === 45 || code === 95))
+    ) {
+      // Check if there is a forbidden character in the label
+      return false;
+    }
+
+    lastCharCode = code;
+  }
+
+  return (
+    // Check that last label is shorter than 63 chars
+    len - lastDotIndex - 1 <= 63 &&
+    // Check that the last character is an allowed trailing label character.
+    // Since we already checked that the char is a valid hostname character,
+    // we only need to check that it's different from '-'.
+    lastCharCode !== 45
+  );
+}

frontend/node_modules/tldts-core/src/lookup/fast-path.ts

@@ -0,0 +1,80 @@
+import { IPublicSuffix, ISuffixLookupOptions } from './interface';
+
+export default function (
+  hostname: string,
+  options: ISuffixLookupOptions,
+  out: IPublicSuffix,
+): boolean {
+  // Fast path for very popular suffixes; this allows to by-pass lookup
+  // completely as well as any extra allocation or string manipulation.
+  if (!options.allowPrivateDomains && hostname.length > 3) {
+    const last: number = hostname.length - 1;
+    const c3: number = hostname.charCodeAt(last);
+    const c2: number = hostname.charCodeAt(last - 1);
+    const c1: number = hostname.charCodeAt(last - 2);
+    const c0: number = hostname.charCodeAt(last - 3);
+
+    if (
+      c3 === 109 /* 'm' */ &&
+      c2 === 111 /* 'o' */ &&
+      c1 === 99 /* 'c' */ &&
+      c0 === 46 /* '.' */
+    ) {
+      out.isIcann = true;
+      out.isPrivate = false;
+      out.publicSuffix = 'com';
+      return true;
+    } else if (
+      c3 === 103 /* 'g' */ &&
+      c2 === 114 /* 'r' */ &&
+      c1 === 111 /* 'o' */ &&
+      c0 === 46 /* '.' */
+    ) {
+      out.isIcann = true;
+      out.isPrivate = false;
+      out.publicSuffix = 'org';
+      return true;
+    } else if (
+      c3 === 117 /* 'u' */ &&
+      c2 === 100 /* 'd' */ &&
+      c1 === 101 /* 'e' */ &&
+      c0 === 46 /* '.' */
+    ) {
+      out.isIcann = true;
+      out.isPrivate = false;
+      out.publicSuffix = 'edu';
+      return true;
+    } else if (
+      c3 === 118 /* 'v' */ &&
+      c2 === 111 /* 'o' */ &&
+      c1 === 103 /* 'g' */ &&
+      c0 === 46 /* '.' */
+    ) {
+      out.isIcann = true;
+      out.isPrivate = false;
+      out.publicSuffix = 'gov';
+      return true;
+    } else if (
+      c3 === 116 /* 't' */ &&
+      c2 === 101 /* 'e' */ &&
+      c1 === 110 /* 'n' */ &&
+      c0 === 46 /* '.' */
+    ) {
+      out.isIcann = true;
+      out.isPrivate = false;
+      out.publicSuffix = 'net';
+      return true;
+    } else if (
+      c3 === 101 /* 'e' */ &&
+      c2 === 100 /* 'd' */ &&
+      c1 === 46 /* '.' */
+    ) {
+      out.isIcann = true;
+      out.isPrivate = false;
+      out.publicSuffix = 'de';
+      return true;
+    }
+  }
+
+  return false;
+}

frontend/node_modules/tldts-core/src/lookup/interface.ts

@@ -0,0 +1,10 @@
+export interface IPublicSuffix {
+  isIcann: boolean | null;
+  isPrivate: boolean | null;
+  publicSuffix: string | null;
+}
+
+export interface ISuffixLookupOptions {
+  allowIcannDomains: boolean;
+  allowPrivateDomains: boolean;
+}

frontend/node_modules/tldts-core/src/options.ts

@@ -0,0 +1,39 @@
+export interface IOptions {
+  allowIcannDomains: boolean;
+  allowPrivateDomains: boolean;
+  detectIp: boolean;
+  extractHostname: boolean;
+  mixedInputs: boolean;
+  validHosts: string[] | null;
+  validateHostname: boolean;
+}
+
+function setDefaultsImpl({
+  allowIcannDomains = true,
+  allowPrivateDomains = false,
+  detectIp = true,
+  extractHostname = true,
+  mixedInputs = true,
+  validHosts = null,
+  validateHostname = true,
+}: Partial<IOptions>): IOptions {
+  return {
+    allowIcannDomains,
+    allowPrivateDomains,
+    detectIp,
+    extractHostname,
+    mixedInputs,
+    validHosts,
+    validateHostname,
+  };
+}
+
+const DEFAULT_OPTIONS = /*@__INLINE__*/ setDefaultsImpl({});
+
+export function setDefaults(options?: Partial<IOptions>): IOptions {
+  if (options === undefined) {
+    return DEFAULT_OPTIONS;
+  }
+
+  return /*@__INLINE__*/ setDefaultsImpl(options);
+}

frontend/node_modules/tldts-core/src/subdomain.ts

@@ -0,0 +1,11 @@
+/**
+ * Returns the subdomain of a hostname string
+ */
+export default function getSubdomain(hostname: string, domain: string): string {
+  // If `hostname` and `domain` are the same, then there is no sub-domain
+  if (domain.length === hostname.length) {
+    return '';
+  }
+
+  return hostname.slice(0, -domain.length - 1);
+}