diff --git a/lib/core/config-defaults.ts b/lib/core/config-defaults.ts
new file mode 100644
index 0000000..15a8934
--- /dev/null
+++ b/lib/core/config-defaults.ts
@@ -0,0 +1,33 @@
+import { parseQuery, stringifyQuery } from '@/core/serializer/query-serializer'
+import { deepClone } from '@/shared/helpers/deep-clone'
+import { parseUrl } from './serializer/url-serializer'
+
+export function normalizeConfig(config?: FluentUrlConfig): FluentUrlConfig {
+  return {
+    parseQuery: config?.parseQuery ?? parseQuery,
+    stringifyQuery: config?.stringifyQuery ?? stringifyQuery,
+  }
+}
+
+export function normalizeOptions(args: {
+  urlOptions?: Partial<FLuentUrlPlainObject> | string
+  parseQuery: QuerySerializer['parseQuery']
+}): FLuentUrlPlainObject {
+  const { urlOptions: urlOrOptions, parseQuery } = args
+
+  if (typeof urlOrOptions === 'string') {
+    return parseUrl({
+      str: urlOrOptions,
+      parseQuery: parseQuery,
+    })
+  }
+
+  return {
+    protocol: urlOrOptions?.protocol,
+    hostname: urlOrOptions?.hostname,
+    paths: deepClone(urlOrOptions?.paths) ?? [],
+    port: urlOrOptions?.port,
+    fragment: urlOrOptions?.fragment,
+    queries: deepClone(urlOrOptions?.queries) ?? Object.create(null),
+  }
+}
diff --git a/lib/core/fluent-url.ts b/lib/core/fluent-url.ts
new file mode 100644
index 0000000..8244500
--- /dev/null
+++ b/lib/core/fluent-url.ts
@@ -0,0 +1,86 @@
+import { normalizeConfig, normalizeOptions } from '@/core/config-defaults'
+import { deepClone } from '@/shared/helpers/deep-clone'
+import { stringifyUrl } from './serializer/url-serializer'
+
+export class FluentUrl {
+  private config: FluentUrlConfig
+  private readonly protocol?: string
+  private readonly hostname?: string
+  private readonly paths: string[]
+  private readonly port?: number
+  private readonly fragment?: string
+  private readonly queries: QueriesPlainObject
+
+  constructor(
+    urlOrOptions?: Partial<FLuentUrlPlainObject> | string,
+    config?: FluentUrlConfig,
+  ) {
+    this.config = normalizeConfig(config)
+
+    const { protocol, hostname, paths, port, fragment, queries } =
+      normalizeOptions({
+        urlOptions: urlOrOptions,
+        parseQuery: this.config.parseQuery,
+      })
+
+    this.protocol = protocol
+    this.hostname = hostname
+    this.paths = paths
+    this.port = port
+    this.fragment = fragment
+    this.queries = queries
+  }
+
+  public toString(): string {
+    return stringifyUrl({
+      obj: {
+        protocol: this.protocol,
+        hostname: this.hostname,
+        paths: this.paths,
+        port: this.port,
+        fragment: this.fragment,
+        queries: this.queries,
+      },
+      stringifyQuery: this.config.stringifyQuery,
+    })
+  }
+
+  public toJSON(): string {
+    return this.toString()
+  }
+
+  public valueOf(): string {
+    return this.toString()
+  }
+
+  public toPlainObject(): FLuentUrlPlainObject {
+    return deepClone({
+      protocol: this.protocol,
+      hostname: this.hostname,
+      paths: this.paths,
+      port: this.port,
+      fragment: this.fragment,
+      queries: this.queries,
+    })
+  }
+
+  public clone(
+    options?: Partial<FLuentUrlPlainObject>,
+    config?: FluentUrlConfig,
+  ): FluentUrl {
+    return new FluentUrl(
+      {
+        protocol: options?.protocol ?? this.protocol,
+        hostname: options?.hostname ?? this.hostname,
+        paths: options?.paths ?? this.paths,
+        port: options?.port ?? this.port,
+        fragment: options?.fragment ?? this.fragment,
+        queries: options?.queries ?? this.queries,
+      },
+      {
+        parseQuery: config?.parseQuery ?? this.config.parseQuery,
+        stringifyQuery: config?.stringifyQuery ?? this.config.stringifyQuery,
+      },
+    )
+  }
+}
diff --git a/lib/core/serializer/query-serializer.ts b/lib/core/serializer/query-serializer.ts
new file mode 100644
index 0000000..8386f03
--- /dev/null
+++ b/lib/core/serializer/query-serializer.ts
@@ -0,0 +1,7 @@
+export const parseQuery: QuerySerializer['parseQuery'] = () => {
+  throw new Error('Not implemented')
+}
+
+export const stringifyQuery: QuerySerializer['stringifyQuery'] = () => {
+  throw new Error('Not implemented')
+}
diff --git a/lib/core/serializer/url-serializer.ts b/lib/core/serializer/url-serializer.ts
new file mode 100644
index 0000000..ea0976c
--- /dev/null
+++ b/lib/core/serializer/url-serializer.ts
@@ -0,0 +1,7 @@
+export const parseUrl: UrlSerializer['parseUrl'] = () => {
+  throw new Error('Not implemented')
+}
+
+export const stringifyUrl: UrlSerializer['stringifyUrl'] = () => {
+  throw new Error('Not implemented')
+}
diff --git a/lib/index.ts b/lib/index.ts
new file mode 100644
index 0000000..96bd09a
--- /dev/null
+++ b/lib/index.ts
@@ -0,0 +1,3 @@
+import { FluentUrl } from '@/core/fluent-url'
+
+export { FluentUrl }
diff --git a/lib/shared/types/index.d.ts b/lib/shared/types/index.d.ts
new file mode 100644
index 0000000..874dc5f
--- /dev/null
+++ b/lib/shared/types/index.d.ts
@@ -0,0 +1,33 @@
+/** biome-ignore-all lint/correctness/noUnusedVariables: <> */
+
+type QueriesPlainObject = Record<string, any>
+
+interface FLuentUrlPlainObject {
+  protocol?: string
+  hostname?: string
+  paths: string[]
+  port?: number
+  fragment?: string
+  queries: QueriesPlainObject
+}
+
+interface QuerySerializer {
+  parseQuery: (str: string) => QueriesPlainObject
+  stringifyQuery: (obj: QueriesPlainObject) => string
+}
+
+interface UrlSerializer {
+  parseUrl: (args: {
+    str: string
+    parseQuery?: QuerySerializer['parseQuery']
+  }) => FLuentUrlPlainObject
+  stringifyUrl: (args: {
+    obj: FLuentUrlPlainObject
+    stringifyQuery?: QuerySerializer['stringifyQuery']
+  }) => string
+}
+
+interface FluentUrlConfig {
+  parseQuery: Serializer['parseQuery']
+  stringifyQuery: Serializer['stringifyQuery']
+}