diff --git a/Cargo.lock b/Cargo.lock
index 0a8690882dea7..84bd3596defba 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -958,6 +958,12 @@ dependencies = [
  "winapi-util",
 ]
 
+[[package]]
+name = "index_vec"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44faf5bb8861a9c72e20d3fb0fdbd59233e43056e2b80475ab0aacdc2e781355"
+
 [[package]]
 name = "indexmap"
 version = "2.6.0"
@@ -1011,7 +1017,7 @@ dependencies = [
  "handlebars",
  "lazy_static",
  "oxc_tasks_common",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
 ]
 
@@ -1078,7 +1084,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4979f22fdb869068da03c9f7528f8297c6fd2606bc3a4affe42e6a823fdb8da4"
 dependencies = [
  "cfg-if",
- "windows-targets 0.48.5",
+ "windows-targets 0.52.6",
 ]
 
 [[package]]
@@ -1406,11 +1412,11 @@ dependencies = [
  "oxc_parser",
  "oxc_regular_expression",
  "oxc_semantic",
- "oxc_sourcemap",
+ "oxc_sourcemap 0.38.0",
  "oxc_span",
  "oxc_syntax",
  "oxc_transformer",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -1421,7 +1427,7 @@ checksum = "d240f6572a29895f324ad834a42a0c4bad0739269a08d0181ad7d6db7537e0d1"
 dependencies = [
  "js-sys",
  "nom",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "serde-wasm-bindgen",
  "serde_json",
@@ -1505,7 +1511,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "regex",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
  "syn",
@@ -1524,7 +1530,7 @@ dependencies = [
  "oxc_parser",
  "oxc_prettier",
  "oxc_semantic",
- "oxc_sourcemap",
+ "oxc_sourcemap 0.38.0",
  "oxc_span",
  "oxc_tasks_common",
  "oxc_transformer",
@@ -1542,7 +1548,7 @@ dependencies = [
  "oxc_index",
  "oxc_syntax",
  "petgraph",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -1560,11 +1566,11 @@ dependencies = [
  "oxc_index",
  "oxc_mangler",
  "oxc_parser",
- "oxc_sourcemap",
+ "oxc_sourcemap 0.38.0",
  "oxc_span",
  "oxc_syntax",
  "pico-args",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -1597,7 +1603,7 @@ dependencies = [
  "pico-args",
  "rayon",
  "regex",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "saphyr",
  "serde",
  "serde_json",
@@ -1618,7 +1624,7 @@ name = "oxc_diagnostics"
 version = "0.38.0"
 dependencies = [
  "oxc-miette",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -1664,7 +1670,7 @@ dependencies = [
  "oxc_parser",
  "oxc_span",
  "oxc_syntax",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -1685,7 +1691,7 @@ dependencies = [
  "oxc_semantic",
  "oxc_span",
  "ropey",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
  "tokio",
@@ -1731,7 +1737,7 @@ dependencies = [
  "rayon",
  "regex",
  "rust-lapper",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "schemars",
  "serde",
  "serde_json",
@@ -1806,7 +1812,7 @@ dependencies = [
  "oxc_parser",
  "oxc_span",
  "oxc_tasks_common",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -1837,7 +1843,7 @@ dependencies = [
  "oxc_span",
  "oxc_syntax",
  "pico-args",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "seq-macro",
  "serde_json",
 ]
@@ -1851,7 +1857,9 @@ dependencies = [
  "napi-derive",
  "oxc",
  "oxc_module_lexer",
+ "self_cell",
  "serde_json",
+ "string_wizard",
 ]
 
 [[package]]
@@ -1877,7 +1885,7 @@ dependencies = [
  "oxc_span",
  "oxc_syntax",
  "pico-args",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -1891,7 +1899,7 @@ dependencies = [
  "oxc_span",
  "oxc_tasks_common",
  "pico-args",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "walkdir",
 ]
 
@@ -1905,7 +1913,7 @@ dependencies = [
  "oxc_estree",
  "oxc_span",
  "phf",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "unicode-id-start",
 ]
@@ -1921,7 +1929,7 @@ dependencies = [
  "indexmap",
  "json-strip-comments",
  "once_cell",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
  "simdutf8",
@@ -1947,13 +1955,26 @@ dependencies = [
  "oxc_span",
  "oxc_syntax",
  "phf",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
  "tsify",
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "oxc_sourcemap"
+version = "0.25.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1dd8e81ebe12ff1c13de9e44cc3d0d187de138cd23e9992959653ecd003d0261"
+dependencies = [
+ "base64-simd",
+ "cfg-if",
+ "rustc-hash 2.0.0",
+ "serde",
+ "serde_json",
+]
+
 [[package]]
 name = "oxc_sourcemap"
 version = "0.38.0"
@@ -1963,7 +1984,7 @@ dependencies = [
  "cow-utils",
  "insta",
  "rayon",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
 ]
@@ -1995,7 +2016,7 @@ dependencies = [
  "oxc_index",
  "oxc_span",
  "phf",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "ryu-js",
  "serde",
  "unicode-id-start",
@@ -2024,7 +2045,7 @@ dependencies = [
  "oxc_semantic",
  "oxc_span",
  "oxc_syntax",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -2077,7 +2098,7 @@ dependencies = [
  "oxc_traverse",
  "pico-args",
  "ropey",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "serde_json",
  "sha1",
@@ -2097,7 +2118,7 @@ dependencies = [
  "oxc_semantic",
  "oxc_span",
  "oxc_syntax",
- "rustc-hash",
+ "rustc-hash 2.0.0",
 ]
 
 [[package]]
@@ -2448,7 +2469,7 @@ dependencies = [
  "oxc_span",
  "oxc_tasks_common",
  "regex",
- "rustc-hash",
+ "rustc-hash 2.0.0",
  "serde",
  "ureq",
 ]
@@ -2468,6 +2489,12 @@ version = "0.1.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "719b953e2095829ee67db738b3bfa9fa368c94900df327b3f07fe6e794d2fe1f"
 
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "rustc-hash"
 version = "2.0.0"
@@ -2599,6 +2626,12 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "94143f37725109f92c262ed2cf5e59bce7498c01bcc1502d7b9afe439a4e9f49"
 
+[[package]]
+name = "self_cell"
+version = "1.0.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d369a96f978623eb3dc28807c4852d6cc617fed53da5d3c400feff1ef34a714a"
+
 [[package]]
 name = "semver"
 version = "1.0.23"
@@ -2807,6 +2840,17 @@ version = "0.4.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e9557cb6521e8d009c51a8666f09356f4b817ba9ba0981a305bd86aee47bd35c"
 
+[[package]]
+name = "string_wizard"
+version = "0.0.22"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6dda97f92b3c192214daba2a9d2e6c046edec247901234636159f2169ee7150a"
+dependencies = [
+ "index_vec",
+ "oxc_sourcemap 0.25.0",
+ "rustc-hash 1.1.0",
+]
+
 [[package]]
 name = "subtle"
 version = "2.6.1"
@@ -3373,7 +3417,7 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
 dependencies = [
- "windows-sys 0.48.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
diff --git a/napi/parser/Cargo.toml b/napi/parser/Cargo.toml
index c524b64ea580f..3cc027c38b635 100644
--- a/napi/parser/Cargo.toml
+++ b/napi/parser/Cargo.toml
@@ -26,7 +26,9 @@ oxc_module_lexer = { workspace = true }
 
 napi = { workspace = true, features = ["async"] }
 napi-derive = { workspace = true }
+self_cell = "1.0.4"
 serde_json = { workspace = true }
+string_wizard = { version = "0.0.22", features = ["source_map"] }
 
 [package.metadata.cargo-shear]
 ignored = ["napi"]
diff --git a/napi/parser/bindings.js b/napi/parser/bindings.js
index 2b09b39f8c35a..b95ccde1f62e2 100644
--- a/napi/parser/bindings.js
+++ b/napi/parser/bindings.js
@@ -361,6 +361,7 @@ if (!nativeBinding) {
   throw new Error(`Failed to load native binding`)
 }
 
+module.exports.ParserBuilder = nativeBinding.ParserBuilder
 module.exports.moduleLexerAsync = nativeBinding.moduleLexerAsync
 module.exports.moduleLexerSync = nativeBinding.moduleLexerSync
 module.exports.parseAsync = nativeBinding.parseAsync
diff --git a/napi/parser/index.d.ts b/napi/parser/index.d.ts
index a36ba4bec6090..c5865fb628a33 100644
--- a/napi/parser/index.d.ts
+++ b/napi/parser/index.d.ts
@@ -2,6 +2,30 @@
 /* eslint-disable */
 
 export * from '@oxc-project/types';
+/** A Parser instance that holds a MagicString. */
+export declare class ParserBuilder {
+  constructor(sourceText: string)
+  /**
+   * # Panics
+   *
+   * * File extension is invalid
+   * * Serde JSON serialization
+   */
+  parseSync(options?: ParserOptions | undefined | null): ParseResult
+  sourceText(start: number, end: number): string
+  toString(): string
+  len(): number
+  append(source: string): void
+  appendLeft(textIndex: number, content: string): void
+  appendRight(textIndex: number, content: string): void
+  indent(): void
+  prepend(source: string): void
+  prependLeft(textIndex: number, content: string): void
+  relocate(start: number, end: number, to: number): void
+  remove(start: number, end: number): void
+  update(start: number, end: number, content: string): void
+}
+
 export interface Comment {
   type: 'Line' | 'Block'
   value: string
@@ -89,7 +113,7 @@ export declare function moduleLexerSync(sourceText: string, options?: ParserOpti
 /**
  * # Panics
  *
- * * Tokio crashes
+ * * Internal runtime (tokio) crashes
  */
 export declare function parseAsync(sourceText: string, options?: ParserOptions | undefined | null): Promise<ParseResult>
 
diff --git a/napi/parser/index.js b/napi/parser/index.js
index fcedfd9cf3a0f..88f9760ca5212 100644
--- a/napi/parser/index.js
+++ b/napi/parser/index.js
@@ -14,3 +14,11 @@ module.exports.parseSync = function parseSync(...args) {
   result.program = JSON.parse(result.program);
   return result;
 };
+
+const parseSyncFn = bindings.ParserBuilder.prototype.parseSync;
+bindings.ParserBuilder.prototype.parseSync = function parseSync(...args) {
+  const result = parseSyncFn.apply(this, args);
+  result.program = JSON.parse(result.program);
+  return result;
+};
+module.exports.ParserBuilder = bindings.ParserBuilder;
diff --git a/napi/parser/src/lib.rs b/napi/parser/src/lib.rs
index 08add6965e2fd..0d80578af8f03 100644
--- a/napi/parser/src/lib.rs
+++ b/napi/parser/src/lib.rs
@@ -1,3 +1,5 @@
+#![allow(clippy::needless_pass_by_value)]
+
 mod module_lexer;
 
 use std::sync::Arc;
@@ -5,6 +7,8 @@ use std::sync::Arc;
 use napi::{bindgen_prelude::AsyncTask, Task};
 use napi_derive::napi;
 
+use self_cell::self_cell;
+
 use oxc::{
     allocator::Allocator,
     ast::CommentKind,
@@ -15,6 +19,152 @@ use oxc::{
 };
 
 pub use crate::module_lexer::*;
+use string_wizard::MagicString;
+
+/// A Parser instance that holds a MagicString.
+#[napi]
+pub struct ParserBuilder {
+    cell: ParserBuilderImpl,
+}
+
+self_cell!(
+    struct ParserBuilderImpl {
+        owner: String,
+
+        #[covariant]
+        dependent: MagicString,
+    }
+);
+
+#[napi]
+impl ParserBuilder {
+    #[napi(constructor)]
+    pub fn new(source_text: String) -> Self {
+        Self { cell: ParserBuilderImpl::new(source_text, |s| MagicString::new(s)) }
+    }
+
+    /// # Panics
+    ///
+    /// * File extension is invalid
+    /// * Serde JSON serialization
+    #[napi]
+    pub fn parse_sync(&mut self, options: Option<ParserOptions>) -> ParseResult {
+        let options = options.unwrap_or_default();
+        // TODO: update magic string filename here.
+        parse_with_return(self.cell.borrow_owner(), &options)
+    }
+
+    #[napi]
+    pub fn source_text(&self, start: u32, end: u32) -> &str {
+        &self.cell.borrow_owner()[start as usize..end as usize]
+    }
+
+    #[napi]
+    #[allow(clippy::inherent_to_string)]
+    pub fn to_string(&self) -> String {
+        self.cell.borrow_dependent().to_string()
+    }
+
+    #[napi]
+    #[allow(clippy::len_without_is_empty, clippy::cast_possible_truncation)]
+    pub fn len(&self) -> u32 {
+        self.cell.borrow_dependent().len() as u32
+    }
+
+    // #[napi]
+    // pub fn generate_map(&self) -> oxc::napi::source_map::SourceMap {
+    // let json = self.cell.borrow_dependent().source_map(SourceMapOptions::default()).to_json();
+    // oxc::napi::source_map::SourceMap {
+    // file: json.file,
+    // mappings: json.mappings,
+    // names: json.names,
+    // source_root: json.source_root,
+    // sources: json.sources,
+    // sources_content: json.sources_content.map(|content| {
+    // content.into_iter().map(Option::unwrap_or_default).collect::<Vec<_>>()
+    // }),
+    // version: 3,
+    // x_google_ignorelist: None,
+    // }
+    // }
+
+    #[napi]
+    pub fn append(&mut self, source: String) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.append(source);
+        });
+    }
+
+    #[napi]
+    pub fn append_left(&mut self, text_index: u32, content: String) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.append_left(text_index as usize, content);
+        });
+    }
+
+    #[napi]
+    pub fn append_right(&mut self, text_index: u32, content: String) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.append_left(text_index as usize, content);
+        });
+    }
+
+    #[napi]
+    pub fn indent(&mut self) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.indent();
+        });
+    }
+
+    // #[napi]
+    // pub fn indent_with(&mut self, opts: string_wizard::IndentOptions<'_, '_>) {
+    // self.cell.with_dependent_mut(|_, s| {
+    // s.indent_with(&content, opts);
+    // });
+    // }
+
+    #[napi]
+    pub fn prepend(&mut self, source: String) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.prepend(source);
+        });
+    }
+
+    #[napi]
+    pub fn prepend_left(&mut self, text_index: u32, content: String) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.prepend_left(text_index as usize, content);
+        });
+    }
+
+    #[napi]
+    pub fn relocate(&mut self, start: u32, end: u32, to: u32) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.relocate(start as usize, end as usize, to as usize);
+        });
+    }
+
+    #[napi]
+    pub fn remove(&mut self, start: u32, end: u32) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.remove(start as usize, end as usize);
+        });
+    }
+
+    #[napi]
+    pub fn update(&mut self, start: u32, end: u32, content: String) {
+        self.cell.with_dependent_mut(|_, s| {
+            s.update(start as usize, end as usize, content);
+        });
+    }
+
+    // #[napi]
+    // pub fn update_with(&mut self, start: u32, end: u32, content: String, opts: UpdateOptions) {
+    // self.cell.with_dependent_mut(|_, s| {
+    // s.update_with(start as usize, end as usize, content, opts);
+    // });
+    // }
+}
 
 fn parse<'a>(
     allocator: &'a Allocator,
@@ -46,7 +196,6 @@ fn parse<'a>(
 ///
 /// * File extension is invalid
 /// * Serde JSON serialization
-#[allow(clippy::needless_pass_by_value)]
 #[napi]
 pub fn parse_without_return(source_text: String, options: Option<ParserOptions>) {
     let options = options.unwrap_or_default();
@@ -94,7 +243,6 @@ fn parse_with_return<'a>(source_text: &'a str, options: &ParserOptions) -> Parse
 ///
 /// * File extension is invalid
 /// * Serde JSON serialization
-#[allow(clippy::needless_pass_by_value)]
 #[napi]
 pub fn parse_sync(source_text: String, options: Option<ParserOptions>) -> ParseResult {
     let options = options.unwrap_or_default();
@@ -122,8 +270,7 @@ impl Task for ResolveTask {
 
 /// # Panics
 ///
-/// * Tokio crashes
-#[allow(clippy::needless_pass_by_value)]
+/// * Internal runtime (tokio) crashes
 #[napi]
 pub fn parse_async(source_text: String, options: Option<ParserOptions>) -> AsyncTask<ResolveTask> {
     let options = options.unwrap_or_default();
diff --git a/napi/parser/test/magic_string.test.ts b/napi/parser/test/magic_string.test.ts
new file mode 100644
index 0000000000000..20db304b8e379
--- /dev/null
+++ b/napi/parser/test/magic_string.test.ts
@@ -0,0 +1,28 @@
+import { assert, describe, it } from 'vitest';
+
+import type { StringLiteral, VariableDeclaration } from '../index.js';
+import { ParserBuilder } from '../index.js';
+
+describe('simple', () => {
+  const code = 'const s: String = "测试"';
+
+  it('calls magic string APIs', () => {
+    // `oxc` holds a magic string instance on the Rust side.
+    const oxc = new ParserBuilder(code);
+
+    const ast = oxc.parseSync({ sourceFilename: 'test.ts' }).program;
+    const declaration = ast.body[0] as VariableDeclaration;
+    const stringLiteral = declaration.declarations[0].init as StringLiteral;
+
+    // These spans are in utf8 offsets.
+    const start = stringLiteral.start + 1;
+    const end = stringLiteral.end - 1;
+
+    // Access source text by utf8 offset.
+    assert.equal(oxc.sourceText(start, end), '测试');
+
+    // Magic string manipulation.
+    oxc.remove(start, end);
+    assert.equal(oxc.toString(), 'const s: String = ""');
+  });
+});
diff --git a/napi/transform/index.d.ts b/napi/transform/index.d.ts
index 5e3100e1bf82e..abac5894f1fa9 100644
--- a/napi/transform/index.d.ts
+++ b/napi/transform/index.d.ts
@@ -215,7 +215,7 @@ export interface TransformOptions {
    *
    * @default `esnext` (No transformation)
    *
-   * @see [esbuild#target](<https://esbuild.github.io/api/#target)
+   * @see [esbuild#target](https://esbuild.github.io/api/#target)
    */
   target?: string | Array<string>
   /** Define Plugin */