diff --git a/Cargo.lock b/Cargo.lock
index 0df38db7d6e908..42044dcf870f3c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -58,7 +58,7 @@ checksum = "a507401cad91ec6a857ed5513a2073c82a9b9048762b885bb98655b306964681"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -69,7 +69,7 @@ checksum = "3c87f3f15e7794432337fc718554eaa4dc8f04c9677a950ffe366f20a162ae42"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -158,7 +158,7 @@ checksum = "9a8d5b11f7fa1068e5bbac8ab6c8c2c6940047f69185987446b60c995d4bf89c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -180,12 +180,6 @@ dependencies = [
  "allocator-api2",
 ]
 
-[[package]]
-name = "byteorder"
-version = "1.5.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
-
 [[package]]
 name = "bytes"
 version = "1.6.0"
@@ -398,7 +392,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ad291aa74992b9b7a7e88c38acbbf6ad7e107f1d90ee8775b7bc1fc3394f485c"
 dependencies = [
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -518,19 +512,6 @@ dependencies = [
  "miniz_oxide",
 ]
 
-[[package]]
-name = "flexbuffers"
-version = "2.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "15d14128f06405808ce75bfebe11e9b0f9da18719ede6d7bdb1702d6bfe0f7e8"
-dependencies = [
- "bitflags 1.3.2",
- "byteorder",
- "num_enum",
- "serde",
- "serde_derive",
-]
-
 [[package]]
 name = "form_urlencoded"
 version = "1.2.1"
@@ -596,7 +577,7 @@ checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -999,7 +980,7 @@ checksum = "dcf09caffaac8068c346b6df2a7fc27a177fd20b39421a39ce0a211bde679a6c"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -1049,17 +1030,15 @@ dependencies = [
 
 [[package]]
 name = "napi"
-version = "2.16.1"
+version = "2.16.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c4ca998356d8ff9fba7a070dae4508a2298439c98c9f3bc9c07669538b999e8f"
+checksum = "70d04890ef4ec001fad791be785b8b920e2a3f5a6b1188e7a81dfa6197c0dee4"
 dependencies = [
  "bitflags 2.5.0",
  "ctor",
  "napi-derive",
  "napi-sys",
  "once_cell",
- "serde",
- "serde_json",
  "tokio",
 ]
 
@@ -1080,7 +1059,7 @@ dependencies = [
  "napi-derive-backend",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -1095,14 +1074,14 @@ dependencies = [
  "quote",
  "regex",
  "semver",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
 name = "napi-sys"
-version = "2.3.0"
+version = "2.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2503fa6af34dc83fb74888df8b22afe933b58d37daf7d80424b1c60c68196b8b"
+checksum = "427802e8ec3a734331fec1035594a210ce1ff4dc5bc1950530920ab717964ea3"
 dependencies = [
  "libloading",
 ]
@@ -1170,27 +1149,6 @@ dependencies = [
  "libc",
 ]
 
-[[package]]
-name = "num_enum"
-version = "0.5.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1f646caf906c20226733ed5b1374287eb97e3c2a5c227ce668c1f2ce20ae57c9"
-dependencies = [
- "num_enum_derive",
-]
-
-[[package]]
-name = "num_enum_derive"
-version = "0.5.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dcbff9bc912032c62bf65ef1d5aea88983b420f4f839db1e9b0c281a25c9c799"
-dependencies = [
- "proc-macro-crate",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
 [[package]]
 name = "object"
 version = "0.32.2"
@@ -1234,7 +1192,7 @@ dependencies = [
  "proc-macro2",
  "proc-macro2-diagnostics",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -1481,7 +1439,7 @@ dependencies = [
  "itertools",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -1552,7 +1510,6 @@ dependencies = [
 name = "oxc_parser_napi"
 version = "0.0.0"
 dependencies = [
- "flexbuffers",
  "napi",
  "napi-build",
  "napi-derive",
@@ -1562,7 +1519,6 @@ dependencies = [
  "oxc_module_lexer",
  "oxc_parser",
  "oxc_span",
- "serde",
  "serde_json",
  "tokio",
 ]
@@ -1806,7 +1762,7 @@ dependencies = [
  "pest_meta",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -1860,7 +1816,7 @@ dependencies = [
  "phf_shared",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -1895,7 +1851,7 @@ checksum = "2f38a4412a78282e09a2cf38d195ea5420d15ba0602cb375210efbc877243965"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -1910,16 +1866,6 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
-[[package]]
-name = "proc-macro-crate"
-version = "1.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f4c021e1093a56626774e81216a4ce732a735e5bad4868a03f3ed65ca0c3919"
-dependencies = [
- "once_cell",
- "toml_edit",
-]
-
 [[package]]
 name = "proc-macro2"
 version = "1.0.79"
@@ -1937,7 +1883,7 @@ checksum = "af066a9c399a26e020ada66a034357a868728e72cd426f3adcd35f80d88d88c8"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
  "version_check",
  "yansi",
 ]
@@ -2228,7 +2174,7 @@ checksum = "7eb0b34b42edc17f6b7cac84a52a1c5f0e1bb2227e997ca9011ea3dd34e8610b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2239,7 +2185,7 @@ checksum = "e578a843d40b4189a4d66bba51d7684f57da5bd7c304c64e14bd63efbef49509"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2262,7 +2208,7 @@ checksum = "0b2e6b945e9d3df726b65d6ee24060aff8e3533d431f677a9695db04eff9dfdb"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2383,17 +2329,6 @@ dependencies = [
  "is_ci",
 ]
 
-[[package]]
-name = "syn"
-version = "1.0.109"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
-dependencies = [
- "proc-macro2",
- "quote",
- "unicode-ident",
-]
-
 [[package]]
 name = "syn"
 version = "2.0.58"
@@ -2445,7 +2380,7 @@ checksum = "c61f3ba182994efc43764a46c018c347bc492c79f024e705f46567b418f6d4f7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2510,7 +2445,7 @@ checksum = "5b8a1e28f2deaa14e508979454cb3a223b10b938b45af148bc0986de36f1923b"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2527,23 +2462,6 @@ dependencies = [
  "tracing",
 ]
 
-[[package]]
-name = "toml_datetime"
-version = "0.6.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3550f4e9685620ac18a50ed434eb3aec30db8ba93b0287467bca5826ea25baf1"
-
-[[package]]
-name = "toml_edit"
-version = "0.19.15"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b5bb770da30e5cbfde35a2d7b9b8a2c4b8ef89548a7a6aeab5c9a576e3e7421"
-dependencies = [
- "indexmap",
- "toml_datetime",
- "winnow",
-]
-
 [[package]]
 name = "tower"
 version = "0.4.13"
@@ -2595,7 +2513,7 @@ checksum = "84fd902d4e0b9a4b27f2f440108dc034e1758628a9b702f8ec61ad66355422fa"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2623,7 +2541,7 @@ checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2687,7 +2605,7 @@ dependencies = [
  "proc-macro2",
  "quote",
  "serde_derive_internals",
- "syn 2.0.58",
+ "syn",
 ]
 
 [[package]]
@@ -2866,7 +2784,7 @@ dependencies = [
  "once_cell",
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
  "wasm-bindgen-shared",
 ]
 
@@ -2888,7 +2806,7 @@ checksum = "e94f17b526d0a461a191c78ea52bbce64071ed5c04c9ffe424dcb38f74171bb7"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.58",
+ "syn",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
@@ -3081,15 +2999,6 @@ version = "0.52.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "32b752e52a2da0ddfbdbcc6fceadfeede4c939ed16d13e648833a61dfb611ed8"
 
-[[package]]
-name = "winnow"
-version = "0.5.40"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f593a95398737aeed53e489c785df13f3618e41dbcd6718c6addbf1395aa6876"
-dependencies = [
- "memchr",
-]
-
 [[package]]
 name = "yansi"
 version = "1.0.1"
diff --git a/Cargo.toml b/Cargo.toml
index c9c26b2569f0af..e9aaf0dcd47f14 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -89,6 +89,7 @@ oxc_tasks_common = { path = "tasks/common" }
 
 napi        = "2"
 napi-derive = "2"
+napi-build  = "2"
 
 assert-unchecked    = "0.1.2"
 allocator-api2      = "0.2.16"
@@ -147,13 +148,11 @@ console             = "0.15.8"
 encoding_rs         = "0.8.33"
 encoding_rs_io      = "0.1.7"
 env_logger          = { version = "0.11.3", default-features = false }
-flexbuffers         = "2.0.0"
 globset             = "0.4.14"
 humansize           = "2.1.3"
 json-strip-comments = "1.0.2"
 log                 = "0.4.21"
 memchr              = "2.7.2"
-napi-build          = "2"
 once_cell           = "1.19.0"
 ouroboros           = "0.18.3"
 owo-colors          = "4.0.0"
@@ -165,6 +164,9 @@ similar             = "2.5.0"
 textwrap            = "0.16.0"
 unicode-width       = "0.1.11"
 
+[workspace.metadata.cargo-shear]
+ignored = ["napi"]
+
 [profile.dev]
 debug = 1 # "limited" debug, speed up compilation; debug info without type or variable-level information.
 
diff --git a/crates/oxc_macros/Cargo.toml b/crates/oxc_macros/Cargo.toml
index b1ccf333311089..4afd75fba439cb 100644
--- a/crates/oxc_macros/Cargo.toml
+++ b/crates/oxc_macros/Cargo.toml
@@ -20,7 +20,7 @@ proc-macro = true
 doctest    = false
 
 [dependencies]
-syn          = { workspace = true, features = ["derive", "parsing", "proc-macro", "printing"]}
+syn          = { workspace = true, features = ["derive", "parsing", "proc-macro", "printing"] }
 quote        = { workspace = true }
 proc-macro2  = { workspace = true }
 itertools    = { workspace = true }
diff --git a/napi/parser/Cargo.toml b/napi/parser/Cargo.toml
index e28d3a8695f658..c131970a1996c2 100644
--- a/napi/parser/Cargo.toml
+++ b/napi/parser/Cargo.toml
@@ -28,13 +28,13 @@ oxc_span         = { workspace = true }
 oxc_diagnostics  = { workspace = true }
 oxc_module_lexer = { path = "../../crates/oxc_module_lexer" }
 
-serde       = { workspace = true }
-serde_json  = { workspace = true }
-flexbuffers = { workspace = true }
-
 tokio       = { workspace = true }
-napi        = { workspace = true, features = ["serde-json", "async"] }
+napi        = { workspace = true, features = ["async"] }
 napi-derive = { workspace = true }
+serde_json  = { workspace = true }
+
+[package.metadata.cargo-shear]
+ignored = ["napi"]
 
 [build-dependencies]
 napi-build = { workspace = true }
diff --git a/napi/parser/index.d.ts b/napi/parser/index.d.ts
index 73ef36e5c29c6a..3ef7d59deec537 100644
--- a/napi/parser/index.d.ts
+++ b/napi/parser/index.d.ts
@@ -121,16 +121,6 @@ export function parseWithoutReturn(sourceText: string, options?: ParserOptions |
  * * Serde JSON serialization
  */
 export function parseSync(sourceText: string, options?: ParserOptions | undefined | null): ParseResult
-/**
- * Returns a binary AST in flexbuffers format.
- * This is a POC API. Error handling is not done yet.
- *
- * # Panics
- *
- * * File extension is invalid
- * * FlexbufferSerializer serialization error
- */
-export function parseSyncBuffer(sourceText: string, options?: ParserOptions | undefined | null): Buffer
 /**
  * # Panics
  *
diff --git a/napi/parser/index.js b/napi/parser/index.js
index 5ea01928377157..0fcec097c7b003 100644
--- a/napi/parser/index.js
+++ b/napi/parser/index.js
@@ -295,11 +295,10 @@ if (!nativeBinding) {
   throw new Error(`Failed to load native binding`)
 }
 
-const { moduleLexerSync, moduleLexerAsync, parseWithoutReturn, parseSync, parseSyncBuffer, parseAsync } = nativeBinding
+const { moduleLexerSync, moduleLexerAsync, parseWithoutReturn, parseSync, parseAsync } = nativeBinding
 
 module.exports.moduleLexerSync = moduleLexerSync
 module.exports.moduleLexerAsync = moduleLexerAsync
 module.exports.parseWithoutReturn = parseWithoutReturn
 module.exports.parseSync = parseSync
-module.exports.parseSyncBuffer = parseSyncBuffer
 module.exports.parseAsync = parseAsync
diff --git a/napi/parser/src/lib.rs b/napi/parser/src/lib.rs
index 3086b0cc8bda7a..64794a1d1d6985 100644
--- a/napi/parser/src/lib.rs
+++ b/napi/parser/src/lib.rs
@@ -1,13 +1,8 @@
-#![allow(clippy::trailing_empty_array)]
-
 mod module_lexer;
 
 use std::sync::Arc;
 
-use flexbuffers::FlexbufferSerializer;
-use napi::bindgen_prelude::Buffer;
 use napi_derive::napi;
-use serde::Serialize;
 
 use oxc_allocator::Allocator;
 pub use oxc_ast::ast::Program;
@@ -130,24 +125,6 @@ pub fn parse_sync(source_text: String, options: Option<ParserOptions>) -> ParseR
     ParseResult { program, comments, errors }
 }
 
-/// Returns a binary AST in flexbuffers format.
-/// This is a POC API. Error handling is not done yet.
-///
-/// # Panics
-///
-/// * File extension is invalid
-/// * FlexbufferSerializer serialization error
-#[allow(clippy::needless_pass_by_value)]
-#[napi]
-pub fn parse_sync_buffer(source_text: String, options: Option<ParserOptions>) -> Buffer {
-    let options = options.unwrap_or_default();
-    let allocator = Allocator::default();
-    let ret = parse(&allocator, &source_text, &options);
-    let mut serializer = FlexbufferSerializer::new();
-    ret.program.serialize(&mut serializer).unwrap();
-    serializer.take_buffer().into()
-}
-
 /// # Panics
 ///
 /// * Tokio crashes