diff --git a/Cargo.lock b/Cargo.lock
index 9ea25c8..c03b996 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -17,33 +17,12 @@ dependencies = [
  "memchr",
 ]
 
-[[package]]
-name = "android-tzdata"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
-
-[[package]]
-name = "android_system_properties"
-version = "0.1.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
-dependencies = [
- "libc",
-]
-
 [[package]]
 name = "autocfg"
 version = "1.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c08606f8c3cbf4ce6ec8e28fb0014a2c086708fe954eaa885384a6165172e7e8"
 
-[[package]]
-name = "base64"
-version = "0.22.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "72b3254f16251a8381aa12e40e3c4d2f0199f8c6508fbecb9d91f575e0fbb8c6"
-
 [[package]]
 name = "bit-set"
 version = "0.8.0"
@@ -71,12 +50,6 @@ version = "2.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b8e56985ec62d17e9c1001dc89c88ecd7dc08e47eba5ec7c29c7b5eeecde967"
 
-[[package]]
-name = "bumpalo"
-version = "3.19.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "46c5e41b57b8bba42a04676d81cb89e9ee8e859a1a66f80a5a72e1cb76b34d43"
-
 [[package]]
 name = "byteorder"
 version = "1.5.0"
@@ -89,34 +62,12 @@ version = "1.10.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d71b6127be86fdcfddb610f7182ac57211d4b18a3e9c82eb2d17662f2227ad6a"
 
-[[package]]
-name = "cc"
-version = "1.2.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d487aa071b5f64da6f19a3e848e3578944b726ee5a4854b82172f02aa876bfdc"
-dependencies = [
- "shlex",
-]
-
 [[package]]
 name = "cfg-if"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9555578bc9e57714c812a1f84e4fc5b4d21fcb063490c624de019f7464c91268"
 
-[[package]]
-name = "chrono"
-version = "0.4.41"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c469d952047f47f91b68d1cba3f10d63c11d73e4636f24f08daf0278abf01c4d"
-dependencies = [
- "android-tzdata",
- "iana-time-zone",
- "num-traits",
- "serde",
- "windows-link",
-]
-
 [[package]]
 name = "clean-path"
 version = "0.2.1"
@@ -142,63 +93,6 @@ dependencies = [
  "once_cell",
 ]
 
-[[package]]
-name = "core-foundation-sys"
-version = "0.8.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
-
-[[package]]
-name = "darling"
-version = "0.20.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc7f46116c46ff9ab3eb1597a45688b6715c6e628b5c133e288e709a29bcb4ee"
-dependencies = [
- "darling_core",
- "darling_macro",
-]
-
-[[package]]
-name = "darling_core"
-version = "0.20.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0d00b9596d185e565c2207a0b01f8bd1a135483d02d9b7b0a54b11da8d53412e"
-dependencies = [
- "fnv",
- "ident_case",
- "proc-macro2",
- "quote",
- "strsim",
- "syn",
-]
-
-[[package]]
-name = "darling_macro"
-version = "0.20.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fc34b93ccb385b40dc71c6fceac4b2ad23662c7eeb248cf10d529b7e055b6ead"
-dependencies = [
- "darling_core",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "deranged"
-version = "0.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c9e6a11ca8224451684bc0d7d5a7adbf8f2fd6887261a1cfc3c0432f9d4068e"
-dependencies = [
- "powerfmt",
- "serde",
-]
-
-[[package]]
-name = "dyn-clone"
-version = "1.0.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1c7a8fb8a9fbf66c1f703fe16184d10ca0ee9d23be5b4436400408ba54a95005"
-
 [[package]]
 name = "endian-type"
 version = "0.1.2"
@@ -234,12 +128,6 @@ dependencies = [
  "regex-syntax",
 ]
 
-[[package]]
-name = "fnv"
-version = "1.0.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
-
 [[package]]
 name = "futures-core"
 version = "0.3.31"
@@ -289,12 +177,6 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8d1add55171497b4705a648c6b583acafb01d58050a51727785f0b2c8e0a2b2"
 
-[[package]]
-name = "hashbrown"
-version = "0.12.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
-
 [[package]]
 name = "hashbrown"
 version = "0.15.4"
@@ -307,53 +189,6 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
-[[package]]
-name = "hex"
-version = "0.4.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
-
-[[package]]
-name = "iana-time-zone"
-version = "0.1.63"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b0c919e5debc312ad217002b8048a17b7d83f80703865bbfcfebb0458b0b27d8"
-dependencies = [
- "android_system_properties",
- "core-foundation-sys",
- "iana-time-zone-haiku",
- "js-sys",
- "log",
- "wasm-bindgen",
- "windows-core",
-]
-
-[[package]]
-name = "iana-time-zone-haiku"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
-dependencies = [
- "cc",
-]
-
-[[package]]
-name = "ident_case"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
-
-[[package]]
-name = "indexmap"
-version = "1.9.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd070e393353796e801d209ad339e89596eb4c8d430d18ede6a1cced8fafbd99"
-dependencies = [
- "autocfg",
- "hashbrown 0.12.3",
- "serde",
-]
-
 [[package]]
 name = "indexmap"
 version = "2.10.0"
@@ -361,7 +196,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "fe4cd85333e22411419a0bcae1297d25e58c9443848b11dc6a86fefe8c78a661"
 dependencies = [
  "equivalent",
- "hashbrown 0.15.4",
+ "hashbrown",
  "serde",
 ]
 
@@ -371,28 +206,12 @@ version = "1.0.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4a5f13b858c8d314ee3e8f639011f7ccefe71f97f96e50151fb991f267928e2c"
 
-[[package]]
-name = "js-sys"
-version = "0.3.77"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1cfaf33c695fc6e08064efbc1f72ec937429614f25eef83af942d0e227c3a28f"
-dependencies = [
- "once_cell",
- "wasm-bindgen",
-]
-
 [[package]]
 name = "libc"
 version = "0.2.174"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1171693293099992e19cddea4e8b849964e9846f4acee11b3948bcc337be8776"
 
-[[package]]
-name = "log"
-version = "0.4.27"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "13dc2df351e3202783a1fe0d44375f7295ffb4049267b0f3018346dc122a1d94"
-
 [[package]]
 name = "mach2"
 version = "0.4.3"
@@ -465,21 +284,6 @@ dependencies = [
  "pin-utils",
 ]
 
-[[package]]
-name = "num-conv"
-version = "0.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "51d515d32fb182ee37cda2ccdcb92950d6a3c2893aa280e540671c2cd0f3b1d9"
-
-[[package]]
-name = "num-traits"
-version = "0.2.19"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "071dfc062690e90b734c0b2273ce72ad0ffa95f0c74596bc250dcfd960262841"
-dependencies = [
- "autocfg",
-]
-
 [[package]]
 name = "once_cell"
 version = "1.21.3"
@@ -518,7 +322,7 @@ dependencies = [
  "clean-path",
  "concurrent_lru",
  "fancy-regex",
- "indexmap 2.10.0",
+ "indexmap",
  "miniz_oxide",
  "mmap-rs",
  "path-slash",
@@ -528,16 +332,9 @@ dependencies = [
  "rustc-hash",
  "serde",
  "serde_json",
- "serde_with",
  "thiserror 2.0.12",
 ]
 
-[[package]]
-name = "powerfmt"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "439ee305def115ba05938db6eb1644ff94165c5ab5e9420d1c1bcedbba909391"
-
 [[package]]
 name = "proc-macro-crate"
 version = "3.3.0"
@@ -575,26 +372,6 @@ dependencies = [
  "nibble_vec",
 ]
 
-[[package]]
-name = "ref-cast"
-version = "1.0.24"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4a0ae411dbe946a674d89546582cea4ba2bb8defac896622d6496f14c23ba5cf"
-dependencies = [
- "ref-cast-impl",
-]
-
-[[package]]
-name = "ref-cast-impl"
-version = "1.0.24"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1165225c21bff1f3bbce98f5a1f889949bc902d3575308cc7b0de30b4f6d27c7"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "regex"
 version = "1.11.1"
@@ -675,12 +452,6 @@ dependencies = [
  "semver",
 ]
 
-[[package]]
-name = "rustversion"
-version = "1.0.21"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a0d197bd2c9dc6e53b84da9556a69ba4cdfab8619eb41a8bd1cc2027a0f6b1d"
-
 [[package]]
 name = "ryu"
 version = "1.0.20"
@@ -696,18 +467,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "schemars"
-version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4cd191f9397d57d581cddd31014772520aa448f65ef991055d7f61582c65165f"
-dependencies = [
- "dyn-clone",
- "ref-cast",
- "serde",
- "serde_json",
-]
-
 [[package]]
 name = "semver"
 version = "1.0.26"
@@ -746,43 +505,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "serde_with"
-version = "3.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bf65a400f8f66fb7b0552869ad70157166676db75ed8181f8104ea91cf9d0b42"
-dependencies = [
- "base64",
- "chrono",
- "hex",
- "indexmap 1.9.3",
- "indexmap 2.10.0",
- "schemars",
- "serde",
- "serde_derive",
- "serde_json",
- "serde_with_macros",
- "time",
-]
-
-[[package]]
-name = "serde_with_macros"
-version = "3.13.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "81679d9ed988d5e9a5e6531dc3f2c28efbd639cbd1dfb628df08edea6004da77"
-dependencies = [
- "darling",
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "shlex"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
-
 [[package]]
 name = "slab"
 version = "0.4.10"
@@ -795,12 +517,6 @@ version = "1.15.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
 
-[[package]]
-name = "strsim"
-version = "0.11.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
-
 [[package]]
 name = "syn"
 version = "2.0.104"
@@ -866,37 +582,6 @@ dependencies = [
  "syn",
 ]
 
-[[package]]
-name = "time"
-version = "0.3.41"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a7619e19bc266e0f9c5e6686659d394bc57973859340060a69221e57dbc0c40"
-dependencies = [
- "deranged",
- "itoa",
- "num-conv",
- "powerfmt",
- "serde",
- "time-core",
- "time-macros",
-]
-
-[[package]]
-name = "time-core"
-version = "0.1.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c9e9a38711f559d9e3ce1cdb06dd7c5b8ea546bc90052da6d06bb76da74bb07c"
-
-[[package]]
-name = "time-macros"
-version = "0.2.22"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3526739392ec93fd8b359c8e98514cb3e8e021beb4e5f597b00a0221f8ed8a49"
-dependencies = [
- "num-conv",
- "time-core",
-]
-
 [[package]]
 name = "toml_datetime"
 version = "0.6.11"
@@ -909,7 +594,7 @@ version = "0.22.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "41fe8c660ae4257887cf66394862d21dbca4a6ddd26f04a3560410406a2f819a"
 dependencies = [
- "indexmap 2.10.0",
+ "indexmap",
  "toml_datetime",
  "winnow",
 ]
@@ -930,64 +615,6 @@ dependencies = [
  "winapi-util",
 ]
 
-[[package]]
-name = "wasm-bindgen"
-version = "0.2.100"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1edc8929d7499fc4e8f0be2262a241556cfc54a0bea223790e71446f2aab1ef5"
-dependencies = [
- "cfg-if",
- "once_cell",
- "rustversion",
- "wasm-bindgen-macro",
-]
-
-[[package]]
-name = "wasm-bindgen-backend"
-version = "0.2.100"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2f0a0651a5c2bc21487bde11ee802ccaf4c51935d0d3d42a6101f98161700bc6"
-dependencies = [
- "bumpalo",
- "log",
- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-shared",
-]
-
-[[package]]
-name = "wasm-bindgen-macro"
-version = "0.2.100"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7fe63fc6d09ed3792bd0897b314f53de8e16568c2b3f7982f468c0bf9bd0b407"
-dependencies = [
- "quote",
- "wasm-bindgen-macro-support",
-]
-
-[[package]]
-name = "wasm-bindgen-macro-support"
-version = "0.2.100"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8ae87ea40c9f689fc23f209965b6fb8a99ad69aeeb0231408be24920604395de"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "wasm-bindgen-backend",
- "wasm-bindgen-shared",
-]
-
-[[package]]
-name = "wasm-bindgen-shared"
-version = "0.2.100"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1a05d73b933a847d6cccdda8f838a22ff101ad9bf93e33684f39c1f5f0eece3d"
-dependencies = [
- "unicode-ident",
-]
-
 [[package]]
 name = "widestring"
 version = "1.2.0"
@@ -1012,65 +639,6 @@ dependencies = [
  "windows-targets 0.48.5",
 ]
 
-[[package]]
-name = "windows-core"
-version = "0.61.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0fdd3ddb90610c7638aa2b3a3ab2904fb9e5cdbecc643ddb3647212781c4ae3"
-dependencies = [
- "windows-implement",
- "windows-interface",
- "windows-link",
- "windows-result",
- "windows-strings",
-]
-
-[[package]]
-name = "windows-implement"
-version = "0.60.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a47fddd13af08290e67f4acabf4b459f647552718f683a7b415d290ac744a836"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "windows-interface"
-version = "0.59.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bd9211b69f8dcdfa817bfd14bf1c97c9188afa36f4750130fcdf3f400eca9fa8"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
-[[package]]
-name = "windows-link"
-version = "0.1.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e6ad25900d524eaabdbbb96d20b4311e1e7ae1699af4fb28c17ae66c80d798a"
-
-[[package]]
-name = "windows-result"
-version = "0.3.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56f42bd332cc6c8eac5af113fc0c1fd6a8fd2aa08a0119358686e5160d0586c6"
-dependencies = [
- "windows-link",
-]
-
-[[package]]
-name = "windows-strings"
-version = "0.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "56e6c93f3a0c3b36176cb1327a4958a0353d5d166c2a35cb268ace15e91d3b57"
-dependencies = [
- "windows-link",
-]
-
 [[package]]
 name = "windows-sys"
 version = "0.59.0"
diff --git a/Cargo.toml b/Cargo.toml
index ecb4ae8..73b3ea1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ byteorder = "1"
 clean-path = "0.2.1"
 concurrent_lru = "^0.2"
 fancy-regex = { version = "^0.14.0", default-features = false, features = ["std"] }
-indexmap = { version = "2", features = ["serde"] }
+indexmap = { version = "2", default-features = true, features = ["serde"] }
 miniz_oxide = "^0.8"
 mmap-rs = { version = "^0.6", optional = true }
 path-slash = "0.2.1"
@@ -20,7 +20,6 @@ pathdiff = "^0.2"
 radix_trie = "0.2.1"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1"
-serde_with = {  version = "3", features = ["indexmap_2"] }
 thiserror = "2"
 rustc-hash = "2"
 
diff --git a/src/lib.rs b/src/lib.rs
index 8536dbd..ca0a89c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -2,27 +2,24 @@ pub mod fs;
 
 mod builtins;
 mod error;
+mod manifest;
 mod util;
 mod zip;
 
 use std::{
     collections::hash_map::Entry,
-    hash::BuildHasherDefault,
     path::{Path, PathBuf},
     sync::OnceLock,
 };
 
 use fancy_regex::Regex;
-use indexmap::IndexMap;
-use rustc_hash::{FxHashMap, FxHashSet, FxHasher};
-use serde::Deserialize;
-use serde_with::{DefaultOnNull, serde_as};
 
-use crate::util::RegexDef;
-
-pub use crate::error::{
-    BadSpecifier, Error, FailedManifestHydration, MissingDependency, MissingPeerDependency,
-    UndeclaredDependency,
+pub use crate::{
+    error::{
+        BadSpecifier, Error, FailedManifestHydration, MissingDependency, MissingPeerDependency,
+        UndeclaredDependency,
+    },
+    manifest::{Manifest, PackageDependency, PackageInformation, PackageLocator},
 };
 
 #[derive(Debug)]
@@ -47,80 +44,6 @@ pub struct ResolutionConfig {
     pub host: ResolutionHost,
 }
 
-#[derive(Clone, Debug, Default, Deserialize, Eq, Hash, PartialEq)]
-pub struct PackageLocator {
-    name: String,
-    reference: String,
-}
-
-#[derive(Clone, Debug, Deserialize)]
-#[serde(untagged)]
-enum PackageDependency {
-    Reference(String),
-    Alias(String, String),
-}
-
-#[serde_as]
-#[derive(Clone, Debug, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct PackageInformation {
-    package_location: PathBuf,
-
-    #[serde(default)]
-    discard_from_lookup: bool,
-
-    #[serde_as(as = "Vec<(_, Option<_>)>")]
-    package_dependencies: FxHashMap<String, Option<PackageDependency>>,
-}
-
-#[serde_as]
-#[derive(Clone, Debug, Deserialize)]
-#[serde(rename_all = "camelCase")]
-pub struct Manifest {
-    #[serde(skip_deserializing)]
-    pub manifest_dir: PathBuf,
-
-    #[serde(skip_deserializing)]
-    pub manifest_path: PathBuf,
-
-    #[serde(skip_deserializing)]
-    location_trie: util::Trie<PackageLocator>,
-
-    enable_top_level_fallback: bool,
-    ignore_pattern_data: Option<RegexDef>,
-
-    // dependencyTreeRoots: [{
-    //   "name": "@app/monorepo",
-    //   "workspace:."
-    // }]
-    dependency_tree_roots: FxHashSet<PackageLocator>,
-
-    // fallbackPool: [[
-    //   "@app/monorepo",
-    //   "workspace:.",
-    // ]]
-    #[serde_as(as = "Vec<(_, _)>")]
-    fallback_pool: FxHashMap<String, Option<PackageDependency>>,
-
-    // fallbackExclusionList: [[
-    //   "@app/server",
-    //  ["workspace:sources/server"],
-    // ]]
-    #[serde_as(as = "Vec<(_, _)>")]
-    fallback_exclusion_list: FxHashMap<String, FxHashSet<String>>,
-
-    // packageRegistryData: [
-    //   [null, [
-    //     [null, {
-    //       ...
-    //     }]
-    //   }]
-    // ]
-    #[serde_as(as = "Vec<(DefaultOnNull<_>, Vec<(DefaultOnNull<_>, _)>)>")]
-    package_registry_data:
-        FxHashMap<String, IndexMap<String, PackageInformation, BuildHasherDefault<FxHasher>>>,
-}
-
 fn parse_scoped_package_name(specifier: &str) -> Option<(String, Option<String>)> {
     let mut segments = specifier.splitn(3, '/');
 
diff --git a/src/manifest.rs b/src/manifest.rs
new file mode 100644
index 0000000..5c82a56
--- /dev/null
+++ b/src/manifest.rs
@@ -0,0 +1,135 @@
+use std::{hash::BuildHasherDefault, path::PathBuf};
+
+use indexmap::IndexMap;
+use rustc_hash::{FxHashMap, FxHashSet, FxHasher};
+use serde::{Deserialize, de::Deserializer};
+
+use crate::util::{RegexDef, Trie};
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Manifest {
+    #[serde(skip_deserializing)]
+    pub manifest_dir: PathBuf,
+
+    #[serde(skip_deserializing)]
+    pub manifest_path: PathBuf,
+
+    #[serde(skip_deserializing)]
+    pub location_trie: Trie<PackageLocator>,
+
+    pub enable_top_level_fallback: bool,
+    pub ignore_pattern_data: Option<RegexDef>,
+
+    // dependencyTreeRoots: [{
+    //   "name": "@app/monorepo",
+    //   "workspace:."
+    // }]
+    pub dependency_tree_roots: FxHashSet<PackageLocator>,
+
+    // fallbackPool: [[
+    //   "@app/monorepo",
+    //   "workspace:.",
+    // ]]
+    #[serde(deserialize_with = "deserialize_package_dependencies")]
+    pub fallback_pool: FxHashMap<String, Option<PackageDependency>>,
+
+    // fallbackExclusionList: [[
+    //   "@app/server",
+    //  ["workspace:sources/server"],
+    // ]]
+    #[serde(deserialize_with = "deserialize_fallback_exclusion_list")]
+    pub fallback_exclusion_list: FxHashMap<String, FxHashSet<String>>,
+
+    // packageRegistryData: [
+    //   [null, [
+    //     [null, {
+    //       ...
+    //     }]
+    //   }]
+    // ]
+    #[serde(deserialize_with = "deserialize_package_registry_data")]
+    pub package_registry_data:
+        FxHashMap<String, IndexMap<String, PackageInformation, BuildHasherDefault<FxHasher>>>,
+}
+
+#[derive(Clone, Debug, Default, Eq, PartialEq, Hash, Deserialize)]
+pub struct PackageLocator {
+    pub name: String,
+    pub reference: String,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PackageInformation {
+    pub package_location: PathBuf,
+
+    #[serde(default)]
+    pub discard_from_lookup: bool,
+
+    #[serde(deserialize_with = "deserialize_package_dependencies")]
+    pub package_dependencies: FxHashMap<String, Option<PackageDependency>>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(untagged)]
+pub enum PackageDependency {
+    Reference(String),
+    Alias(String, String),
+}
+
+fn deserialize_fallback_exclusion_list<'de, D>(
+    deserializer: D,
+) -> Result<FxHashMap<String, FxHashSet<String>>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    #[derive(Debug, Deserialize)]
+    struct Item(String, FxHashSet<String>);
+
+    let mut map = FxHashMap::default();
+    for item in Vec::<Item>::deserialize(deserializer)? {
+        map.insert(item.0, item.1);
+    }
+    Ok(map)
+}
+
+fn deserialize_package_dependencies<'de, D>(
+    deserializer: D,
+) -> Result<FxHashMap<String, Option<PackageDependency>>, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    #[derive(Debug, Deserialize)]
+    struct Item(String, Option<PackageDependency>);
+
+    let mut map = FxHashMap::default();
+    for item in Vec::<Item>::deserialize(deserializer)? {
+        map.insert(item.0, item.1);
+    }
+    Ok(map)
+}
+
+#[expect(clippy::type_complexity)]
+fn deserialize_package_registry_data<'de, D>(
+    deserializer: D,
+) -> Result<
+    FxHashMap<String, IndexMap<String, PackageInformation, BuildHasherDefault<FxHasher>>>,
+    D::Error,
+>
+where
+    D: Deserializer<'de>,
+{
+    #[derive(Debug, Deserialize)]
+    struct Item(Option<String>, Vec<(Option<String>, PackageInformation)>);
+
+    let mut map = FxHashMap::default();
+    for item in Vec::<Item>::deserialize(deserializer)? {
+        let key = item.0.unwrap_or_else(|| "".to_string());
+        let value = IndexMap::from_iter(
+            item.1.into_iter().map(|(k, v)| (k.unwrap_or_else(|| "".to_string()), v)),
+        );
+        map.insert(key, value);
+    }
+    Ok(map)
+}