From 5b873da2da90dbc3107b6c8e088dc62f9647e70b Mon Sep 17 00:00:00 2001
From: Ryan Day <ryaneday@google.com>
Date: Mon, 9 Mar 2026 13:17:17 -0700
Subject: [PATCH] wasm-compose: remove im-rc dependency

---
 Cargo.lock                       | 59 ++------------------------------
 crates/wasm-compose/Cargo.toml   |  1 -
 crates/wasm-compose/src/graph.rs |  2 +-
 3 files changed, 3 insertions(+), 59 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 1087f8d60d..3902596772 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -188,15 +188,6 @@ version = "2.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "1b8e56985ec62d17e9c1001dc89c88ecd7dc08e47eba5ec7c29c7b5eeecde967"
 
-[[package]]
-name = "bitmaps"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "031043d04099746d8db04daf1fa424b2bc8bd69d92b25962dcde24da39ab64a2"
-dependencies = [
- "typenum",
-]
-
 [[package]]
 name = "blake3"
 version = "1.8.2"
@@ -1132,20 +1123,6 @@ dependencies = [
  "icu_properties",
 ]
 
-[[package]]
-name = "im-rc"
-version = "15.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "af1955a75fa080c677d3972822ec4bad316169ab1cfc6c257a942c2265dbe5fe"
-dependencies = [
- "bitmaps",
- "rand_core 0.6.4",
- "rand_xoshiro",
- "sized-chunks",
- "typenum",
- "version_check",
-]
-
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -1626,7 +1603,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9fbfd9d094a40bf3ae768db9361049ace4c0e04a4fd6b359518bd7b73a73dd97"
 dependencies = [
  "rand_chacha",
- "rand_core 0.9.3",
+ "rand_core",
 ]
 
 [[package]]
@@ -1636,15 +1613,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d3022b5f1df60f26e1ffddd6c66e8aa15de382ae63b3a0c1bfc0e4d3e3f325cb"
 dependencies = [
  "ppv-lite86",
- "rand_core 0.9.3",
+ "rand_core",
 ]
 
-[[package]]
-name = "rand_core"
-version = "0.6.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
-
 [[package]]
 name = "rand_core"
 version = "0.9.3"
@@ -1654,15 +1625,6 @@ dependencies = [
  "getrandom",
 ]
 
-[[package]]
-name = "rand_xoshiro"
-version = "0.6.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6f97cdb2a36ed4183de61b2f824cc45c9f1037f28afe0a322e9fff4c108b5aaa"
-dependencies = [
- "rand_core 0.6.4",
-]
-
 [[package]]
 name = "rayon"
 version = "1.10.0"
@@ -1858,16 +1820,6 @@ version = "1.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
 
-[[package]]
-name = "sized-chunks"
-version = "0.6.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16d69225bde7a69b235da73377861095455d298f2b970996eec25ddbb42b3d1e"
-dependencies = [
- "bitmaps",
- "typenum",
-]
-
 [[package]]
 name = "slab"
 version = "0.4.11"
@@ -2067,12 +2019,6 @@ version = "2.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6af6ae20167a9ece4bcb41af5b80f8a1f1df981f6391189ce00fd257af04126a"
 
-[[package]]
-name = "typenum"
-version = "1.18.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1dccffe3ce07af9386bfd29e80c0ab1a8205a2fc34e4bcd40364df902cfa8f3f"
-
 [[package]]
 name = "unicode-ident"
 version = "1.0.18"
@@ -2170,7 +2116,6 @@ dependencies = [
  "anyhow",
  "glob",
  "heck",
- "im-rc",
  "indexmap 2.13.0",
  "log",
  "petgraph",
diff --git a/crates/wasm-compose/Cargo.toml b/crates/wasm-compose/Cargo.toml
index 7f324a2100..c523c181bc 100644
--- a/crates/wasm-compose/Cargo.toml
+++ b/crates/wasm-compose/Cargo.toml
@@ -17,7 +17,6 @@ workspace = true
 [dependencies]
 anyhow = { workspace = true }
 heck = "0.5.0"
-im-rc = "15.1.0"
 indexmap = { workspace = true, features = ["std", "serde"] }
 log = { workspace = true }
 petgraph = "0.6.2"
diff --git a/crates/wasm-compose/src/graph.rs b/crates/wasm-compose/src/graph.rs
index 1769b023ec..57839e5023 100644
--- a/crates/wasm-compose/src/graph.rs
+++ b/crates/wasm-compose/src/graph.rs
@@ -474,7 +474,7 @@ pub struct EncodeOptions {
 
 #[derive(Clone, Debug, Default)]
 pub(crate) struct ResourceMapping {
-    map: im_rc::HashMap<ResourceId, (ComponentId, ResourceId)>,
+    map: HashMap<ResourceId, (ComponentId, ResourceId)>,
 }
 
 impl ResourceMapping {