diff --git a/libraries/no-data-view/src/int16.ts b/libraries/no-data-view/src/int16.ts
index 6e0c5e9c..732a9a26 100644
--- a/libraries/no-data-view/src/int16.ts
+++ b/libraries/no-data-view/src/int16.ts
@@ -1,3 +1,4 @@
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt16LittleEndian(
     buffer: Uint8Array,
     offset: number,
@@ -5,10 +6,12 @@ export function getInt16LittleEndian(
     return ((buffer[offset]! | (buffer[offset + 1]! << 8)) << 16) >> 16;
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt16BigEndian(buffer: Uint8Array, offset: number): number {
     return (((buffer[offset]! << 8) | buffer[offset + 1]!) << 16) >> 16;
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt16(
     buffer: Uint8Array,
     offset: number,
@@ -19,6 +22,7 @@ export function getInt16(
         : (((buffer[offset]! << 8) | buffer[offset + 1]!) << 16) >> 16;
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function setInt16LittleEndian(
     buffer: Uint8Array,
     offset: number,
diff --git a/libraries/no-data-view/src/int32.ts b/libraries/no-data-view/src/int32.ts
index 1bf897ad..3157f4a1 100644
--- a/libraries/no-data-view/src/int32.ts
+++ b/libraries/no-data-view/src/int32.ts
@@ -1,3 +1,4 @@
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt32LittleEndian(
     buffer: Uint8Array,
     offset: number,
@@ -10,6 +11,7 @@ export function getInt32LittleEndian(
     );
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt32BigEndian(buffer: Uint8Array, offset: number): number {
     return (
         (buffer[offset]! << 24) |
@@ -19,6 +21,7 @@ export function getInt32BigEndian(buffer: Uint8Array, offset: number): number {
     );
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt32(
     buffer: Uint8Array,
     offset: number,
diff --git a/libraries/no-data-view/src/int64.ts b/libraries/no-data-view/src/int64.ts
index 209f8843..8d630d9e 100644
--- a/libraries/no-data-view/src/int64.ts
+++ b/libraries/no-data-view/src/int64.ts
@@ -1,3 +1,4 @@
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt64LittleEndian(
     buffer: Uint8Array,
     offset: number,
@@ -14,6 +15,7 @@ export function getInt64LittleEndian(
     );
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt64BigEndian(buffer: Uint8Array, offset: number): bigint {
     return (
         (BigInt(buffer[offset]! << 24) << 32n) |
@@ -27,6 +29,7 @@ export function getInt64BigEndian(buffer: Uint8Array, offset: number): bigint {
     );
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt64(
     buffer: Uint8Array,
     offset: number,
diff --git a/libraries/no-data-view/src/int8.ts b/libraries/no-data-view/src/int8.ts
index 1423240a..9f72bf4f 100644
--- a/libraries/no-data-view/src/int8.ts
+++ b/libraries/no-data-view/src/int8.ts
@@ -1,3 +1,4 @@
+/* #__NO_SIDE_EFFECTS__ */
 export function getInt8(buffer: Uint8Array, offset: number): number {
     return (buffer[offset]! << 24) >> 24;
 }
diff --git a/libraries/no-data-view/src/uint16.ts b/libraries/no-data-view/src/uint16.ts
index a67e1943..6caa7342 100644
--- a/libraries/no-data-view/src/uint16.ts
+++ b/libraries/no-data-view/src/uint16.ts
@@ -1,3 +1,4 @@
+/* #__NO_SIDE_EFFECTS__ */
 export function getUint16LittleEndian(
     buffer: Uint8Array,
     offset: number,
@@ -5,10 +6,12 @@ export function getUint16LittleEndian(
     return buffer[offset]! | (buffer[offset + 1]! << 8);
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getUint16BigEndian(buffer: Uint8Array, offset: number): number {
     return (buffer[offset]! << 8) | buffer[offset + 1]!;
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getUint16(
     buffer: Uint8Array,
     offset: number,
diff --git a/libraries/no-data-view/src/uint32.ts b/libraries/no-data-view/src/uint32.ts
index c7250556..eb52445c 100644
--- a/libraries/no-data-view/src/uint32.ts
+++ b/libraries/no-data-view/src/uint32.ts
@@ -1,3 +1,4 @@
+/* #__NO_SIDE_EFFECTS__ */
 export function getUint32LittleEndian(
     buffer: Uint8Array,
     offset: number,
@@ -11,6 +12,7 @@ export function getUint32LittleEndian(
     );
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getUint32BigEndian(buffer: Uint8Array, offset: number): number {
     return (
         ((buffer[offset]! << 24) |
@@ -21,6 +23,7 @@ export function getUint32BigEndian(buffer: Uint8Array, offset: number): number {
     );
 }
 
+/* #__NO_SIDE_EFFECTS__ */
 export function getUint32(
     buffer: Uint8Array,
     offset: number,
diff --git a/libraries/struct/src/number.ts b/libraries/struct/src/number.ts
index 8514a05d..1eea6d5e 100644
--- a/libraries/struct/src/number.ts
+++ b/libraries/struct/src/number.ts
@@ -23,19 +23,18 @@ export interface NumberField<T> extends Field<T, never, never> {
 
 /* #__NO_SIDE_EFFECTS__ */
 function factory<T>(
-    fn: NumberField<T>,
     size: number,
     serialize: Field<T, never, never>["serialize"],
     deserialize: Field<T, never, never>["deserialize"],
 ) {
+    const fn: NumberField<T> = (() => fn) as never;
     fn.size = size;
     fn.serialize = serialize;
     fn.deserialize = deserialize;
+    return fn;
 }
 
-export const u8: NumberField<number> = (() => u8) as never;
-factory(
-    u8,
+export const u8: NumberField<number> = factory(
     1,
     (value, { buffer, index }) => {
         buffer[index] = value;
@@ -46,9 +45,7 @@ factory(
     }),
 );
 
-export const s8: NumberField<number> = (() => s8) as never;
-factory(
-    s8,
+export const s8: NumberField<number> = factory(
     1,
     (value, { buffer, index }) => {
         buffer[index] = value;
@@ -59,9 +56,7 @@ factory(
     }),
 );
 
-export const u16: NumberField<number> = (() => u16) as never;
-factory(
-    u16,
+export const u16: NumberField<number> = factory(
     2,
     (value, { buffer, index, littleEndian }) => {
         setUint16(buffer, index, value, littleEndian);
@@ -72,9 +67,7 @@ factory(
     }),
 );
 
-export const s16: NumberField<number> = (() => u16) as never;
-factory(
-    s16,
+export const s16: NumberField<number> = factory(
     2,
     (value, { buffer, index, littleEndian }) => {
         setInt16(buffer, index, value, littleEndian);
@@ -85,9 +78,7 @@ factory(
     }),
 );
 
-export const u32: NumberField<number> = (() => u32) as never;
-factory(
-    u32,
+export const u32: NumberField<number> = factory(
     4,
     (value, { buffer, index, littleEndian }) => {
         setUint32(buffer, index, value, littleEndian);
@@ -98,9 +89,7 @@ factory(
     }),
 );
 
-export const s32: NumberField<number> = (() => s32) as never;
-factory(
-    s32,
+export const s32: NumberField<number> = factory(
     4,
     (value, { buffer, index, littleEndian }) => {
         setInt32(buffer, index, value, littleEndian);
@@ -111,9 +100,7 @@ factory(
     }),
 );
 
-export const u64: NumberField<bigint> = (() => u64) as never;
-factory(
-    u64,
+export const u64: NumberField<bigint> = factory(
     8,
     (value, { buffer, index, littleEndian }) => {
         setUint64(buffer, index, value, littleEndian);
@@ -124,9 +111,7 @@ factory(
     }),
 );
 
-export const s64: NumberField<bigint> = (() => u64) as never;
-factory(
-    s64,
+export const s64: NumberField<bigint> = factory(
     8,
     (value, { buffer, index, littleEndian }) => {
         setInt64(buffer, index, value, littleEndian);
diff --git a/toolchain/side-effect-test/package.json b/toolchain/side-effect-test/package.json
index 1122f284..b307028c 100644
--- a/toolchain/side-effect-test/package.json
+++ b/toolchain/side-effect-test/package.json
@@ -5,7 +5,7 @@
     "description": "",
     "main": "index.js",
     "scripts": {
-        "start": "rollup -c rollup.config.ts --configPlugin @rollup/plugin-typescript"
+        "start": "rollup -c rollup.config.ts --configPlugin @rollup/plugin-typescript --watch"
     },
     "keywords": [],
     "author": "",
diff --git a/toolchain/side-effect-test/rollup.config.ts b/toolchain/side-effect-test/rollup.config.ts
index 429e2e29..8bd1be31 100644
--- a/toolchain/side-effect-test/rollup.config.ts
+++ b/toolchain/side-effect-test/rollup.config.ts
@@ -1,5 +1,4 @@
 import node from "@rollup/plugin-node-resolve";
-import terser from "@rollup/plugin-terser";
 import typescript from "@rollup/plugin-typescript";
 import { defineConfig } from "rollup";
 
@@ -14,11 +13,11 @@ export default defineConfig({
     plugins: [
         typescript(),
         node(),
-        terser({
-            module: true,
-            format: {
-                beautify: true,
-            },
-        }),
+        // terser({
+        //     module: true,
+        //     format: {
+        //         beautify: true,
+        //     },
+        // }),
     ],
 });