From 347dd8f5344b860fb883fb0fc38607a44ccadb61 Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cdo@wip.sh>
Date: Sat, 14 Mar 2026 18:36:21 +0000
Subject: [PATCH] Make all sections optional

---
 asm.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/asm.js b/asm.js
index a59e16c..103f493 100644
--- a/asm.js
+++ b/asm.js
@@ -884,6 +884,7 @@ export class Assembler {
 
     wasm_section_type() {
         const funcs = Object.values(this.funcs);
+        if (funcs.length == 0) return null;
         const contents = funcs.map(({ params, results }) => {
             const param_types = Object.values(params);
             return [
@@ -917,6 +918,7 @@ export class Assembler {
 
     wasm_section_func() {
         const func_count = Object.entries(this.funcs).length;
+        if (func_count == 0) return null;
         return [ func_count, ...Array(func_count).keys() ];
     }
 
@@ -940,6 +942,7 @@ export class Assembler {
 
     wasm_section_export() {
         const exports = Object.entries(this.exports);
+        if (exports.length == 0) return null;
         const contents = exports.map(([ name, { kind, index }]) => {
             const name_utf8 = this.encoder.encode(name);
             return [
@@ -954,6 +957,7 @@ export class Assembler {
 
     wasm_section_code() {
         const funcs = Object.values(this.funcs);
+        if (funcs.length == 0) return null;
         const contents = funcs.map(({ body, locals }) => {
             const local_types = Object.values(locals);
             const local_count = local_types.length;