diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 000000000..1c2f0d31e
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,33 @@
+# How to Contribute to Wasmer
+
+Thank you for your interest in contributing to Wasmer. This document outlines some recommendations on how to contribute.
+
+## Issues & Feature Requests
+Please use the issue template and provide a failing example if possible to help us recreate the issue.
+
+## Pull Requests
+For large changes, please try reaching the Wasmer using Github Issues or Spectrum Chat to ensure we can accept the change once it is ready.  
+
+We recommend trying the following commands before sending a pull request to ensure code quality:
+- `cargo fmt --all` Ensures all code is correctly formatted.
+- Run `cargo test` in the crates that you are modifying.
+- Run `cargo build --all` (nightly) or `cargo build --all --exclude wasmer-singlepass-backend`
+
+A comprehensive CI test suite will be run by a Wasmer team member after the PR has been created.
+
+### Common Build Issues
+
+**LLVM Dependency**
+
+The LLVM backend requires LLVM to be installed to compile.
+
+So, you may run into the following error:
+```
+Didn't find usable system-wide LLVM.
+No suitable version of LLVM was found system-wide or pointed
+```
+
+**Singlepass Nightly Only**
+
+The singlepass crate depends on nightly so you may need to add the `+nightly` cargo flag to compile this crate.
+`error[E0554]: #![feature] may not be used on the stable release channel`
diff --git a/lib/clif-backend/src/lib.rs b/lib/clif-backend/src/lib.rs
index cdaae7688..eed22d39e 100644
--- a/lib/clif-backend/src/lib.rs
+++ b/lib/clif-backend/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/lib/emscripten-tests/tests/emtests/_common.rs b/lib/emscripten-tests/tests/emtests/_common.rs
index 8e4a70534..1e5dfba6e 100644
--- a/lib/emscripten-tests/tests/emtests/_common.rs
+++ b/lib/emscripten-tests/tests/emtests/_common.rs
@@ -42,7 +42,7 @@ macro_rules! assert_emscripten_output {
 
 //        let module = compile(&wasm_bytes[..])
 //            .map_err(|err| format!("Can't create the WebAssembly module: {}", err)).unwrap(); // NOTE: Need to figure what the unwrap is for ??
-        let mut emscripten_globals = EmscriptenGlobals::new(&module);
+        let mut emscripten_globals = EmscriptenGlobals::new(&module).expect("globals are valid");
         let import_object = generate_emscripten_env(&mut emscripten_globals);
 
         let mut instance = module.instantiate(&import_object)
diff --git a/lib/emscripten/src/lib.rs b/lib/emscripten/src/lib.rs
index d2ddc03d6..2f03dbb3b 100644
--- a/lib/emscripten/src/lib.rs
+++ b/lib/emscripten/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
@@ -14,7 +16,7 @@ use std::collections::HashMap;
 use std::path::PathBuf;
 use std::{f64, ffi::c_void};
 use wasmer_runtime_core::{
-    error::CallResult,
+    error::{CallError, CallResult, ResolveError},
     export::Export,
     func,
     global::Global,
@@ -371,10 +373,11 @@ pub fn run_emscripten_instance(
             0 => {
                 instance.call(func_name, &[])?;
             }
-            _ => panic!(
-                "The emscripten main function has received an incorrect number of params {}",
-                num_params
-            ),
+            _ => {
+                return Err(CallError::Resolve(ResolveError::ExportWrongType {
+                    name: "main".to_string(),
+                }))
+            }
         };
     }
 
@@ -434,7 +437,7 @@ pub struct EmscriptenGlobals {
 }
 
 impl EmscriptenGlobals {
-    pub fn new(module: &Module /*, static_bump: u32 */) -> Self {
+    pub fn new(module: &Module /*, static_bump: u32 */) -> Result<Self, String> {
         let mut use_old_abort_on_cannot_grow_memory = false;
         for (
             index,
@@ -456,8 +459,8 @@ impl EmscriptenGlobals {
             }
         }
 
-        let (table_min, table_max) = get_emscripten_table_size(&module);
-        let (memory_min, memory_max, shared) = get_emscripten_memory_size(&module);
+        let (table_min, table_max) = get_emscripten_table_size(&module)?;
+        let (memory_min, memory_max, shared) = get_emscripten_memory_size(&module)?;
 
         // Memory initialization
         let memory_type = MemoryDescriptor {
@@ -528,14 +531,14 @@ impl EmscriptenGlobals {
             }
         }
 
-        Self {
+        Ok(Self {
             data,
             memory,
             table,
             memory_min,
             memory_max,
             null_func_names,
-        }
+        })
     }
 }
 
diff --git a/lib/emscripten/src/utils.rs b/lib/emscripten/src/utils.rs
index 37d3ae870..246cd1686 100644
--- a/lib/emscripten/src/utils.rs
+++ b/lib/emscripten/src/utils.rs
@@ -33,22 +33,20 @@ pub fn is_emscripten_module(module: &Module) -> bool {
     false
 }
 
-pub fn get_emscripten_table_size(module: &Module) -> (u32, Option<u32>) {
-    assert!(
-        module.info().imported_tables.len() > 0,
-        "Emscripten requires at least one imported table"
-    );
+pub fn get_emscripten_table_size(module: &Module) -> Result<(u32, Option<u32>), String> {
+    if module.info().imported_tables.len() == 0 {
+        return Err("Emscripten requires at least one imported table".to_string());
+    }
     let (_, table) = &module.info().imported_tables[ImportedTableIndex::new(0)];
-    (table.minimum, table.maximum)
+    Ok((table.minimum, table.maximum))
 }
 
-pub fn get_emscripten_memory_size(module: &Module) -> (Pages, Option<Pages>, bool) {
-    assert!(
-        module.info().imported_tables.len() > 0,
-        "Emscripten requires at least one imported memory"
-    );
+pub fn get_emscripten_memory_size(module: &Module) -> Result<(Pages, Option<Pages>, bool), String> {
+    if module.info().imported_memories.len() == 0 {
+        return Err("Emscripten requires at least one imported memory".to_string());
+    }
     let (_, memory) = &module.info().imported_memories[ImportedMemoryIndex::new(0)];
-    (memory.minimum, memory.maximum, memory.shared)
+    Ok((memory.minimum, memory.maximum, memory.shared))
 }
 
 /// Reads values written by `-s EMIT_EMSCRIPTEN_METADATA=1`
diff --git a/lib/llvm-backend/src/lib.rs b/lib/llvm-backend/src/lib.rs
index 251296e44..454fad100 100644
--- a/lib/llvm-backend/src/lib.rs
+++ b/lib/llvm-backend/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/lib/middleware-common/src/lib.rs b/lib/middleware-common/src/lib.rs
index c833273de..929558f25 100644
--- a/lib/middleware-common/src/lib.rs
+++ b/lib/middleware-common/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/lib/runtime-core/src/lib.rs b/lib/runtime-core/src/lib.rs
index 27572ee83..c12db47d9 100644
--- a/lib/runtime-core/src/lib.rs
+++ b/lib/runtime-core/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/lib/runtime/src/lib.rs b/lib/runtime/src/lib.rs
index d106e1708..78c6235c8 100644
--- a/lib/runtime/src/lib.rs
+++ b/lib/runtime/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/lib/singlepass-backend/src/lib.rs b/lib/singlepass-backend/src/lib.rs
index 70eac299b..e749e5a22 100644
--- a/lib/singlepass-backend/src/lib.rs
+++ b/lib/singlepass-backend/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/lib/wasi/src/lib.rs b/lib/wasi/src/lib.rs
index 77eb53d12..ac9b11a86 100644
--- a/lib/wasi/src/lib.rs
+++ b/lib/wasi/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/lib/win-exception-handler/src/lib.rs b/lib/win-exception-handler/src/lib.rs
index f2561fda0..cf5e8396f 100644
--- a/lib/win-exception-handler/src/lib.rs
+++ b/lib/win-exception-handler/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/src/bin/kwasmd.rs b/src/bin/kwasmd.rs
index fc67b6a60..62e22b731 100644
--- a/src/bin/kwasmd.rs
+++ b/src/bin/kwasmd.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
diff --git a/src/bin/wasmer.rs b/src/bin/wasmer.rs
index 705e38812..be0939e43 100644
--- a/src/bin/wasmer.rs
+++ b/src/bin/wasmer.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns
@@ -542,7 +544,7 @@ fn execute_wasm(options: &Run) -> Result<(), String> {
 
     // TODO: refactor this
     if wasmer_emscripten::is_emscripten_module(&module) {
-        let mut emscripten_globals = wasmer_emscripten::EmscriptenGlobals::new(&module);
+        let mut emscripten_globals = wasmer_emscripten::EmscriptenGlobals::new(&module)?;
         let import_object = wasmer_emscripten::generate_emscripten_env(&mut emscripten_globals);
         let mut instance = module
             .instantiate(&import_object)
diff --git a/src/lib.rs b/src/lib.rs
index 43534b78c..3d0b047ea 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,8 @@
 #![deny(
     dead_code,
+    nonstandard_style,
     unused_imports,
+    unused_mut,
     unused_variables,
     unused_unsafe,
     unreachable_patterns