diff --git a/cli/index.js b/cli/index.js
index 91634a8c01..dca2797988 100644
--- a/cli/index.js
+++ b/cli/index.js
@@ -716,6 +716,12 @@ export async function main(argv, options) {
     }
     stats.initializeTime += stats.end(begin);
   }
+  let numErrors = checkDiagnostics(program, stderr, opts.disableWarning, options.reportDiagnostic, stderrColors.enabled);
+  if (numErrors) {
+    const err = Error(`${numErrors} initialize error(s)`);
+    err.stack = err.message; // omit stack
+    return prepareResult(err);
+  }
 
   // Call afterInitialize transform hook
   {
@@ -740,7 +746,7 @@ export async function main(argv, options) {
       ? assemblyscript.getBinaryenModuleRef(module)
       : module.ref
   );
-  let numErrors = checkDiagnostics(program, stderr, opts.disableWarning, options.reportDiagnostic, stderrColors.enabled);
+  numErrors = checkDiagnostics(program, stderr, opts.disableWarning, options.reportDiagnostic, stderrColors.enabled);
   if (numErrors) {
     const err = Error(`${numErrors} compile error(s)`);
     err.stack = err.message; // omit stack
diff --git a/tests/compiler/covariance.json b/tests/compiler/covariance.json
new file mode 100644
index 0000000000..5b2153a640
--- /dev/null
+++ b/tests/compiler/covariance.json
@@ -0,0 +1,7 @@
+{
+  "stderr": [
+    "TS2394: This overload signature is not compatible with its implementation signature.",
+    "sibling: Cat | null;",
+    "sibling: Animal | null;"
+  ]
+}
\ No newline at end of file
diff --git a/tests/compiler/covariance.ts b/tests/compiler/covariance.ts
new file mode 100644
index 0000000000..4cb3d4c035
--- /dev/null
+++ b/tests/compiler/covariance.ts
@@ -0,0 +1,9 @@
+class Animal {
+  sibling: Animal | null;
+}
+
+class Cat extends Animal {
+  sibling: Cat | null; // covariance is unsound
+}
+
+new Cat();
\ No newline at end of file
diff --git a/tests/compiler/duplicate-field-errors.json b/tests/compiler/duplicate-field-errors.json
index dd6ed9a032..70a641dde0 100644
--- a/tests/compiler/duplicate-field-errors.json
+++ b/tests/compiler/duplicate-field-errors.json
@@ -3,13 +3,7 @@
   ],
   "stderr": [
     "TS2385: Overload signatures must all be public, private or protected.", "public privPub: i32;", "private privPub: i32;",
-    "TS2442: Types have separate declarations of a private property 'privPriv'.",
-    "TS2325: Property 'privProt' is private in type 'duplicate-field-errors/A' but not in type 'duplicate-field-errors/B'.",
-    "TS2325: Property 'privPub' is private in type 'duplicate-field-errors/A' but not in type 'duplicate-field-errors/B'.",
-    "TS2325: Property 'protPriv' is private in type 'duplicate-field-errors/B' but not in type 'duplicate-field-errors/A'.",
-    "TS2325: Property 'pubPriv' is private in type 'duplicate-field-errors/B' but not in type 'duplicate-field-errors/A'.",
-    "TS2444: Property 'pubProt' is protected in type 'duplicate-field-errors/B' but public in type 'duplicate-field-errors/A'.",
-    "TS2394: This overload signature is not compatible with its implementation signature.", "public method: i32;", "method(): void",
-    "TS2394: This overload signature is not compatible with its implementation signature.", "sibling: Cat | null;", "sibling: Animal | null;"
+    "TS2385: Overload signatures must all be public, private or protected.", "protected pubProt: i32;", "public pubProt: i32;",
+    "TS2416: Property 'method' in type 'duplicate-field-errors/B' is not assignable to the same property in base type 'duplicate-field-errors/A'."
   ]
 }
diff --git a/tests/compiler/duplicate-field-errors.ts b/tests/compiler/duplicate-field-errors.ts
index dd5bc58cac..61979a4166 100644
--- a/tests/compiler/duplicate-field-errors.ts
+++ b/tests/compiler/duplicate-field-errors.ts
@@ -36,15 +36,7 @@ class B extends A {
   public method: i32;
 }
 
-class Animal {
-  sibling: Animal | null;
-}
-class Cat extends Animal {
-  sibling: Cat | null; // covariance is unsound
-}
-
 export function test(): void {
   new A();
   new B();
-  new Cat();
 }
diff --git a/tests/compiler/duplicate-identifier-function.json b/tests/compiler/duplicate-identifier-function.json
new file mode 100644
index 0000000000..e87c11ab87
--- /dev/null
+++ b/tests/compiler/duplicate-identifier-function.json
@@ -0,0 +1,7 @@
+{
+  "stderr": [
+    "TS2300: Duplicate identifier 'e'", "var e: f32", "var e: i32",
+    "TS2300: Duplicate identifier 'f'", "let f: f32",
+    "EOF"
+  ]
+}
\ No newline at end of file
diff --git a/tests/compiler/duplicate-identifier-function.ts b/tests/compiler/duplicate-identifier-function.ts
new file mode 100644
index 0000000000..22f201a56a
--- /dev/null
+++ b/tests/compiler/duplicate-identifier-function.ts
@@ -0,0 +1,12 @@
+function baz(): void {
+  var e: i32;
+  var e: f32;
+  {
+    let f: i32;
+    let f: f32;
+  }
+}
+
+baz();
+
+ERROR("EOF"); // mark end and ensure fail
diff --git a/tests/compiler/duplicate-identifier.json b/tests/compiler/duplicate-identifier.json
index a3f82cc818..a19a424726 100644
--- a/tests/compiler/duplicate-identifier.json
+++ b/tests/compiler/duplicate-identifier.json
@@ -5,9 +5,6 @@
     "TS2300: Duplicate identifier 'a'", "var a: f32", "var a: i32",
     "TS2300: Duplicate identifier 'b'", "b: f32", "b: i32",
     "TS2300: Duplicate identifier 'c'", "static c: f32", " static c: i32",
-    "TS2300: Duplicate identifier 'd'", "const d: f32", "const d: i32",
-    "TS2300: Duplicate identifier 'e'", "var e: f32", "var e: i32",
-    "TS2300: Duplicate identifier 'f'", "let f: f32",
-    "EOF"
+    "TS2300: Duplicate identifier 'd'", "const d: f32", "const d: i32"
   ]
 }
diff --git a/tests/compiler/duplicate-identifier.ts b/tests/compiler/duplicate-identifier.ts
index b9482e8369..aac76606be 100644
--- a/tests/compiler/duplicate-identifier.ts
+++ b/tests/compiler/duplicate-identifier.ts
@@ -12,16 +12,3 @@ namespace Bar {
   const d: i32 = 0;
   const d: f32 = 1;
 }
-
-function baz(): void {
-  var e: i32;
-  var e: f32;
-  {
-    let f: i32;
-    let f: f32;
-  }
-}
-
-baz();
-
-ERROR("EOF"); // mark end and ensure fail
diff --git a/tests/compiler/unmanaged-errors.json b/tests/compiler/unmanaged-errors.json
index a636c438c9..022ef729a6 100644
--- a/tests/compiler/unmanaged-errors.json
+++ b/tests/compiler/unmanaged-errors.json
@@ -3,7 +3,6 @@
   ],
   "stderr": [
     "AS207: Unmanaged classes cannot extend managed classes and vice-versa.", "UnmanagedFoo extends ManagedBase",
-    "AS207: Unmanaged classes cannot extend managed classes and vice-versa.", "ManagedFoo extends UnmanagedBase",
-    "EOF"
+    "AS207: Unmanaged classes cannot extend managed classes and vice-versa.", "ManagedFoo extends UnmanagedBase"
   ]
 }
diff --git a/tests/compiler/unmanaged-errors.ts b/tests/compiler/unmanaged-errors.ts
index 2e73894bb7..89f521c565 100644
--- a/tests/compiler/unmanaged-errors.ts
+++ b/tests/compiler/unmanaged-errors.ts
@@ -8,5 +8,3 @@ class ManagedBaz {}
 class ManagedFoo extends UnmanagedBase { // AS207
   constructor(public baz: ManagedBaz) { super(); }
 }
-
-ERROR("EOF");
diff --git a/tests/compiler/unsafe-not-valid.json b/tests/compiler/unsafe-not-valid.json
new file mode 100644
index 0000000000..b924c19455
--- /dev/null
+++ b/tests/compiler/unsafe-not-valid.json
@@ -0,0 +1,5 @@
+{
+  "stderr": [
+    "AS212: Decorator '@unsafe' is not valid here."
+  ]
+}
\ No newline at end of file
diff --git a/tests/compiler/unsafe-not-valid.ts b/tests/compiler/unsafe-not-valid.ts
new file mode 100644
index 0000000000..26a82a7c82
--- /dev/null
+++ b/tests/compiler/unsafe-not-valid.ts
@@ -0,0 +1,3 @@
+// Global
+
+@unsafe var g = 0; // not valid here
\ No newline at end of file
diff --git a/tests/compiler/unsafe.json b/tests/compiler/unsafe.json
index f44bd65446..319dd27cf2 100644
--- a/tests/compiler/unsafe.json
+++ b/tests/compiler/unsafe.json
@@ -3,7 +3,6 @@
     "--noUnsafe"
   ],
   "stderr": [
-    "AS212: Decorator '@unsafe' is not valid here.",
     "AS101: Operation is unsafe.", "f1();",
     "AS101: Operation is unsafe.", "f2();",
     "AS101: Operation is unsafe.", "= new Foo();",
diff --git a/tests/compiler/unsafe.ts b/tests/compiler/unsafe.ts
index 29d1bc7353..16efa287ea 100644
--- a/tests/compiler/unsafe.ts
+++ b/tests/compiler/unsafe.ts
@@ -1,7 +1,3 @@
-// Global
-
-@unsafe var g = 0; // not valid here
-
 // Function
 
 @unsafe function f1(): void {}