diff --git a/src/errors/APIError.ts b/src/errors/APIError.ts
index b889d164ba..dca496770f 100644
--- a/src/errors/APIError.ts
+++ b/src/errors/APIError.ts
@@ -5,6 +5,14 @@ import httpStatus from 'http-status';
  * @extends Error
  */
 class ExtendableError extends Error {
+  status: number;
+
+  data: any;
+
+  isPublic: boolean;
+
+  isOperational: boolean;
+
   constructor(message: string, status: number, data: any, isPublic: boolean) {
     super(message);
     this.name = this.constructor.name;
@@ -13,6 +21,8 @@ class ExtendableError extends Error {
     this.data = data;
     this.isPublic = isPublic;
     this.isOperational = true; // This is required since bluebird 4 doesn't append it anymore.
+    // eslint-disable-next-line @typescript-eslint/ban-ts-comment
+    // @ts-ignore Couldn't get the compiler to love me
     Error.captureStackTrace(this, this.constructor.name);
   }
 }
diff --git a/src/errors/DuplicateCollection.ts b/src/errors/DuplicateCollection.ts
index f13ce750de..5c0f43e854 100644
--- a/src/errors/DuplicateCollection.ts
+++ b/src/errors/DuplicateCollection.ts
@@ -1,7 +1,7 @@
 import APIError from './APIError';
 
 class DuplicateCollection extends APIError {
-  constructor(propertyName, duplicates) {
+  constructor(propertyName: string, duplicates: string[]) {
     super(`Collection ${propertyName} already in use: "${duplicates.join(', ')}"`);
   }
 }
diff --git a/src/errors/DuplicateGlobal.ts b/src/errors/DuplicateGlobal.ts
index f33aee7dbf..baaae40019 100644
--- a/src/errors/DuplicateGlobal.ts
+++ b/src/errors/DuplicateGlobal.ts
@@ -1,7 +1,8 @@
+import { Global } from '../globals/config/types';
 import APIError from './APIError';
 
 class DuplicateGlobal extends APIError {
-  constructor(config) {
+  constructor(config: Global) {
     super(`Global label "${config.label}" is already in use`);
   }
 }
diff --git a/src/errors/InvalidConfiguration.ts b/src/errors/InvalidConfiguration.ts
index f2b85277df..1ceff282cb 100644
--- a/src/errors/InvalidConfiguration.ts
+++ b/src/errors/InvalidConfiguration.ts
@@ -2,7 +2,7 @@ import httpStatus from 'http-status';
 import APIError from './APIError';
 
 class InvalidConfiguration extends APIError {
-  constructor(message, results?) {
+  constructor(message: string, results: any) {
     super(message, httpStatus.INTERNAL_SERVER_ERROR, results);
   }
 }
diff --git a/src/errors/InvalidSchema.ts b/src/errors/InvalidSchema.ts
index e9328ec9f8..a17063bd33 100644
--- a/src/errors/InvalidSchema.ts
+++ b/src/errors/InvalidSchema.ts
@@ -2,7 +2,7 @@ import httpStatus from 'http-status';
 import APIError from './APIError';
 
 class InvalidSchema extends APIError {
-  constructor(message, results) {
+  constructor(message: string, results: any) {
     super(message, httpStatus.INTERNAL_SERVER_ERROR, results);
   }
 }
diff --git a/src/errors/MissingFieldInputOptions.ts b/src/errors/MissingFieldInputOptions.ts
index ec22f55a0a..f28473b4a0 100644
--- a/src/errors/MissingFieldInputOptions.ts
+++ b/src/errors/MissingFieldInputOptions.ts
@@ -1,7 +1,8 @@
+import { Field } from '../fields/config/types';
 import APIError from './APIError';
 
 class MissingFieldInputOptions extends APIError {
-  constructor(field) {
+  constructor(field: Field) {
     super(`Field ${field.label} is missing options.`);
   }
 }
diff --git a/src/errors/MissingFieldType.ts b/src/errors/MissingFieldType.ts
index 5593faae6c..ee6c7b2faa 100644
--- a/src/errors/MissingFieldType.ts
+++ b/src/errors/MissingFieldType.ts
@@ -1,7 +1,8 @@
+import { Field } from '../fields/config/types';
 import APIError from './APIError';
 
 class MissingFieldType extends APIError {
-  constructor(field) {
+  constructor(field: Field) {
     super(`Field "${field.name}" is either missing a field type or it does not match an available field type`);
   }
 }
diff --git a/src/errors/MissingGlobalLabel.ts b/src/errors/MissingGlobalLabel.ts
index 12836cbdf4..1e0603e23b 100644
--- a/src/errors/MissingGlobalLabel.ts
+++ b/src/errors/MissingGlobalLabel.ts
@@ -1,7 +1,8 @@
+import { Config } from '../config/types';
 import APIError from './APIError';
 
 class MissingGlobalLabel extends APIError {
-  constructor(config) {
+  constructor(config: Config) {
     super(`${config.globals} object is missing label`);
   }
 }
diff --git a/src/errors/ValidationError.ts b/src/errors/ValidationError.ts
index 3c16173c05..3977decf11 100644
--- a/src/errors/ValidationError.ts
+++ b/src/errors/ValidationError.ts
@@ -2,7 +2,7 @@ import httpStatus from 'http-status';
 import APIError from './APIError';
 
 class ValidationError extends APIError {
-  constructor(results) {
+  constructor(results: any[]) {
     super(`Bad request with ${results.length} errors`, httpStatus.BAD_REQUEST, results);
   }
 }