diff --git a/dist/utils.d.ts b/dist/utils.d.ts
index c091007..c17cb2c 100644
--- a/dist/utils.d.ts
+++ b/dist/utils.d.ts
@@ -14,7 +14,11 @@ interface DescriptorWithOwner extends PropertyDescriptor {
 export declare function getInheritedDescriptor<T extends object>(obj: T, key: keyof T): DescriptorWithOwner | undefined;
 export declare function getInheritedPropertyNames<T extends object>(obj: T): (keyof T)[];
 export type Constructor<T = object, A extends any[] = any[], Static = {}> = (new (...a: A) => T) & Static;
-export declare function Constructor<T = object, Static = {}>(Ctor: Constructor<any>): Constructor<T> & Static;
+export declare function Constructor<T = object, Static = {}>(Ctor: AnyConstructor<any>): Constructor<T> & Static;
+export type AbstractConstructor<T = object, A extends any[] = any[], Static = {}> = (abstract new (...a: A) => T) & Static;
+export declare function AbstractConstructor<T = object, Static = {}>(Ctor: AnyConstructor<any>): AbstractConstructor<T> & Static;
+export type AnyConstructor<T = object, A extends any[] = any[], Static = {}> = Constructor<T, A, Static> | AbstractConstructor<T, A, Static>;
+export declare function AnyConstructor<T = object, Static = {}>(Ctor: AnyConstructor<any>): AnyConstructor<T> & Static;
 export declare function hasPrototype(obj: any, proto: any): boolean;
 export declare function copyDescriptors(source: Object, destination: Object, mod?: any): void;
 export declare function setDefaultPrototypeDescriptors(prototype: Object, { defaultClassDescriptor: { writable, enumerable, configurable } }: any): void;
diff --git a/dist/utils.d.ts.map b/dist/utils.d.ts.map
index e058798..e4f7650 100644
--- a/dist/utils.d.ts.map
+++ b/dist/utils.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"utils.d.ts","sourceRoot":"","sources":["../src/utils.ts"],"names":[],"mappings":"AAEA,qBAAa,aAAa;IACzB,CAAC,wBAAgB;IACjB,GAAG,CAAC,CAAC,EAAE,MAAM,EAAE,CAAC,EAAE,MAAM;IAIxB,GAAG,CAAC,IAAI,EAAE,MAAM;IAGhB,GAAG,CAAC,IAAI,EAAE,MAAM;CAGhB;AAGD,wBAAgB,eAAe,CAAC,EAAE,EAAE,QAAQ,GAAG,MAAM,CAKpD;AAQD,wBAAgB,aAAa,CAAC,CAAC,SAAS,EAAE,EACzC,GAAG,EAAE,CAAC,EACN,GAAG,EAAE,MAAM,CAAC,EACZ,aAAa,EAAE,kBAAkB,EACjC,SAAS,UAAQ,GACf,IAAI,CAKN;AAED,wBAAgB,cAAc,CAAC,GAAG,EAAE,MAAM,EAAE,cAAc,EAAE,MAAM,CAAC,MAAM,EAAE,kBAAkB,CAAC,GAAG,IAAI,CAYpG;AA2BD,wBAAgB,kBAAkB,CAAC,CAAC,SAAS,MAAM,GAAG,kBAAkB,EACvE,GAAG,EAAE,CAAC,EACN,GAAG,CAAC,EAAE,MAAM,CAAC,EACb,SAAS,UAAO,GACd,OAAO,CAaT;AAED,UAAU,mBAAoB,SAAQ,kBAAkB;IACvD,KAAK,EAAE,MAAM,CAAA;CACb;AAED,wBAAgB,sBAAsB,CAAC,CAAC,SAAS,MAAM,EAAE,GAAG,EAAE,CAAC,EAAE,GAAG,EAAE,MAAM,CAAC,GAAG,mBAAmB,GAAG,SAAS,CAgB9G;AAED,wBAAgB,yBAAyB,CAAC,CAAC,SAAS,MAAM,EAAE,GAAG,EAAE,CAAC,GAAG,CAAC,MAAM,CAAC,CAAC,EAAE,CAa/E;AAED,MAAM,MAAM,WAAW,CAAC,CAAC,GAAG,MAAM,EAAE,CAAC,SAAS,GAAG,EAAE,GAAG,GAAG,EAAE,EAAE,MAAM,GAAG,EAAE,IAAI,CAAC,KAAK,GAAG,CAAC,EAAE,CAAC,KAAK,CAAC,CAAC,GAAG,MAAM,CAAA;AAGzG,wBAAgB,WAAW,CAAC,CAAC,GAAG,MAAM,EAAE,MAAM,GAAG,EAAE,EAAE,IAAI,EAAE,WAAW,CAAC,GAAG,CAAC,GAAG,WAAW,CAAC,CAAC,CAAC,GAAG,MAAM,CAEpG;AAGD,wBAAgB,YAAY,CAAC,GAAG,EAAE,GAAG,EAAE,KAAK,EAAE,GAAG,WAShD;AAGD,wBAAgB,eAAe,CAAC,MAAM,EAAE,MAAM,EAAE,WAAW,EAAE,MAAM,EAAE,GAAG,CAAC,EAAE,GAAG,QAS7E;AAED,wBAAgB,8BAA8B,CAC7C,SAAS,EAAE,MAAM,EACjB,EAAC,sBAAsB,EAAE,EAAC,QAAQ,EAAE,UAAU,EAAE,YAAY,EAAC,EAAC,EAAE,GAAG,QAmBnE;AAED,wBAAgB,2BAA2B,CAC1C,IAAI,EAAE,GAAG,EACT,EAAC,sBAAsB,EAAE,EAAC,QAAQ,EAAE,UAAU,EAAE,YAAY,EAAC,EAAC,EAAE,GAAG,EACnE,eAAe,CAAC,EAAE,CAAC,MAAM,GAAG,MAAM,CAAC,EAAE,QAwBrC"}
\ No newline at end of file
+{"version":3,"file":"utils.d.ts","sourceRoot":"","sources":["../src/utils.ts"],"names":[],"mappings":"AAEA,qBAAa,aAAa;IACzB,CAAC,wBAAgB;IACjB,GAAG,CAAC,CAAC,EAAE,MAAM,EAAE,CAAC,EAAE,MAAM;IAIxB,GAAG,CAAC,IAAI,EAAE,MAAM;IAGhB,GAAG,CAAC,IAAI,EAAE,MAAM;CAGhB;AAGD,wBAAgB,eAAe,CAAC,EAAE,EAAE,QAAQ,GAAG,MAAM,CAKpD;AAQD,wBAAgB,aAAa,CAAC,CAAC,SAAS,EAAE,EACzC,GAAG,EAAE,CAAC,EACN,GAAG,EAAE,MAAM,CAAC,EACZ,aAAa,EAAE,kBAAkB,EACjC,SAAS,UAAQ,GACf,IAAI,CAKN;AAED,wBAAgB,cAAc,CAAC,GAAG,EAAE,MAAM,EAAE,cAAc,EAAE,MAAM,CAAC,MAAM,EAAE,kBAAkB,CAAC,GAAG,IAAI,CAYpG;AA2BD,wBAAgB,kBAAkB,CAAC,CAAC,SAAS,MAAM,GAAG,kBAAkB,EACvE,GAAG,EAAE,CAAC,EACN,GAAG,CAAC,EAAE,MAAM,CAAC,EACb,SAAS,UAAO,GACd,OAAO,CAaT;AAED,UAAU,mBAAoB,SAAQ,kBAAkB;IACvD,KAAK,EAAE,MAAM,CAAA;CACb;AAED,wBAAgB,sBAAsB,CAAC,CAAC,SAAS,MAAM,EAAE,GAAG,EAAE,CAAC,EAAE,GAAG,EAAE,MAAM,CAAC,GAAG,mBAAmB,GAAG,SAAS,CAgB9G;AAED,wBAAgB,yBAAyB,CAAC,CAAC,SAAS,MAAM,EAAE,GAAG,EAAE,CAAC,GAAG,CAAC,MAAM,CAAC,CAAC,EAAE,CAa/E;AAWD,MAAM,MAAM,WAAW,CAAC,CAAC,GAAG,MAAM,EAAE,CAAC,SAAS,GAAG,EAAE,GAAG,GAAG,EAAE,EAAE,MAAM,GAAG,EAAE,IAAI,CAAC,KAAK,GAAG,CAAC,EAAE,CAAC,KAAK,CAAC,CAAC,GAAG,MAAM,CAAA;AAQzG,wBAAgB,WAAW,CAAC,CAAC,GAAG,MAAM,EAAE,MAAM,GAAG,EAAE,EAAE,IAAI,EAAE,cAAc,CAAC,GAAG,CAAC,GAAG,WAAW,CAAC,CAAC,CAAC,GAAG,MAAM,CAEvG;AAWD,MAAM,MAAM,mBAAmB,CAAC,CAAC,GAAG,MAAM,EAAE,CAAC,SAAS,GAAG,EAAE,GAAG,GAAG,EAAE,EAAE,MAAM,GAAG,EAAE,IAAI,CAAC,QAAQ,MAAM,GAAG,CAAC,EAAE,CAAC,KAAK,CAAC,CAAC,GAChH,MAAM,CAAA;AAQP,wBAAgB,mBAAmB,CAAC,CAAC,GAAG,MAAM,EAAE,MAAM,GAAG,EAAE,EAC1D,IAAI,EAAE,cAAc,CAAC,GAAG,CAAC,GACvB,mBAAmB,CAAC,CAAC,CAAC,GAAG,MAAM,CAEjC;AAcD,MAAM,MAAM,cAAc,CAAC,CAAC,GAAG,MAAM,EAAE,CAAC,SAAS,GAAG,EAAE,GAAG,GAAG,EAAE,EAAE,MAAM,GAAG,EAAE,IACxE,WAAW,CAAC,CAAC,EAAE,CAAC,EAAE,MAAM,CAAC,GACzB,mBAAmB,CAAC,CAAC,EAAE,CAAC,EAAE,MAAM,CAAC,CAAA;AAQpC,wBAAgB,cAAc,CAAC,CAAC,GAAG,MAAM,EAAE,MAAM,GAAG,EAAE,EAAE,IAAI,EAAE,cAAc,CAAC,GAAG,CAAC,GAAG,cAAc,CAAC,CAAC,CAAC,GAAG,MAAM,CAE7G;AAGD,wBAAgB,YAAY,CAAC,GAAG,EAAE,GAAG,EAAE,KAAK,EAAE,GAAG,WAShD;AAGD,wBAAgB,eAAe,CAAC,MAAM,EAAE,MAAM,EAAE,WAAW,EAAE,MAAM,EAAE,GAAG,CAAC,EAAE,GAAG,QAS7E;AAED,wBAAgB,8BAA8B,CAC7C,SAAS,EAAE,MAAM,EACjB,EAAC,sBAAsB,EAAE,EAAC,QAAQ,EAAE,UAAU,EAAE,YAAY,EAAC,EAAC,EAAE,GAAG,QAmBnE;AAED,wBAAgB,2BAA2B,CAC1C,IAAI,EAAE,GAAG,EACT,EAAC,sBAAsB,EAAE,EAAC,QAAQ,EAAE,UAAU,EAAE,YAAY,EAAC,EAAC,EAAE,GAAG,EACnE,eAAe,CAAC,EAAE,CAAC,MAAM,GAAG,MAAM,CAAC,EAAE,QAwBrC"}
\ No newline at end of file
diff --git a/dist/utils.js b/dist/utils.js
index f392ae3..3f362ee 100644
--- a/dist/utils.js
+++ b/dist/utils.js
@@ -94,6 +94,12 @@ export function getInheritedPropertyNames(obj) {
 export function Constructor(Ctor) {
     return Ctor;
 }
+export function AbstractConstructor(Ctor) {
+    return Ctor;
+}
+export function AnyConstructor(Ctor) {
+    return Ctor;
+}
 export function hasPrototype(obj, proto) {
     let currentProto = obj.__proto__;
     do {
diff --git a/dist/utils.js.map b/dist/utils.js.map
index d8cd781..192ec0f 100644
--- a/dist/utils.js.map
+++ b/dist/utils.js.map
@@ -1 +1 @@
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\ No newline at end of file
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diff --git a/src/utils.ts b/src/utils.ts
index 02a835b..40eb33f 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -135,13 +135,77 @@ export function getInheritedPropertyNames<T extends object>(obj: T): (keyof T)[]
 	return keys
 }
 
+/**
+ * Without type args, this is an easy shortcut for "any non-abstract constructor
+ * that has any args and returns any type of object".
+ *
+ * With type args, define a non-abstract constructor type that returns a certain
+ * instance type (optional), accepts certain args (optional, defaults to any
+ * args for simplicity in cases like class-factory mixins), and has certain
+ * static members (optional).
+ */
 export type Constructor<T = object, A extends any[] = any[], Static = {}> = (new (...a: A) => T) & Static
 
-// this is used for type casting in special cases, see the declaration file
-export function Constructor<T = object, Static = {}>(Ctor: Constructor<any>): Constructor<T> & Static {
+/**
+ * Cast any constructor type (abstract or not) into a specific Constructor type.
+ * Useful for forcing type checks inside of mixins for example. This is unsafe:
+ * you can incorrectly cast one constructor into an unrelated constructor type,
+ * so use with care.
+ */
+export function Constructor<T = object, Static = {}>(Ctor: AnyConstructor<any>): Constructor<T> & Static {
 	return Ctor as unknown as Constructor<T> & Static
 }
 
+/**
+ * Without type args, this is an easy shortcut for "any abstract constructor
+ * that has any args and returns any type of object".
+ *
+ * With type args, define an abstract constructor type that returns a certain
+ * instance type (optional), accepts certain args (optional, defaults to any
+ * args for simplicity in cases like class-factory mixins), and has certain
+ * static members (optional).
+ */
+export type AbstractConstructor<T = object, A extends any[] = any[], Static = {}> = (abstract new (...a: A) => T) &
+	Static
+
+/**
+ * Cast any constructor type (abstract or not) into a specific
+ * AbstractConstructor type. Useful for forcing type checks inside of mixins
+ * for example. This is unsafe: you can incorrectly cast one constructor into an
+ * unrelated constructor type, so use with care.
+ */
+export function AbstractConstructor<T = object, Static = {}>(
+	Ctor: AnyConstructor<any>,
+): AbstractConstructor<T> & Static {
+	return Ctor as unknown as AbstractConstructor<T> & Static
+}
+
+/**
+ * Combines Constructor and AbstractConstructor to support assigning any type of
+ * constructor whether abstract or not.
+ *
+ * Without type args, this is an easy shortcut for "any constructor, abstract or not,
+ * that has any args and returns any type of object".
+ *
+ * With type args, define a constructor type (abstract or not) that returns a
+ * certain instance type (optional), accepts certain args (optional, defaults to
+ * any args for simplicity in cases like class-factory mixins), and has certain
+ * static members (optional).
+ */
+export type AnyConstructor<T = object, A extends any[] = any[], Static = {}> =
+	| Constructor<T, A, Static>
+	| AbstractConstructor<T, A, Static>
+
+/**
+ * Cast any constructor type (abstract or not) into a specific
+ * AnyConstructor type. Useful for forcing type checks inside of mixins
+ * for example. This is unsafe: you can incorrectly cast one constructor into an
+ * unrelated constructor type, so use with care.
+ */
+export function AnyConstructor<T = object, Static = {}>(Ctor: AnyConstructor<any>): AnyConstructor<T> & Static {
+	return Ctor as unknown as AnyConstructor<T> & Static
+}
+
 // check if an object has the given prototype in its chain
 export function hasPrototype(obj: any, proto: any) {
 	let currentProto = obj.__proto__