diff --git a/js/DerivedProperty.ts b/js/DerivedProperty.ts
index d5225a0..2c57c27 100644
--- a/js/DerivedProperty.ts
+++ b/js/DerivedProperty.ts
@@ -23,8 +23,8 @@ import IntentionalAny from '../../phet-core/js/types/IntentionalAny.js';
 const DERIVED_PROPERTY_IO_PREFIX = 'DerivedPropertyIO';
 
 type DerivedPropertyDefinedOptions = {
-  tandem: Tandem,
-  phetioType?: IOType
+  tandem: Tandem;
+  phetioType?: IOType;
 };
 
 // Maps tuples/arrays from T => IReadOnlyProperty<T>
diff --git a/js/DynamicProperty.ts b/js/DynamicProperty.ts
index 1fcbb0f..b7261c5 100644
--- a/js/DynamicProperty.ts
+++ b/js/DynamicProperty.ts
@@ -114,7 +114,7 @@ type SelfOptions<ThisValueType, InnerValueType, OuterValueType> = {
   // If valuePropertyProperty.value === null, this dynamicProperty will act instead like
   // derive( valuePropertyProperty.value ) === new Property( defaultValue ). Note that if a custom map function is
   // provided, it will be applied to this defaultValue to determine our Property's value.
-  defaultValue?: InnerValueType,
+  defaultValue?: InnerValueType;
 
   // Maps a non-null valuePropertyProperty.value into the Property to be used. See top-level documentation for usage.
   // If it's a string, it will grab that named property out (e.g. it's like passing u => u[ derive ])
diff --git a/js/EmitterTests.ts b/js/EmitterTests.ts
index adfd0e8..6fbcb98 100644
--- a/js/EmitterTests.ts
+++ b/js/EmitterTests.ts
@@ -91,7 +91,7 @@ QUnit.test( 'Emitter Basics', assert => {
 } );
 
 QUnit.test( 'Emitter Tricks', assert => {
-  const entries: Array<{ listener: string, arg: string }> = [];
+  const entries: Array<{ listener: string; arg: string }> = [];
 
   const emitter = new Emitter<[ string ]>( {
     parameters: [ { valueType: 'string' } ]
diff --git a/js/EnumerationProperty.ts b/js/EnumerationProperty.ts
index bcf0e99..b9e56fa 100644
--- a/js/EnumerationProperty.ts
+++ b/js/EnumerationProperty.ts
@@ -16,7 +16,7 @@ type SelfOptions<T extends EnumerationValue> = {
 
   // By default, this will be taken from the initial value, but if subtyping enumerations, you must provide this
   // manually to make sure it is set to the correct, subtype value, see https://github.com/phetsims/phet-core/issues/102
-  enumeration?: Enumeration<T>
+  enumeration?: Enumeration<T>;
 };
 
 export type EnumerationPropertyOptions<T extends EnumerationValue> = SelfOptions<T> & Omit<PropertyOptions<T>, 'phetioType'>;
diff --git a/js/Property.ts b/js/Property.ts
index 705be4b..4f96695 100644
--- a/js/Property.ts
+++ b/js/Property.ts
@@ -37,8 +37,8 @@ let globalId = 0; // autoincremented for unique IDs
 type PropertyDefinedOptions = {
   tandem: Tandem;
   useDeepEquality: boolean;
-  units: string | null,
-  reentrant: boolean
+  units: string | null;
+  reentrant: boolean;
 };
 
 // Options used in the contstructor
@@ -51,7 +51,7 @@ export type PropertyOptions<T> = Partial<PropertyDefinedOptions> & {
   validValues?: readonly T[];
   valueType?: any;
   arrayElementType?: any;
-  isValidValue?: any
+  isValidValue?: any;
 } & PhetioObjectOptions;
 
 // a Property (can't be a TinyProperty) with all of the value-mutation removed.
diff --git a/js/TinyEmitter.ts b/js/TinyEmitter.ts
index a032c29..9c00b3d 100644
--- a/js/TinyEmitter.ts
+++ b/js/TinyEmitter.ts
@@ -13,8 +13,8 @@ import axon from './axon.js';
 const shuffleListeners = _.hasIn( window, 'phet.chipper.queryParameters' ) && phet.chipper.queryParameters.shuffleListeners;
 
 type EmitContext = {
-  index: number,
-  listenerArray?: Function[]
+  index: number;
+  listenerArray?: Function[];
 };
 type Listener<T extends any[]> = ( ...args: T ) => void;
 
diff --git a/js/TinyForwardingProperty.ts b/js/TinyForwardingProperty.ts
index 8c580d5..13c9222 100644
--- a/js/TinyForwardingProperty.ts
+++ b/js/TinyForwardingProperty.ts
@@ -17,8 +17,8 @@ import IProperty from './IProperty.js';
 import { PropertyLazyLinkListener } from './IReadOnlyProperty.js';
 
 type NodeLike = {
-  updateLinkedElementForProperty: <T>( tandemName: string, oldProperty?: IProperty<T> | null, newProperty?: IProperty<T> | null ) => void,
-  isPhetioInstrumented: () => boolean
+  updateLinkedElementForProperty: <T>( tandemName: string, oldProperty?: IProperty<T> | null, newProperty?: IProperty<T> | null ) => void;
+  isPhetioInstrumented: () => boolean;
 };
 
 export default class TinyForwardingProperty<T> extends TinyProperty<T> {
diff --git a/js/TinyProperty.ts b/js/TinyProperty.ts
index 547a73a..0ea796f 100644
--- a/js/TinyProperty.ts
+++ b/js/TinyProperty.ts
@@ -16,7 +16,7 @@ import IProperty from './IProperty.js';
 import { PropertyLinkListener, PropertyLazyLinkListener, PropertyListener } from './IReadOnlyProperty.js';
 
 type ComparableObject = {
-  equals: ( a: any ) => boolean
+  equals: ( a: any ) => boolean;
 };
 export type TinyPropertyEmitterParameters<T> = [ T, T | null, IProperty<T> ];
 export type TinyPropertyOnBeforeNotify<T> = ( ...args: TinyPropertyEmitterParameters<T> ) => void;
diff --git a/js/createObservableArray.ts b/js/createObservableArray.ts
index be6b9b0..dbd420e 100644
--- a/js/createObservableArray.ts
+++ b/js/createObservableArray.ts
@@ -49,7 +49,7 @@ type ObservableArray<T> = {
   removeAll: ( elements: T[] ) => void;
   clear: () => void;
   count: ( predicate: Predicate<T> ) => number;
-  find: ( predicate: Predicate<T>, fromIndex?: number ) => T | undefined,
+  find: ( predicate: Predicate<T>, fromIndex?: number ) => T | undefined;
   shuffle: ( random: FakeRandom<T> ) => void;
   getArrayCopy: () => T[];
   dispose: () => void;