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lib/editable-list/index.tsx

@@ -1,6 +1,5 @@
 import React, { Component } from 'react';
 import { connect } from 'react-redux';
-import PropTypes from 'prop-types';
 import classNames from 'classnames';
 import SmallCrossOutlineIcon from '../icons/cross-outline-small';
 import ReorderIcon from '../icons/reorder';
@@ -32,10 +31,6 @@ export class EditableList extends Component<Props> {
   reorderingOffsetY: number = 0;
   reorderingTranslateY: number = 0;
 
-  static propTypes = {
-    editing: PropTypes.bool.isRequired,
-  };
-
   static defaultProps = {
     getItemKey: (item: T.TagEntity) => item.id,
   };

lib/types.ts

@@ -73,7 +73,11 @@ export type TranslatableString = string;
 // Language and Platform
 ///////////////////////////////////////
 
+// Returns a type with the properties in T not also present in U
 export type Without<T, U> = { [P in Exclude<keyof T, keyof U>]?: never };
+
+// Either type T or type U, a powered-up union/sum type
+// useful when missing a discriminating property
 export type XOR<T, U> = T | U extends object
   ? (Without<T, U> & U) | (Without<U, T> & T)
   : T | U;