WIP: Export types and update README

packages/mdc-chips/README.md

@@ -307,16 +307,16 @@ Method Signature | Description
 
 Property | Value Type | Description
 --- | --- | ---
-`chips` | Array<`MDCChip`> | An array of the `MDCChip` objects that represent chips in the set
-`selectedChipIds` | `!Array<string>` (read-only) | An array of the IDs of all selected chips
+`chips` | `MDCChip` | An array of the `MDCChip` objects that represent chips in the set
+`selectedChipIds` | `string[]` (read-only) | An array of the IDs of all selected chips
 
 ## Usage within Web Frameworks
 
 If you are using a JavaScript framework, such as React or Angular, you can create Chips for your framework. Depending on your needs, you can use the _Simple Approach: Wrapping MDC Web Vanilla Components_, or the _Advanced Approach: Using Foundations and Adapters_. Please follow the instructions [here](../../docs/integrating-into-frameworks.md).
 
 ### Adapters: `MDCChipAdapter` and `MDCChipSetAdapter`
 
-See [`chip/index.js`](chip/index.js) and [`chip-set/index.js`](chip-set/index.js) for vanilla DOM implementations of these adapter APIs for reference.
+See [`chip/index.ts`](chip/index.ts) and [`chip-set/index.ts`](chip-set/index.ts) for vanilla DOM implementations of these adapter APIs for reference.
 
 #### `MDCChipAdapter`
 
@@ -336,7 +336,7 @@ Method Signature | Description
 `setStyleProperty(propertyName: string, value: string) => void` | Sets the property value of the given style property on the root element
 `hasLeadingIcon() => boolean` | Returns whether the chip has a leading icon
 `getRootBoundingClientRect() => ClientRect` | Returns the bounding client rect of the root element
-`getCheckmarkBoundingClientRect() => ?ClientRect` | Returns the bounding client rect of the checkmark element or null if it doesn't exist
+`getCheckmarkBoundingClientRect() => ClientRect \| null` | Returns the bounding client rect of the checkmark element or null if it doesn't exist
 
 > \*_NOTE_: `notifyInteraction` and `notifyTrailingIconInteraction` must pass along the target chip's ID, and must be observable by the parent `mdc-chip-set` element (e.g. via DOM event bubbling).
 
@@ -382,7 +382,7 @@ Events | Element Selector | Foundation Handler
 
 Method Signature | Description
 --- | ---
-`getSelectedChipIds() => !Array<string>` | Returns an array of the IDs of all selected chips
+`getSelectedChipIds() => string[]` | Returns an array of the IDs of all selected chips
 `select(chipId: string) => void` | Selects the chip with the given id
 `handleChipInteraction(chipId: string) => void` | Handles a custom `MDCChip:interaction` event on the root element
 `handleChipSelection(chipId: string, selected: boolean) => void` | Handles a custom `MDCChip:selection` event on the root element

packages/mdc-chips/index.ts

@@ -24,6 +24,7 @@
 export * from './chip/adapter';
 export * from './chip/foundation';
 export * from './chip/index';
+export * from './chip/types';
 export * from './chip-set/adapter';
 export * from './chip-set/foundation';
 export * from './chip-set/index';