Export all public types directly from workbox-core

[philipwalton]

R: @jeffposnick

Fixes #2252

This PR exports all public TypeScript types directly from workbox-core, so developers can import them without needing sub-package references.

It also keeps all the types defined in a single types.ts file at the root level, so developers wanting to make it clear in their source code what is a type and what is a part of the API can do something like this:

import {somePublicMethod} from 'workbox-core';
import {SomeTypeDefinition} from 'workbox-core/types';

[jeffposnick]

👍

[workbox-pr-bot]

PR-Bot Size Plugin

Changed File Sizes

No file sizes have changed.

New Files

No new files have been added.

All File Sizes

View Table

File	Before	After	Change	GZipped
packages/workbox-background-sync/build/workbox-background-sync.prod.js	3.87 KB	3.87 KB	0%	1.60 KB
packages/workbox-broadcast-update/build/workbox-broadcast-update.prod.js	1.34 KB	1.34 KB	0%	738 B
packages/workbox-build/build/_types.js	41 B	41 B	0%	61 B
packages/workbox-build/build/generate-sw.js	2.75 KB	2.75 KB	0%	1.23 KB
packages/workbox-build/build/get-manifest.js	1.60 KB	1.60 KB	0%	779 B
packages/workbox-build/build/index.js	613 B	613 B	0%	344 B
packages/workbox-build/build/inject-manifest.js	4.93 KB	4.93 KB	0%	1.90 KB
packages/workbox-cacheable-response/build/workbox-cacheable-response.prod.js	610 B	610 B	0%	356 B
packages/workbox-cli/build/app.js	4.16 KB	4.16 KB	0%	1.64 KB
packages/workbox-cli/build/bin.js	940 B	940 B	0%	502 B
packages/workbox-core/build/workbox-core.prod.js	6.84 KB	6.84 KB	0%	2.84 KB
packages/workbox-expiration/build/workbox-expiration.prod.js	3.00 KB	3.00 KB	0%	1.30 KB
packages/workbox-google-analytics/build/workbox-offline-ga.prod.js	1.97 KB	1.97 KB	0%	915 B
packages/workbox-navigation-preload/build/workbox-navigation-preload.prod.js	659 B	659 B	0%	323 B
packages/workbox-precaching/build/workbox-precaching.prod.js	4.95 KB	4.95 KB	0%	1.92 KB
packages/workbox-range-requests/build/workbox-range-requests.prod.js	1.64 KB	1.64 KB	0%	808 B
packages/workbox-routing/build/workbox-routing.prod.js	3.10 KB	3.10 KB	0%	1.35 KB
packages/workbox-strategies/build/workbox-strategies.prod.js	4.10 KB	4.10 KB	0%	1.13 KB
packages/workbox-streams/build/workbox-streams.prod.js	1.44 KB	1.44 KB	0%	698 B
packages/workbox-sw/build/workbox-sw.js	1.34 KB	1.34 KB	0%	746 B
packages/workbox-webpack-plugin/build/generate-sw.js	4.72 KB	4.72 KB	0%	1.76 KB
packages/workbox-webpack-plugin/build/index.js	349 B	349 B	0%	255 B
packages/workbox-webpack-plugin/build/inject-manifest.js	6.67 KB	6.67 KB	0%	2.20 KB
packages/workbox-window/build/workbox-window.dev.umd.js	41.91 KB	41.91 KB	0%	9.29 KB
packages/workbox-window/build/workbox-window.prod.umd.js	4.54 KB	4.54 KB	0%	1.85 KB

Workbox Aggregate Size Plugin

3.51KB gzip'ed (23% of limit)
7.93KB uncompressed

[coveralls]

Coverage remained the same at 79.409% when pulling c6385d9 on type-exports into f23924a on master.