Improve internal API

src/config/env.ts

@@ -0,0 +1,7 @@
+export let dev: boolean;
+export let src: string;
+export let dest: string;
+
+export const set_dev = (_: boolean) => dev = _;
+export const set_src = (_: string) => src = _;
+export const set_dest = (_: string) => dest = _;

src/config/rollup.ts

@@ -0,0 +1,53 @@
+import { dev, src, dest } from './env';
+
+export default {
+	dev,
+
+	client: {
+		input: () => {
+			return `${src}/client.js`
+		},
+
+		output: () => {
+			let dir = `${dest}/client`;
+			if (process.env.SAPPER_LEGACY_BUILD) dir += `/legacy`;
+
+			return {
+				dir,
+				entryFileNames: '[name].[hash].js',
+				chunkFileNames: '[name].[hash].js',
+				format: 'esm',
+				sourcemap: dev
+			};
+		}
+	},
+
+	server: {
+		input: () => {
+			return {
+				server: `${src}/server.js`
+			};
+		},
+
+		output: () => {
+			return {
+				dir: `${dest}/server`,
+				format: 'cjs',
+				sourcemap: dev
+			};
+		}
+	},
+
+	serviceworker: {
+		input: () => {
+			return `${src}/service-worker.js`;
+		},
+
+		output: () => {
+			return {
+				file: `${dest}/service-worker.js`,
+				format: 'iife'
+			}
+		}
+	}
+};

src/config/webpack.ts

@@ -0,0 +1,55 @@
+import { dev, src, dest } from './env';
+
+export default {
+	dev,
+
+	client: {
+		entry: () => {
+			return {
+				main: `${src}/client`
+			};
+		},
+
+		output: () => {
+			return {
+				path: `${dest}/client`,
+				filename: '[hash]/[name].js',
+				chunkFilename: '[hash]/[name].[id].js',
+				publicPath: `client/`
+			};
+		}
+	},
+
+	server: {
+		entry: () => {
+			return {
+				server: `${src}/server`
+			};
+		},
+
+		output: () => {
+			return {
+				path: `${dest}/server`,
+				filename: '[name].js',
+				chunkFilename: '[hash]/[name].[id].js',
+				libraryTarget: 'commonjs2'
+			};
+		}
+	},
+
+	serviceworker: {
+		entry: () => {
+			return {
+				'service-worker': `${src}/service-worker`
+			};
+		},
+
+		output: () => {
+			return {
+				path: dest,
+				filename: '[name].js',
+				chunkFilename: '[name].[id].[hash].js'
+			}
+		}
+	}
+};