Make the SDK friendly to locally link and develop on

Fix https://github.com/vector-im/hydrogen-web/issues/686
Fix https://github.com/vector-im/hydrogen-web/issues/682

Instead of deleting the whole `target/` directory, leave it alone so the symlink
driving the `npm link`/`yarn link` stays in tact.

Leave Vite builds in their build directories (`/lib-build`/`/asset-build`)
so you can `vite build --watch` to build on local changes and still have a
consisent place to reference in the `package.json` `exports`. Previously,
everything relied on `build.sh` which does a bunch of moving and renaming
and made it hard to rebuild on changes.

Add back support for CommonJS (adding the `package.json` `exports`).

The last piece is making sure the `?url` imports (`import workerPath from 'hydrogen-view-sdk/main.js?url';`)
work still. It looks like this may have just been solved via
https://github.com/vitejs/vite/issues/6725 -> https://github.com/vitejs/vite/pull/7073
(literally 2 days ago) and we just need to wait for the next Vite release 🎉

scripts/sdk/base-manifest.json

@@ -2,6 +2,17 @@
     "name": "hydrogen-view-sdk",
     "description": "Embeddable matrix client library, including view components",
     "version": "0.0.5",
-    "main": "./hydrogen.es.js",
+    "main": "./hydrogen.cjs.js",
+    "exports": {
+        ".": {
+            "import": "./lib-build/hydrogen.es.js",
+            "require": "./lib-build/hydrogen.cjs.js"
+        },
+        "./paths/vite": "./paths/vite.js",
+        "./style.css": "./asset-build/assets/index.css",
+        "./main.js": "./asset-build/assets/download-sandbox.html",
+        "./download-sandbox.html": "./asset-build/assets/download-sandbox.html",
+        "./assets/*": "./asset-build/assets/*"
+    },
     "type": "module"
 }

scripts/sdk/build.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-rm -rf target
+rm -rf target/*
 yarn run vite build -c vite.sdk-assets-config.js
 yarn run vite build -c vite.sdk-lib-config.js
 yarn tsc -p tsconfig-declaration.json
@@ -10,13 +10,7 @@ mkdir target/paths
 cp doc/SDK.md target/README.md
 pushd target
 pushd asset-build/assets
-mv main.*.js ../../main.js
-mv index.*.css ../../style.css
-mv download-sandbox.*.html ../../download-sandbox.html
-rm *.js *.wasm
-mv ./* ../../
+rm !(main).js *.wasm
 popd
-rm -rf asset-build
-mv lib-build/* .
-rm -rf lib-build
+rm index.html
 popd

scripts/sdk/create-manifest.js

@@ -3,21 +3,7 @@ const fs = require("fs");
 const appManifest = require("../../package.json");
 const baseSDKManifest = require("./base-manifest.json");
 /*
-    need to leave exports out of base-manifest.json because of #vite-bug,
-    with the downside that we can't support environments that support
-    both esm and commonjs modules, so we pick just esm.
-    ```
-    "exports": {
-        ".": {
-            "import": "./hydrogen.es.js",
-            "require": "./hydrogen.cjs.js"
-        },
-        "./paths/vite": "./paths/vite.js",
-        "./style.css": "./style.css"
-    },
-    ```
-
-    Also need to leave typescript type definitions out until the
+    Need to leave typescript type definitions out until the
     typescript conversion is complete and all imports in the d.ts files
     exists.
     ```

vite.sdk-assets-config.js

@@ -2,10 +2,29 @@ const path = require("path");
 const mergeOptions = require('merge-options');
 const commonOptions = require("./vite.common-config.js");
 
+const pathsToExport = [
+    "index.js",
+    "index.css",
+    "download-sandbox.html"
+];
+
 export default mergeOptions(commonOptions, {
     root: "src/",
     base: "./",
     build: {
         outDir: "../target/asset-build/",
+        rollupOptions: {
+            output: {
+              assetFileNames: (chunkInfo) => {
+                  // Get rid of the hash so we can consistently reference these
+                  // files in our `package.json` `exports`
+                  if(pathsToExport.includes(path.basename(chunkInfo.name))) {
+                    return "assets/[name].[ext]";
+                  }
+
+                return "assets/[name]-[hash][extname]";
+              }
+            }
+        }
     },
 });