build: Use shared packages through modules

By running the build for the shared packages only once, errors in them
are reported only once in watch mode.

We still have to point jest to the original source files (and rebuild
the shared source files as part of the test), because it won't load the
"module" entry of the shared packages. However, as a benefit, jest can
now run even if the shared packages haven't been built yet.

2 files changed, 22 insertions, 1 deletions

diff --git a/packages/service-shared/esbuild.config.js b/packages/service-shared/esbuild.config.js
new file mode 100644
index 0000000..ce57cd7
--- /dev/null
+++ b/packages/service-shared/esbuild.config.js
@@ -0,0 +1,21 @@
+// @ts-check
+
+const { chrome } = require('../../config/build-common');
+const { getConfig } = require('../../config/esbuild-config');
+
+module.exports = getConfig({
+  absWorkingDir: __dirname,
+  entryPoints: [
+    'src/index.ts',
+  ],
+  outfile: 'dist/index.mjs',
+  format: 'esm',
+  // The package that includes this one will have a header comment,
+  // no need to have an additional one here.
+  banner: {},
+  platform: 'node',
+  target: chrome,
+  external: [
+    'zod',
+  ],
+});
diff --git a/packages/service-shared/package.json b/packages/service-shared/package.json
index 6f34a9d..e812e4a 100644
--- a/packages/service-shared/package.json
+++ b/packages/service-shared/package.json
@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "sideEffects": false,
-  "main": "src/index.ts",
+  "module": "dist/index.mjs",
   "types": "dist/index.d.ts",
   "scripts": {
     "typecheck": "tsc"