Use esbuild instead of rollup

README.md

@@ -33,6 +33,17 @@ python hatch_build.py
 
 This will automatically select an available runtime and build using it.
 
+For more fine-grained control over how to build the package, you can set these environment variables:
+- `EJS_BUILD_SKIP_INSTALL`: If this environment variable is set, the install step will be skipped.
+  It is expected that the required packages are available for the selected bundler.
+  No network access should be required if this variable is set.
+- `EJS_BUILD_INSTALLER`: Order of installers to try, separated by `:` on POSIX or `;` on Windows.
+  These will be used to install the required dependencies for bundling the JavaScript package.
+  Can be any of `pnpm`, `deno`, `bun` or `npm` (this is also the default order).
+- `EJS_BUILD_BUNDLER`: Order of bundlers to try, separated by `:` on POSIX or `;` on Windows.
+  These will be used to perform the bundling of the JavaScript package (calling rollup under the hood).
+  Can be any of `esbuild`, `pnpm`, `deno`, `bun`, `node` (this is also the default order).
+
 ### Tests
 
 First, make sure the project's dependencies are installed and download the player JS files:

build.mjs

@@ -0,0 +1,32 @@
+import * as esbuild from "esbuild";
+
+const buildConfig = await stdinJSON();
+const result = await esbuild.build(buildConfig);
+console.log(JSON.stringify(result.metafile ?? null));
+await esbuild.stop();
+
+async function stdinJSON() {
+  const chunks = [];
+  if (globalThis.Deno) {
+    for await (const chunk of globalThis.Deno.stdin.readable) {
+      chunks.push(chunk);
+    }
+    const length = chunks.reduce(
+      (previous, chunk) => previous + chunk.length,
+      0,
+    );
+    const buffer = new Uint8Array(length);
+    let offset = 0;
+    for (const chunk of chunks) {
+      buffer.set(chunk, offset);
+      offset += chunk.length;
+    }
+    return JSON.parse(new TextDecoder().decode(buffer));
+  }
+
+  for await (const chunk of process.stdin) {
+    chunks.push(chunk);
+  }
+  const text = Buffer.concat(chunks).toString("utf-8");
+  return JSON.parse(text);
+}