feat: add unit suffix support for BODY_SIZE_LIMIT (#11680)

.changeset/great-hats-cough.md

@@ -0,0 +1,5 @@
+---
+"@sveltejs/adapter-node": minor
+---
+
+feat: add unit suffixes to the `BODY_SIZE_LIMIT` environment variable

documentation/docs/25-build-and-deploy/40-adapter-node.md

@@ -139,6 +139,8 @@ The number of seconds to wait before forcefully closing any remaining connection
 
 When using systemd socket activation, `IDLE_TIMEOUT` specifies the number of seconds after which the app is automatically put to sleep when receiving no requests. If not set, the app runs continuously. See [Socket activation](#socket-activation) for more details.
 
+The body size variable can also specify unit suffixes for kilobytes (`K`), megabytes (`M`), and gigabytes (`G`). For example `512K` and `1M`
+
 ## Options
 
 The adapter can be configured with various options:

packages/adapter-node/src/handler.js

@@ -19,7 +19,21 @@ const address_header = env('ADDRESS_HEADER', '').toLowerCase();
 const protocol_header = env('PROTOCOL_HEADER', '').toLowerCase();
 const host_header = env('HOST_HEADER', 'host').toLowerCase();
 const port_header = env('PORT_HEADER', '').toLowerCase();
-const body_size_limit = Number(env('BODY_SIZE_LIMIT', '524288'));
+
+/**
+ * @param {string} bytes
+ */
+function parse_body_size_limit(bytes) {
+ const multiplier =
+ {
+ K: 1024,
+ M: 1024 * 1024,
+ G: 1024 * 1024 * 1024
+ }[bytes[bytes.length - 1]?.toUpperCase()] ?? 1;
+ return Number(multiplier != 1 ? bytes.substring(0, bytes.length - 1) : bytes) * multiplier;
+}
+
+const body_size_limit = parse_body_size_limit(env('BODY_SIZE_LIMIT', '512K'));
 
 if (isNaN(body_size_limit)) {
  throw new Error(