update memory usage

README.md

@@ -41,6 +41,16 @@ Oxc is 4x faster than tsc on small files, and 10x faster on larger files.
     4.43x faster than tsc
 ```
 
+### Memory Usage
+
+On `parser.ts` by using `/usr/bin/time -alh node`:
+
+|       | Max RSS |
+| ---   | ------- |
+| oxc   | 51 MB   |
+| swc   | 67MB    |
+| babel | 172MB   |
+
 ## Fixtures
 
 * [TypeScript/src/compiler/parser.ts](https://github.com/microsoft/TypeScript/blob/3ad0f752482f5e846dc35a69572ccb43311826c0/src/compiler/parser.ts) - an atypical large file with 10777 lines.

memory.sh

@@ -0,0 +1,10 @@
+#!/usr/bin/env bash
+
+echo 'oxc'
+/usr/bin/time -alh node ./src/memory/oxc.js
+
+echo 'swc'
+/usr/bin/time -alh node ./src/memory/swc.js
+
+echo 'babel'
+/usr/bin/time -alh node ./src/memory/babel.js

src/memory/babel.js

@@ -0,0 +1,13 @@
+import fs from "fs";
+import { transformSync as babelTransform } from '@babel/core'
+let filename = "./fixtures/parser.ts";
+const sourceText = fs.readFileSync(filename, "utf8");
+babelTransform(sourceText, {
+  filename,
+  babelrc: false,
+  comments: false,
+  presets: [
+    "@babel/preset-typescript",
+    ["@babel/preset-react", { runtime: 'automatic' }],
+  ]
+});

src/memory/oxc.js

@@ -0,0 +1,5 @@
+import fs from "fs";
+import { transform as oxcTransform } from "oxc-transform";
+let filename = "./fixtures/parser.ts";
+const sourceText = fs.readFileSync(filename, "utf8");
+oxcTransform(filename, sourceText);

src/memory/swc.js

@@ -0,0 +1,18 @@
+import fs from "fs";
+import { transformSync as swcTransform } from "@swc/core";
+let filename = "./fixtures/parser.ts";
+const sourceText = fs.readFileSync(filename, "utf8");
+swcTransform(sourceText, {
+  filename,
+  swcrc: false,
+  jsc: {
+    target: "esnext",
+    transform: {
+      treatConstEnumAsEnum: true,
+      react: {
+        runtime: 'automatic'
+      }
+    },
+    preserveAllComments: false,
+  }
+});