Add esbuild/esbuild-loader to reduce memory usage when make dev (#3220)

src/common/getTSLoader.ts

@@ -0,0 +1,63 @@
+/**
+ * Copyright (c) 2021 OpenLens Authors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+import esbuild from "esbuild";
+
+/**
+ * A function returning webpack ts/tsx loader
+ * 
+ * depends on env LENS_DEV_USE_ESBUILD_LOADER to use esbuild-loader (faster) or good-old ts-loader
+ * 
+ * @param testRegExp - the regex for webpack to conditional find the files 
+ * @returns ts/tsx webpack loader configuration object
+ */
+const getTSLoader = (
+  testRegExp: RegExp, transpileOnly = true
+) => {
+  const useEsbuildLoader = process.env.LENS_DEV_USE_ESBUILD_LOADER === "true";
+
+  useEsbuildLoader && console.info(`\n🚀 using esbuild-loader for ts(x)`);
+
+  if (useEsbuildLoader) {
+    return {
+      test: testRegExp,
+      loader: "esbuild-loader",
+      options: {
+        loader: "tsx",
+        target: "es2015",
+        implementation: esbuild
+      },
+    };
+  }
+
+  return {
+    test: testRegExp,
+    exclude: /node_modules/,
+    use: {
+      loader: "ts-loader",
+      options: {
+        transpileOnly,
+      }
+    }
+  };
+};
+
+export default getTSLoader;