fix: devtool cmd line not work and default value

Author: Meet-student

packages/rspack-cli/src/cli.ts

@@ -172,6 +172,11 @@ export class RspackCLI {
 			if (typeof item.devtool === "undefined") {
 				item.devtool = isBuild ? "source-map" : "cheap-module-source-map";
 			}
+			// user parameters always has highest priority than default devtool and config devtool
+			if (typeof options.devtool !== "undefined") {
+				item.devtool = options.devtool as RspackOptions["devtool"];
+			}
+
 			if (isServe) {
 				const installed = (item.plugins ||= []).find(
 					item => item instanceof rspackCore.ProgressPlugin

packages/rspack-cli/src/utils/options.ts

@@ -58,10 +58,15 @@ export const commonOptionsForBuildAndServe = (yargs: yargs.Argv) => {
 				describe: "env passed to config function"
 			},
 			devtool: {
-				type: "boolean",
-				default: false,
+				type: "string",
+				default: "eval",
 				describe: "devtool",
-				alias: "d"
+				alias: "d",
+				coerce: arg => {
+					if (arg === "true") return "eval"; // --devtool true 等价于 "eval"
+					if (arg === "false") return false; // --devtool false 表示禁用
+					return arg;
+				}
 			}
 		})
 		.alias({ v: "version", h: "help" });