修改 babel 配置文件

Author: miccycn

generator/index.js

@@ -1,3 +1,5 @@
+const utils = require('../utils');
+
 module.exports = (api, option, rootOptions) => {
 	// 扩展 package.json
 	api.extendPackage({
@@ -16,4 +18,12 @@ module.exports = (api, option, rootOptions) => {
 	});
 	// 渲染模板
 	api.render('./template');
+
+	// 修改 babel.config.js
+	api.postProcessFiles(files => {
+		const babelConfigRaw = files['babel.config.js'];
+		if (babelConfigRaw) {
+			files['babel.config.js'] = utils.MergePresets(babelConfigRaw, 'react-app');
+		}
+	});
 };

utils/index.js

@@ -0,0 +1,24 @@
+function GetJson(func) {
+    try {
+        return eval(func);
+    } catch (e) {
+        return {};
+    }
+}
+
+function MergePresets(babelConfigRaw = {}, preset = '') {
+    const babelConfig = GetJson(babelConfigRaw);
+    if (babelConfig.presets) {
+        if (!babelConfig.presets.includes(preset)) {
+            babelConfig.presets.push(preset);
+        }
+    } else {
+        babelConfig.presets = [preset];
+    }
+    return `module.exports = ${JSON.stringify(babelConfig)}`;
+}
+
+module.exports = {
+    MergePresets,
+    GetJson
+};