fix: don't read babelrc by default

Author: satya164

package.json

@@ -37,6 +37,7 @@
     "@babel/preset-flow": "^7.9.0",
     "@babel/preset-react": "^7.9.4",
     "@babel/preset-typescript": "^7.9.0",
+    "browserslist": "^4.12.0",
     "chalk": "^4.0.0",
     "cosmiconfig": "^6.0.0",
     "cross-spawn": "^7.0.2",
@@ -60,6 +61,7 @@
     "@commitlint/config-conventional": "^8.3.4",
     "@release-it/conventional-changelog": "^1.1.4",
     "@types/babel__core": "^7.1.7",
+    "@types/browserslist": "^4.8.0",
     "@types/chalk": "^2.2.0",
     "@types/cross-spawn": "^6.0.1",
     "@types/dedent": "^0.7.0",

src/targets/commonjs.ts

@@ -32,7 +32,7 @@ export default async function build({
     modules: 'commonjs',
     babelrc: options?.babelrc,
     configFile: options?.configFile,
-    copyFlow: options?.copyFlow ? true : false,
+    copyFlow: options?.copyFlow,
     report,
   });
 }

src/targets/module.ts

@@ -32,7 +32,7 @@ export default async function build({
     modules: false,
     babelrc: options?.babelrc,
     configFile: options?.configFile,
-    copyFlow: options?.copyFlow ? true : false,
+    copyFlow: options?.copyFlow,
     report,
   });
 }

src/utils/compile.ts

@@ -2,22 +2,23 @@ import path from 'path';
 import fs from 'fs-extra';
 import chalk from 'chalk';
 import * as babel from '@babel/core';
+import browserslist from 'browserslist';
 import glob from 'glob';
 import { Input } from '../types';
 
 type Options = Input & {
-  babelrc?: boolean | null;
-  configFile?: string | false | null;
+  babelrc?: boolean | null | undefined;
+  configFile?: string | false | null | undefined;
   modules: 'commonjs' | false;
-  copyFlow: boolean;
+  copyFlow: boolean | undefined;
 };
 
 export default async function compile({
   root,
   source,
   output,
-  babelrc,
-  configFile,
+  babelrc = false,
+  configFile = false,
   modules,
   copyFlow,
   report,
@@ -62,7 +63,8 @@ export default async function compile({
                 [
                   require.resolve('@babel/preset-env'),
                   {
-                    targets: {
+                    // @ts-ignore
+                    targets: browserslist.findConfig(root) ?? {
                       browsers: [
                         '>1%',
                         'last 2 chrome versions',