feature(@putout/plugin-convert-esm-to-commonjs) add support of async function

Author: coderaiser

packages/plugin-convert-esm-to-commonjs/lib/convert-esm-to-commonjs.js

@@ -1,11 +1,14 @@
 'use strict';
 
+const {template} = require('putout');
+
 module.exports.report = () => 'Commonjs should be used insted of ESM';
 
 module.exports.replace = () => ({
     'export default __a': 'module.exports = __a',
     'export class __a {}': 'module.exports.__a = class __a {}',
-    'export function __a(__args) {}': 'module.exports.__a = function __a(__args) {}',
+    'export function __a(__args) {}': replaceFn,
+    'export async function __a(__args) {}': replaceFn,
     'export const __a = __b': 'module.exports.__a = __b',
 
     'import "__a"': 'require("__a")',
@@ -25,3 +28,12 @@ module.exports.replace = () => ({
 
 });
 
+function replaceFn({__a}, path) {
+    const {name} = __a;
+    const {declaration} = path.node;
+    const node = template.ast.fresh(`module.exports.${name} = __x`);
+    
+    node.right = declaration;
+    
+    return node;
+}

packages/plugin-convert-esm-to-commonjs/test/convert-esm-to-commonjs.js

@@ -55,3 +55,8 @@ test('plugin-convert-esm-to-commonjs: transform: import specifier', (t) => {
     t.end();
 });
 
+test('plugin-convert-esm-to-commonjs: transform: export function', (t) => {
+    t.transform('export-function');
+    t.end();
+});
+

packages/plugin-convert-esm-to-commonjs/test/fixture/export-function-fix.js

@@ -0,0 +1,16 @@
+module.exports.findMadrun = async function findMadrun(cwd) {
+    const madrunNames = [
+        '.madrun.js',
+        '.madrun.mjs',
+        '.madrun.cjs',
+    ].map(joinPartial(cwd));
+    
+    for (const name of madrunNames) {
+        const [error] = await tryToCatch(access, name);
+        
+        if (!error)
+            return name;
+    }
+    
+    return '';
+};

packages/plugin-convert-esm-to-commonjs/test/fixture/export-function.js

@@ -0,0 +1,16 @@
+export async function findMadrun(cwd) {
+    const madrunNames = [
+        '.madrun.js',
+        '.madrun.mjs',
+        '.madrun.cjs',
+    ].map(joinPartial(cwd));
+    
+    for (const name of madrunNames) {
+        const [error] = await tryToCatch(access, name);
+        
+        if (!error)
+            return name;
+    }
+    
+    return '';
+}