fix: add commonjs step to bob and configure main and module fields pr…

…operly (#1415)

package.json

@@ -2,7 +2,8 @@
   "name": "react-native-paper",
   "version": "3.0.0",
   "description": "Material design for React Native",
-  "main": "lib/module/index.js",
+  "main": "lib/commonjs/index.js",
+  "module": "lib/module/index.js",
   "types": "lib/typescript/src/index.d.ts",
   "files": [
     "lib",
@@ -126,6 +127,7 @@
     "source": "src",
     "output": "lib",
     "targets": [
+      "commonjs",
       "module",
       "typescript"
     ],

scripts/generate-mappings.js

@@ -5,6 +5,7 @@ const fs = require('fs');
 const types = require('babel-types');
 const parser = require('@babel/parser');
 
+const packageJson = require('../package.json');
 const root = path.resolve(__dirname, '..');
 const output = path.join(root, 'lib/mappings.json');
 const source = fs.readFileSync(path.resolve(root, 'src', 'index.tsx'), 'utf8');
@@ -20,7 +21,7 @@ const ast = parser.parse(source, {
 });
 
 const relative = (value /* : string */) =>
-  path.relative(root, path.resolve(path.dirname(require.resolve('..')), value));
+  path.relative(root, path.resolve(path.dirname(packageJson.module), value));
 
 const mappings = ast.program.body.reduce((acc, declaration, index, self) => {
   if (types.isExportNamedDeclaration(declaration)) {