feat(bob): add exclude option to config (callstack#450)

### Summary

This adds the possibility to pass custom ignore patterns while working
with builder bob.

### Test plan

1. Create a new library using `create-react-native-library`. You can
select `Native module`, and `Kotlin & Swift` options.
2. Go to `package.json`, and find the `react-native-builder-bob` section
3. Replace `commonjs` target as following:
```json
{
    "exclude": "**/ignore_me/**"
    "targets": [
      "commonjs",
      "module",
      [
        "typescript",
        {
          "project": "tsconfig.build.json"
        }
      ]
    ]
}
```
4. Create a new folder named `src/ignore_me` and put `.ts` files inside
it
5. Build the library and make sure the files inside the `ignore_me`
aren't included in the `commonjs` and `module` targets.

Author: atlj

README.md

@@ -141,6 +141,20 @@ The name of the folder with the source code which should be compiled. The folder
 
 The name of the folder where the compiled files should be output to. It will contain separate folder for each target.
 
+#### `exclude`
+
+Glob pattern to be used while filtering the unnecessary files. Defaults to `'**/{__tests__,__fixtures__,__mocks__}/**'` if you don't specify it.
+
+> This option only works with `commonjs` and `module` targets. To exclude files while building `typescript`, please see [the tsconfig exclude field](https://www.typescriptlang.org/tsconfig#exclude).
+
+Example:
+
+```json
+{
+  "exclude": "ignore_me/**"
+}
+```
+
 #### `targets`
 
 Various targets to build for. The available targets are:

packages/react-native-builder-bob/src/index.ts

@@ -390,6 +390,9 @@ yargs
       );
     }
 
+    const exclude =
+      options.exclude ?? '**/{__tests__,__fixtures__,__mocks__}/**';
+
     const report = {
       info: logger.info,
       warn: logger.warn,
@@ -418,6 +421,7 @@ yargs
             root,
             source: path.resolve(root, source as string),
             output: path.resolve(root, output as string, 'commonjs'),
+            exclude,
             options: targetOptions,
             report,
           });
@@ -427,6 +431,7 @@ yargs
             root,
             source: path.resolve(root, source as string),
             output: path.resolve(root, output as string, 'module'),
+            exclude,
             options: targetOptions,
             report,
           });

packages/react-native-builder-bob/src/targets/commonjs.ts

@@ -11,12 +11,14 @@ type Options = Input & {
     sourceMaps?: boolean;
     copyFlow?: boolean;
   };
+  exclude: string;
 };
 
 export default async function build({
   root,
   source,
   output,
+  exclude,
   options,
   report,
 }: Options) {
@@ -31,6 +33,7 @@ export default async function build({
     root,
     source,
     output,
+    exclude,
     modules: 'commonjs',
     report,
     field: 'main',

packages/react-native-builder-bob/src/targets/module.ts

@@ -11,12 +11,14 @@ type Options = Input & {
     sourceMaps?: boolean;
     copyFlow?: boolean;
   };
+  exclude: string;
 };
 
 export default async function build({
   root,
   source,
   output,
+  exclude,
   options,
   report,
 }: Options) {
@@ -31,6 +33,7 @@ export default async function build({
     root,
     source,
     output,
+    exclude,
     modules: false,
     report,
     field: 'module',

packages/react-native-builder-bob/src/types.ts

@@ -19,4 +19,5 @@ export type Options = {
   source?: string;
   output?: string;
   targets?: (Target | [Target, object])[];
+  exclude?: string;
 };

packages/react-native-builder-bob/src/utils/compile.ts

@@ -13,6 +13,7 @@ type Options = Input & {
   copyFlow?: boolean;
   modules: 'commonjs' | false;
   field: 'main' | 'module';
+  exclude: string;
 };
 
 export default async function compile({
@@ -21,6 +22,7 @@ export default async function compile({
   output,
   babelrc = false,
   configFile = false,
+  exclude,
   modules,
   copyFlow,
   sourceMaps = true,
@@ -31,7 +33,7 @@ export default async function compile({
     cwd: source,
     absolute: true,
     nodir: true,
-    ignore: '**/{__tests__,__fixtures__,__mocks__}/**',
+    ignore: exclude,
   });
 
   report.info(