feat: Provide a default importer in parallel to the factory

Author: danez

packages/react-docgen/src/config.ts

@@ -14,7 +14,7 @@ import {
   propTypeHandler,
 } from './handlers';
 import type { Importer } from './importer';
-import { makeFsImporter } from './importer';
+import { fsImporter } from './importer';
 import type { Resolver } from './resolver';
 import { findExportedComponentDefinition } from './resolver';
 
@@ -33,7 +33,7 @@ export interface Config {
 export type InternalConfig = Omit<Required<Config>, 'filename'>;
 
 const defaultResolver: Resolver = findExportedComponentDefinition;
-const defaultImporter: Importer = makeFsImporter();
+const defaultImporter: Importer = fsImporter;
 
 export const defaultHandlers: Handler[] = [
   propTypeHandler,

packages/react-docgen/src/importer/makeFsImporter.ts renamed to packages/react-docgen/src/importer/fsImporter.ts

@@ -24,7 +24,7 @@ interface TraverseState {
 }
 
 // Factory for the resolveImports importer
-export default function makeFsImporter(
+export function makeFsImporter(
   lookupModule: (
     filename: string,
     basedir: string,
@@ -216,3 +216,7 @@ export default function makeFsImporter(
 
   return resolveImportedValue;
 }
+
+const defaultFsImporter = makeFsImporter();
+
+export default defaultFsImporter;

packages/react-docgen/src/importer/ignoreImports.ts

@@ -0,0 +1,7 @@
+import type { Importer } from '.';
+
+const ignoreImports: Importer = function (): null {
+  return null;
+};
+
+export default ignoreImports;

packages/react-docgen/src/importer/index.ts

@@ -5,8 +5,8 @@ import type {
   ImportDeclaration,
 } from '@babel/types';
 import type FileState from '../FileState';
-import makeIgnoreImports from './makeIgnoreImports';
-import makeFsImporter from './makeFsImporter';
+import ignoreImports from './ignoreImports';
+import fsImporter, { makeFsImporter } from './fsImporter';
 
 export type ImportPath = NodePath<
   ExportAllDeclaration | ExportNamedDeclaration | ImportDeclaration
@@ -18,4 +18,4 @@ export type Importer = (
   file: FileState,
 ) => NodePath | null;
 
-export { makeIgnoreImports, makeFsImporter };
+export { fsImporter, ignoreImports, makeFsImporter };