✨ add esm option. Add extension to imported file

README.md

@@ -203,6 +203,18 @@ Use 'single quotes' in the generated barrel files instead of the default "double
 
 Omit semicolons from the end of lines in the generated barrel files.
 
+### `-m` or `--esm`
+
+Enable ESM mode. Add `.js` extension to imported files.
+
+```typescript
+export * from "./barrel.js";
+export * from "./index.js";
+export * from "./directory2/script.js";
+export * from "./directory2/directory4/deeplyNested.js";
+export * from "./directory3/program.js";
+```
+
 ### `-v` or `--version`
 
 Display the barrelsby version number.

src/builder.test.ts

@@ -2,20 +2,20 @@ import fs from 'fs';
 import MockFs from 'mock-fs';
 import Sinon from 'sinon';
 
-import { build, buildImportPath, getBasename } from './builder';
+import {build, buildImportPath, getBasename} from './builder';
 import * as FileSystem from './builders/fileSystem';
 import * as Flat from './builders/flat';
 import * as Header from './builders/header';
 import * as Modules from './modules';
-import { StructureOption } from './options/options';
+import {InputTypeOption, StructureOption} from './options/options';
 import * as TestUtilities from './testUtilities';
-import { Directory } from './interfaces/directory.interface';
-import { FileTreeLocation } from './interfaces/location.interface';
-import { Signale } from 'signale';
-import { BaseUrl } from './options/baseUrl';
-import { Logger } from './options/logger';
-import { SemicolonCharacter } from './options/noSemicolon';
-import { QuoteCharacter } from './options/quoteCharacter';
+import {Directory} from './interfaces/directory.interface';
+import {FileTreeLocation} from './interfaces/location.interface';
+import {Signale} from 'signale';
+import {BaseUrl} from './options/baseUrl';
+import {Logger} from './options/logger';
+import {SemicolonCharacter} from './options/noSemicolon';
+import {QuoteCharacter} from './options/quoteCharacter';
 import * as BuildBarrelModule from './tasks/BuildBarrel';
 
 // Gets a location from a list by name.
@@ -35,6 +35,7 @@ describe('builder/builder module has a', () => {
           barrelType: StructureOption;
           quoteCharacter: QuoteCharacter;
           semicolonCharacter: SemicolonCharacter;
+          inputType: InputTypeOption;
           barrelName: string;
           logger: Logger;
           // Gets a location from a list by name.
@@ -63,6 +64,7 @@ describe('builder/builder module has a', () => {
         local: false,
         include: [],
         exclude: [],
+        inputType: InputTypeOption.COMMONJS,
       });
     };
     beforeEach(() => {
@@ -150,6 +152,7 @@ describe('builder/builder module has a', () => {
         local: false,
         include: [],
         exclude: [],
+        inputType:InputTypeOption.MODULE,
       });
     };
     beforeEach(() => {

src/builder.ts

@@ -1,13 +1,13 @@
 import path from 'path';
-import { BaseUrl } from './options/baseUrl';
-import { Logger } from './options/logger';
-import { SemicolonCharacter } from './options/noSemicolon';
-import { StructureOption } from './options/options';
-import { QuoteCharacter } from './options/quoteCharacter';
-import { convertPathSeparator, thisDirectory } from './utilities';
-import { buildBarrel } from './tasks/BuildBarrel';
-import { Directory } from './interfaces/directory.interface';
-import { FileTreeLocation } from './interfaces/location.interface';
+import {BaseUrl} from './options/baseUrl';
+import {Logger} from './options/logger';
+import {SemicolonCharacter} from './options/noSemicolon';
+import {InputTypeOption, StructureOption} from './options/options';
+import {QuoteCharacter} from './options/quoteCharacter';
+import {convertPathSeparator, thisDirectory} from './utilities';
+import {buildBarrel} from './tasks/BuildBarrel';
+import {Directory} from './interfaces/directory.interface';
+import {FileTreeLocation} from './interfaces/location.interface';
 
 export const build = (params: {
   destinations: Directory[];
@@ -21,6 +21,7 @@ export const build = (params: {
   local: boolean;
   include: string[];
   exclude: string[];
+  inputType: InputTypeOption | undefined;
 }): void => {
   try {
     // Build the barrels.
@@ -37,6 +38,7 @@ export const build = (params: {
         local: params.local,
         include: params.include,
         exclude: params.exclude,
+        inputType: params.inputType ?? InputTypeOption.COMMONJS,
       })
     );
   } catch (e) {

src/builders/fileSystem.test.ts

@@ -1,6 +1,7 @@
 import * as TestUtilities from '../testUtilities';
 import * as FileSystem from './fileSystem';
-import { Signale } from 'signale';
+import {Signale} from 'signale';
+import {InputTypeOption} from "../options/options";
 
 describe('builder/fileSystem module has a', () => {
   describe('buildFileSystemBarrel function that', () => {
@@ -15,7 +16,8 @@ describe('builder/fileSystem module has a', () => {
           '"',
           ';',
           logger,
-          undefined
+          undefined,
+          InputTypeOption.COMMONJS
         );
       });
       it('should produce the correct output', () => {
@@ -57,17 +59,18 @@ export {indexts as index};
         "'",
         ';',
         logger,
-        undefined
+        undefined,
+        InputTypeOption.MODULE
       );
     });
     it('should produce the correct output', () => {
       TestUtilities.assertMultiLine(
         output,
-        `import * as barrelts from './barrel';
-import * as directory2directory4deeplyNestedts from './directory2/directory4/deeplyNested';
-import * as directory2scriptts from './directory2/script';
-import * as directory3programts from './directory3/program';
-import * as indexts from './index';
+        `import * as barrelts from './barrel.js';
+import * as directory2directory4deeplyNestedts from './directory2/directory4/deeplyNested.js';
+import * as directory2scriptts from './directory2/script.js';
+import * as directory3programts from './directory3/program.js';
+import * as indexts from './index.js';
 export {barrelts as barrel};
 export const directory2 = {
   directory4: {
@@ -98,7 +101,8 @@ export {indexts as index};
         '"',
         '',
         logger,
-        undefined
+        undefined,
+        InputTypeOption.COMMONJS
       );
     });
     it('should produce the correct output', () => {

src/builders/fileSystem.ts

@@ -8,6 +8,7 @@ import { QuoteCharacter } from '../options/quoteCharacter';
 import { indentation, nonAlphaNumeric } from '../utilities';
 import { Directory } from '../interfaces/directory.interface';
 import { FileTreeLocation } from '../interfaces/location.interface';
+import {InputTypeOption} from "../options/options";
 
 function stringify(structure: ExportStructure, previousIndentation: string): string {
   const nextIndentation = previousIndentation + indentation;
@@ -62,10 +63,13 @@ export function buildFileSystemBarrel(
   quoteCharacter: QuoteCharacter,
   semicolonCharacter: SemicolonCharacter,
   _: Logger, // Not used
-  baseUrl: BaseUrl
+  baseUrl: BaseUrl,
+  inputType: InputTypeOption
 ): string {
   const structure: ExportStructure = {};
   let content = '';
+  const ext = `${inputType === InputTypeOption.MODULE  ? '.js' : ''}`;
+
   modules
     .map(
       (module: FileTreeLocation): Import => ({
@@ -79,7 +83,7 @@ export function buildFileSystemBarrel(
       const directoryPath = path.dirname(relativePath);
       const parts = directoryPath.split(path.sep);
       const alias = relativePath.replace(nonAlphaNumeric, '');
-      content += `import * as ${alias} from ${quoteCharacter}${imported.path}${quoteCharacter}${semicolonCharacter}
+      content += `import * as ${alias} from ${quoteCharacter}${imported.path}${ext}${quoteCharacter}${semicolonCharacter}
 `;
       const fileName = path.basename(imported.module.name, '.ts');
       buildStructureSubsection(structure, parts, fileName, alias);

src/builders/flat.test.ts

@@ -2,7 +2,8 @@ import Sinon from 'sinon';
 
 import * as TestUtilities from '../testUtilities';
 import * as Flat from './flat';
-import { Signale } from 'signale';
+import {Signale} from 'signale';
+import {InputTypeOption} from "../options/options";
 
 describe('builder/flat module has a', () => {
   describe('buildFlatBarrel function that', () => {
@@ -22,7 +23,8 @@ describe('builder/flat module has a', () => {
           ';',
           signale,
           undefined,
-          false
+          false,
+          InputTypeOption.MODULE
         );
       });
       afterEach(() => {
@@ -73,7 +75,8 @@ export * from "./directory3/program";
           ';',
           signale,
           undefined,
-          false
+          false,
+          InputTypeOption.COMMONJS
         );
       });
       afterEach(() => {
@@ -124,7 +127,8 @@ export * from './directory3/program';
           '',
           signale,
           undefined,
-          false
+          false,
+          InputTypeOption.COMMONJS
         );
       });
       afterEach(() => {
@@ -170,7 +174,8 @@ export * from "./directory3/program"
           ';',
           signale,
           undefined,
-          true
+          true,
+          InputTypeOption.COMMONJS
         );
       });
       afterEach(() => {

src/builders/flat.ts

@@ -5,6 +5,7 @@ import { SemicolonCharacter } from '../options/noSemicolon';
 import { QuoteCharacter } from '../options/quoteCharacter';
 import { Directory } from '../interfaces/directory.interface';
 import { FileTreeLocation } from '../interfaces/location.interface';
+import { InputTypeOption } from "../options/options";
 
 export function buildFlatBarrel(
   directory: Directory,
@@ -13,14 +14,17 @@ export function buildFlatBarrel(
   semicolonCharacter: SemicolonCharacter,
   logger: Logger,
   baseUrl: BaseUrl,
-  exportDefault: boolean
+  exportDefault: boolean,
+  inputType: InputTypeOption
 ): string {
+  const ext = `${inputType === InputTypeOption.MODULE ? '.js' : ''}`;
+
   return modules.reduce((previous: string, current: FileTreeLocation) => {
     const importPath = buildImportPath(directory, current, baseUrl);
     logger.debug(`Including path ${importPath}`);
     if (exportDefault) {
       const filename = getBasename(current.path);
-      previous += `export { default as ${filename} } from ${quoteCharacter}${importPath}${quoteCharacter}${semicolonCharacter}
+      previous += `export { default as ${filename} } from ${quoteCharacter}${importPath}${ext}${quoteCharacter}${semicolonCharacter}
 `;
     }
     return (previous += `export * from ${quoteCharacter}${importPath}${quoteCharacter}${semicolonCharacter}

src/index.test.ts

@@ -10,6 +10,7 @@ import * as RootPath from './options/rootPath';
 import * as Purge from './purge';
 import Sinon from 'sinon';
 import * as Builder from './builder';
+import {StructureOption} from "./options/options";
 
 describe('main module', () => {
   let spySandbox: Sinon.SinonSandbox;
@@ -32,8 +33,8 @@ describe('main module', () => {
       name: 'inputBarrelName',
       noSemicolon: true,
       singleQuotes: true,
-      structure: 'flat',
-      verbose: true,
+      structure: StructureOption.FLAT,
+      verbose: true
     };
 
     const builtTree: any = { mock: 'built tree' };
@@ -82,6 +83,7 @@ describe('main module', () => {
       barrelName,
       logger: signale,
       baseUrl,
+      inputType: args.inputType,
       exportDefault: args.exportDefault,
       structure: args.structure,
       local: args.local,

src/index.ts

@@ -15,7 +15,7 @@ import { Directory } from './interfaces/directory.interface';
 
 // TODO: Document how users can call this from their own code without using the CLI.
 // TODO: We might need to do some parameter validation for that.
-export function Barrelsby(args: Arguments) {
+export function Barrelsby(args: Partial<Arguments>) {
   // Get the launch options/arguments.
   const logger = getLogger({ isVerbose: args.verbose ?? false });
   const barrelName = getBarrelName(args.name ?? '', logger);
@@ -55,6 +55,7 @@ export function Barrelsby(args: Arguments) {
       destinations,
       quoteCharacter,
       semicolonCharacter,
+      inputType: args.inputType,
       barrelName,
       logger,
       baseUrl,

src/options/options.ts

@@ -7,6 +7,11 @@ export enum StructureOption {
   FILESYSTEM = 'filesystem',
 }
 
+export enum InputTypeOption {
+  COMMONJS = 'commonjs',
+  MODULE = 'module',
+}
+
 // Options provided by yargs.
 export interface Arguments {
   [x: string]: unknown;
@@ -24,6 +29,7 @@ export interface Arguments {
   noSemicolon?: boolean;
   singleQuotes?: boolean;
   structure?: StructureOption;
+  inputType?: InputTypeOption;
   version?: boolean;
   verbose?: boolean;
 }
@@ -94,8 +100,8 @@ export function getOptionsConfig(configParser: any): {
       type: 'string',
       alias: 'structure',
       description: 'The mode for structuring barrel file exports',
-      choices: ['flat', 'filesystem'],
-      default: 'flat',
+      choices: [StructureOption.FLAT, StructureOption.FILESYSTEM],
+      default: StructureOption.FLAT,
     },
     q: {
       type: 'boolean',
@@ -115,5 +121,12 @@ export function getOptionsConfig(configParser: any): {
       description: 'Display additional logging information',
       default: false,
     },
+    t: {
+      type: 'string',
+      alias: 'inputType',
+      description: 'Force Barrelsby to use commonjs or ES module. By default the value is commonjs',
+      choices: [InputTypeOption.COMMONJS, InputTypeOption.MODULE],
+      default: InputTypeOption.COMMONJS,
+    },
   };
 }