Implements a custom resolveModuleName option (#862)

* Implements a custom resolveModuleName option

* Addresses feedback

* Adds a test

* Adresses feedback

* Expands the test scope

* Fix validateLoaderOptionNames test

* prettier formatting

* Be explicit about the possible value of customResolveModuleName

* Feedback round 3

* Fix lint issues

* Bumps package.json, updates changelog

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 5.3.0
+
+* [feat: Exposes a `resolveNodeModule` option](https://github.com/TypeStrong/ts-loader/pull/862) - thanks @arcanis!
+
 ## 5.2.2
 
 * [feat: Micro-optimizations](https://github.com/TypeStrong/ts-loader/pull/855) - thanks @johnnyreilly
@@ -14,7 +18,7 @@
 
 ## 5.1.1
 
-* [fix(getTranspilationEmit): pass the raw path to transpileModule](https://github.com/TypeStrong/ts-loader/pull/835) - thanks @Brooooooklyn 
+* [fix(getTranspilationEmit): pass the raw path to transpileModule](https://github.com/TypeStrong/ts-loader/pull/835) - thanks @Brooooooklyn
 
 ## 5.1.0
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "ts-loader",
-  "version": "5.2.2",
+  "version": "5.3.0",
   "description": "TypeScript loader for webpack",
   "main": "index.js",
   "types": "dist/types/index.d.ts",

src/index.ts

@@ -254,7 +254,8 @@ const validLoaderOptions: ValidLoaderOptions[] = [
   'experimentalWatchApi',
   'allowTsInNodeModules',
   'experimentalFileCaching',
-  'projectReferences'
+  'projectReferences',
+  'resolveModuleName'
 ];
 
 /**

src/interfaces.ts

@@ -295,6 +295,21 @@ export interface ReverseDependencyGraph {
 
 export type LogLevel = 'INFO' | 'WARN' | 'ERROR';
 
+export type ResolveModuleName = (
+  moduleName: string,
+  containingFile: string,
+  compilerOptions: typescript.CompilerOptions,
+  moduleResolutionHost: typescript.ModuleResolutionHost,
+) => typescript.ResolvedModuleWithFailedLookupLocations;
+
+export type CustomResolveModuleName = (
+  moduleName: string,
+  containingFile: string,
+  compilerOptions: typescript.CompilerOptions,
+  moduleResolutionHost: typescript.ModuleResolutionHost,
+  parentResolver: ResolveModuleName
+) => typescript.ResolvedModuleWithFailedLookupLocations;
+
 export interface LoaderOptions {
   silent: boolean;
   logLevel: LogLevel;
@@ -320,6 +335,7 @@ export interface LoaderOptions {
   allowTsInNodeModules: boolean;
   experimentalFileCaching: boolean;
   projectReferences: boolean;
+  resolveModuleName?: CustomResolveModuleName;
 }
 
 export interface TSFile {

src/servicesHost.ts

@@ -3,6 +3,7 @@ import * as typescript from 'typescript';
 
 import * as constants from './constants';
 import {
+  CustomResolveModuleName,
   ModuleResolutionHost,
   ResolvedModule,
   ResolveSync,
@@ -36,7 +37,11 @@ export function makeServicesHost(
     compiler,
     compilerOptions,
     files,
-    loaderOptions: { appendTsSuffixTo, appendTsxSuffixTo }
+    loaderOptions: {
+      appendTsSuffixTo,
+      appendTsxSuffixTo,
+      resolveModuleName: customResolveModuleName
+    }
   } = instance;
 
   const newLine =
@@ -148,7 +153,8 @@ export function makeServicesHost(
         instance,
         moduleNames,
         containingFile,
-        getResolutionStrategy
+        getResolutionStrategy,
+        customResolveModuleName
       ),
 
     getCustomTransformers: () => instance.transformers
@@ -426,7 +432,8 @@ function resolveModuleNames(
   instance: TSInstance,
   moduleNames: string[],
   containingFile: string,
-  resolutionStrategy: ResolutionStrategy
+  resolutionStrategy: ResolutionStrategy,
+  customResolveModuleName?: CustomResolveModuleName
 ) {
   const resolvedModules = moduleNames.map(moduleName =>
     resolveModuleName(
@@ -438,7 +445,8 @@ function resolveModuleNames(
       instance,
       moduleName,
       containingFile,
-      resolutionStrategy
+      resolutionStrategy,
+      customResolveModuleName
     )
   );
 
@@ -457,6 +465,21 @@ function isJsImplementationOfTypings(
   );
 }
 
+function applyTsResolver(
+  compiler: typeof typescript,
+  moduleName: string,
+  containingFile: string,
+  compilerOptions: typescript.CompilerOptions,
+  moduleResolutionHost: typescript.ModuleResolutionHost
+) {
+  return compiler.resolveModuleName(
+    moduleName,
+    containingFile,
+    compilerOptions,
+    moduleResolutionHost
+  );
+}
+
 function resolveModuleName(
   resolveSync: ResolveSync,
   moduleResolutionHost: ModuleResolutionHost,
@@ -466,7 +489,8 @@ function resolveModuleName(
   instance: TSInstance,
   moduleName: string,
   containingFile: string,
-  resolutionStrategy: ResolutionStrategy
+  resolutionStrategy: ResolutionStrategy,
+  customResolveModuleName?: CustomResolveModuleName
 ) {
   const { compiler, compilerOptions } = instance;
 
@@ -496,12 +520,34 @@ function resolveModuleName(
     // tslint:disable-next-line:no-empty
   } catch (e) {}
 
-  const tsResolution = compiler.resolveModuleName(
-    moduleName,
-    containingFile,
-    compilerOptions,
-    moduleResolutionHost
-  );
+  const tsResolution =
+    customResolveModuleName !== undefined
+      ? customResolveModuleName(
+          moduleName,
+          containingFile,
+          compilerOptions,
+          moduleResolutionHost,
+          (
+            moduleNameFromCustomFn: string,
+            containingFileFromCustomFn: string,
+            compilerOptionsFromCustomFn: typescript.CompilerOptions,
+            moduleResolutionHostFromCustomFn: typescript.ModuleResolutionHost
+          ) =>
+            applyTsResolver(
+              compiler,
+              moduleNameFromCustomFn,
+              containingFileFromCustomFn,
+              compilerOptionsFromCustomFn,
+              moduleResolutionHostFromCustomFn
+            )
+        )
+      : applyTsResolver(
+          compiler,
+          moduleName,
+          containingFile,
+          compilerOptions,
+          moduleResolutionHost
+        );
 
   if (tsResolution.resolvedModule !== undefined) {
     const resolvedFileName = path.normalize(

test/comparison-tests/validateLoaderOptionNames/expectedOutput-3.1/bundle.js

@@ -93,7 +93,7 @@
 /*! no static exports found */
 /***/ (function(module, exports) {
 
-eval("throw new Error(\"Module build failed (from C:/source/ts-loader/index.js):/nError: ts-loader was supplied with an unexpected loader option: notRealOption/n/nPlease take a look at the options you are supplying; the following are valid options:/nsilent / logLevel / logInfoToStdOut / instance / compiler / context / configFile / transpileOnly / ignoreDiagnostics / errorFormatter / colors / compilerOptions / appendTsSuffixTo / appendTsxSuffixTo / onlyCompileBundledFiles / happyPackMode / getCustomTransformers / reportFiles / experimentalWatchApi / allowTsInNodeModules / experimentalFileCaching / projectReferences/n/n    at validateLoaderOptions (C://source//ts-loader//dist//index.js:151:19)/n    at getLoaderOptions (C://source//ts-loader//dist//index.js:110:5)/n    at Object.loader (C://source//ts-loader//dist//index.js:16:21)\");\n\n//# sourceURL=webpack:///./app.ts?");
+eval("throw new Error(\"Module build failed (from C:/source/ts-loader/index.js):/nError: ts-loader was supplied with an unexpected loader option: notRealOption/n/nPlease take a look at the options you are supplying; the following are valid options:/nsilent / logLevel / logInfoToStdOut / instance / compiler / context / configFile / transpileOnly / ignoreDiagnostics / errorFormatter / colors / compilerOptions / appendTsSuffixTo / appendTsxSuffixTo / onlyCompileBundledFiles / happyPackMode / getCustomTransformers / reportFiles / experimentalWatchApi / allowTsInNodeModules / experimentalFileCaching / projectReferences / resolveModuleName/n/n    at validateLoaderOptions (C://source//ts-loader//dist//index.js:152:19)/n    at getLoaderOptions (C://source//ts-loader//dist//index.js:110:5)/n    at Object.loader (C://source//ts-loader//dist//index.js:16:21)\");\n\n//# sourceURL=webpack:///./app.ts?");
 
 /***/ })
 

test/comparison-tests/validateLoaderOptionNames/expectedOutput-3.1/output.txt

@@ -1,15 +1,15 @@
-    Asset      Size  Chunks             Chunk Names
-bundle.js  4.58 KiB    main  [emitted]  main
+    Asset     Size  Chunks             Chunk Names
+bundle.js  4.6 KiB    main  [emitted]  main
 Entrypoint main = bundle.js
-[./app.ts] 835 bytes {main} [built] [failed] [1 error]
+[./app.ts] 855 bytes {main} [built] [failed] [1 error]
 
 ERROR in ./app.ts
 Module build failed (from /index.js):
 Error: ts-loader was supplied with an unexpected loader option: notRealOption
 
 Please take a look at the options you are supplying; the following are valid options:
-silent / logLevel / logInfoToStdOut / instance / compiler / context / configFile / transpileOnly / ignoreDiagnostics / errorFormatter / colors / compilerOptions / appendTsSuffixTo / appendTsxSuffixTo / onlyCompileBundledFiles / happyPackMode / getCustomTransformers / reportFiles / experimentalWatchApi / allowTsInNodeModules / experimentalFileCaching / projectReferences
+silent / logLevel / logInfoToStdOut / instance / compiler / context / configFile / transpileOnly / ignoreDiagnostics / errorFormatter / colors / compilerOptions / appendTsSuffixTo / appendTsxSuffixTo / onlyCompileBundledFiles / happyPackMode / getCustomTransformers / reportFiles / experimentalWatchApi / allowTsInNodeModules / experimentalFileCaching / projectReferences / resolveModuleName
 
-    at validateLoaderOptions (dist\index.js:151:19)
+    at validateLoaderOptions (dist\index.js:152:19)
     at getLoaderOptions (dist\index.js:110:5)
     at Object.loader (dist\index.js:16:21)

test/execution-tests/3.0.1_resolveModuleName/bar-pkg/index.d.ts

@@ -0,0 +1,3 @@
+import {HelloWorld} from 'foo';
+
+export type HelloBuilder = (hello: number, world: number) => HelloWorld;

test/execution-tests/3.0.1_resolveModuleName/bar-pkg/package.json

@@ -0,0 +1,5 @@
+{
+    "name": "bar",
+    "version": "1.0.0",
+    "typings": "./index.d.ts"
+}

test/execution-tests/3.0.1_resolveModuleName/baz-pkg/index.d.ts

@@ -0,0 +1,3 @@
+import {HelloBuilder} from 'bar';
+
+export declare const makeHello: HelloBuilder;

test/execution-tests/3.0.1_resolveModuleName/baz-pkg/index.js

@@ -0,0 +1,4 @@
+export const makeHello = (hello, world) => ({
+  hello,
+  world,
+});

test/execution-tests/3.0.1_resolveModuleName/baz-pkg/package.json

@@ -0,0 +1,5 @@
+{
+    "name": "baz",
+    "version": "1.0.0",
+    "main": "index.ts"
+}

test/execution-tests/3.0.1_resolveModuleName/foo-pkg/index.d.ts

@@ -0,0 +1,4 @@
+export type HelloWorld = {
+  hello: number,
+  world: number,
+};

test/execution-tests/3.0.1_resolveModuleName/foo-pkg/package.json

@@ -0,0 +1,5 @@
+{
+    "name": "foo",
+    "version": "1.0.0",
+    "typings": "./index.d.ts"
+}

test/execution-tests/3.0.1_resolveModuleName/karma.conf.js

@@ -0,0 +1,47 @@
+/* eslint-disable no-var, strict */
+'use strict';
+var path = require('path');
+var webpack = require('webpack');
+var webpackConfig = require('./webpack.config.js');
+var reporterOptions = require('../../reporterOptions');
+
+module.exports = function(config) {
+  config.set({
+    browsers: [ 'ChromeHeadless' ],
+
+    files: [
+      // This loads all the tests
+      'main.js'
+    ],
+
+    port: 9876,
+
+    frameworks: [ 'jasmine' ],
+
+    logLevel: config.LOG_INFO, //config.LOG_DEBUG
+
+    preprocessors: {
+      'main.js': [ 'webpack', 'sourcemap' ]
+    },
+
+    webpack: {
+      devtool: 'inline-source-map',
+      mode: webpackConfig.mode,
+      module: webpackConfig.module,
+      resolve: webpackConfig.resolve,
+
+      // for test harness purposes only, you would not need this in a normal project
+      resolveLoader: webpackConfig.resolveLoader
+    },
+
+    webpackMiddleware: {
+      quiet: true,
+      stats: {
+        colors: true
+      }
+    },
+
+    // reporter options
+    mochaReporter: reporterOptions
+  });
+};

test/execution-tests/3.0.1_resolveModuleName/main.js

@@ -0,0 +1,2 @@
+const testsContext = require.context('./', true, /\.tests\.ts(x?)$/);
+testsContext.keys().forEach(testsContext);

test/execution-tests/3.0.1_resolveModuleName/package.json

@@ -0,0 +1,10 @@
+{
+  "name": "basic",
+  "license": "MIT",
+  "version": "1.0.0",
+  "main": "index.js",
+  "devDependencies": {
+    "@types/jasmine": "^2.5.35",
+    "jasmine-core": "^2.3.4"
+  }
+}

test/execution-tests/3.0.1_resolveModuleName/src/app.ts

@@ -0,0 +1,4 @@
+import {HelloWorld} from 'foo';
+import {makeHello}  from 'baz';
+
+export const def: HelloWorld = makeHello(1, 2);

test/execution-tests/3.0.1_resolveModuleName/test/app.tests.ts

@@ -0,0 +1,8 @@
+import * as app from '../src/app';
+
+describe("app", () => {
+  it("app.def to have been setup", () => {
+    expect(app.def.hello).toEqual(1);
+    expect(app.def.world).toEqual(2);
+  });
+});

test/execution-tests/3.0.1_resolveModuleName/tsconfig.json

@@ -0,0 +1,5 @@
+{
+	"compilerOptions": {
+		"noEmitOnError": true
+	}
+}

test/execution-tests/3.0.1_resolveModuleName/webpack.config.js

@@ -0,0 +1,30 @@
+var path = require('path')
+
+module.exports = {
+    mode: 'development',
+    entry: './app.ts',
+    output: {
+        filename: 'bundle.js'
+    },
+    resolve: {
+        extensions: ['.ts', '.js'],
+        alias: { baz: path.join(__dirname, 'baz-pkg') },
+    },
+    module: {
+        rules: [
+            { test: /\.ts$/, loader: 'ts-loader', options: {
+                resolveModuleName: (moduleName, containingFile, compilerOptions, compilerHost, parentResolver) => {
+                    switch (moduleName) {
+                        case 'foo': return parentResolver(path.join(__dirname, 'foo-pkg'), containingFile, compilerOptions, compilerHost);
+                        case 'bar': return parentResolver(path.join(__dirname, 'bar-pkg'), containingFile, compilerOptions, compilerHost);
+                        case 'baz': return parentResolver(path.join(__dirname, 'baz-pkg'), containingFile, compilerOptions, compilerHost);
+                        default: return parentResolver(moduleName, containingFile, compilerOptions, compilerHost);
+                    }
+                },
+            } }
+        ]
+    }
+}
+
+// for test harness purposes only, you would not need this in a normal project
+module.exports.resolveLoader = { alias: { 'ts-loader': path.join(__dirname, "../../../index.js") } }

test/execution-tests/3.0.1_resolveModuleName/yarn.lock

@@ -0,0 +1,11 @@
+# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@types/jasmine@^2.5.35":
+  version "2.8.5"
+  resolved "https://registry.yarnpkg.com/@types/jasmine/-/jasmine-2.8.5.tgz#96e58872583fa80c7ea0dd29024b180d5e133678"
+
+jasmine-core@^2.3.4:
+  version "2.9.1"
+  resolved "https://registry.yarnpkg.com/jasmine-core/-/jasmine-core-2.9.1.tgz#b6bbc1d8e65250d56f5888461705ebeeeb88f22f"