# WIP fix for issues with typescript default import

Author: Obi-Dann

examples/ts-loader-example/package-lock.json

@@ -0,0 +1,16 @@
+{
+  "name": "@teamsupercell/typings-for-css-modules-loader-ts-loader-example",
+  "scripts": {
+    "build": "jest"
+  },
+  "author": "dannsam",
+  "license": "MIT",
+  "devDependencies": {
+    "@teamsupercell/typings-for-css-modules-loader": "^2.0.0",
+    "css-loader": "^3.1.0",
+    "ts-loader": "^6.2.1",
+    "typescript": "^3.5.3",
+    "webpack": "^4.39.1",
+    "webpack-cli": "^3.3.10"
+  }
+}

examples/ts-loader-example/package.json

@@ -0,0 +1,3 @@
+.shared-style {
+  color: black;
+}

examples/ts-loader-example/src/example-shared.css

@@ -0,0 +1,11 @@
+.foo {
+  color: white;
+}
+
+.bar-baz {
+  color: green;
+}
+
+.composed {
+  composes: shared-style from "./example-shared.css";
+}

examples/ts-loader-example/src/example.css

@@ -0,0 +1,7 @@
+import styles from "./example.css";
+import { IExampleCss } from "./example.css";
+
+const reassignedStyles: IExampleCss = styles;
+
+console.log(styles.composed);
+console.log(reassignedStyles.composed);

examples/ts-loader-example/src/exports-default.ts

@@ -0,0 +1,7 @@
+import * as styles from "./example.css";
+import { IExampleCss } from "./example.css";
+
+const reassignedStyles: IExampleCss = styles;
+
+console.log(styles.composed);
+console.log(reassignedStyles.composed);

examples/ts-loader-example/src/exports-module.ts

@@ -0,0 +1,2 @@
+import './exports-default';
+import './exports-module';

examples/ts-loader-example/src/index.ts

@@ -0,0 +1,67 @@
+{
+  "compilerOptions": {
+    /* Basic Options */
+    // "incremental": true,                   /* Enable incremental compilation */
+    "target": "es2015",                          /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */
+    "module": "commonjs",                     /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */
+    // "lib": [],                             /* Specify library files to be included in the compilation. */
+    // "allowJs": true,                       /* Allow javascript files to be compiled. */
+    // "checkJs": true,                       /* Report errors in .js files. */
+    // "jsx": "preserve",                     /* Specify JSX code generation: 'preserve', 'react-native', or 'react'. */
+    // "declaration": true,                   /* Generates corresponding '.d.ts' file. */
+    // "declarationMap": true,                /* Generates a sourcemap for each corresponding '.d.ts' file. */
+    // "sourceMap": true,                     /* Generates corresponding '.map' file. */
+    // "outFile": "./",                       /* Concatenate and emit output to single file. */
+    // "outDir": "./",                        /* Redirect output structure to the directory. */
+    // "rootDir": "./",                       /* Specify the root directory of input files. Use to control the output directory structure with --outDir. */
+    // "composite": true,                     /* Enable project compilation */
+    // "tsBuildInfoFile": "./",               /* Specify file to store incremental compilation information */
+    // "removeComments": true,                /* Do not emit comments to output. */
+    // "noEmit": true,                        /* Do not emit outputs. */
+    // "importHelpers": true,                 /* Import emit helpers from 'tslib'. */
+    // "downlevelIteration": true,            /* Provide full support for iterables in 'for-of', spread, and destructuring when targeting 'ES5' or 'ES3'. */
+    // "isolatedModules": true,               /* Transpile each file as a separate module (similar to 'ts.transpileModule'). */
+
+    /* Strict Type-Checking Options */
+    "strict": true,                           /* Enable all strict type-checking options. */
+    // "noImplicitAny": true,                 /* Raise error on expressions and declarations with an implied 'any' type. */
+    // "strictNullChecks": true,              /* Enable strict null checks. */
+    // "strictFunctionTypes": true,           /* Enable strict checking of function types. */
+    // "strictBindCallApply": true,           /* Enable strict 'bind', 'call', and 'apply' methods on functions. */
+    // "strictPropertyInitialization": true,  /* Enable strict checking of property initialization in classes. */
+    // "noImplicitThis": true,                /* Raise error on 'this' expressions with an implied 'any' type. */
+    // "alwaysStrict": true,                  /* Parse in strict mode and emit "use strict" for each source file. */
+
+    /* Additional Checks */
+    // "noUnusedLocals": true,                /* Report errors on unused locals. */
+    // "noUnusedParameters": true,            /* Report errors on unused parameters. */
+    // "noImplicitReturns": true,             /* Report error when not all code paths in function return a value. */
+    // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
+
+    /* Module Resolution Options */
+    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
+    // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
+    // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */
+    // "typeRoots": [],                       /* List of folders to include type definitions from. */
+    // "types": [],                           /* Type declaration files to be included in compilation. */
+    // "allowSyntheticDefaultImports": true,  /* Allow default imports from modules with no default export. This does not affect code emit, just typechecking. */
+    "esModuleInterop": true,                  /* Enables emit interoperability between CommonJS and ES Modules via creation of namespace objects for all imports. Implies 'allowSyntheticDefaultImports'. */
+    // "preserveSymlinks": true,              /* Do not resolve the real path of symlinks. */
+    // "allowUmdGlobalAccess": true,          /* Allow accessing UMD globals from modules. */
+
+    /* Source Map Options */
+    // "sourceRoot": "",                      /* Specify the location where debugger should locate TypeScript files instead of source locations. */
+    // "mapRoot": "",                         /* Specify the location where debugger should locate map files instead of generated locations. */
+    // "inlineSourceMap": true,               /* Emit a single file with source maps instead of having a separate file. */
+    // "inlineSources": true,                 /* Emit the source alongside the sourcemaps within a single file; requires '--inlineSourceMap' or '--sourceMap' to be set. */
+
+    /* Experimental Options */
+    // "experimentalDecorators": true,        /* Enables experimental support for ES7 decorators. */
+    // "emitDecoratorMetadata": true,         /* Enables experimental support for emitting type metadata for decorators. */
+
+    /* Advanced Options */
+    "forceConsistentCasingInFileNames": true  /* Disallow inconsistently-cased references to the same file. */
+  },
+  "include": ["./src/**/*"]
+}

examples/ts-loader-example/tsconfig.json

@@ -0,0 +1,33 @@
+module.exports = {
+  entry: "./src/index.ts",
+  target: "node",
+  resolve: {
+    // Add `.ts` and `.tsx` as a resolvable extension.
+    extensions: [".ts", ".tsx", ".js", ".css"]
+  },
+  module: {
+    rules: [
+      {
+        test: /\.css$/,
+        use: [
+          {
+            loader: "@teamsupercell/typings-for-css-modules-loader",
+            options: {
+              formatter: "prettier"
+            }
+          },
+          {
+            loader: "css-loader",
+            options: { modules: true }
+          }
+        ]
+      },
+      {
+        test: /\.tsx?$/,
+        use: "ts-loader",
+        exclude: /node_modules/
+      }
+    ]
+  },
+  mode: "none"
+};

examples/ts-loader-example/webpack.config.js

@@ -0,0 +1,7 @@
+{
+  "packages": [
+    ".",
+    "examples/*"
+  ],
+  "version": "0.0.0"
+}

lerna.json

@@ -1,6 +1,6 @@
 // @ts-check
 const {
-  filenameToInterfaceName,
+  filenameToPascalCase,
   filenameToTypingsFilename,
   getCssModuleKeys,
   generateGenericExportInterface
@@ -67,10 +67,9 @@ module.exports = function(content, ...args) {
   const filename = this.resourcePath;
 
   const cssModuleInterfaceFilename = filenameToTypingsFilename(filename);
-  const interfaceName = filenameToInterfaceName(filename);
   const cssModuleDefinition = generateGenericExportInterface(
     cssModuleKeys,
-    interfaceName
+    filenameToPascalCase(filename)
   );
 
   applyFormattingAndOptions(cssModuleDefinition, options)

src/index.js

@@ -22,17 +22,18 @@ const getCssModuleKeys = content => {
 /**
  * @param {string} filename
  */
-const filenameToInterfaceName = filename => {
-  return "I" + camelCase(path.basename(filename), { pascalCase: true });
+const filenameToPascalCase = filename => {
+  return camelCase(path.basename(filename), { pascalCase: true });
 };
 
 /**
  * @param {string[]} cssModuleKeys
+ * @param {string=} indent
  */
-const cssModuleToTypescriptInterfaceProperties = cssModuleKeys => {
+const cssModuleToTypescriptInterfaceProperties = (cssModuleKeys, indent) => {
   return [...cssModuleKeys]
     .sort()
-    .map(key => `  '${key}': string;`)
+    .map(key => `${indent || ""}'${key}': string;`)
     .join("\n");
 };
 
@@ -44,23 +45,33 @@ const filenameToTypingsFilename = filename => {
 
 /**
  * @param {string[]} cssModuleKeys
- * @param {string} interfaceName
+ * @param {string} pascalCaseFileName
  */
-const generateGenericExportInterface = (cssModuleKeys, interfaceName) => {
+const generateGenericExportInterface = (cssModuleKeys, pascalCaseFileName) => {
+  const interfaceName = `I${pascalCaseFileName}`;
+  const moduleName = `${pascalCaseFileName}Module`;
+
   const interfaceProperties = cssModuleToTypescriptInterfaceProperties(
-    cssModuleKeys
+    cssModuleKeys,
+    "    "
   );
-  return `export interface ${interfaceName} {
+  return `declare namespace ${moduleName} {
+  export interface I${pascalCaseFileName} {
 ${interfaceProperties}
+  }
 }
 
-export const locals: ${interfaceName};
-export default locals;`;
+declare const ${moduleName}: ${moduleName}.${interfaceName} & {
+  /** WARNING: Only available when \`css-loader\` is used without \`style-loader\` or \`mini-css-extract-plugin\` */
+  locals: ${moduleName}.${interfaceName};
+};
+
+export = ${moduleName};`;
 };
 
 module.exports = {
   getCssModuleKeys,
-  filenameToInterfaceName,
+  filenameToPascalCase,
   filenameToTypingsFilename,
   generateGenericExportInterface
 };