Add css-loader 4 support

.travis.yml

@@ -1,6 +1,17 @@
 language: node_js
+
 node_js:
   - "10"
+
 branches:
   only:
     - master
+
+jobs:
+  include:
+    - install: npm ci
+    - install: npm install --no-shrinkwrap
+
+before_script:
+  - npm ls css-loader
+  - npm ls typescript

package.json

@@ -27,7 +27,8 @@
   },
   "devDependencies": {
     "@types/jest": "^24.0.23",
-    "css-loader": "^3.1.0",
+    "css-loader": "*",
+    "css-loader3": "npm:css-loader@^3.1.0",
     "eslint": "4.18.2",
     "eslint-config-prettier": "^6.0.0",
     "jest": "^24.9.0",

src/index.js

@@ -3,7 +3,7 @@ const {
   filenameToPascalCase,
   filenameToTypingsFilename,
   getCssModuleKeys,
-  generateGenericExportInterface
+  generateGenericExportInterface,
 } = require("./utils");
 const persist = require("./persist");
 const verify = require("./verify");
@@ -16,39 +16,38 @@ const schema = {
     eol: {
       description:
         "Newline character to be used in generated d.ts files. Uses OS default. This option is overridden by the formatter option.",
-      type: "string"
+      type: "string",
     },
     banner: {
       description: "To add a 'banner' prefix to each generated `*.d.ts` file",
-      type: "string"
+      type: "string",
     },
     formatter: {
       description:
         "Possible options: none and prettier (requires prettier package installed). Defaults to prettier if `prettier` module can be resolved",
-      enum: ["prettier", "none"]
+      enum: ["prettier", "none"],
     },
     disableLocalsExport: {
-      description:
-        "Disable the use of locals export. Defaults to `false`",
-      type: "boolean"
+      description: "Disable the use of locals export. Defaults to `false`",
+      type: "boolean",
     },
     verifyOnly: {
       description:
         "Validate generated `*.d.ts` files and fail if an update is needed (useful in CI). Defaults to `false`",
-      type: "boolean"
-    }
+      type: "boolean",
+    },
   },
-  additionalProperties: false
+  additionalProperties: false,
 };
 
 /** @type {any} */
 const configuration = {
   name: "typings-for-css-modules-loader",
-  baseDataPath: "options"
+  baseDataPath: "options",
 };
 
 /** @type {((this: import('webpack').loader.LoaderContext, ...args: any[]) => void) & {pitch?: import('webpack').loader.Loader['pitch']}} */
-module.exports = function(content, ...args) {
+module.exports = function (content, ...args) {
   const options = getOptions(this) || {};
 
   validateOptions(schema, options, configuration);
@@ -58,9 +57,12 @@ module.exports = function(content, ...args) {
   }
 
   // let's only check `exports.locals` for keys to avoid getting keys from the sourcemap when it's enabled
-  const cssModuleKeys = getCssModuleKeys(
-    content.substring(content.indexOf("exports.locals"))
-  );
+  // if we cannot find locals, then the module only contains global styles
+  const indexOfLocals = content.indexOf(".locals");
+  const cssModuleKeys =
+    indexOfLocals === -1
+      ? []
+      : getCssModuleKeys(content.substring(indexOfLocals));
 
   /** @type {any} */
   const callback = this.async();
@@ -85,14 +87,14 @@ module.exports = function(content, ...args) {
   );
 
   applyFormattingAndOptions(cssModuleDefinition, options)
-    .then(output => {
+    .then((output) => {
       if (options.verifyOnly === true) {
         return verify(cssModuleInterfaceFilename, output);
       } else {
         persist(cssModuleInterfaceFilename, output);
       }
     })
-    .catch(err => {
+    .catch((err) => {
       this.emitError(err);
     })
     .then(successfulCallback);
@@ -132,7 +134,7 @@ async function applyPrettier(input) {
   const prettier = require("prettier");
 
   const config = await prettier.resolveConfig("./", {
-    editorconfig: true
+    editorconfig: true,
   });
 
   return prettier.format(

src/utils.js

@@ -6,7 +6,7 @@ const camelCase = require("camelcase");
  * @param {string} content
  * @returns {string[]}
  */
-const getCssModuleKeys = content => {
+const getCssModuleKeys = (content) => {
   const keyRegex = /"([\w-]+)":/g;
   let match;
   const cssModuleKeys = [];
@@ -22,7 +22,7 @@ const getCssModuleKeys = content => {
 /**
  * @param {string} filename
  */
-const filenameToPascalCase = filename => {
+const filenameToPascalCase = (filename) => {
   return camelCase(path.basename(filename), { pascalCase: true });
 };
 
@@ -33,11 +33,11 @@ const filenameToPascalCase = filename => {
 const cssModuleToTypescriptInterfaceProperties = (cssModuleKeys, indent) => {
   return [...cssModuleKeys]
     .sort()
-    .map(key => `${indent || ""}'${key}': string;`)
+    .map((key) => `${indent || ""}'${key}': string;`)
     .join("\n");
 };
 
-const filenameToTypingsFilename = filename => {
+const filenameToTypingsFilename = (filename) => {
   const dirName = path.dirname(filename);
   const baseName = path.basename(filename);
   return path.join(dirName, `${baseName}.d.ts`);
@@ -47,12 +47,18 @@ const filenameToTypingsFilename = filename => {
  * @param {string[]} cssModuleKeys
  * @param {string} pascalCaseFileName
  */
-const generateGenericExportInterface = (cssModuleKeys, pascalCaseFileName, disableLocalsExport) => {
+const generateGenericExportInterface = (
+  cssModuleKeys,
+  pascalCaseFileName,
+  disableLocalsExport
+) => {
   const interfaceName = `I${pascalCaseFileName}`;
   const moduleName = `${pascalCaseFileName}Module`;
   const namespaceName = `${pascalCaseFileName}Namespace`;
 
-  const localsExportType = disableLocalsExport ? `` : ` & {
+  const localsExportType = disableLocalsExport
+    ? ``
+    : ` & {
   /** WARNING: Only available when \`css-loader\` is used without \`style-loader\` or \`mini-css-extract-plugin\` */
   locals: ${namespaceName}.${interfaceName};
 }`;
@@ -76,5 +82,5 @@ module.exports = {
   getCssModuleKeys,
   filenameToPascalCase,
   filenameToTypingsFilename,
-  generateGenericExportInterface
+  generateGenericExportInterface,
 };

src/verify.js

@@ -1,6 +1,6 @@
 // @ts-check
-const fs = require('fs');
-const util = require('util');
+const fs = require("fs");
+const util = require("util");
 const fsStat = util.promisify(fs.stat);
 const fsReadFile = util.promisify(fs.readFile);
 /**
@@ -10,18 +10,23 @@ const fsReadFile = util.promisify(fs.readFile);
  */
 module.exports = async (filename, content) => {
   const fileExists = await fsStat(filename)
-    .then(() => true).catch(() => false);
+    .then(() => true)
+    .catch(() => false);
 
   if (!fileExists) {
-    throw new Error(`Verification failed: Generated typings for css-module file '${filename}' is not found. ` +
-      "It typically happens when the generated typings were not committed.");
+    throw new Error(
+      `Verification failed: Generated typings for css-module file '${filename}' is not found. ` +
+        "It typically happens when the generated typings were not committed."
+    );
   }
 
-  const existingFileContent = await fsReadFile(filename, 'utf-8');
+  const existingFileContent = await fsReadFile(filename, "utf-8");
 
   // let's not fail the build if there are whitespace changes only
   if (existingFileContent.replace(/\s+/g, "") !== content.replace(/\s+/g, "")) {
-    throw new Error(`Verification failed: Generated typings for css-modules file '${filename}' is out of date. ` +
-      "It typically happens when the up-to-date generated typings are not committed.");
+    throw new Error(
+      `Verification failed: Generated typings for css-modules file '${filename}' is out of date. ` +
+        "It typically happens when the up-to-date generated typings are not committed."
+    );
   }
 };