feat: allow named exports to have underscores in names

src/utils.js

@@ -111,6 +111,14 @@ function getFilter(filter, resourcePath) {
   };
 }
 
+function getValidLocalName(localName, exportLocalsConvention) {
+  if (exportLocalsConvention === 'dashesOnly') {
+    return dashesCamelCase(localName);
+  }
+
+  return camelCase(localName);
+}
+
 const moduleRegExp = /\.module(s)?\.\w+$/i;
 const icssRegExp = /\.icss\.\w+$/i;
 
@@ -203,9 +211,12 @@ function getModulesOptions(rawOptions, loaderContext) {
       );
     }
 
-    if (modulesOptions.exportLocalsConvention !== 'camelCaseOnly') {
+    if (
+      modulesOptions.exportLocalsConvention !== 'camelCaseOnly' &&
+      modulesOptions.exportLocalsConvention !== 'dashesOnly'
+    ) {
       throw new Error(
-        'The "modules.namedExport" option requires the "modules.exportLocalsConvention" option to be "camelCaseOnly"'
+        'The "modules.namedExport" option requires the "modules.exportLocalsConvention" option to be "camelCaseOnly" or "dashesOnly"'
       );
     }
   }
@@ -516,7 +527,10 @@ function getModuleCode(result, api, replacements, options, loaderContext) {
       code = code.replace(new RegExp(replacementName, 'g'), () =>
         options.modules.namedExport
           ? `" + ${importName}_NAMED___[${JSON.stringify(
-              camelCase(localName)
+              getValidLocalName(
+                localName,
+                options.modules.exportLocalsConvention
+              )
             )}] + "`
           : `" + ${importName}.locals[${JSON.stringify(localName)}] + "`
       );
@@ -551,9 +565,7 @@ function getExportCode(exports, replacements, options) {
 
   const addExportToLocalsCode = (name, value) => {
     if (options.modules.namedExport) {
-      localsCode += `export const ${camelCase(name)} = ${JSON.stringify(
-        value
-      )};\n`;
+      localsCode += `export const ${name} = ${JSON.stringify(value)};\n`;
     } else {
       if (localsCode) {
         localsCode += `,\n`;
@@ -609,7 +621,7 @@ function getExportCode(exports, replacements, options) {
       localsCode = localsCode.replace(new RegExp(replacementName, 'g'), () => {
         if (options.modules.namedExport) {
           return `" + ${importName}_NAMED___[${JSON.stringify(
-            camelCase(localName)
+            getValidLocalName(localName, options.modules.exportLocalsConvention)
           )}] + "`;
         } else if (options.modules.exportOnlyLocals) {
           return `" + ${importName}[${JSON.stringify(localName)}] + "`;

test/__snapshots__/modules-option.test.js.snap

@@ -1614,7 +1614,7 @@ exports[`"modules" option should throw an error when class has unsupported name
 exports[`"modules" option should throw an error when the "namedExport" is enabled and the "exportLocalsConvention" options has not "camelCaseOnly" value: errors 1`] = `
 Array [
   "ModuleBuildError: Module build failed (from \`replaced original path\`):
-Error: The \\"modules.namedExport\\" option requires the \\"modules.exportLocalsConvention\\" option to be \\"camelCaseOnly\\"",
+Error: The \\"modules.namedExport\\" option requires the \\"modules.exportLocalsConvention\\" option to be \\"camelCaseOnly\\" or \\"dashesOnly\\"",
 ]
 `;
 
@@ -1629,6 +1629,15 @@ Error: The \\"modules.namedExport\\" option requires the \\"esModules\\" option
 
 exports[`"modules" option should throw an error when the "namedExport" option is "true", but the "esModule" is "false": warnings 1`] = `Array []`;
 
+exports[`"modules" option should throw error with composes when the "namedExport" is enabled and "exportLocalsConvention" options has invalid value: errors 1`] = `
+Array [
+  "ModuleBuildError: Module build failed (from \`replaced original path\`):
+Error: The \\"modules.namedExport\\" option requires the \\"modules.exportLocalsConvention\\" option to be \\"camelCaseOnly\\" or \\"dashesOnly\\"",
+]
+`;
+
+exports[`"modules" option should throw error with composes when the "namedExport" is enabled and "exportLocalsConvention" options has invalid value: warnings 1`] = `Array []`;
+
 exports[`"modules" option should work and correctly replace escaped symbols: errors 1`] = `Array []`;
 
 exports[`"modules" option should work and correctly replace escaped symbols: module 1`] = `
@@ -3719,6 +3728,39 @@ Object {
 
 exports[`"modules" option should work js template with "namedExport" option: warnings 1`] = `Array []`;
 
+exports[`"modules" option should work when the "namedExport" is enabled and the "exportLocalsConvention" options has "dashesOnly" value: errors 1`] = `Array []`;
+
+exports[`"modules" option should work when the "namedExport" is enabled and the "exportLocalsConvention" options has "dashesOnly" value: module 1`] = `
+"// Imports
+import ___CSS_LOADER_API_IMPORT___ from \\"../../../../../src/runtime/api.js\\";
+var ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(function(i){return i[1]});
+// Module
+___CSS_LOADER_EXPORT___.push([module.id, \\".foo_barBaz {\\\\n  color: red;\\\\n}\\\\n\\\\n.bar {\\\\n  color: red;\\\\n}\\\\n\\", \\"\\"]);
+// Exports
+export const foo_barBaz = \\"foo_barBaz\\";
+export default ___CSS_LOADER_EXPORT___;
+"
+`;
+
+exports[`"modules" option should work when the "namedExport" is enabled and the "exportLocalsConvention" options has "dashesOnly" value: result 1`] = `
+Array [
+  Array [
+    "./modules/namedExport/dashesOnly/index.css",
+    ".foo_barBaz {
+  color: red;
+}
+
+.bar {
+  color: red;
+}
+",
+    "",
+  ],
+]
+`;
+
+exports[`"modules" option should work when the "namedExport" is enabled and the "exportLocalsConvention" options has "dashesOnly" value: warnings 1`] = `Array []`;
+
 exports[`"modules" option should work with "exportOnlyLocals" and "esModule" with "false" value options: errors 1`] = `Array []`;
 
 exports[`"modules" option should work with "exportOnlyLocals" and "esModule" with "false" value options: module 1`] = `
@@ -12152,6 +12194,67 @@ Array [
 
 exports[`"modules" option should work with case \`values-10\` (\`modules\` value is \`true)\`: warnings 1`] = `Array []`;
 
+exports[`"modules" option should work with composes when the "namedExport" is enabled and "exportLocalsConvention" options has "dashesOnly" value: errors 1`] = `Array []`;
+
+exports[`"modules" option should work with composes when the "namedExport" is enabled and "exportLocalsConvention" options has "dashesOnly" value: module 1`] = `
+"// Imports
+import ___CSS_LOADER_API_IMPORT___ from \\"../../../../../src/runtime/api.js\\";
+import ___CSS_LOADER_ICSS_IMPORT_0___, * as ___CSS_LOADER_ICSS_IMPORT_0____NAMED___ from \\"-!../../../../../src/index.js??[ident]!./values.css\\";
+var ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(function(i){return i[1]});
+___CSS_LOADER_EXPORT___.i(___CSS_LOADER_ICSS_IMPORT_0___, \\"\\", true);
+// Module
+___CSS_LOADER_EXPORT___.push([module.id, \\"._ghi {\\\\n  color: \\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"v_def\\"] + \\";\\\\n}\\\\n\\\\n._my-class {\\\\n  color: \\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"sWhite\\"] + \\";\\\\n}\\\\n\\\\n._other {\\\\n  display: \\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"mSmall\\"] + \\";\\\\n}\\\\n\\\\n._other-other {\\\\n  width: \\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"v_def\\"] + \\";\\\\n}\\\\n\\\\n._green {\\\\n  color: \\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"v_otherOther\\"] + \\";\\\\n}\\\\n\\", \\"\\"]);
+// Exports
+export const v_def = \\"\\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"v_def\\"] + \\"\\";
+export const v_otherOther = \\"\\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"v_otherOther\\"] + \\"\\";
+export const sWhite = \\"\\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"sWhite\\"] + \\"\\";
+export const mSmall = \\"\\" + ___CSS_LOADER_ICSS_IMPORT_0____NAMED___[\\"mSmall\\"] + \\"\\";
+export const ghi = \\"_ghi\\";
+export const myClass = \\"_my-class\\";
+export const other = \\"_other\\";
+export const otherOther = \\"_other-other\\";
+export const green = \\"_green\\";
+export default ___CSS_LOADER_EXPORT___;
+"
+`;
+
+exports[`"modules" option should work with composes when the "namedExport" is enabled and "exportLocalsConvention" options has "dashesOnly" value: result 1`] = `
+Array [
+  Array [
+    "../../src/index.js?[ident]!./modules/namedExport/composes/values.css",
+    "
+",
+    "",
+  ],
+  Array [
+    "./modules/namedExport/composes/composes.css",
+    "._ghi {
+  color: red;
+}
+
+._my-class {
+  color: white;
+}
+
+._other {
+  display: (min-width: 320px);
+}
+
+._other-other {
+  width: red;
+}
+
+._green {
+  color: green;
+}
+",
+    "",
+  ],
+]
+`;
+
+exports[`"modules" option should work with composes when the "namedExport" is enabled and "exportLocalsConvention" options has "dashesOnly" value: warnings 1`] = `Array []`;
+
 exports[`"modules" option should work with the "[local]" placeholder for the "localIdentName" option: errors 1`] = `Array []`;
 
 exports[`"modules" option should work with the "[local]" placeholder for the "localIdentName" option: module 1`] = `

test/fixtures/modules/namedExport/composes/composes.css

@@ -0,0 +1,24 @@
+@value v_def from './values.css';
+@value v_other-other from './values.css';
+@value s-white from './values.css';
+@value m-small from './values.css';
+
+.ghi {
+  color: v_def;
+}
+
+.my-class {
+  color: s-white;
+}
+
+.other {
+  display: m-small;
+}
+
+.other-other {
+  width: v_def;
+}
+
+.green {
+  color: v_other-other;
+}

test/fixtures/modules/namedExport/composes/composes.js

@@ -0,0 +1,5 @@
+import css from './composes.css';
+
+__export__ = css;
+
+export default css;

test/fixtures/modules/namedExport/composes/values.css

@@ -0,0 +1,4 @@
+@value v_def: red;
+@value v_other-other: green;
+@value s-white: white;
+@value m-small: (min-width: 320px);

test/fixtures/modules/namedExport/dashesOnly/index.css

@@ -0,0 +1,7 @@
+:local(.foo_barBaz) {
+  color: red;
+}
+
+:global(.bar) {
+  color: red;
+}

test/fixtures/modules/namedExport/dashesOnly/index.js

@@ -0,0 +1,5 @@
+import css from './index.css';
+
+__export__ = css;
+
+export default css;

test/modules-option.test.js

@@ -1203,6 +1203,60 @@ describe('"modules" option', () => {
     expect(getErrors(stats)).toMatchSnapshot('errors');
   });
 
+  it('should work when the "namedExport" is enabled and the "exportLocalsConvention" options has "dashesOnly" value', async () => {
+    const compiler = getCompiler('./modules/namedExport/dashesOnly/index.js', {
+      modules: {
+        localIdentName: '[local]',
+        namedExport: true,
+        exportLocalsConvention: 'dashesOnly',
+      },
+    });
+    const stats = await compile(compiler);
+
+    expect(
+      getModuleSource('./modules/namedExport/dashesOnly/index.css', stats)
+    ).toMatchSnapshot('module');
+    expect(getExecutedCode('main.bundle.js', compiler, stats)).toMatchSnapshot(
+      'result'
+    );
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+    expect(getErrors(stats, true)).toMatchSnapshot('errors');
+  });
+
+  it('should work with composes when the "namedExport" is enabled and "exportLocalsConvention" options has "dashesOnly" value', async () => {
+    const compiler = getCompiler('./modules/namedExport/composes/composes.js', {
+      modules: {
+        localIdentName: '_[local]',
+        namedExport: true,
+        exportLocalsConvention: 'dashesOnly',
+      },
+    });
+    const stats = await compile(compiler);
+
+    expect(
+      getModuleSource('./modules/namedExport/composes/composes.css', stats)
+    ).toMatchSnapshot('module');
+    expect(getExecutedCode('main.bundle.js', compiler, stats)).toMatchSnapshot(
+      'result'
+    );
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+    expect(getErrors(stats)).toMatchSnapshot('errors');
+  });
+
+  it('should throw error with composes when the "namedExport" is enabled and "exportLocalsConvention" options has invalid value', async () => {
+    const compiler = getCompiler('./modules/namedExport/composes/composes.js', {
+      modules: {
+        localIdentName: '_[local]',
+        namedExport: true,
+        exportLocalsConvention: 'dashes',
+      },
+    });
+    const stats = await compile(compiler);
+
+    expect(getWarnings(stats)).toMatchSnapshot('warnings');
+    expect(getErrors(stats, true)).toMatchSnapshot('errors');
+  });
+
   it('should throw an error when the "namedExport" option is "true", but the "esModule" is "false"', async () => {
     const compiler = getCompiler('./modules/namedExport/base/index.js', {
       esModule: false,