feat: allow to extend conditionNames (#488)

Author: alexander-akait

src/utils.js

@@ -34,7 +34,7 @@ const MODULE_REQUEST_REGEX = /^[^?]*~/;
 function createWebpackLessPlugin(loaderContext, implementation) {
   const resolve = loaderContext.getResolve({
     dependencyType: "less",
-    conditionNames: ["less", "style"],
+    conditionNames: ["less", "style", "..."],
     mainFields: ["less", "style", "main", "..."],
     mainFiles: ["index", "..."],
     extensions: [".less", ".css"],

test/__snapshots__/loader.test.js.snap

@@ -583,6 +583,28 @@ exports[`loader should work third-party plugins as fileLoader: errors 1`] = `[]`
 
 exports[`loader should work third-party plugins as fileLoader: warnings 1`] = `[]`;
 
+exports[`loader should work with a package with "sass" and "exports" fields and a custom condition (theme1): css 1`] = `
+".load-me {
+  color: red;
+}
+"
+`;
+
+exports[`loader should work with a package with "sass" and "exports" fields and a custom condition (theme1): errors 1`] = `[]`;
+
+exports[`loader should work with a package with "sass" and "exports" fields and a custom condition (theme1): warnings 1`] = `[]`;
+
+exports[`loader should work with a package with "sass" and "exports" fields and a custom condition (theme2): css 1`] = `
+".load-me {
+  color: blue;
+}
+"
+`;
+
+exports[`loader should work with a package with "sass" and "exports" fields and a custom condition (theme2): errors 1`] = `[]`;
+
+exports[`loader should work with a package with "sass" and "exports" fields and a custom condition (theme2): warnings 1`] = `[]`;
+
 exports[`loader should work: css 1`] = `
 ".box {
   color: #fe33ac;

test/fixtures/import-package-with-exports-and-custom-condition.less

@@ -0,0 +1 @@
+@import 'package-with-exports-and-custom-condition';

test/fixtures/node_modules/package-with-exports-and-custom-condition/index.cjs

@@ -150,8 +150,27 @@ class CustomImportPlugin {
   }
 }
 
-async function getCodeFromLess(testId, options = {}) {
-  const pathToFile = path.resolve(__dirname, "..", "fixtures", testId);
+async function getCodeFromLess(testId, options = {}, context = {}) {
+  let pathToFile;
+
+  if (context.packageExportsCustomConditionTestVariant === 1) {
+    pathToFile = path.resolve(
+      __dirname,
+      "..",
+      "fixtures",
+      "node_modules/package-with-exports-and-custom-condition/style-1.less"
+    );
+  } else if (context.packageExportsCustomConditionTestVariant === 2) {
+    pathToFile = path.resolve(
+      __dirname,
+      "..",
+      "fixtures",
+      "node_modules/package-with-exports-and-custom-condition/style-2.less"
+    );
+  } else {
+    pathToFile = path.resolve(__dirname, "..", "fixtures", testId);
+  }
+
   const defaultOptions = {
     plugins: [],
     relativeUrls: true,