Throw an original error if err.code is unexpected

Author: hmsk

index.js

@@ -70,11 +70,15 @@ module.exports = function (source) {
       vueCompiler = require('vue-template-compiler')
       compileVueTemplate = require('@vue/component-compiler-utils').compileTemplate
     } catch (err) {
-      throw new Error(
-        "Failed to import vue-template-compiler or/and @vue/component-compiler-utils: \n" +
-        "If you intend to use 'vue-component', `vue-render-functions` mode, install both to your project: \n" +
-        "https://hmsk.github.io/frontmatter-markdown-loader/vue.html"
-      );
+      if (err.code === "MODULE_NOT_FOUND") {
+        throw new Error(
+          "Failed to import vue-template-compiler or/and @vue/component-compiler-utils: \n" +
+            "If you intend to use 'vue-component', `vue-render-functions` mode, install both to your project: \n" +
+            "https://hmsk.github.io/frontmatter-markdown-loader/vue.html"
+        );
+      } else {
+        throw err;
+      }
     }
 
     const vueRootClass = options.vue && options.vue.root ? options.vue.root : 'frontmatter-markdown';

test/frontmatter-markdown-loader.test.js

@@ -168,20 +168,33 @@ describe("frontmatter-markdown-loader", () => {
 
         it("throw if vue-template|compiler is not installed in the project", () => {
           jest.mock('vue-template-compiler', () => {
-            throw new Error();
+            const error = new Error()
+            error.code = 'MODULE_NOT_FOUND'
+            throw error
           });
           expect(() => {
             load(markdownWithFrontmatter, contextEnablingVueRenderFunctions());
-          }).toThrow();
+          }).toThrow(/Failed to import/);
         });
 
         it("throw if @vue/component-compiler-utils is not installed in the project", () => {
           jest.mock("@vue/component-compiler-utils", () => {
-            throw new Error();
+            const error = new Error()
+            error.code = 'MODULE_NOT_FOUND'
+            throw error
           });
           expect(() => {
             load(markdownWithFrontmatter, contextEnablingVueRenderFunctions());
-          }).toThrow();
+          }).toThrow(/Failed to import/);
+        });
+
+        it("throw if unintentional exception by importing @vue/component-compiler-utils", () => {
+          jest.mock("@vue/component-compiler-utils", () => {
+            throw new Error('unintentional problem')
+          });
+          expect(() => {
+            load(markdownWithFrontmatter, contextEnablingVueRenderFunctions());
+          }).toThrow('unintentional problem');
         });
       });
 
@@ -243,20 +256,33 @@ describe("frontmatter-markdown-loader", () => {
 
         it("throw if vue-template|compiler is not installed in the project", () => {
           jest.mock('vue-template-compiler', () => {
-            throw new Error();
+            const error = new Error()
+            error.code = 'MODULE_NOT_FOUND'
+            throw error
           });
           expect(() => {
             load(markdownWithFrontmatterIncludingChildComponent, contextEnablingVueComponent());
-          }).toThrow();
+          }).toThrow(/Failed to import/);
         });
 
         it("throw if @vue/component-compiler-utils is not installed in the project", () => {
           jest.mock("@vue/component-compiler-utils", () => {
-            throw new Error();
+            const error = new Error()
+            error.code = 'MODULE_NOT_FOUND'
+            throw error
+          });
+          expect(() => {
+            load(markdownWithFrontmatterIncludingChildComponent, contextEnablingVueComponent());
+          }).toThrow(/Failed to import/);
+        });
+
+        it("throw if unintentional exception by importing @vue/component-compiler-utils", () => {
+          jest.mock("@vue/component-compiler-utils", () => {
+            throw new Error('unintentional problem')
           });
           expect(() => {
             load(markdownWithFrontmatterIncludingChildComponent, contextEnablingVueComponent());
-          }).toThrow();
+          }).toThrow('unintentional problem');
         });
       });