feat: treats folder and link not found exceptions

src/core/commands/mklink.ts

@@ -1,8 +1,8 @@
+import * as fs from "fs";
 import { glob } from "glob";
 import * as path from "path";
-import * as fs from "fs";
-import { logger } from "../Logger";
 import { Yarn } from "../../helpers/Yarn";
+import { logger } from "../Logger";
 
 /**
  * Creates multiple links for a given pattern.
@@ -30,6 +30,12 @@ export const mklink = async(link: {
         ignore: "node_modules/**"
     });
 
+    // If there's no possible project paths
+    if (!possibleProjectPaths.length) {
+        logger.error("found no folders matching the pattern \"%s\"", link.pattern);
+        return;
+    }
+
     for (const projectPath of possibleProjectPaths) {
         const packageJsonPath = path.resolve(projectPath, "package.json");
 

src/core/commands/resetGlobalLinks.ts

@@ -3,9 +3,10 @@ import { Yarn } from "../../helpers/Yarn";
 import { logger } from "../Logger";
 
 /**
-     * Resets global links.
-     * @param opts Any options to be passed to the resetter.
-     */
+ * Resets global links.
+ * This operation will unlink all globally linked packages.
+ * @param opts Any options to be passed to the resetter.
+ */
 export const resetGlobalLinks = async (opts?: {
     /**
      * Will only delete broken symlinks.

src/helpers/Yarn.ts

@@ -4,8 +4,8 @@ import { execSync } from "child_process";
 import * as fs from "fs";
 import * as path from "path";
 
-import { ExternalYarn, execYarn as invokeYarn } from "./ExternalYarn";
 import { logger } from "../core/Logger";
+import { ExternalYarn, execYarn as invokeYarn } from "./ExternalYarn";
 
 export interface IYarnExecOptions {
     cmd: string;
@@ -275,6 +275,19 @@ export class Yarn {
     }) {
         const linksPath = await this.getGlobalLinksPath();
 
+        // Throw if the path doesn't exist
+        if (!fs.existsSync(linksPath)) {
+            const err = new Error("The global links path wasn't found.\nThis could mean that no links were created yet.\nYou can create a link by running `nayr link` in the package folder.") as  Error & {
+                code: string;
+                path: string;
+            };
+
+            err.code = "ENOENT";
+            err.path = linksPath;
+
+            throw err;
+        }
+
         const rootItems = await fs.promises.readdir(linksPath, {
             recursive: false
         });