From 4a5c0c0a788594a53094e5089d3a1a44f29bf589 Mon Sep 17 00:00:00 2001
From: Feng Yu <F3n67u@outlook.com>
Date: Wed, 30 Mar 2022 10:21:56 +0800
Subject: [PATCH] Update src/tsconfig-loader.ts
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Co-authored-by: Michaël De Boey <info@michaeldeboey.be>
---
 src/__tests__/tsconfig-loader.test.ts | 63 +++++++++++++++++----------
 src/tsconfig-loader.ts                | 22 ++++------
 2 files changed, 50 insertions(+), 35 deletions(-)

diff --git a/src/__tests__/tsconfig-loader.test.ts b/src/__tests__/tsconfig-loader.test.ts
index b69a07d..4836898 100644
--- a/src/__tests__/tsconfig-loader.test.ts
+++ b/src/__tests__/tsconfig-loader.test.ts
@@ -107,47 +107,66 @@ describe("tsconfig-loader", () => {
 describe("walkForTsConfig", () => {
   it("should find tsconfig in starting directory", () => {
     const pathToTsconfig = join("/root", "dir1", "tsconfig.json");
-    const res = walkForTsConfig(
-      join("/root", "dir1"),
-      (path) => path === pathToTsconfig
-    );
-    // assert.equal(res, pathToTsconfig);
+    const res = walkForTsConfig(join("/root", "dir1"), (path) => {
+      if (path === "/root/dir1") {
+        return ["tsconfig.json"];
+      } else {
+        return [];
+      }
+    });
     expect(res).toBe(pathToTsconfig);
   });
 
   it("should find jsconfig in starting directory", () => {
     const pathToJsconfig = join("/root", "dir1", "jsconfig.json");
-    const res = walkForTsConfig(
-      join("/root", "dir1"),
-      (path) => path === pathToJsconfig
-    );
-    // assert.equal(res, pathToTsconfig);
+    const res = walkForTsConfig(join("/root", "dir1"), (path) => {
+      if (path === "/root/dir1") {
+        return ["jsconfig.json"];
+      } else {
+        return [];
+      }
+    });
     expect(res).toBe(pathToJsconfig);
   });
 
+  it("tsconfig.json take precedence over jsconfig.json when both exist", () => {
+    const pathToTsconfig = join("/root/dir1", "tsconfig.json");
+    const res = walkForTsConfig(join("/root", "dir1"), (path) => {
+      if (path === "/root/dir1") {
+        return ["jsconfig.json", "tsconfig.json"];
+      } else {
+        return [];
+      }
+    });
+    expect(res).toBe(pathToTsconfig);
+  });
+
   it("should find tsconfig in parent directory", () => {
     const pathToTsconfig = join("/root", "tsconfig.json");
-    const res = walkForTsConfig(
-      join("/root", "dir1"),
-      (path) => path === pathToTsconfig
-    );
-    // assert.equal(res, pathToTsconfig);
+    const res = walkForTsConfig(join("/root", "dir1"), (path) => {
+      if (path === "/root") {
+        return ["tsconfig.json"];
+      } else {
+        return [];
+      }
+    });
     expect(res).toBe(pathToTsconfig);
   });
 
   it("should find jsconfig in parent directory", () => {
     const pathToTsconfig = join("/root", "jsconfig.json");
-    const res = walkForTsConfig(
-      join("/root", "dir1"),
-      (path) => path === pathToTsconfig
-    );
-    // assert.equal(res, pathToTsconfig);
+    const res = walkForTsConfig(join("/root", "dir1"), (path) => {
+      if (path === "/root") {
+        return ["jsconfig.json"];
+      } else {
+        return [];
+      }
+    });
     expect(res).toBe(pathToTsconfig);
   });
 
   it("should return undefined when reaching the top", () => {
-    const res = walkForTsConfig(join("/root", "dir1", "kalle"), () => false);
-    // assert.equal(res, undefined);
+    const res = walkForTsConfig(join("/root", "dir1", "kalle"), () => []);
     expect(res).toBeUndefined();
   });
 });
diff --git a/src/tsconfig-loader.ts b/src/tsconfig-loader.ts
index 9854f34..93b6326 100644
--- a/src/tsconfig-loader.ts
+++ b/src/tsconfig-loader.ts
@@ -90,30 +90,26 @@ function resolveConfigPath(cwd: string, filename?: string): string | undefined {
   const configAbsolutePath = walkForTsConfig(cwd);
   return configAbsolutePath ? path.resolve(configAbsolutePath) : undefined;
 }
-
 export function walkForTsConfig(
   directory: string,
-  // eslint-disable-next-line no-shadow
-  existsSync: (path: string) => boolean = fs.existsSync
+  readdirSync: (path: string) => string[] = fs.readdirSync
 ): string | undefined {
-  let configPath = path.join(directory, "./tsconfig.json");
-  if (existsSync(configPath)) {
-    return configPath;
-  }
-
-  configPath = path.join(directory, "./jsconfig.json");
-  if (existsSync(configPath)) {
-    return configPath;
+  const files = readdirSync(directory);
+  const filesToCheck = ["tsconfig.json", "jsconfig.json"];
+  for (const fileToCheck of filesToCheck) {
+    if (files.indexOf(fileToCheck) !== -1) {
+      return path.join(directory, fileToCheck);
+    }
   }
 
-  const parentDirectory = path.join(directory, "../");
+  const parentDirectory = path.dirname(directory);
 
   // If we reached the top
   if (directory === parentDirectory) {
     return undefined;
   }
 
-  return walkForTsConfig(parentDirectory, existsSync);
+  return walkForTsConfig(parentDirectory, readdirSync);
 }
 
 export function loadTsconfig(