From 3cbeaad7b943c153937ce34365cec2c406f2b98b Mon Sep 17 00:00:00 2001
From: Milos Djermanovic <milos.djermanovic@gmail.com>
Date: Tue, 7 Nov 2023 17:22:19 +0100
Subject: [PATCH] fix: Use `cwd` constructor option as config `basePath` in
 Linter (#17705)

---
 lib/linter/linter.js       |   4 +-
 tests/lib/linter/linter.js | 115 ++++++++++++++++++++++++++++++++++++-
 2 files changed, 115 insertions(+), 4 deletions(-)

diff --git a/lib/linter/linter.js b/lib/linter/linter.js
index e195812e513..9f29933cee4 100644
--- a/lib/linter/linter.js
+++ b/lib/linter/linter.js
@@ -1422,7 +1422,7 @@ class Linter {
     verify(textOrSourceCode, config, filenameOrOptions) {
         debug("Verify");
 
-        const { configType } = internalSlotsMap.get(this);
+        const { configType, cwd } = internalSlotsMap.get(this);
 
         const options = typeof filenameOrOptions === "string"
             ? { filename: filenameOrOptions }
@@ -1441,7 +1441,7 @@ class Linter {
                 let configArray = config;
 
                 if (!Array.isArray(config) || typeof config.getConfig !== "function") {
-                    configArray = new FlatConfigArray(config);
+                    configArray = new FlatConfigArray(config, { basePath: cwd });
                     configArray.normalizeSync();
                 }
 
diff --git a/tests/lib/linter/linter.js b/tests/lib/linter/linter.js
index b89b073ecaf..842d345f294 100644
--- a/tests/lib/linter/linter.js
+++ b/tests/lib/linter/linter.js
@@ -9831,6 +9831,117 @@ describe("Linter with FlatConfigArray", () => {
             });
         });
 
+        // https://github.com/eslint/eslint/issues/17669
+        it("should use `cwd` constructor option as config `basePath` when config is not an instance of FlatConfigArray", () => {
+            const rule = {
+                create(context) {
+                    return {
+                        Program(node) {
+                            context.report({ node, message: "Bad program." });
+                        }
+                    };
+                }
+            };
+
+            const code = "foo";
+            const config = [
+                {
+                    plugins: {
+                        test: {
+                            rules: {
+                                "test-rule-1": rule,
+                                "test-rule-2": rule,
+                                "test-rule-3": rule
+                            }
+                        }
+                    }
+                },
+                {
+                    rules: {
+                        "test/test-rule-1": 2
+                    }
+                },
+                {
+                    files: ["**/*.ts"],
+                    rules: {
+                        "test/test-rule-2": 2
+                    }
+                },
+                {
+                    files: ["bar/file.ts"],
+                    rules: {
+                        "test/test-rule-3": 2
+                    }
+                }
+            ];
+
+            const linterWithOptions = new Linter({
+                configType: "flat",
+                cwd: "/foo"
+            });
+
+            let messages;
+
+            messages = linterWithOptions.verify(code, config, "/file.js");
+            assert.strictEqual(messages.length, 1);
+            assert.deepStrictEqual(messages[0], {
+                ruleId: null,
+                severity: 1,
+                message: "No matching configuration found for /file.js.",
+                line: 0,
+                column: 0,
+                nodeType: null
+            });
+
+            messages = linterWithOptions.verify(code, config, "/file.ts");
+            assert.strictEqual(messages.length, 1);
+            assert.deepStrictEqual(messages[0], {
+                ruleId: null,
+                severity: 1,
+                message: "No matching configuration found for /file.ts.",
+                line: 0,
+                column: 0,
+                nodeType: null
+            });
+
+            messages = linterWithOptions.verify(code, config, "/bar/foo/file.js");
+            assert.strictEqual(messages.length, 1);
+            assert.deepStrictEqual(messages[0], {
+                ruleId: null,
+                severity: 1,
+                message: "No matching configuration found for /bar/foo/file.js.",
+                line: 0,
+                column: 0,
+                nodeType: null
+            });
+
+            messages = linterWithOptions.verify(code, config, "/bar/foo/file.ts");
+            assert.strictEqual(messages.length, 1);
+            assert.deepStrictEqual(messages[0], {
+                ruleId: null,
+                severity: 1,
+                message: "No matching configuration found for /bar/foo/file.ts.",
+                line: 0,
+                column: 0,
+                nodeType: null
+            });
+
+            messages = linterWithOptions.verify(code, config, "/foo/file.js");
+            assert.strictEqual(messages.length, 1);
+            assert.strictEqual(messages[0].ruleId, "test/test-rule-1");
+
+            messages = linterWithOptions.verify(code, config, "/foo/file.ts");
+            assert.strictEqual(messages.length, 2);
+            assert.strictEqual(messages[0].ruleId, "test/test-rule-1");
+            assert.strictEqual(messages[1].ruleId, "test/test-rule-2");
+
+            messages = linterWithOptions.verify(code, config, "/foo/bar/file.ts");
+            assert.strictEqual(messages.length, 3);
+            assert.strictEqual(messages[0].ruleId, "test/test-rule-1");
+            assert.strictEqual(messages[1].ruleId, "test/test-rule-2");
+            assert.strictEqual(messages[2].ruleId, "test/test-rule-3");
+        });
+
         describe("Plugins", () => {
 
             it("should not load rule definition when rule isn't used", () => {
@@ -11976,7 +12087,7 @@ describe("Linter with FlatConfigArray", () => {
                         ...baseConfig
                     };
 
-                    linterWithOption.verify(code, config);
+                    linterWithOption.verify(code, config, `${cwd}/file.js`);
                     assert(spy && spy.calledOnce);
                 });
 
@@ -12059,7 +12170,7 @@ describe("Linter with FlatConfigArray", () => {
                         ...baseConfig
                     };
 
-                    linterWithOption.verify(code, config);
+                    linterWithOption.verify(code, config, `${cwd}/file.js`);
                     assert(spy && spy.calledOnce);
                 });