test(oxfmt): Add tests for .editorconfig support

apps/oxfmt/test/__snapshots__/editorconfig.test.ts.snap

@@ -0,0 +1,83 @@
+// Vitest Snapshot v1, https://vitest.dev/guide/snapshot.html
+
+exports[`editorconfig > .oxfmtrc overrides .editorconfig 1`] = `
+"--- FILE -----------
+test.js
+--- BEFORE ---------
+if (true) { console.log("hello"); }
+
+--- AFTER ----------
+if (true) {
+  console.log("hello");
+}
+
+--------------------"
+`;
+
+exports[`editorconfig > basic settings from .editorconfig 1`] = `
+"--- FILE -----------
+test.js
+--- BEFORE ---------
+if (condition) { console.log("hello world"); }
+
+--- AFTER ----------
+if (condition) {
+	console.log("hello world");
+}
+
+--------------------"
+`;
+
+exports[`editorconfig > empty .editorconfig 1`] = `
+"--- FILE -----------
+test.js
+--- BEFORE ---------
+if (true) { console.log("hello"); }
+
+--- AFTER ----------
+if (true) {
+  console.log("hello");
+}
+
+--------------------"
+`;
+
+exports[`editorconfig > no root [*] section 1`] = `
+"--- FILE -----------
+test.js
+--- BEFORE ---------
+if (true) { console.log("js"); }
+
+--- AFTER ----------
+if (true) {
+	console.log("js");
+}
+
+--------------------
+
+--- FILE -----------
+test.ts
+--- BEFORE ---------
+if (true) { console.log("ts"); }
+
+--- AFTER ----------
+if (true) {
+  console.log("ts");
+}
+
+--------------------"
+`;
+
+exports[`editorconfig > partial override - settings from both files merged 1`] = `
+"--- FILE -----------
+test.js
+--- BEFORE ---------
+if (true) { console.log("hello"); }
+
+--- AFTER ----------
+if (true) {
+	console.log("hello");
+}
+
+--------------------"
+`;

apps/oxfmt/test/editorconfig.test.ts

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+import { describe, expect, it } from "vitest";
+import { join } from "node:path";
+import { runWriteModeAndSnapshot } from "./utils";
+
+const fixturesDir = join(__dirname, "fixtures", "editorconfig");
+
+describe("editorconfig", () => {
+  // .editorconfig:
+  //   [*] indent_style=tab, indent_size=4, max_line_length=40
+  //
+  // Expected: useTabs=true, tabWidth=4, printWidth=40
+  // - Code should be broken into multiple lines (printWidth=40)
+  // - Indentation should use tabs (not spaces)
+  it("basic settings from .editorconfig", async () => {
+    const cwd = join(fixturesDir, "basic");
+    const snapshot = await runWriteModeAndSnapshot(cwd, ["test.js"]);
+    expect(snapshot).toMatchSnapshot();
+  });
+
+  // .editorconfig:
+  //   [*] indent_style=tab, indent_size=8
+  // .oxfmtrc.json:
+  //   useTabs=false, tabWidth=2
+  //
+  // Expected: useTabs=false, tabWidth=2 (oxfmtrc wins)
+  // - Indentation should use 2 spaces, NOT tabs
+  it(".oxfmtrc overrides .editorconfig", async () => {
+    const cwd = join(fixturesDir, "with_oxfmtrc");
+    const snapshot = await runWriteModeAndSnapshot(cwd, ["test.js"]);
+    expect(snapshot).toMatchSnapshot();
+  });
+
+  // .editorconfig:
+  //   [*] indent_style=space, indent_size=2
+  //   [*.ts] indent_size=4
+  //   [nested/**/*.js] indent_size=8
+  //   [nested/**/*.json] indent_size=8, max_line_length=40
+  //
+  // Expected:
+  // - test.js: tabWidth=2 (from [*], not matched by [nested/**/*.js])
+  // - test.ts: tabWidth=4 (from [*.ts])
+  // - nested/deep/test.js: tabWidth=8 (from [nested/**/*.js], deep path glob)
+  // - nested/deep/test.json: tabWidth=8, printWidth=40 (from [nested/**/*.json], deep path glob for external formatter)
+  // TODO: Should fix `editor_config_parser` to accept `cwd` for `resolve()`
+  // oxlint-disable-next-line vitest/no-disabled-tests
+  it.skip("per-file overrides", async () => {
+    const cwd = join(fixturesDir, "per_file_override");
+    const snapshot = await runWriteModeAndSnapshot(cwd, [
+      "test.js",
+      "test.ts",
+      "nested/deep/test.js",
+      "nested/deep/test.json",
+    ]);
+    expect(snapshot).toMatchSnapshot();
+  });
+
+  // .editorconfig:
+  //   [*.js] indent_style=tab, indent_size=4
+  //   (no [*] section)
+  //
+  // Expected:
+  // - test.js: useTabs=true, tabWidth=4 (from [*.js])
+  // - test.ts: default settings (no matching section)
+  it("no root [*] section", async () => {
+    const cwd = join(fixturesDir, "no_root_section");
+    const snapshot = await runWriteModeAndSnapshot(cwd, ["test.js", "test.ts"]);
+    expect(snapshot).toMatchSnapshot();
+  });
+
+  // .editorconfig:
+  //   [*] indent_style=tab
+  // .oxfmtrc.json:
+  //   tabWidth=8
+  //
+  // Expected: useTabs=true (from editorconfig), tabWidth=8 (from oxfmtrc)
+  // - Both settings should be merged, not one overwriting the other entirely
+  it("partial override - settings from both files merged", async () => {
+    const cwd = join(fixturesDir, "partial_override");
+    const snapshot = await runWriteModeAndSnapshot(cwd, ["test.js"]);
+    expect(snapshot).toMatchSnapshot();
+  });
+
+  // .editorconfig: (empty file)
+  //
+  // Expected: default settings (useTabs=false, tabWidth=2)
+  // - Empty editorconfig should not cause errors
+  it("empty .editorconfig", async () => {
+    const cwd = join(fixturesDir, "empty");
+    const snapshot = await runWriteModeAndSnapshot(cwd, ["test.js"]);
+    expect(snapshot).toMatchSnapshot();
+  });
+});

apps/oxfmt/test/fixtures/editorconfig/basic/.editorconfig

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+[*]
+indent_style = tab
+indent_size = 4
+max_line_length = 40

apps/oxfmt/test/fixtures/editorconfig/basic/test.js

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+if (condition) { console.log("hello world"); }

apps/oxfmt/test/fixtures/editorconfig/empty/test.js

@@ -0,0 +1 @@
+if (true) { console.log("hello"); }

apps/oxfmt/test/fixtures/editorconfig/no_root_section/.editorconfig

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+[*.js]
+indent_style = tab
+indent_size = 4

apps/oxfmt/test/fixtures/editorconfig/no_root_section/test.js

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+if (true) { console.log("js"); }

apps/oxfmt/test/fixtures/editorconfig/no_root_section/test.ts

@@ -0,0 +1 @@
+if (true) { console.log("ts"); }

apps/oxfmt/test/fixtures/editorconfig/partial_override/.editorconfig

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+[*]
+indent_style = tab

apps/oxfmt/test/fixtures/editorconfig/partial_override/.oxfmtrc.json

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+{
+  "tabWidth": 8
+}

apps/oxfmt/test/fixtures/editorconfig/partial_override/test.js

@@ -0,0 +1 @@
+if (true) { console.log("hello"); }

apps/oxfmt/test/fixtures/editorconfig/per_file_override/.editorconfig

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+[*]
+indent_style = space
+indent_size = 2
+
+[*.ts]
+indent_size = 4
+
+[nested/**/*.js]
+indent_size = 8
+
+[nested/deep/*.json]
+indent_size = 8
+max_line_length = 40

apps/oxfmt/test/fixtures/editorconfig/per_file_override/nested/deep/test.js

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+if (true) { console.log("nested js"); }

apps/oxfmt/test/fixtures/editorconfig/per_file_override/nested/deep/test.json

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+{"a":1,"b":2,"c":3,"d":4,"e":5,"f":6,"g":7,"h":8}

apps/oxfmt/test/fixtures/editorconfig/per_file_override/test.js

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+if (true) { console.log("js"); }

apps/oxfmt/test/fixtures/editorconfig/per_file_override/test.ts

@@ -0,0 +1 @@
+if (true) { console.log("ts"); }

apps/oxfmt/test/fixtures/editorconfig/with_oxfmtrc/.editorconfig

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+[*]
+indent_style = tab
+indent_size = 8

apps/oxfmt/test/fixtures/editorconfig/with_oxfmtrc/.oxfmtrc.json

@@ -0,0 +1,4 @@
+{
+  "useTabs": false,
+  "tabWidth": 2
+}

apps/oxfmt/test/fixtures/editorconfig/with_oxfmtrc/test.js

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+if (true) { console.log("hello"); }