diff --git a/package.json b/package.json
index 1b8cf61b2..7403fd1cc 100644
--- a/package.json
+++ b/package.json
@@ -54,7 +54,6 @@
     "diff": "5.1.0",
     "eastasianwidth": "0.2.0",
     "editorconfig": "0.15.3",
-    "editorconfig-to-prettier": "1.0.0",
     "emoji-regex": "10.2.1",
     "escape-string-regexp": "5.0.0",
     "espree": "9.6.1",
diff --git a/src/config/editorconfig-to-prettier.js b/src/config/editorconfig-to-prettier.js
new file mode 100644
index 000000000..f07e957f0
--- /dev/null
+++ b/src/config/editorconfig-to-prettier.js
@@ -0,0 +1,75 @@
+function removeUnset(editorConfig) {
+  const result = {};
+  const keys = Object.keys(editorConfig);
+  for (let i = 0; i < keys.length; i++) {
+    const key = keys[i];
+    if (editorConfig[key] === "unset") {
+      continue;
+    }
+    result[key] = editorConfig[key];
+  }
+  return result;
+}
+
+function editorConfigToPrettier(editorConfig) {
+  if (!editorConfig) {
+    return null;
+  }
+
+  editorConfig = removeUnset(editorConfig);
+
+  if (Object.keys(editorConfig).length === 0) {
+    return null;
+  }
+
+  const result = {};
+
+  if (editorConfig.indent_style) {
+    result.useTabs = editorConfig.indent_style === "tab";
+  }
+
+  if (editorConfig.indent_size === "tab") {
+    result.useTabs = true;
+  }
+
+  if (result.useTabs && editorConfig.tab_width) {
+    result.tabWidth = editorConfig.tab_width;
+  } else if (
+    editorConfig.indent_style === "space" &&
+    editorConfig.indent_size &&
+    editorConfig.indent_size !== "tab"
+  ) {
+    result.tabWidth = editorConfig.indent_size;
+  } else if (editorConfig.tab_width !== undefined) {
+    result.tabWidth = editorConfig.tab_width;
+  }
+
+  if (editorConfig.max_line_length) {
+    if (editorConfig.max_line_length === "off") {
+      result.printWidth = Number.POSITIVE_INFINITY;
+    } else {
+      result.printWidth = editorConfig.max_line_length;
+    }
+  }
+
+  if (editorConfig.quote_type === "single") {
+    result.singleQuote = true;
+  } else if (editorConfig.quote_type === "double") {
+    result.singleQuote = false;
+  }
+
+  if (["cr", "crlf", "lf"].includes(editorConfig.end_of_line)) {
+    result.endOfLine = editorConfig.end_of_line;
+  }
+
+  if (
+    editorConfig.insert_final_newline === false ||
+    editorConfig.insert_final_newline === true
+  ) {
+    result.insertFinalNewline = editorConfig.insert_final_newline;
+  }
+
+  return result;
+}
+
+export default editorConfigToPrettier;
diff --git a/src/config/resolve-editorconfig.js b/src/config/resolve-editorconfig.js
index 90e16067c..5877c94f1 100644
--- a/src/config/resolve-editorconfig.js
+++ b/src/config/resolve-editorconfig.js
@@ -1,6 +1,6 @@
 import path from "node:path";
 import editorconfig from "editorconfig";
-import editorConfigToPrettier from "editorconfig-to-prettier";
+import editorConfigToPrettier from "./editorconfig-to-prettier.js";
 import findProjectRoot from "./find-project-root.js";
 
 async function loadEditorConfig(filePath) {
diff --git a/tests/unit/editorconfig-to-prettier.js b/tests/unit/editorconfig-to-prettier.js
new file mode 100644
index 000000000..b911382fe
--- /dev/null
+++ b/tests/unit/editorconfig-to-prettier.js
@@ -0,0 +1,149 @@
+import editorconfigToPrettier from "../../src/config/editorconfig-to-prettier.js";
+
+test("editorconfigToPrettier", () => {
+  expect(
+    editorconfigToPrettier({
+      indent_style: "tab",
+      tab_width: 8,
+      indent_size: 2,
+      max_line_length: 100,
+    }),
+  ).toStrictEqual({
+    useTabs: true,
+    tabWidth: 8,
+    printWidth: 100,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      indent_style: "space",
+      tab_width: 8,
+      indent_size: 2,
+      max_line_length: 100,
+    }),
+  ).toStrictEqual({
+    useTabs: false,
+    tabWidth: 2,
+    printWidth: 100,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      indent_style: "space",
+      tab_width: 8,
+      indent_size: 8,
+      max_line_length: 100,
+    }),
+  ).toStrictEqual({
+    useTabs: false,
+    tabWidth: 8,
+    printWidth: 100,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      tab_width: 4,
+      indent_size: "tab",
+    }),
+  ).toStrictEqual({
+    tabWidth: 4,
+    useTabs: true,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      indent_size: "tab",
+    }),
+  ).toStrictEqual({
+    useTabs: true,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      tab_width: 0,
+      indent_size: 0,
+    }),
+  ).toStrictEqual({
+    tabWidth: 0,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      quote_type: "single",
+    }),
+  ).toStrictEqual({
+    singleQuote: true,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      quote_type: "double",
+    }),
+  ).toStrictEqual({
+    singleQuote: false,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      quote_type: "double",
+      max_line_length: "off",
+    }),
+  ).toStrictEqual({
+    printWidth: Number.POSITIVE_INFINITY,
+    singleQuote: false,
+  });
+
+  expect(
+    editorconfigToPrettier({
+      end_of_line: "cr",
+    }),
+  ).toStrictEqual({
+    endOfLine: "cr",
+  });
+
+  expect(
+    editorconfigToPrettier({
+      end_of_line: "crlf",
+    }),
+  ).toStrictEqual({
+    endOfLine: "crlf",
+  });
+
+  expect(
+    editorconfigToPrettier({
+      end_of_line: "lf",
+    }),
+  ).toStrictEqual({
+    endOfLine: "lf",
+  });
+
+  expect(
+    editorconfigToPrettier({
+      endOfLine: 123,
+    }),
+  ).toStrictEqual({});
+
+  expect(
+    editorconfigToPrettier({
+      indent_style: "space",
+      indent_size: 2,
+      max_line_length: "unset",
+    }),
+  ).toStrictEqual({
+    useTabs: false,
+    tabWidth: 2,
+  });
+
+  expect(editorconfigToPrettier({ insert_final_newline: false })).toStrictEqual(
+    {
+      insertFinalNewline: false,
+    },
+  );
+
+  expect(editorconfigToPrettier({ insert_final_newline: true })).toStrictEqual({
+    insertFinalNewline: true,
+  });
+
+  expect(editorconfigToPrettier({})).toBeNull();
+  expect(editorconfigToPrettier(null)).toBeNull();
+});
diff --git a/yarn.lock b/yarn.lock
index abeb58bc3..53ea7f32d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3244,13 +3244,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"editorconfig-to-prettier@npm:1.0.0":
-  version: 1.0.0
-  resolution: "editorconfig-to-prettier@npm:1.0.0"
-  checksum: 8054f8593c2f93abca9f3c6db91030fbd80a15fd36b076a5f3fbeb246267173e290817adfb3389d9066026bcc85822e72b7635596e9dda6e74927ae110cbc474
-  languageName: node
-  linkType: hard
-
 "editorconfig@npm:0.15.3":
   version: 0.15.3
   resolution: "editorconfig@npm:0.15.3"
@@ -7176,7 +7169,6 @@ __metadata:
     diff: 5.1.0
     eastasianwidth: 0.2.0
     editorconfig: 0.15.3
-    editorconfig-to-prettier: 1.0.0
     emoji-regex: 10.2.1
     enquirer: 2.4.1
     esbuild: 0.19.2