diff --git a/changelog_unreleased/api/pr-8551.md b/changelog_unreleased/api/pr-8551.md
new file mode 100644
index 000000000..bf60b5a1a
--- /dev/null
+++ b/changelog_unreleased/api/pr-8551.md
@@ -0,0 +1,29 @@
+#### Fix `prettier.getFileInfo()` ([#8548](https://github.com/prettier/prettier/pull/8548), [#8551](https://github.com/prettier/prettier/pull/8551) by [@fisker](https://github.com/fisker))
+
+When passing `{resolveConfig: true}`, the parsers in config file is preferred.
+
+<!-- prettier-ignore -->
+```console
+$ echo {"parser":"flow"}>.prettierrc
+$ node -p "require('prettier').getFileInfo.sync('./foo.js', {resolveConfig: true})"
+
+# Prettier stable
+# { ignored: false, inferredParser: 'babel' }
+
+# Prettier master
+# { ignored: false, inferredParser: 'flow' }
+```
+
+If given `filePath` is ignored, the `inferredParser` is always `null`.
+
+<!-- prettier-ignore -->
+```console
+$ echo ignored.js>>.prettierignore
+$ node -p "require('prettier').getFileInfo.sync('./ignored.js')"
+
+# Prettier stable
+# { ignored: true, inferredParser: 'babel' }
+
+# Prettier master
+# { ignored: true, inferredParser: null }
+```
diff --git a/docs/api.md b/docs/api.md
index a0f11070d..7aca4b126 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -98,6 +98,8 @@ The promise will be rejected if the type of `filePath` is not `string`.
 
 Setting `options.ignorePath` (`string`) and `options.withNodeModules` (`boolean`) influence the value of `ignored` (`false` by default).
 
+If the given `filePath` is ignored, the `inferredParser` is always `null`.
+
 Providing [plugin](plugins.md) paths in `options.plugins` (`string[]`) helps extract `inferredParser` for files that are not supported by Prettier core.
 
 When setting `options.resolveConfig` (`boolean`, default `false`), Prettier will resolve the configuration for the given `filePath`. This is useful, for example, when the `inferredParser` might be overridden for a subset of files.
diff --git a/src/common/get-file-info.js b/src/common/get-file-info.js
index 794c85899..e1b99784e 100644
--- a/src/common/get-file-info.js
+++ b/src/common/get-file-info.js
@@ -58,6 +58,20 @@ getFileInfo.sync = function (filePath, opts) {
   });
 };
 
+function getFileParser(resolvedConfig, filePath, plugins) {
+  if (resolvedConfig && resolvedConfig.parser) {
+    return resolvedConfig.parser;
+  }
+
+  const inferredParser = options.inferParser(filePath, plugins);
+
+  if (inferredParser) {
+    return inferredParser;
+  }
+
+  return null;
+}
+
 function _getFileInfo({
   ignorer,
   filePath,
@@ -74,31 +88,25 @@ function _getFileInfo({
     return fileInfo;
   }
 
-  const inferredParser = options.inferParser(filePath, plugins);
+  let resolvedConfig;
 
-  if (inferredParser) {
-    fileInfo.inferredParser = inferredParser;
-    return fileInfo;
-  }
-
-  if (!resolveConfig) {
-    return fileInfo;
-  }
-
-  if (sync) {
-    const resolvedConfig = config.resolveConfig.sync(filePath);
-    if (resolvedConfig && resolvedConfig.parser) {
-      fileInfo.inferredParser = resolvedConfig.parser;
+  if (resolveConfig) {
+    if (sync) {
+      resolvedConfig = config.resolveConfig.sync(filePath);
+    } else {
+      return config.resolveConfig(filePath).then((resolvedConfig) => {
+        fileInfo.inferredParser = getFileParser(
+          resolvedConfig,
+          filePath,
+          plugins
+        );
+        return fileInfo;
+      });
     }
-    return fileInfo;
   }
 
-  return config.resolveConfig(filePath).then((resolvedConfig) => {
-    if (resolvedConfig && resolvedConfig.parser) {
-      fileInfo.inferredParser = resolvedConfig.parser;
-    }
-    return fileInfo;
-  });
+  fileInfo.inferredParser = getFileParser(resolvedConfig, filePath, plugins);
+  return fileInfo;
 }
 
 function normalizeFilePath(filePath, ignorePath) {
diff --git a/tests_integration/__tests__/file-info.js b/tests_integration/__tests__/file-info.js
index 8772e684f..3df43c07b 100644
--- a/tests_integration/__tests__/file-info.js
+++ b/tests_integration/__tests__/file-info.js
@@ -3,6 +3,7 @@
 const path = require("path");
 const tempy = require("tempy");
 const fs = require("fs");
+const fromPairs = require("lodash/fromPairs");
 
 const runPrettier = require("../runPrettier");
 const prettier = require("prettier/local");
@@ -131,155 +132,167 @@ test("API getFileInfo.sync with filepath only", () => {
   });
 });
 
-test("API getFileInfo with resolveConfig", () => {
-  const file1 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config/file.foo")
+describe("API getFileInfo resolveConfig", () => {
+  const files = fromPairs(
+    ["foo", "js", "bar", "css"].map((ext) => [
+      ext,
+      path.resolve(
+        path.join(__dirname, `../cli/with-resolve-config/file.${ext}`)
+      ),
+    ])
   );
-  const file2 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config/file.bar")
-  );
-  const file3 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config/file.js")
-  );
-
-  expect(prettier.getFileInfo(file1)).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: null,
+  test("{resolveConfig: undefined}", () => {
+    expect(prettier.getFileInfo(files.foo)).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(prettier.getFileInfo(files.js)).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: "babel",
+    });
+    expect(prettier.getFileInfo(files.bar)).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(prettier.getFileInfo(files.css)).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: "css",
+    });
   });
-  expect(prettier.getFileInfo(file2)).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: null,
+  test("{resolveConfig: true}", () => {
+    expect(
+      prettier.getFileInfo(files.foo, { resolveConfig: true })
+    ).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: "foo-parser",
+    });
+    expect(
+      prettier.getFileInfo(files.js, { resolveConfig: true })
+    ).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: "override-js-parser",
+    });
+    expect(
+      prettier.getFileInfo(files.bar, { resolveConfig: true })
+    ).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(
+      prettier.getFileInfo(files.css, { resolveConfig: true })
+    ).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: "css",
+    });
   });
-  expect(prettier.getFileInfo(file3)).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: "babel",
+  test("sync {resolveConfig: undefined}", () => {
+    expect(prettier.getFileInfo.sync(files.foo)).toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(prettier.getFileInfo.sync(files.js)).toMatchObject({
+      ignored: false,
+      inferredParser: "babel",
+    });
+    expect(prettier.getFileInfo.sync(files.bar)).toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(prettier.getFileInfo.sync(files.css)).toMatchObject({
+      ignored: false,
+      inferredParser: "css",
+    });
   });
-  expect(
-    prettier.getFileInfo(file1, {
-      resolveConfig: true,
-    })
-  ).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: "json",
-  });
-  expect(
-    prettier.getFileInfo(file2, {
-      resolveConfig: true,
-    })
-  ).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: "babel",
-  });
-  expect(
-    prettier.getFileInfo(file3, {
-      resolveConfig: true,
-    })
-  ).resolves.toMatchObject({
-    ignored: false,
-    // Bug: should be `not-babel`
-    inferredParser: "babel",
+  test("sync {resolveConfig: true}", () => {
+    expect(
+      prettier.getFileInfo.sync(files.foo, {
+        resolveConfig: true,
+      })
+    ).toMatchObject({
+      ignored: false,
+      inferredParser: "foo-parser",
+    });
+    expect(
+      prettier.getFileInfo.sync(files.js, {
+        resolveConfig: true,
+      })
+    ).toMatchObject({
+      ignored: false,
+      inferredParser: "override-js-parser",
+    });
+    expect(
+      prettier.getFileInfo.sync(files.bar, {
+        resolveConfig: true,
+      })
+    ).toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(
+      prettier.getFileInfo.sync(files.css, {
+        resolveConfig: true,
+      })
+    ).toMatchObject({
+      ignored: false,
+      inferredParser: "css",
+    });
   });
 });
 
-test("API getFileInfo with resolveConfig when no config is present", () => {
-  const file1 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config-no-config/file.foo")
+describe("API getFileInfo resolveConfig when no config is present", () => {
+  const files = fromPairs(
+    ["foo", "js"].map((ext) => [
+      ext,
+      path.resolve(path.join(__dirname, `../cli/non-exists-dir/file.${ext}`)),
+    ])
   );
-  const file2 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config-no-config/file.bar")
-  );
-
-  expect(prettier.getFileInfo(file1)).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: null,
+  test("{resolveConfig: undefined}", () => {
+    expect(prettier.getFileInfo(files.foo)).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(prettier.getFileInfo(files.js)).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: "babel",
+    });
   });
-  expect(prettier.getFileInfo(file2)).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: null,
+  test("{resolveConfig: true}", () => {
+    expect(
+      prettier.getFileInfo(files.foo, { resolveConfig: true })
+    ).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(
+      prettier.getFileInfo(files.js, { resolveConfig: true })
+    ).resolves.toMatchObject({
+      ignored: false,
+      inferredParser: "babel",
+    });
   });
-  expect(
-    prettier.getFileInfo(file1, {
-      resolveConfig: true,
-    })
-  ).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: null,
+  test("sync {resolveConfig: undefined}", () => {
+    expect(prettier.getFileInfo.sync(files.foo)).toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(prettier.getFileInfo.sync(files.js)).toMatchObject({
+      ignored: false,
+      inferredParser: "babel",
+    });
   });
-  expect(
-    prettier.getFileInfo(file2, {
-      resolveConfig: true,
-    })
-  ).resolves.toMatchObject({
-    ignored: false,
-    inferredParser: null,
-  });
-});
-
-test("API getFileInfo.sync with resolveConfig", () => {
-  const file1 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config/file.foo")
-  );
-  const file2 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config/file.bar")
-  );
-
-  expect(prettier.getFileInfo.sync(file1)).toMatchObject({
-    ignored: false,
-    inferredParser: null,
-  });
-  expect(prettier.getFileInfo.sync(file2)).toMatchObject({
-    ignored: false,
-    inferredParser: null,
-  });
-  expect(
-    prettier.getFileInfo.sync(file1, {
-      resolveConfig: true,
-    })
-  ).toMatchObject({
-    ignored: false,
-    inferredParser: "json",
-  });
-  expect(
-    prettier.getFileInfo.sync(file2, {
-      resolveConfig: true,
-    })
-  ).toMatchObject({
-    ignored: false,
-    inferredParser: "babel",
-  });
-});
-
-test("API getFileInfo.sync with resolveConfig when no config is present", () => {
-  const file1 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config-no-config/file.foo")
-  );
-  const file2 = path.resolve(
-    path.join(__dirname, "../cli/with-resolve-config-no-config/file.bar")
-  );
-
-  expect(prettier.getFileInfo.sync(file1)).toMatchObject({
-    ignored: false,
-    inferredParser: null,
-  });
-  expect(prettier.getFileInfo.sync(file2)).toMatchObject({
-    ignored: false,
-    inferredParser: null,
-  });
-  expect(
-    prettier.getFileInfo.sync(file1, {
-      resolveConfig: true,
-    })
-  ).toMatchObject({
-    ignored: false,
-    inferredParser: null,
-  });
-  expect(
-    prettier.getFileInfo.sync(file2, {
-      resolveConfig: true,
-    })
-  ).toMatchObject({
-    ignored: false,
-    inferredParser: null,
+  test("sync {resolveConfig: true}", () => {
+    expect(
+      prettier.getFileInfo.sync(files.foo, { resolveConfig: true })
+    ).toMatchObject({
+      ignored: false,
+      inferredParser: null,
+    });
+    expect(
+      prettier.getFileInfo.sync(files.js, { resolveConfig: true })
+    ).toMatchObject({
+      ignored: false,
+      inferredParser: "babel",
+    });
   });
 });
 
diff --git a/tests_integration/cli/with-resolve-config-no-config/file.bar b/tests_integration/cli/with-resolve-config-no-config/file.bar
deleted file mode 100644
index 4f4b4c843..000000000
--- a/tests_integration/cli/with-resolve-config-no-config/file.bar
+++ /dev/null
@@ -1 +0,0 @@
-const foo = "bar";
diff --git a/tests_integration/cli/with-resolve-config-no-config/file.foo b/tests_integration/cli/with-resolve-config-no-config/file.foo
deleted file mode 100644
index 0967ef424..000000000
--- a/tests_integration/cli/with-resolve-config-no-config/file.foo
+++ /dev/null
@@ -1 +0,0 @@
-{}
diff --git a/tests_integration/cli/with-resolve-config/.prettierrc b/tests_integration/cli/with-resolve-config/.prettierrc
index 9c434fb72..b30d8cbb0 100644
--- a/tests_integration/cli/with-resolve-config/.prettierrc
+++ b/tests_integration/cli/with-resolve-config/.prettierrc
@@ -2,15 +2,11 @@
   "overrides": [
     {
       "files": "*.foo",
-      "options": { "parser": "json" }
-    },
-    {
-      "files": "*.bar",
-      "options": { "parser": "babel" }
+      "options": { "parser": "foo-parser" }
     },
     {
       "files": "*.js",
-      "options": { "parser": "not-babel" }
+      "options": { "parser": "override-js-parser" }
     }
   ]
 }
diff --git a/tests_integration/cli/with-resolve-config/file.bar b/tests_integration/cli/with-resolve-config/file.bar
deleted file mode 100644
index 4f4b4c843..000000000
--- a/tests_integration/cli/with-resolve-config/file.bar
+++ /dev/null
@@ -1 +0,0 @@
-const foo = "bar";
diff --git a/tests_integration/cli/with-resolve-config/file.foo b/tests_integration/cli/with-resolve-config/file.foo
deleted file mode 100644
index 0967ef424..000000000
--- a/tests_integration/cli/with-resolve-config/file.foo
+++ /dev/null
@@ -1 +0,0 @@
-{}