feat: drop flowtype support (#412)

BREAKING CHANGE: drop flowytpe support. remove `@cybozu/eslint-config/presets/flowtype`,`@cybozu/eslint-config/presets/flowtype`, and `@cybozu/eslint-config/presets/react-flowtype-prettier`

Author: koba04

.eslintrc.js

@@ -1,8 +1,8 @@
 module.exports = {
   root: true,
-  extends: "./presets/react-flowtype-prettier.js",
+  extends: "./presets/react-typescript-prettier.js",
   env: {
     node: true,
-    mocha: true
-  }
+    mocha: true,
+  },
 };

README.md

@@ -85,10 +85,6 @@ module.exports = {
   - ⚠️ A11y rules are being defined as warnings, which is an experimental so we might change the rules in later
 - `@cybozu/eslint-config/presets/react-typescript`
   - Including `@cybozu/eslint-config/presets/typescript` and `@cybozu/eslint-config/presets/react`
-- `@cybozu/eslint-config/presets/flowtype`
-  - Including `eslint-plugin-flowtype`
-- `@cybozu/eslint-config/presets/react-flowtype`
-  - Including `@cybozu/eslint-config/presets/react` and `eslint-plugin-flowtype`
 - `@cybozu/eslint-config/presets/es5`
 
 ## Prettier Support
@@ -114,7 +110,6 @@ In order to this, you have to install `prettier` and choose a preset from the fo
 - `@cybozu/eslint-config/presets/typescript-prettier`
 - `@cybozu/eslint-config/presets/react-typescript-prettier`
 - `@cybozu/eslint-config/presets/react-prettier`
-- `@cybozu/eslint-config/presets/react-flowtype-prettier`
 - `@cybozu/eslint-config/presets/es5-prettier`
 
 **Currently, we don't support customized Prettier config**

lib/flowtype.js

@@ -45,7 +45,6 @@
     "@typescript-eslint/parser": "^4.22.0",
     "babel-eslint": "^10.1.0",
     "eslint-config-prettier": "^8.1.0",
-    "eslint-plugin-flowtype": "^5.4.0",
     "eslint-plugin-import": "^2.22.1",
     "eslint-plugin-jsx-a11y": "^6.4.1",
     "eslint-plugin-node": "^11.1.0",

package-lock.json

@@ -24,30 +24,6 @@ describe("presets", () => {
       );
     });
   });
-  describe("flowtype", () => {
-    it("should be able to use flowtype as well as lib/base and lib/flowtype", async () => {
-      assert.deepStrictEqual(
-        await runLintWithFixtures("flowtype"),
-        await runLintWithFixtures("flowtype", "presets/flowtype.js")
-      );
-      assert.deepStrictEqual(
-        await runLintWithFixtures("base"),
-        await runLintWithFixtures("base", "presets/flowtype.js")
-      );
-    });
-  });
-  describe("react-flowtype", () => {
-    it("should be able to use react-flowtype as well as lib/react and lib/flowtype", async () => {
-      assert.deepStrictEqual(
-        await runLintWithFixtures("react", "presets/react.js"),
-        await runLintWithFixtures("react", "presets/react-flowtype.js")
-      );
-      assert.deepStrictEqual(
-        await runLintWithFixtures("flowtype"),
-        await runLintWithFixtures("flowtype", "presets/react-flowtype.js")
-      );
-    });
-  });
   describe("node", () => {
     it("should be able to use node as well as lib/node", async () => {
       assert.deepStrictEqual(
@@ -92,17 +68,6 @@ describe("presets", () => {
       );
     });
   });
-  describe("react-flowtype-prettier", () => {
-    it("should be able to use react-flowtype-prettier as well as lib/prettier", async () => {
-      assert.deepStrictEqual(
-        await runLintWithFixtures("prettier"),
-        await runLintWithFixtures(
-          "prettier",
-          "presets/react-flowtype-prettier.js"
-        )
-      );
-    });
-  });
   describe("node-prettier", () => {
     it("should be able to use node-prettier as well as lib/prettier", async () => {
       assert.deepStrictEqual(