Add prettier script

Copies over the prettier script from the React repo with a few tiny tweaks for a 
nicer experience running prettier on changed files

compiler/.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
           cache-dependency-path: forget/yarn.lock
       - run: yarn install --immutable --immutable-cache
         working-directory: forget
-      - run: yarn prettier --check .
+      - run: yarn prettier:ci
         working-directory: forget
       - run: yarn build
         working-directory: forget

compiler/forget/.prettierignore

@@ -2,4 +2,8 @@
 **/dist
 **/__tests__/fixtures/**/*.expect.md
 **/.next
-/test262
+test262/
+*.md
+*.json
+*.css
+*.webmanifest

compiler/forget/.prettierrc.json

@@ -1,3 +1,4 @@
 {
-  "requirePragma": false
+  "requirePragma": false,
+  "parser": "babel-ts"
 }

compiler/forget/package.json

@@ -16,7 +16,10 @@
     "ts:analyze-trace": "scripts/ts-analyze-trace.sh",
     "test262": "yarn run --silent test262-harness --preprocessor=scripts/test262-preprocessor.js",
     "test262:all": "yarn run --silent test262 'test262/test/**/*.js'",
-    "test262:ci": "scripts/test262.sh"
+    "test262:ci": "scripts/test262.sh",
+    "prettier": "node ./scripts/prettier.js write-changed",
+    "prettier:all": "node ./scripts/prettier.js write",
+    "prettier:ci": "prettier --check ."
   },
   "repository": {
     "type": "git",
@@ -47,8 +50,10 @@
     "@types/jest": "^29.0.3",
     "@types/node": "^18.7.18",
     "babel-jest": "^29.0.3",
+    "chalk": "^3.0.0",
     "concurrently": "^7.4.0",
     "eslint": "^8.25.0",
+    "glob": "^7.1.6",
     "hermes-eslint": "^0.9.0",
     "jest": "^29.0.3",
     "jest-environment-jsdom": "^29.0.3",

compiler/forget/scripts/prettier.js

@@ -0,0 +1,85 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+"use strict";
+
+// Based on similar script in React
+// https://github.com/facebook/react/blob/main/scripts/prettier/index.js
+
+const chalk = require("chalk");
+const glob = require("glob");
+const prettier = require("prettier");
+const fs = require("fs");
+const listChangedFiles = require("./shared/list-changed-files");
+const prettierConfigPath = require.resolve("../.prettierrc");
+
+const mode = process.argv[2] || "check";
+const shouldWrite = mode === "write" || mode === "write-changed";
+const onlyChanged = mode === "check-changed" || mode === "write-changed";
+
+const changedFiles = onlyChanged ? listChangedFiles() : null;
+let didWarn = false;
+let didError = false;
+
+const files = glob
+  .sync("**/*.js", {
+    ignore: [
+      "**/node_modules/**",
+      "packages/demo-2021Q3/**",
+      "packages/demo-todolist-live/**",
+      "packages/demo-todolist-next/**",
+      "packages/demo-todolist-playground/**",
+      "packages/eslint-browser/**",
+      "test262/**",
+    ],
+  })
+  .filter((f) => !onlyChanged || changedFiles.has(f));
+
+if (!files.length) {
+  return;
+}
+
+files.forEach((file) => {
+  const options = prettier.resolveConfig.sync(file, {
+    config: prettierConfigPath,
+  });
+  try {
+    const input = fs.readFileSync(file, "utf8");
+    if (shouldWrite) {
+      const output = prettier.format(input, options);
+      if (output !== input) {
+        fs.writeFileSync(file, output, "utf8");
+      }
+    } else {
+      if (!prettier.check(input, options)) {
+        if (!didWarn) {
+          console.log(
+            "\n" +
+              chalk.red(
+                `  This project uses prettier to format all JavaScript code.\n`
+              ) +
+              chalk.dim(`    Please run `) +
+              chalk.reset("yarn prettier:all") +
+              chalk.dim(
+                ` and add changes to files listed below to your commit:`
+              ) +
+              `\n\n`
+          );
+          didWarn = true;
+        }
+        console.log(file);
+      }
+    }
+  } catch (error) {
+    didError = true;
+    console.log("\n\n" + error.message);
+    console.log(file);
+  }
+});
+
+if (didWarn || didError) {
+  process.exitCode = 1;
+}

compiler/forget/scripts/shared/list-changed-files.js

@@ -0,0 +1,32 @@
+/**
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+"use strict";
+
+const execFileSync = require("child_process").execFileSync;
+
+const exec = (command, args) => {
+  console.log("> " + [command].concat(args).join(" "));
+  const options = {
+    cwd: process.cwd(),
+    env: process.env,
+    stdio: "pipe",
+    encoding: "utf-8",
+  };
+  return execFileSync(command, args, options);
+};
+
+const execGitCmd = (args) => exec("git", args).trim().toString().split("\n");
+
+const listChangedFiles = () => {
+  const mergeBase = execGitCmd(["merge-base", "HEAD", "main"]);
+  return new Set([
+    ...execGitCmd(["diff", "--name-only", "--diff-filter=ACMRTUB", mergeBase]),
+    ...execGitCmd(["ls-files", "--others", "--exclude-standard"]),
+  ]);
+};
+
+module.exports = listChangedFiles;

compiler/forget/yarn.lock

@@ -1464,6 +1464,14 @@ chalk@^2.0.0:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
+chalk@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-3.0.0.tgz#3f73c2bf526591f574cc492c51e2456349f844e4"
+  integrity sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==
+  dependencies:
+    ansi-styles "^4.1.0"
+    supports-color "^7.1.0"
+
 chalk@^4.0.0, chalk@^4.1.0:
   version "4.1.2"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.1.2.tgz#aac4e2b7734a740867aeb16bf02aad556a1e7a01"
@@ -2172,7 +2180,7 @@ glob-parent@^6.0.1:
   dependencies:
     is-glob "^4.0.3"
 
-glob@^7.1.3, glob@^7.1.4:
+glob@^7.1.3, glob@^7.1.4, glob@^7.1.6:
   version "7.2.3"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.2.3.tgz#b8df0fb802bbfa8e89bd1d938b4e16578ed44f2b"
   integrity sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==