Typescriptify the main process code (14/N)

Summary: Converted scripts/yarn-install.js to typescript

Reviewed By: passy

Differential Revision: D20098071

fbshipit-source-id: be56a95a11089cd857efb00e62866213a88b739c

.vscode/launch.json

@@ -27,7 +27,16 @@
     "type": "node",
     "request": "launch",
     "name": "Launch Current Script",
-    "program": "${file}",
+    "args": ["${file}"],
+    "env": {
+      "TS_NODE_FILES": "true",
+    },
+    "protocol": "inspector",
+    "internalConsoleOptions": "openOnSessionStart",
+    "runtimeArgs": [
+      "--require",
+      "ts-node/register"
+    ],
     "cwd": "${workspaceFolder}"
  }
   ],

package.json

@@ -211,7 +211,7 @@
   },
   "scripts": {
     "preinstall": "yarn config set ignore-engines",
-    "postinstall": "node scripts/yarn-install.js && patch-package",
+    "postinstall": "cross-env TS_NODE_FILES=true node --require ts-node/register scripts/yarn-install.ts && patch-package",
     "rm-dist": "rimraf dist",
     "rm-modules": "rimraf node_modules static/node_modules",
     "rm-temp": "rimraf $TMPDIR/jest* $TMPDIR/react-native-packager*",
@@ -222,7 +222,7 @@
     "start:no-embedded-plugins": "cross-env NODE_ENV=development cross-env FLIPPER_NO_EMBEDDED_PLUGINS=true TS_NODE_FILES=true node --require ts-node/register scripts/start-dev-server.ts",
     "build": "yarn rm-dist && cross-env NODE_ENV=production TS_NODE_FILES=true node --require ts-node/register scripts/build-release.ts $@",
     "build-headless": "yarn rm-dist && mkdir dist && cross-env NODE_ENV=production TS_NODE_FILES=true node --require ts-node/register scripts/build-headless.ts $@",
-    "fix": "eslint . --fix --ext .js,.tsx",
+    "fix": "eslint . --fix --ext .js,.ts,.tsx",
     "test": "jest --testPathPattern=\"node\\.(js|tsx)$\" --no-cache",
     "test:debug": "node --inspect node_modules/.bin/jest --runInBand",
     "test-electron": "jest --testPathPattern=\"electron\\.(js|tsx)$\" --testEnvironment=@jest-runner/electron/environment --runner=@jest-runner/electron --no-cache",

scripts/yarn-install.ts

@@ -7,10 +7,12 @@
  * @format
  */
 
-const path = require('path');
-const util = require('util');
-const glob = util.promisify(require('glob'));
-const exec = util.promisify(require('child_process').exec);
+import path from 'path';
+import util from 'util';
+import globImport from 'glob';
+import {exec as execImport} from 'child_process';
+const glob = util.promisify(globImport);
+const exec = util.promisify(execImport);
 const PACKAGES = [
   'headless-tests',
   'static',
@@ -30,9 +32,11 @@ Promise.all(
   ),
 )
   .then(async packages => {
-    packages = packages.reduce((acc, cv) => acc.concat(cv), []);
-    console.log(`Installing dependencies for ${packages.length} plugins`);
-    for (const pkg of packages) {
+    const flattenPackages = packages.reduce((acc, cv) => acc.concat(cv), []);
+    console.log(
+      `Installing dependencies for ${flattenPackages.length} plugins`,
+    );
+    for (const pkg of flattenPackages) {
       const {stderr} = await exec(
         // This script is itself executed by yarn (as postinstall script),
         // therefore another yarn instance is running, while we are trying to