Move some build steps to gulp (#12127)

* chore: move generate-standalone to gulp tasks

* move build-flow-typings to gulp tasks

* chore: move build-typescript-typings to gulp tasks

* move generate-type-helpers to gulp tasks

* chore: include build-typings and generate-type-helpers in gulp build

* update generate-standalone comments

* address review comments

* chore: revert build-typings refactor

* fix: run build-typings in build-no-bundle

packages/babel-types/scripts/generateTypeHelpers.js

@@ -1,29 +0,0 @@
-"use strict";
-const path = require("path");
-const chalk = require("chalk");
-const generateBuilders = require("./generators/generateBuilders");
-const generateValidators = require("./generators/generateValidators");
-const generateAsserts = require("./generators/generateAsserts");
-const generateConstants = require("./generators/generateConstants");
-const format = require("../../../scripts/utils/formatCode");
-const writeFile = require("../../../scripts/utils/writeFileAndMkDir");
-
-const baseDir = path.join(__dirname, "../src");
-
-console.log("Generating @babel/types dynamic functions");
-
-const buildersFile = path.join(baseDir, "builders/generated/index.js");
-writeFile(buildersFile, format(generateBuilders(), buildersFile));
-console.log(`  ${chalk.green("✔")} Generated builders`);
-
-const validatorsFile = path.join(baseDir, "validators/generated/index.js");
-writeFile(validatorsFile, format(generateValidators(), validatorsFile));
-console.log(`  ${chalk.green("✔")} Generated validators`);
-
-const assertsFile = path.join(baseDir, "asserts/generated/index.js");
-writeFile(assertsFile, format(generateAsserts(), assertsFile));
-console.log(`  ${chalk.green("✔")} Generated asserts`);
-
-const constantsFile = path.join(baseDir, "constants/generated/index.js");
-writeFile(constantsFile, format(generateConstants(), constantsFile));
-console.log(`  ${chalk.green("✔")} Generated constants`);