feat(cli-core): add a new package for cli in TypeScript

packages/cli-core/.npmrc

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+package-lock=true

packages/cli-core/LICENSE

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+Copyright (c) IBM Corp. 2020.
+Node module: @loopback/cli-core
+This project is licensed under the MIT License, full text below.
+
+--------
+
+MIT License
+
+MIT License Copyright (c) IBM Corp. 2020
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

packages/cli-core/README.md

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+# @loopback/cli-core
+
+[![LoopBack](<https://github.com/strongloop/loopback-next/raw/master/docs/site/imgs/branding/Powered-by-LoopBack-Badge-(blue)[email protected]>)](http://loopback.io/)

packages/cli-core/bin/cli-main.js

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+#!/usr/bin/env node
+// Copyright IBM Corp. 2018,2020. All Rights Reserved.
+// Node module: @loopback/cli
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+'use strict';
+
+const pkg = require('../package.json');
+const semver = require('semver');
+
+// Make sure node version meets the requirement. This code intentionally only
+// uses ES5 features so that it can be run with lower versions of Node
+// to report the version requirement.
+const nodeVer = process.versions.node;
+const requiredVer = pkg.engines.node;
+const ok = semver.satisfies(nodeVer, requiredVer);
+if (!ok) {
+  const format = 'Node.js %s is not supported. Please use a version %s.';
+  console.error(format, nodeVer, requiredVer);
+  process.exit(1);
+}
+
+// Intentionally have a separate `main.js` which can use JS features
+// supported by required version of Node
+const minimist = require('minimist');
+const {main} = require('../dist/cli');
+const opts = minimist(process.argv.slice(2), {
+  alias: {
+    version: 'v', // --version or -v: print versions
+    commands: 'l', // --commands or -l: print commands
+    help: 'h', // --help or -l: print help
+  },
+});
+
+const updateNotifier = require('update-notifier');
+// Force version check with `lb4 --version`
+const interval = opts.version ? 0 : undefined;
+updateNotifier({
+  pkg: pkg,
+  updateCheckInterval: interval,
+}).notify({isGlobal: true});
+
+main(opts).catch(err => {
+  console.error(err);
+  process.exit(1);
+});

packages/cli-core/index.d.ts

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+// Copyright IBM Corp. 2020. All Rights Reserved.
+// Node module: @loopback/cli-core
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+export * from './dist';

packages/cli-core/index.js

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+// Copyright IBM Corp. 2020. All Rights Reserved.
+// Node module: @loopback/cli-core
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+module.exports = require('./dist');

packages/cli-core/index.ts

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+// Copyright IBM Corp. 2020. All Rights Reserved.
+// Node module: @loopback/cli-core
+// This file is licensed under the MIT License.
+// License text available at https://opensource.org/licenses/MIT
+
+export * from './src';