Build: migrate most grunt tasks off of grunt (3.x)

Close gh-5330

- lint
- npmcopy
- build, minify, and process for distribution.
- new custom build command using yargs
- compare size of minified/gzip built files
- pretest scripts, including qunit-fixture, babel transpilation, and npmcopy
- node smoke tests
- promises aplus tests
- new watch task using nodemon, which runs `npm run build:all` on `src` changes.

Also:

- upgraded husky and added the new lint command
- updated lint config to use new "flat" config format.
	See https://eslint.org/docs/latest/use/configure/configuration-files-new
- Temporarily disabled one lint rule until flat config is
	supported by eslint-plugin-import.
	See https://github.com/import-js/eslint-plugin-import/issues/2556
- committed package-lock.json
- updated all test scripts to use the new build
- added an express test server that uses middleware-mockserver
	this can be used to run tests without karma
- build-all-variants is now build:all
- run pretest script in jenkins

---------

Co-authored-by: Michał Gołębiowski-Owczarek <m.goleb@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/build/tasks/lib/isCleanWorkingDir.js b/build/tasks/lib/isCleanWorkingDir.js
new file mode 100644
index 000000000..16c87fd9d
--- /dev/null
+++ b/build/tasks/lib/isCleanWorkingDir.js
@@ -0,0 +1,9 @@
+"use strict";
+
+const util = require( "util" );
+const exec = util.promisify( require( "child_process" ).exec );
+
+module.exports = async function isCleanWorkingDir() {
+	const { stdout } = await exec( "git status --untracked-files=no --porcelain" );
+	return !stdout.trim();
+};