Watcher infrastructure (#1724)

* wip

* Adding chokidar and types

* specifiying build tasks

* new structure, new types, executor and watchers

* Adding log

* Fully implemented watchers

* adapt vscode launc

* Add .babelrc.js to toplevel tsconfig project

* Typo

* Get schema path from .graphqlconfig

* Use watcher binary

* Add joi validation to watcher

* Remove fb-watchman for now

* Use correct ignore path

* Fix dist folder

* Allow setting watcher

* Per default only spawn one process at a time

* Support runOnInit

* Rename RestartingExecutor to LongRunningExecutor

* Use debounce instead of throttle

* Remove console log

* Debounce command execution

* Simplify debounce

* Watcher name change

* Typos

* Rename "watcher" root level config to "backend"

scripts/schemaPath.ts

@@ -0,0 +1,39 @@
+#!/usr/bin/env ts-node
+
+import program from "commander";
+import fs from "fs";
+import path from "path";
+
+const config = JSON.parse(
+  fs.readFileSync(path.resolve(__dirname, "../.graphqlconfig"), "utf8")
+);
+
+program
+  .version("0.1.0")
+  .usage("<project>")
+  .arguments("<project>")
+  .description(
+    "Returns the schema graph in `.graphqlconfig` based on <project>"
+  )
+  .action(project => {
+    if (!config.projects) {
+      // tslint:disable-next-line:no-console
+      console.error("Missing projects key in .graphqconfig");
+      process.exit(1);
+    }
+    if (!config.projects[project]) {
+      // tslint:disable-next-line:no-console
+      console.error(`Project ${project} not found in .graphqconfig`);
+      process.exit(1);
+    }
+    if (!config.projects[project].schemaPath) {
+      // tslint:disable-next-line:no-console
+      console.error(
+        `SchemaPath for project ${project} not found in .graphqconfig`
+      );
+      process.exit(1);
+    }
+    // tslint:disable-next-line:no-console
+    console.log(config.projects[project].schemaPath);
+  })
+  .parse(process.argv);