feat: Template types (#45)

Includes a full implementation of a type-homogeneous Tuple type, using the template types
  feature, as a demonstration/check of its operation.

Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Reviewed-on: #45

test/core/dependencyExtractor.mjs

@@ -0,0 +1,22 @@
+import assert from 'assert'
+import {dependencyExtractor} from '../../src/core/extractors.mjs'
+
+describe('dependencyExtractor', () => {
+   it('will record the keys of a destructuring function', () => {
+      const myfunc = ({a, 'b(x)': b, c: alias}) => 0
+      const params = new Set()
+      myfunc(dependencyExtractor(params))
+      assert.ok(params.has('a'))
+      assert.ok(params.has('b(x)'))
+      assert.ok(params.has('c'))
+      assert.ok(params.size === 3)
+   })
+
+   it('does not pick up anything from a regular function', () => {
+      const myfunc = arg => 0
+      const params = new Set()
+      myfunc(dependencyExtractor(params))
+      assert.ok(params.size === 0)
+   })
+
+})