add 3 recursors

functions/recursors/count-dependencies.js

@@ -0,0 +1,13 @@
+import createRecursor from "../create-recursor"
+import fastclone from "fast-clone"
+
+export let initial = {}
+
+export let createReducer = () =>
+	function reducer (current, name) {
+		let counts = fastclone(current)
+		counts[name] = (counts[name] || 0) + 1
+		return counts
+	}
+
+export default () => createRecursor(createReducer(), initial)

functions/recursors/find-dependents.js

@@ -0,0 +1,13 @@
+import createRecursor from "../create-recursor"
+
+export let initial = []
+
+export let createReducer = target =>
+	function reducer (current, name, info) {
+		let hasRequires = info.requires != null && typeof info.requires == "object"
+		return hasRequires && Object.keys(info.requires).includes(target)
+			? current.concat(name)
+			: current
+	}
+
+export default target => createRecursor(createReducer(target), initial)

functions/recursors/get-longest-name.js

@@ -0,0 +1,12 @@
+import createRecursor from "../create-recursor"
+
+export let initial = ""
+
+export let createReducer = () =>
+	function reducer (longest, name) {
+		return name.length > longest.length
+			? name
+			: longest
+	}
+
+export default () => createRecursor(createReducer(), initial)