@seznam/compose-react-refs - npm Package Compare versions

Comparing version 1.0.4 to 1.0.5

composeRefs.ts

+import {MutableRefObject, Ref} from 'react'
+
+type OptionalRef<T> = Ref<T> | undefined
+
+export default function composeRefs<T>(...refs: [OptionalRef<T>, OptionalRef<T>, ...Array<OptionalRef<T>>]): Ref<T> {
+  if (refs.length === 2) { // micro-optimize the hot path
+    return composeTwoRefs(refs[0], refs[1]) || null
+  }
+
+  const composedRef = refs.slice(1).reduce(
+    (semiCombinedRef: OptionalRef<T>, refToInclude: OptionalRef<T>) => composeTwoRefs(semiCombinedRef, refToInclude),
+    refs[0],
+  )
+  return composedRef || null
+}
+
+type NonNullRef<T> = NonNullable<Ref<T>>
+const composedRefCache = new WeakMap<NonNullRef<unknown>, WeakMap<NonNullRef<unknown>, NonNullRef<unknown>>>()
+
+function composeTwoRefs<T>(ref1: OptionalRef<T>, ref2: OptionalRef<T>): OptionalRef<T> {
+  if (ref1 && ref2) {
+    const ref1Cache = composedRefCache.get(ref1) || new WeakMap<NonNullRef<unknown>, NonNullRef<unknown>>()
+    composedRefCache.set(ref1, ref1Cache)
+
+    const composedRef = ref1Cache.get(ref2) || ((instance: T): void => {
+      updateRef(ref1, instance)
+      updateRef(ref2, instance)
+    })
+    ref1Cache.set(ref2, composedRef)
+
+    return composedRef as NonNullRef<T>
+  }
+
+  if (!ref1) {
+    return ref2
+  } else {
+    return ref1
+  }
+}
+
+function updateRef<T>(ref: NonNullRef<T>, instance: null | T): void {
+  if (typeof ref === 'function') {
+    ref(instance)
+  } else {
+    (ref as MutableRefObject<T | null>).current = instance
+  }
+}

composeRefs.d.ts.map

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composeRefs.js.map

@@ -1,1 +0,1 @@
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package.json

 {
   "name": "@seznam/compose-react-refs",
-  "version": "1.0.4",
+  "version": "1.0.5",
   "description": "A simple utility for composing two or more react refs into a single callback ref.",
   "main": "composeRefs.js",
   "scripts": {
-    "build": "rm -rf dist/ && npm test && npm run compile && cp LICENSE package.json README.md dist/",
+    "build": "rm -rf dist/ && npm test && npm run compile && cp LICENSE package.json README.md composeRefs.ts dist/",
     "compile": "tsc --project .",
@@ -9,0 +9,0 @@ "prepublishOnly": "echo 'Run \\'npm run publish-package\\' instead' && exit 1",

No alert changes

Improved metrics

Total package byte prevSize

9456

18.11%

Number of package files

8

14.29%

Lines of code

83

84.44%

No dependency changes