append-transform - npm Package Compare versions

Comparing version 0.2.2 to 0.3.0

index.js

@@ -8,3 +8,4 @@ 'use strict';
 function appendTransform(transform, ext, extensions) {
-	var key = __dirname + count;
+	// Generate a unique key for this transform
+	var key = __dirname + count; // eslint-disable-line
 	count++;
@@ -17,3 +18,3 @@ ext = ext || '.js';
 
-	var descriptor = Object.getOwnPropertyDescriptor(extensions, ext);
+	var descriptor = Object.getOwnPropertyDescriptor(extensions, ext) || {value: undefined, configurable: true};
 
@@ -28,2 +29,3 @@ if (
 	if (descriptor.get) {
+		// wrap a previous append-transform install and pass through to the getter/setter pair it created
 		forwardGet = function () {
@@ -46,4 +48,12 @@ return descriptor.get();
 
+	function hookWasUndefined(module, filename) {
+		throw new Error('Can not load ' + filename + '. No require extension has been installed for ' + ext + ' files');
+	}
+
 	function wrapCustomHook(hook) {
+		if (hook === undefined) {
+			return hookWasUndefined;
+		}
 		return function (module, filename) {
+			// We wrap every added extension, but we only apply the transform to the one on top of the stack
 			if (!module[key]) {
@@ -75,2 +85,3 @@ module[key] = true;
 		} else {
+			// we have already scene this hook, and it is being reverted (proxyquire, etc) - don't wrap again.
 			hooks.splice(restoreIndex + 1, hooks.length);
@@ -77,0 +88,0 @@ forwardSet(hook);

package.json

 {
   "name": "append-transform",
-  "version": "0.2.2",
+  "version": "0.3.0",
   "description": "Install a transform to `require.extensions` that always runs last, even if additional extensions are added later.",
@@ -5,0 +5,0 @@ "license": "MIT",

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Improved metrics

Total package byte prevSize

7865

increased by8.83%

Lines of code

77

increased by14.93%

No dependency changes