[BUGFIX] Rename the set placeholder helper

addon/helpers/__placeholder__.js → addon/helpers/-set-placeholder.js

@@ -18,8 +18,8 @@ export class Placeholder {
   }
 }
 
-function __placeholder__() {
+function setPlaceholder() {
   return new Placeholder(null);
 }
 
-export default helper(__placeholder__);
+export default helper(setPlaceholder);

addon/helpers/set.js

@@ -1,7 +1,7 @@
 import { helper } from '@ember/component/helper';
 import { assert } from '@ember/debug';
 import { get, set as emberSet } from '@ember/object';
-import { Placeholder } from './__placeholder__';
+import { Placeholder } from './-set-placeholder';
 
 function set(positional) {
   let [target, key, valueOrPlaceholder] = positional;

app/helpers/-set-placeholder.js

@@ -0,0 +1 @@
+export { default } from 'ember-set-helper/helpers/-set-placeholder';

index.js

@@ -5,7 +5,7 @@ module.exports = {
 
   setupPreprocessorRegistry(type, registry) {
     registry.add('htmlbars-ast-plugin', {
-      name: 'bind',
+      name: 'set-placeholder',
       plugin: require('./lib/set-placeholder-transform'),
       baseDir() {
         return __dirname;

lib/set-placeholder-transform.js

@@ -10,8 +10,8 @@
   becomes
 
   ```hbs
-  {{set this "bar" (__placeholder__)}}
-  {{set this.bar "baz" (get (__placeholder__) "qux")}}
+  {{set this "bar" (-set-placeholder)}}
+  {{set this.bar "baz" (get (-set-placeholder) "qux")}}
   ```
 */
 
@@ -22,7 +22,7 @@ module.exports = class SetPlaceholderTransform {
     function recursivelyReplacePlaceholders(expr) {
       expr.params = expr.params.map(node => {
         if (node.type === 'PathExpression' && node.original === '_') {
-          return b.sexpr('__placeholder__');
+          return b.sexpr('-set-placeholder');
         }
 
         if (node.type === 'SubExpression') {