flow like the river

BACK_BACK/node_modules/parcel-bundler/lib/packagers/index.js

@@ -0,0 +1,42 @@
+"use strict";
+
+const JSConcatPackager = require('./JSConcatPackager');
+
+const JSPackager = require('./JSPackager');
+
+const CSSPackager = require('./CSSPackager');
+
+const HTMLPackager = require('./HTMLPackager');
+
+const SourceMapPackager = require('./SourceMapPackager');
+
+const RawPackager = require('./RawPackager');
+
+class PackagerRegistry {
+  constructor(options) {
+    this.packagers = new Map();
+    this.add('css', CSSPackager);
+    this.add('html', HTMLPackager);
+    this.add('map', SourceMapPackager);
+    this.add('js', options.scopeHoist ? JSConcatPackager : JSPackager);
+  }
+
+  add(type, packager) {
+    if (typeof packager === 'string') {
+      packager = require(packager);
+    }
+
+    this.packagers.set(type, packager);
+  }
+
+  has(type) {
+    return this.packagers.has(type);
+  }
+
+  get(type) {
+    return this.packagers.get(type) || RawPackager;
+  }
+
+}
+
+module.exports = PackagerRegistry;