add support for new output option jsonpScriptType

lib/JsonpMainTemplatePlugin.js

@@ -29,6 +29,7 @@ class JsonpMainTemplatePlugin {
 			const chunkMaps = chunk.getChunkMaps();
 			const crossOriginLoading = this.outputOptions.crossOriginLoading;
 			const chunkLoadTimeout = this.outputOptions.chunkLoadTimeout;
+			const jsonpScriptType = this.outputOptions.jsonpScriptType || 'text/javascript';
 			const scriptSrcPath = this.applyPluginsWaterfall("asset-path", JSON.stringify(chunkFilename), {
 				hash: `" + ${this.renderCurrentHashCode(hash)} + "`,
 				hashWithLength: length => `" + ${this.renderCurrentHashCode(hash, length)} + "`,
@@ -48,7 +49,7 @@ class JsonpMainTemplatePlugin {
 			});
 			return this.asString([
 				"var script = document.createElement('script');",
-				"script.type = 'text/javascript';",
+				`script.type = '${jsonpScriptType}';`,
 				"script.charset = 'utf-8';",
 				"script.async = true;",
 				`script.timeout = ${chunkLoadTimeout};`,

schemas/webpackOptionsSchema.json

@@ -314,6 +314,13 @@
             "use-credentials"
           ]
         },
+        "jsonpScriptType": {
+          "description": "This option enables loading async chunks via a custom script type, such as script type=\"module\"",
+          "enum": [
+            "text/javascript",
+            "module"
+          ]
+        },
         "chunkLoadTimeout": {
           "description": "Number of milliseconds before chunk request expires",
           "type": "number"