fix(build): prevent hanging when only building

src/frontend/asset.ts

@@ -17,11 +17,11 @@ export = class TSAsset extends JSAsset {
 	}
 
 	public async parse(code: string) {
+		const {options} = this
 		let result: TranspileResult
 
-		// if we are in the main thread let's transpile and check
-		// at the same time
-		if(!process.send) {
+		// if we are not watching let's transpile and check at the same time
+		if(!options.watch) {
 			const [check] = await typeCheck(this.name)
 
 			result = check.transpile()

src/modules.d.ts

@@ -2,6 +2,7 @@ declare module 'parcel-bundler/src/assets/JSAsset' {
 	class JSAsset {
 		public name: string
 		public contents?: string
+		public options?: any
 
 		constructor(name: string, pkg: string, options: any)
 
@@ -24,7 +25,7 @@ declare module 'enhanced-resolve/lib/getInnerRequest' {
 
 	interface Callback {
 		(err?: Error, result?: any): void;
-	
+
 		log?: any;
 		stack?: any;
 		missing?: any;