add shared prototype

src/generators/dom/index.js

@@ -363,20 +363,20 @@ export default function dom ( parsed, source, options, names ) {
 		}
 	` );
 
-	if ( templateProperties.methods ) {
-		builders.main.addBlock( `${name}.prototype = template.methods;` );
-	}
-
 	const sharedPath = options.shared === true ? 'svelte/shared.js' : options.shared;
 
-	[ 'get', 'fire', 'observe', 'on', 'set', '_flush' ].forEach( methodName => {
-		if ( sharedPath ) {
-			builders.main.addLine( `${name}.prototype.${methodName} = ${generator.helper( methodName )};` );
-		} else {
-			const fn = shared[ options.dev && `${methodName}Dev` in shared ? `${methodName}Dev` : methodName ]; // eslint-disable-line import/namespace
-			builders.main.addLine( `${name}.prototype.${methodName} = ${fn};` );
+	if ( sharedPath ) {
+		const base = templateProperties.methods ? `{}, template.methods` : `{}`;
+		builders.main.addBlock( `${name}.prototype = Object.assign( ${base}, ${generator.helper( 'proto' )} );` );
+	} else {
+		if ( templateProperties.methods ) {
+			builders.main.addBlock( `${name}.prototype = template.methods;` );
 		}
-	});
+
+		[ 'get', 'fire', 'observe', 'on', 'set', '_flush' ].forEach( methodName => {
+			builders.main.addLine( `${name}.prototype.${methodName} = ${generator.helper( methodName )};` );
+		});
+	}
 
 	// TODO deprecate component.teardown()
 	builders.main.addBlock( deindent`
@@ -415,4 +415,4 @@ export default function dom ( parsed, source, options, names ) {
 	}
 
 	return generator.generate( builders.main.toString(), options, { name, format } );
-}
+}

src/shared/methods.js

@@ -101,3 +101,21 @@ export function _flush () {
 		hook.fn.call( hook.context );
 	}
 }
+
+export var proto = {
+	get: get,
+	fire: fire,
+	observe: observe,
+	on: on,
+	set: set,
+	_flush: _flush
+};
+
+export var protoDev = {
+	get: get,
+	fire: fire,
+	observe: observeDev,
+	on: onDev,
+	set: set,
+	_flush: _flush
+};