remove missing prop warning false positives - fixes #1902

src/compile/render-dom/index.ts

@@ -131,10 +131,10 @@ export default function dom(
 		if (expected.length) {
 			dev_props_check = deindent`
 				const { ctx } = this.$$;
+				const props = ${options.customElement ? `this.attributes` : `options.props || {}`};
 				${expected.map(name => deindent`
-
+				if (ctx.${name} === undefined && !('${name}' in props)) {
-				if (ctx.${name} === undefined${options.customElement && ` && !('${name}' in this.attributes)`}) {
+					console.warn("<${component.tag}> was created without expected prop '${name}'");
-					console.warn("<${component.tag}> was created without expected data property '${name}'");
 				}`)}
 			`;
 		}

test/custom-elements/samples/no-missing-prop-warnings/test.js

@@ -12,7 +12,7 @@ export default function (target) {
 	target.innerHTML = '<my-app foo=yes />';
 
 	assert.equal(warnings.length, 1);
-	assert.equal(warnings[0], `<my-app> was created without expected data property 'bar'`);
+	assert.equal(warnings[0], `<my-app> was created without expected prop 'bar'`);
 
 	console.warn = warn;
 }

test/js/samples/debug-empty/expected.js

@@ -70,8 +70,9 @@ class SvelteComponent extends SvelteComponentDev {
 		init(this, options, instance, create_fragment, safe_not_equal);
 
 		const { ctx } = this.$$;
-		if (ctx.name === undefined) {
+		const props = options.props || {};
-			console.warn("<SvelteComponent> was created without expected data property 'name'");
+		if (ctx.name === undefined && !('name' in props)) {
+			console.warn("<SvelteComponent> was created without expected prop 'name'");
 		}
 	}
 

test/js/samples/debug-foo-bar-baz-things/expected.js

@@ -158,17 +158,18 @@ class SvelteComponent extends SvelteComponentDev {
 		init(this, options, instance, create_fragment, safe_not_equal);
 
 		const { ctx } = this.$$;
-		if (ctx.things === undefined) {
+		const props = options.props || {};
-			console.warn("<SvelteComponent> was created without expected data property 'things'");
+		if (ctx.things === undefined && !('things' in props)) {
+			console.warn("<SvelteComponent> was created without expected prop 'things'");
 		}
-		if (ctx.foo === undefined) {
+		if (ctx.foo === undefined && !('foo' in props)) {
-			console.warn("<SvelteComponent> was created without expected data property 'foo'");
+			console.warn("<SvelteComponent> was created without expected prop 'foo'");
 		}
-		if (ctx.bar === undefined) {
+		if (ctx.bar === undefined && !('bar' in props)) {
-			console.warn("<SvelteComponent> was created without expected data property 'bar'");
+			console.warn("<SvelteComponent> was created without expected prop 'bar'");
 		}
-		if (ctx.baz === undefined) {
+		if (ctx.baz === undefined && !('baz' in props)) {
-			console.warn("<SvelteComponent> was created without expected data property 'baz'");
+			console.warn("<SvelteComponent> was created without expected prop 'baz'");
 		}
 	}
 

test/js/samples/debug-foo/expected.js

@@ -156,11 +156,12 @@ class SvelteComponent extends SvelteComponentDev {
 		init(this, options, instance, create_fragment, safe_not_equal);
 
 		const { ctx } = this.$$;
-		if (ctx.things === undefined) {
+		const props = options.props || {};
-			console.warn("<SvelteComponent> was created without expected data property 'things'");
+		if (ctx.things === undefined && !('things' in props)) {
+			console.warn("<SvelteComponent> was created without expected prop 'things'");
 		}
-		if (ctx.foo === undefined) {
+		if (ctx.foo === undefined && !('foo' in props)) {
-			console.warn("<SvelteComponent> was created without expected data property 'foo'");
+			console.warn("<SvelteComponent> was created without expected prop 'foo'");
 		}
 	}
 

test/js/samples/dev-warning-missing-data-computed/expected.js

@@ -76,8 +76,9 @@ class SvelteComponent extends SvelteComponentDev {
 		init(this, options, instance, create_fragment, safe_not_equal);
 
 		const { ctx } = this.$$;
-		if (ctx.foo === undefined) {
+		const props = options.props || {};
-			console.warn("<SvelteComponent> was created without expected data property 'foo'");
+		if (ctx.foo === undefined && !('foo' in props)) {
+			console.warn("<SvelteComponent> was created without expected prop 'foo'");
 		}
 	}
 

test/runtime/samples/dev-warning-missing-data-binding/_config.js

@@ -4,6 +4,6 @@ export default {
 	},
 
 	warnings: [
-		`<Main$> was created without expected data property 'value'`
+		`<Main$> was created without expected prop 'value'`
 	]
 };

test/runtime/samples/dev-warning-missing-data-component/Foo.html

@@ -0,0 +1 @@
+<div>{x} {y}</div>

test/runtime/samples/dev-warning-missing-data-component/_config.js

@@ -0,0 +1,9 @@
+export default {
+	compileOptions: {
+		dev: true
+	},
+
+	warnings: [
+		`<Foo$> was created without expected prop 'y'`
+	]
+};

test/runtime/samples/dev-warning-missing-data-component/main.html

@@ -0,0 +1,5 @@
+<script>
+	import Foo from './Foo.html';
+</script>
+
+<Foo x={undefined}/>

test/runtime/samples/dev-warning-missing-data/_config.js

@@ -4,7 +4,7 @@ export default {
 	},
 
 	warnings: [
-		`<Main$> was created without expected data property 'foo'`,
+		`<Main$> was created without expected prop 'foo'`,
-		`<Main$> was created without expected data property 'bar'`
+		`<Main$> was created without expected prop 'bar'`
 	]
 };