diff --git a/src/utils/namespaces.js b/src/utils/namespaces.js
index 2ab0b116f0..595d0f0def 100644
--- a/src/utils/namespaces.js
+++ b/src/utils/namespaces.js
@@ -5,4 +5,9 @@ export const xlink  = 'http://www.w3.org/1999/xlink';
 export const xml    = 'http://www.w3.org/XML/1998/namespace';
 export const xmlns  = 'http://www.w3.org/2000/xmlns';
 
+export const validNamespaces = [
+	'html', 'mathml', 'svg', 'xlink', 'xml', 'xmlns',
+	html, mathml, svg, xlink, xml, xmlns
+];
+
 export default { html, mathml, svg, xlink, xml, xmlns };
diff --git a/src/validate/html/index.js b/src/validate/html/index.js
index 2e831ee9c1..f54c4d4fe5 100644
--- a/src/validate/html/index.js
+++ b/src/validate/html/index.js
@@ -18,7 +18,7 @@ export default function validateHtml ( validator, html ) {
 			node.children.forEach( visit );
 		}
 
-		if (node.else ) {
+		if ( node.else ) {
 			visit( node.else );
 		}
 
diff --git a/src/validate/index.js b/src/validate/index.js
index e1e536f4bd..4efdee8d47 100644
--- a/src/validate/index.js
+++ b/src/validate/index.js
@@ -36,7 +36,9 @@ export default function validate ( parsed, source, { onerror, onwarn, name, file
 			});
 		},
 
-		namespace: null
+		namespace: null,
+		defaultExport: null,
+		properties: {}
 	};
 
 	if ( name && !/^[a-zA-Z_$][a-zA-Z_$0-9]*$/.test( name ) ) {
diff --git a/src/validate/js/index.js b/src/validate/js/index.js
index cdef266c96..d0fc396320 100644
--- a/src/validate/js/index.js
+++ b/src/validate/js/index.js
@@ -23,19 +23,19 @@ export default function validateJs ( validator, js ) {
 			checkForComputedKeys( validator, node.declaration.properties );
 			checkForDupes( validator, node.declaration.properties );
 
-			const templateProperties = {};
+			const props = validator.properties;
 
 			node.declaration.properties.forEach( prop => {
-				templateProperties[ prop.key.name ] = prop;
+				props[ prop.key.name ] = prop;
 			});
 
 			// Remove these checks in version 2
-			if ( templateProperties.oncreate && templateProperties.onrender ) {
-				validator.error( 'Cannot have both oncreate and onrender', templateProperties.onrender.start );
+			if ( props.oncreate && props.onrender ) {
+				validator.error( 'Cannot have both oncreate and onrender', props.onrender.start );
 			}
 
-			if ( templateProperties.ondestroy && templateProperties.onteardown ) {
-				validator.error( 'Cannot have both ondestroy and onteardown', templateProperties.onteardown.start );
+			if ( props.ondestroy && props.onteardown ) {
+				validator.error( 'Cannot have both ondestroy and onteardown', props.onteardown.start );
 			}
 
 			// ensure all exported props are valid
@@ -56,8 +56,8 @@ export default function validateJs ( validator, js ) {
 				}
 			});
 
-			if ( templateProperties.namespace ) {
-				const ns = templateProperties.namespace.value.value;
+			if ( props.namespace ) {
+				const ns = props.namespace.value.value;
 				validator.namespace = namespaces[ ns ] || ns;
 			}
 
diff --git a/src/validate/js/propValidators/namespace.js b/src/validate/js/propValidators/namespace.js
index ca664261ef..ec8bad0a04 100644
--- a/src/validate/js/propValidators/namespace.js
+++ b/src/validate/js/propValidators/namespace.js
@@ -1,5 +1,22 @@
+import * as namespaces from '../../../utils/namespaces.js';
+import FuzzySet from '../utils/FuzzySet.js';
+
+const fuzzySet = new FuzzySet( namespaces.validNamespaces );
+const valid = new Set( namespaces.validNamespaces );
+
 export default function namespace ( validator, prop ) {
-	if ( prop.value.type !== 'Literal' || typeof prop.value.value !== 'string' ) {
+	const ns = prop.value.value;
+
+	if ( prop.value.type !== 'Literal' || typeof ns !== 'string' ) {
 		validator.error( `The 'namespace' property must be a string literal representing a valid namespace`, prop.start );
 	}
+
+	if ( !valid.has( ns ) ) {
+		const matches = fuzzySet.get( ns );
+		if ( matches && matches[0] && matches[0][0] > 0.7 ) {
+			validator.error( `Invalid namespace '${ns}' (did you mean '${matches[0][1]}'?)`, prop.start );
+		} else {
+			validator.error( `Invalid namespace '${ns}'`, prop.start );
+		}
+	}
 }
diff --git a/test/validator/samples/namespace-invalid/errors.json b/test/validator/samples/namespace-invalid/errors.json
new file mode 100644
index 0000000000..b7f6d4d898
--- /dev/null
+++ b/test/validator/samples/namespace-invalid/errors.json
@@ -0,0 +1,8 @@
+[{
+	"message": "Invalid namespace 'http://www.w3.org/1999/svg' (did you mean 'http://www.w3.org/2000/svg'?)",
+	"pos": 29,
+	"loc": {
+		"line": 3,
+		"column": 2
+	}
+}]
diff --git a/test/validator/samples/namespace-invalid/input.html b/test/validator/samples/namespace-invalid/input.html
new file mode 100644
index 0000000000..a2e5baf39b
--- /dev/null
+++ b/test/validator/samples/namespace-invalid/input.html
@@ -0,0 +1,5 @@
+<script>
+	export default {
+		namespace: 'http://www.w3.org/1999/svg'
+	};
+</script>
\ No newline at end of file