Add assertion

Andy Hanson · Andy Hanson · commit 52d830f6a517 · 2018-02-22T08:07:52.000-08:00
diff --git a/src/compiler/utilities.ts b/src/compiler/utilities.ts
@@ -4300,7 +4300,9 @@ namespace ts {
 
     /** @internal */
     export function isNamedDeclaration(node: Node): node is NamedDeclaration & { name: DeclarationName } {
-        return !!(node as NamedDeclaration).name;
+        const name = (node as NamedDeclaration).name;
+        Debug.assert(!name || isDeclaration(node) && node.name === name, "A 'name' property should always be a DeclarationName.");
+        return !!name;
     }
 
     export function getNameOfDeclaration(declaration: Declaration | Expression): DeclarationName | undefined {

Original file line number	Diff line number	Diff line change
`@@ -4300,7 +4300,9 @@ namespace ts {`
`4300`	`4300`
`4301`	`4301`	`/** @internal */`
`4302`	`4302`	`export function isNamedDeclaration(node: Node): node is NamedDeclaration & { name: DeclarationName } {`
`4303`		`- return !!(node as NamedDeclaration).name;`
	`4303`	`+ const name = (node as NamedDeclaration).name;`
	`4304`	`+ Debug.assert(!name \|\| isDeclaration(node) && node.name === name, "A 'name' property should always be a DeclarationName.");`
	`4305`	`+ return !!name;`
`4304`	`4306`	`}`
`4305`	`4307`
`4306`	`4308`	`export function getNameOfDeclaration(declaration: Declaration \| Expression): DeclarationName \| undefined {`