Fixes to syntax typing

Author: Pike

fluent-langneg/src/index.ts

@@ -7,6 +7,8 @@
  *
  */
 
-export {negotiateLanguages, NegotiateLanguagesOptions} from "./negotiate_languages";
+export {
+  negotiateLanguages, NegotiateLanguagesOptions
+} from "./negotiate_languages";
 export {acceptedLanguages} from "./accepted_languages";
 export {filterMatches} from "./matches";

fluent-syntax/src/ast.ts

@@ -87,8 +87,8 @@ export abstract class SyntaxNode extends BaseNode {
 
 export class Resource extends SyntaxNode {
   public type = "Resource" as const;
-  public body: Array<Entry | Junk>;
-  constructor(body: Array<Entry | Junk> = []) {
+  public body: Array<Entry>;
+  constructor(body: Array<Entry> = []) {
     super();
     this.body = body;
   }
@@ -421,7 +421,7 @@ export class Junk extends SyntaxNode {
 }
 
 export class Span extends BaseNode {
-  public type = "Span";
+  public type = "Span" as const;
   public start: number;
   public end: number;
 
@@ -433,7 +433,7 @@ export class Span extends BaseNode {
 }
 
 export class Annotation extends SyntaxNode {
-  public type = "Annotation";
+  public type = "Annotation" as const;
   public code: string;
   public arguments: Array<unknown>;
   public message: string;

fluent-syntax/src/visitor.ts

@@ -93,7 +93,7 @@ export abstract class Transformer extends Visitor {
     return this.genericVisit(node);
   }
 
-  genericVisit(node: AST.BaseNode): AST.BaseNode | undefined {
+  genericVisit(node: AST.BaseNode): AST.BaseNode {
     for (const key of Object.keys(node)) {
       let prop = node[key];
       if (prop instanceof AST.BaseNode) {