fix(meta): add missing null return type to MetaTable.getMetaFor

src/context/source.ts

@@ -8,7 +8,7 @@ export type ProcessAttributeCallback = (
 ) => Iterable<AttributeData>;
 
 export interface ProcessElementContext {
-	getMetaFor(tagName: string): MetaElement;
+	getMetaFor(tagName: string): MetaElement | null;
 }
 
 export type ProcessElementCallback = (

src/meta/table.ts

@@ -158,7 +158,7 @@ export class MetaTable {
 	 *
 	 * @returns A shallow copy of metadata.
 	 */
-	public getMetaFor(tagName: string): MetaElement {
+	public getMetaFor(tagName: string): MetaElement | null {
 		tagName = tagName.toLowerCase();
 		return this.elements[tagName]
 			? Object.assign({}, this.elements[tagName])

src/parser/parser.ts

@@ -21,7 +21,7 @@ import {
 	WhitespaceEvent,
 } from "../event";
 import { Lexer, Token, TokenStream, TokenType } from "../lexer";
-import { MetaTable } from "../meta";
+import { MetaTable, MetaElement } from "../meta";
 import { AttributeData } from "./attribute-data";
 import { parseConditionalComment } from "./conditional-comment";
 import { ParserError } from "./parser-error";
@@ -294,7 +294,7 @@ export class Parser {
 			const processElement = source.hooks.processElement;
 			const metaTable = this.metaTable;
 			const context: ProcessElementContext = {
-				getMetaFor(tagName: string) {
+				getMetaFor(tagName: string): MetaElement | null {
 					return metaTable.getMetaFor(tagName);
 				},
 			};