diff --git a/packages/compiler/src/ml_parser/icu_ast_expander.ts b/packages/compiler/src/ml_parser/icu_ast_expander.ts
index d135ee95a3..3e7d5d15ac 100644
--- a/packages/compiler/src/ml_parser/icu_ast_expander.ts
+++ b/packages/compiler/src/ml_parser/icu_ast_expander.ts
@@ -102,7 +102,7 @@ function _expandPluralForm(ast: html.Expansion, errors: ParseError[]): html.Elem
       'ng-container', [switchAttr], children, ast.sourceSpan, ast.sourceSpan, ast.sourceSpan);
 }
 
-// ICU messages (excluding plural form) are expanded to `NgSwitch`  and `NgSwitychCase`s
+// ICU messages (excluding plural form) are expanded to `NgSwitch`  and `NgSwitchCase`s
 function _expandDefaultForm(ast: html.Expansion, errors: ParseError[]): html.Element {
   const children = ast.cases.map(c => {
     const expansionResult = expandNodes(c.expression);
diff --git a/packages/compiler/src/output/path_util.ts b/packages/compiler/src/output/path_util.ts
index bc262193da..7080a873be 100644
--- a/packages/compiler/src/output/path_util.ts
+++ b/packages/compiler/src/output/path_util.ts
@@ -26,7 +26,7 @@ export abstract class ImportResolver {
   abstract getImportAs(symbol: StaticSymbol): StaticSymbol /*|null*/;
 
   /**
-   * Determine the airty of a type.
+   * Determine the arity of a type.
    */
   abstract getTypeArity(symbol: StaticSymbol): number /*|null*/;
 }