Fix typos

Author: spydon

README.md

@@ -6,7 +6,7 @@ A Dart Tiled library.
 
 ## Install from Dart Pub Repository
 
-To include the package as a depencency in your `pubspec.yaml`, run the following (or add it manually):
+To include the package as a dependency in your `pubspec.yaml`, run the following (or add it manually):
 
 ```sh
 dart pub add tiled
@@ -29,7 +29,7 @@ Load a TMX file into a string by any means, and then pass the string to TileMapP
     final TiledMap mapTmx = TileMapParser.parseTmx(tmxBody);
 ```
 
-If your tmx file includes a external tsx reference, you have to add a CustomParser
+If your tmx file includes an external tsx reference, you have to add a CustomParser
 ```dart
 class CustomTsxProvider extends TsxProvider {
   @override

packages/tiled/lib/src/common/property.dart

@@ -195,7 +195,7 @@ class IntProperty extends Property<int> {
   }) : super(type: PropertyType.int);
 }
 
-/// [value] is the double-percision floating-point number
+/// [value] is the double-precision floating-point number
 class FloatProperty extends Property<double> {
   FloatProperty({
     required super.name,

packages/tiled/lib/src/objects/tiled_object.dart

@@ -109,7 +109,7 @@ class TiledObject {
     final gid = parser.getIntOrNull('gid');
     final name = parser.getString('name', defaults: '');
 
-    // Tiled 1.9 and above versions running in compatibilty mode set to
+    // Tiled 1.9 and above versions running in compatibility mode set to
     // "Tiled 1.8" will still write out "Class" property as "type". So try both
     // before using default value.
     final type = parser.getString(

packages/tiled/lib/src/tsx_provider.dart

@@ -10,7 +10,7 @@ abstract class TsxProvider {
   Parser getSource(String filename);
 
   /// Used when provider implementations cache the data. Returns the cached
-  /// data for the exernal tileset.
+  /// data for the external tileset.
   Parser? getCachedSource();
 
   /// Parses a file returning a [TsxProvider].

packages/tiled/test/map_test.dart

@@ -125,14 +125,14 @@ void main() {
 
     test('errors if tile phrase is not in the correct format', () {
       expect(
-        () => map.tileByPhrase('Nonexistant Tile'),
+        () => map.tileByPhrase('Nonexistent Tile'),
         throwsArgumentError,
       );
     });
 
     test('errors if tileset is not present', () {
       expect(
-        () => map.tileByPhrase('Nonexistant Tile|0'),
+        () => map.tileByPhrase('Nonexistent Tile|0'),
         throwsArgumentError,
       );
     });