original file
-----------------------------------
function foo(this: number, x: number) {

}
-----------------------------------

Grammar: TypeScript.tmLanguage
-----------------------------------
>function foo(this: number, x: number) {
 ^^^^^^^^
 source.ts meta.function.ts storage.type.function.ts
         ^
         source.ts meta.function.ts
          ^^^
          source.ts meta.function.ts meta.definition.function.ts entity.name.function.ts
             ^
             source.ts meta.function.ts meta.parameters.ts punctuation.definition.parameters.begin.ts
              ^^^^
              source.ts meta.function.ts meta.parameters.ts variable.parameter.ts variable.language.this.ts
                  ^
                  source.ts meta.function.ts meta.parameters.ts meta.type.annotation.ts keyword.operator.type.annotation.ts
                   ^
                   source.ts meta.function.ts meta.parameters.ts meta.type.annotation.ts
                    ^^^^^^
                    source.ts meta.function.ts meta.parameters.ts meta.type.annotation.ts support.type.primitive.ts
                          ^
                          source.ts meta.function.ts meta.parameters.ts punctuation.separator.parameter.ts
                           ^
                           source.ts meta.function.ts meta.parameters.ts
                            ^
                            source.ts meta.function.ts meta.parameters.ts variable.parameter.ts
                             ^
                             source.ts meta.function.ts meta.parameters.ts meta.type.annotation.ts keyword.operator.type.annotation.ts
                              ^
                              source.ts meta.function.ts meta.parameters.ts meta.type.annotation.ts
                               ^^^^^^
                               source.ts meta.function.ts meta.parameters.ts meta.type.annotation.ts support.type.primitive.ts
                                     ^
                                     source.ts meta.function.ts meta.parameters.ts punctuation.definition.parameters.end.ts
                                      ^
                                      source.ts meta.function.ts
                                       ^
                                       source.ts meta.function.ts meta.block.ts punctuation.definition.block.ts
>
 ^
 source.ts meta.function.ts meta.block.ts
>}
 ^
 source.ts meta.function.ts meta.block.ts punctuation.definition.block.ts