original file
-----------------------------------
class A {
  #a =
      /** @param {MouseEvent} arg */
      arg => {
          const someV = 132
          if (true) {
              doSomething()
          }
          while(false) {
              
          }
      }
}
-----------------------------------

Grammar: TypeScript.tmLanguage
-----------------------------------
>class A {
 ^^^^^
 source.ts meta.class.ts storage.type.class.ts
      ^
      source.ts meta.class.ts
       ^
       source.ts meta.class.ts entity.name.type.class.ts
        ^
        source.ts meta.class.ts
         ^
         source.ts meta.class.ts punctuation.definition.block.ts
>  #a =
 ^^
 source.ts meta.class.ts meta.field.declaration.ts
   ^^
   source.ts meta.class.ts meta.field.declaration.ts meta.definition.property.ts variable.object.property.ts
     ^
     source.ts meta.class.ts meta.field.declaration.ts
      ^
      source.ts meta.class.ts meta.field.declaration.ts keyword.operator.assignment.ts
>      /** @param {MouseEvent} arg */
 ^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts
       ^^^
       source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts punctuation.definition.comment.ts
          ^
          source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts
           ^
           source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts storage.type.class.jsdoc punctuation.definition.block.tag.jsdoc
            ^^^^^
            source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts storage.type.class.jsdoc
                 ^
                 source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts
                  ^
                  source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts entity.name.type.instance.jsdoc punctuation.definition.bracket.curly.begin.jsdoc
                   ^^^^^^^^^^
                   source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts entity.name.type.instance.jsdoc
                             ^
                             source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts entity.name.type.instance.jsdoc punctuation.definition.bracket.curly.end.jsdoc
                              ^
                              source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts
                               ^^^
                               source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts variable.other.jsdoc
                                  ^
                                  source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts
                                   ^^
                                   source.ts meta.class.ts meta.field.declaration.ts comment.block.documentation.ts punctuation.definition.comment.ts
>      arg => {
 ^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts
       ^^^
       source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts variable.parameter.ts
          ^
          source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts
           ^^
           source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts storage.type.function.arrow.ts
             ^
             source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts
              ^
              source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts punctuation.definition.block.ts
>          const someV = 132
 ^^^^^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts
           ^^^^^
           source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.var.expr.ts storage.type.ts
                ^
                source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.var.expr.ts
                 ^^^^^
                 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.definition.variable.ts variable.other.constant.ts
                      ^
                      source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.var.expr.ts meta.var-single-variable.expr.ts
                       ^
                       source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.var.expr.ts keyword.operator.assignment.ts
                        ^
                        source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.var.expr.ts
                         ^^^
                         source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.var.expr.ts constant.numeric.decimal.ts
>          if (true) {
 ^^^^^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts
           ^^
           source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts keyword.control.conditional.ts
             ^
             source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts
              ^
              source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.brace.round.ts
               ^^^^
               source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts constant.language.boolean.true.ts
                   ^
                   source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.brace.round.ts
                    ^
                    source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts
                     ^
                     source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts punctuation.definition.block.ts
>              doSomething()
 ^^^^^^^^^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts
               ^^^^^^^^^^^
               source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts meta.function-call.ts entity.name.function.ts
                          ^
                          source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts meta.brace.round.ts
                           ^
                           source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts meta.brace.round.ts
>          }
 ^^^^^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts
           ^
           source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts punctuation.definition.block.ts
>          while(false) {
 ^^^^^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts
           ^^^^^
           source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts keyword.control.loop.ts
                ^
                source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.brace.round.ts
                 ^^^^^
                 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts constant.language.boolean.false.ts
                      ^
                      source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.brace.round.ts
                       ^
                       source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts
                        ^
                        source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts punctuation.definition.block.ts
>              
 ^^^^^^^^^^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts
>          }
 ^^^^^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts
           ^
           source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts meta.block.ts punctuation.definition.block.ts
>      }
 ^^^^^^
 source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts
       ^
       source.ts meta.class.ts meta.field.declaration.ts meta.arrow.ts meta.block.ts punctuation.definition.block.ts
>}
 ^
 source.ts meta.class.ts punctuation.definition.block.ts