original file
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[1, 2, 3].reduce<readonly number[]>((previous) => previous, []);
-----------------------------------

Grammar: TypeScript.tmLanguage
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>[1, 2, 3].reduce<readonly number[]>((previous) => previous, []);
 ^
 source.ts meta.array.literal.ts meta.brace.square.ts
  ^
  source.ts meta.array.literal.ts constant.numeric.decimal.ts
   ^
   source.ts meta.array.literal.ts punctuation.separator.comma.ts
    ^
    source.ts meta.array.literal.ts
     ^
     source.ts meta.array.literal.ts constant.numeric.decimal.ts
      ^
      source.ts meta.array.literal.ts punctuation.separator.comma.ts
       ^
       source.ts meta.array.literal.ts
        ^
        source.ts meta.array.literal.ts constant.numeric.decimal.ts
         ^
         source.ts meta.array.literal.ts meta.brace.square.ts
          ^
          source.ts meta.function-call.ts punctuation.accessor.ts
           ^^^^^^
           source.ts meta.function-call.ts entity.name.function.ts
                 ^
                 source.ts meta.type.parameters.ts punctuation.definition.typeparameters.begin.ts
                  ^^^^^^^^
                  source.ts meta.type.parameters.ts storage.modifier.ts
                          ^
                          source.ts meta.type.parameters.ts
                           ^^^^^^
                           source.ts meta.type.parameters.ts support.type.primitive.ts
                                 ^
                                 source.ts meta.type.parameters.ts meta.type.tuple.ts meta.brace.square.ts
                                  ^
                                  source.ts meta.type.parameters.ts meta.type.tuple.ts meta.brace.square.ts
                                   ^
                                   source.ts meta.type.parameters.ts punctuation.definition.typeparameters.end.ts
                                    ^
                                    source.ts meta.brace.round.ts
                                     ^
                                     source.ts meta.arrow.ts meta.parameters.ts punctuation.definition.parameters.begin.ts
                                      ^^^^^^^^
                                      source.ts meta.arrow.ts meta.parameters.ts variable.parameter.ts
                                              ^
                                              source.ts meta.arrow.ts meta.parameters.ts punctuation.definition.parameters.end.ts
                                               ^
                                               source.ts meta.arrow.ts
                                                ^^
                                                source.ts meta.arrow.ts storage.type.function.arrow.ts
                                                  ^
                                                  source.ts meta.arrow.ts
                                                   ^^^^^^^^
                                                   source.ts variable.other.readwrite.ts
                                                           ^
                                                           source.ts punctuation.separator.comma.ts
                                                            ^
                                                            source.ts meta.array.literal.ts
                                                             ^
                                                             source.ts meta.array.literal.ts meta.brace.square.ts
                                                              ^
                                                              source.ts meta.array.literal.ts meta.brace.square.ts
                                                               ^
                                                               source.ts meta.brace.round.ts
                                                                ^
                                                                source.ts punctuation.terminator.statement.ts