original file
-----------------------------------
const trim = module.exports = str => trim.trailing(trim.leading(str));

const trim = module.exports = function(str) {
    return  trim.trailing(trim.leading(str));
}
-----------------------------------

Grammar: TypeScript.tmLanguage
-----------------------------------
>const trim = module.exports = str => trim.trailing(trim.leading(str));
 ^^^^^
 source.ts meta.var.expr.ts storage.type.ts
      ^
      source.ts meta.var.expr.ts
       ^^^^
       source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.definition.variable.ts variable.other.constant.ts
           ^
           source.ts meta.var.expr.ts meta.var-single-variable.expr.ts
            ^
            source.ts meta.var.expr.ts keyword.operator.assignment.ts
             ^
             source.ts meta.var.expr.ts
              ^^^^^^
              source.ts meta.var.expr.ts support.type.object.module.ts
                    ^
                    source.ts meta.var.expr.ts punctuation.accessor.ts
                     ^^^^^^^
                     source.ts meta.var.expr.ts support.type.object.module.ts
                            ^
                            source.ts meta.var.expr.ts
                             ^
                             source.ts meta.var.expr.ts keyword.operator.assignment.ts
                              ^
                              source.ts meta.var.expr.ts
                               ^^^
                               source.ts meta.var.expr.ts meta.arrow.ts variable.parameter.ts
                                  ^
                                  source.ts meta.var.expr.ts meta.arrow.ts
                                   ^^
                                   source.ts meta.var.expr.ts meta.arrow.ts storage.type.function.arrow.ts
                                     ^
                                     source.ts meta.var.expr.ts meta.arrow.ts
                                      ^^^^
                                      source.ts meta.var.expr.ts meta.function-call.ts variable.other.object.ts
                                          ^
                                          source.ts meta.var.expr.ts meta.function-call.ts punctuation.accessor.ts
                                           ^^^^^^^^
                                           source.ts meta.var.expr.ts meta.function-call.ts entity.name.function.ts
                                                   ^
                                                   source.ts meta.var.expr.ts meta.brace.round.ts
                                                    ^^^^
                                                    source.ts meta.var.expr.ts meta.function-call.ts variable.other.object.ts
                                                        ^
                                                        source.ts meta.var.expr.ts meta.function-call.ts punctuation.accessor.ts
                                                         ^^^^^^^
                                                         source.ts meta.var.expr.ts meta.function-call.ts entity.name.function.ts
                                                                ^
                                                                source.ts meta.var.expr.ts meta.brace.round.ts
                                                                 ^^^
                                                                 source.ts meta.var.expr.ts variable.other.readwrite.ts
                                                                    ^
                                                                    source.ts meta.var.expr.ts meta.brace.round.ts
                                                                     ^
                                                                     source.ts meta.var.expr.ts meta.brace.round.ts
                                                                      ^
                                                                      source.ts punctuation.terminator.statement.ts
>
 ^
 source.ts
>const trim = module.exports = function(str) {
 ^^^^^
 source.ts meta.var.expr.ts storage.type.ts
      ^
      source.ts meta.var.expr.ts
       ^^^^
       source.ts meta.var.expr.ts meta.var-single-variable.expr.ts meta.definition.variable.ts variable.other.constant.ts
           ^
           source.ts meta.var.expr.ts meta.var-single-variable.expr.ts
            ^
            source.ts meta.var.expr.ts keyword.operator.assignment.ts
             ^
             source.ts meta.var.expr.ts
              ^^^^^^
              source.ts meta.var.expr.ts support.type.object.module.ts
                    ^
                    source.ts meta.var.expr.ts punctuation.accessor.ts
                     ^^^^^^^
                     source.ts meta.var.expr.ts support.type.object.module.ts
                            ^
                            source.ts meta.var.expr.ts
                             ^
                             source.ts meta.var.expr.ts keyword.operator.assignment.ts
                              ^
                              source.ts meta.var.expr.ts
                               ^^^^^^^^
                               source.ts meta.var.expr.ts meta.function.expression.ts storage.type.function.ts
                                       ^
                                       source.ts meta.var.expr.ts meta.function.expression.ts meta.parameters.ts punctuation.definition.parameters.begin.ts
                                        ^^^
                                        source.ts meta.var.expr.ts meta.function.expression.ts meta.parameters.ts variable.parameter.ts
                                           ^
                                           source.ts meta.var.expr.ts meta.function.expression.ts meta.parameters.ts punctuation.definition.parameters.end.ts
                                            ^
                                            source.ts meta.var.expr.ts meta.function.expression.ts
                                             ^
                                             source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts punctuation.definition.block.ts
>    return  trim.trailing(trim.leading(str));
 ^^^^
 source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts
     ^^^^^^
     source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts keyword.control.flow.ts
           ^^
           source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts
             ^^^^
             source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.function-call.ts variable.other.object.ts
                 ^
                 source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.function-call.ts punctuation.accessor.ts
                  ^^^^^^^^
                  source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.function-call.ts entity.name.function.ts
                          ^
                          source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.brace.round.ts
                           ^^^^
                           source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.function-call.ts variable.other.object.ts
                               ^
                               source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.function-call.ts punctuation.accessor.ts
                                ^^^^^^^
                                source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.function-call.ts entity.name.function.ts
                                       ^
                                       source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.brace.round.ts
                                        ^^^
                                        source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts variable.other.readwrite.ts
                                           ^
                                           source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.brace.round.ts
                                            ^
                                            source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts meta.brace.round.ts
                                             ^
                                             source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts punctuation.terminator.statement.ts
>}
 ^
 source.ts meta.var.expr.ts meta.function.expression.ts meta.block.ts punctuation.definition.block.ts