nvim-treesitter/queries/typescript/locals.scm

; inherits: ecma

(required_parameter
  (identifier) @local.definition)

(optional_parameter
  (identifier) @local.definition)

; x => x
(arrow_function
  parameter: (identifier) @local.definition.parameter)

; ({ a }) => null
(required_parameter
  (object_pattern
    (shorthand_property_identifier_pattern) @local.definition.parameter))

; ({ a: b }) => null
(required_parameter
  (object_pattern
    (pair_pattern
      value: (identifier) @local.definition.parameter)))

; ([ a ]) => null
(required_parameter
  (array_pattern
    (identifier) @local.definition.parameter))

(required_parameter
  (rest_pattern
    (identifier) @local.definition.parameter))