ts_query_ls/docs/alternation.md

Alternations

An alternation is written as a pair of square brackets ([]) containing a list of alternative patterns. This is similar to character classes from regular expressions ([abc] matches either a, b, or c).

For example, this pattern would match a call to either a variable or an object property. In the case of a variable, capture it as @function, and in the case of a property, capture it as @method:

(call_expression
  function: [
    (identifier) @function
    (member_expression
      property: (property_identifier) @method)
  ])

This pattern would match a set of possible keyword tokens, capturing them as @keyword:

[
  "break"
  "delete"
  "else"
  "for"
  "function"
  "if"
  "return"
  "try"
  "while"
] @keyword