Parser fails to astify postgres query containing IS DISTINCT FROM TRUE in WHERE clause

[rileyjbauer]

Describe the bug
As title says, the node-sql-parser fails when trying to astify a postgres query containing IS DISTINCT FROM TRUE in WHERE clause.

Database Engine
PostgreSQL

To Reproduce
Query:
SELECT * FROM my_table a WHERE a.value IS DISTINCT FROM TRUE

node-sql-parser version: 5.4.0

node version: 22.18.0

Expected behavior
astify should succeed; the query is valid, instead the error below is thrown.

Screenshots
Error message and stack trace:

Error running fn s68 [SyntaxError]: Expected [A-Za-z0-9_\-$一-龥À-ſ] but end of input found.
    at Jl2 (/.../dist/index.js)
    at Object.parse [as postgresql] (/.../dist/index.js)
    at r49.value (/.../dist/index.js)
    at r49.value (/.../dist/index.js)
    ... {
  expected: [
    {
      type: 'class',
      parts: [Array],
      inverted: false,
      ignoreCase: false
    }
  ],
  found: null,
  location: {
    start: { offset: 60, line: 1, column: 61 },
    end: { offset: 60, line: 1, column: 61 }
  }
}