TypeScript: skip ! when parsing variable statements

[masatake]

Fixes #4384

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.02%. Comparing base (b4fdb90) to head (feb392b).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4389   +/-   ##
=======================================
  Coverage   86.02%   86.02%           
=======================================
  Files         253      253           
  Lines       63506    63506           
=======================================
  Hits        54634    54634           
  Misses       8872     8872           

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[Copilot]

Pull request overview

This PR adds support for TypeScript's non-null assertion operator (!) in the parser, ensuring it is properly skipped and doesn't interfere with parsing variable statements and class properties.

Changes:

• Added TOKEN_BANG to handle the ! operator in TypeScript
• Updated parser logic to skip ! tokens in variable and class body parsing contexts
• Added comprehensive test cases for both definite assignment assertions and non-null assertions

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
parsers/typescript.c	Added TOKEN_BANG token type and updated parsers to handle ! in variable statements and class properties
Units/parser-typescript.r/skip-bang.d/validator	Added validator file specifying TypeScript compiler for test validation
Units/parser-typescript.r/skip-bang.d/input.ts	Added test case for non-null assertion in ternary expression
Units/parser-typescript.r/skip-bang.d/input-0.ts	Added test case for definite assignment assertions on class properties
Units/parser-typescript.r/skip-bang.d/expected.tags	Added expected parser output for the test cases
Units/parser-typescript.r/skip-bang.d/args.ctags	Added test configuration to disable sorting

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