)

## What

Follow-up to #23056. Replace the parser-level `lookahead` (checkpoint + bump + rewind) in the TS `asserts` type-predicate path with a single cached lexer-level `peek_token()`.

The check only inspects the one token after `asserts`:

```rust
// before
if self.lookahead(|parser| {
    parser.bump(Kind::Asserts);
    parser.is_token_identifier_or_keyword_on_same_line()
}) { ... }

// after
let next = self.lexer.peek_token();
if next.kind().is_identifier_name() && !next.is_on_new_line() { ... }
```

The now-unused `is_token_identifier_or_keyword_on_same_line` helper is removed.

## Why

`peek_token()` is a cached lexer-level re-lex, far cheaper than a parser-level `checkpoint` (which snapshots lexer state, the current token, the error position and the fatal-error slot). Same single-token migration as the four paths in #23056.

## Conformance

No AST change — estree (full AST + spans + token streams) byte-identical to `main`.

### 💥 BREAKING CHANGES

- ee4dc73 ast: [**BREAKING**] Add `#[non_exhaustive]` to AST nodes
(#23046) (overlookmotel)
- 4c35362 ast: [**BREAKING**] Add
`AstBuilder::template_element_escape_raw` and
`template_element_escape_raw_with_lone_surrogates` methods (#23047)
(overlookmotel)

### 🚀 Features

- b846ab2 react_compiler: Integrate the Rust port of the React Compiler
(#22942) (Boshen)
- 5b8dd68 parser: Report TS1255 for invalid class definite assertions
(#22917) (camc314)
- 85efabf semantic: Make building the class table optional, off by
default (#22862) (Boshen)

### 🐛 Bug Fixes

- 556acdc codegen: Parenthesize TS-cast assignment targets (#23112)
(Boshen)
- 37169ff codegen: Don't emit space between postfix `--` and `>` when
minifying (#23036) (Boshen)
- a4b1bf7 codegen: Drop redundant whitespace in minified TypeScript
output (#23038) (Boshen)
- cf53285 parser: Report reserved type-declaration names in the parser
(#23035) (Boshen)
- 4e44969 ast: Fix UB in `escape_template_element_raw` (#23052)
(overlookmotel)
- c543154 parser: Report comma operator in JSX expression in the parser
(#23030) (Boshen)
- 325c94f codegen: Tighten conditional-type and constructor-type
whitespace when minifying (#23033) (Boshen)
- 95dd3a2 parser: Report `import type` alias to a non-external reference
in the parser (#23032) (Boshen)
- 90180b8 codegen: Drop space after `:` in function return type when
minifying (#23028) (Boshen)
- 6da876e parser: Report `abstract` private class field in the parser
(#23029) (Boshen)
- 28467ce codegen: Don't emit space before a postfix update operand when
minifying (#23027) (Boshen)
- cb29926 codegen: Drop redundant space after `export default` when
minifying (#23024) (Boshen)
- 62965ae codegen: Drop redundant space after `else` when minifying
(#23025) (Boshen)
- 989230a parser: Report compound assignment to non-simple target in the
parser (#23022) (Boshen)
- 06f367c parser: Report `super.#field` private access in the parser
(#23014) (Boshen)
- 184edef codegen: Print space before `const`/`declare` enum modifier
(#23013) (Boshen)
- 4d722e0 parser: Report duplicate switch `default` clause in the parser
(#23012) (Boshen)
- 597ed85 codegen: Parenthesize `let`/`async` for-of head target
(#23008) (Boshen)
- 8b631bf codegen: Remove stray space before mapped type value colon
(#23010) (Boshen)
- c08407e codegen: Don't over-parenthesize `in` inside an arrow in a
for-init (#23009) (Boshen)
- 600cd6f codegen: Parenthesize lower-precedence
`TSInstantiationExpression` operand (#23007) (Boshen)
- 187e1a5 codegen: Don't leak space after comment-only JSX expression
container (#23006) (Boshen)
- 294c473 codegen: Don't over-parenthesize `TSTypeAssertion` operand
(#23004) (Boshen)
- 786d96f codegen: Give `TSTypeAssertion` unary precedence (#23002)
(Boshen)
- 1295882 parser: Report `new.target` and `import.meta` syntax errors in
the parser (#23003) (Boshen)
- d727b6b codegen: Parenthesize `await` expression as base of `**`
(#23001) (Boshen)
- 67dfa08 codegen: Keep parentheses around `new` callees containing a
call (#22997) (Boshen)
- 17e7cf3 parser: Disallow unerasable `as`/`satisfies` assertions
(#22986) (Boshen)
- beb46d3 parser: Commit to module goal on decorated exports (#22941)
(Boshen)
- 49e63f7 isolated-declarations: Require annotations for satisfies
initializers (#22898) (camc314)
- 8c93601 isolated-declarations: Allow unknown enum initializer in
non-const enum (#22900) (camc314)

### ⚡ Performance

- 7d89909 parser: Peek instead of lookahead for yield disambiguation
(#23071) (Boshen)
- bf872f0 parser: Skip arrow lookahead for a parenthesized literal
(#23070) (Boshen)
- d19fc54 parser: Guard type-argument speculation behind an angle-token
check (#23069) (Boshen)
- 8eb5507 parser: Skip redundant member-rest re-scan on call entry
(#23068) (Boshen)
- 883dfc1 parser: Skip parse_call_expression_rest when no call follows
(#23063) (Boshen)
- b171153 parser: Peek before the await-using lookahead (#23059)
(Boshen)
- 56f21bd parser: Use peek_token for the TS `asserts` type predicate
(#23058) (Boshen)
- 68805ac parser: Use peek_token instead of checkpoint/rewind for
single-token decisions (#23056) (Boshen)
- 1f9d8eb ast: `AstBuilder::template_element_escape_raw` avoid
allocation if no escape required (#23053) (overlookmotel)
- 502b04d semantic: Move cold function redeclaration handling into
`#[cold]` function (#22973) (overlookmotel)

### 📚 Documentation

- 275d318 napi/minifier: Point `target` to oxc docs (#23102) (camc314)

Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>