biome_js_parser 0.5.7

Biome's JavaScript parser
Documentation 
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JsRoot {
    interpreter_token: missing (optional),
    directives: [],
    statements: [
        JsSwitchStatement {
            switch_token: SWITCH_KW@0..7 "switch" [] [Whitespace(" ")],
            l_paren_token: L_PAREN@7..8 "(" [] [],
            discriminant: JsReferenceIdentifierExpression {
                name_token: IDENT@8..11 "foo" [] [],
            },
            r_paren_token: R_PAREN@11..13 ")" [] [Whitespace(" ")],
            l_curly_token: L_CURLY@13..14 "{" [] [],
            cases: [
                JsDefaultClause {
                    default_token: DEFAULT_KW@14..23 "default" [Whitespace("\n\t")] [],
                    colon_token: COLON@23..25 ":" [] [Whitespace(" ")],
                    consequent: [
                        JsBlockStatement {
                            l_curly_token: L_CURLY@25..26 "{" [] [],
                            statements: [],
                            r_curly_token: R_CURLY@26..27 "}" [] [],
                        },
                    ],
                },
                JsDefaultClause {
                    default_token: DEFAULT_KW@27..36 "default" [Whitespace("\n\t")] [],
                    colon_token: COLON@36..38 ":" [] [Whitespace(" ")],
                    consequent: [
                        JsBlockStatement {
                            l_curly_token: L_CURLY@38..39 "{" [] [],
                            statements: [],
                            r_curly_token: R_CURLY@39..40 "}" [] [],
                        },
                    ],
                },
            ],
            r_curly_token: R_CURLY@40..42 "}" [Whitespace("\n")] [],
        },
    ],
}

0: JS_ROOT@0..43
  0: (empty)
  1: LIST@0..0
  2: LIST@0..42
    0: JS_SWITCH_STATEMENT@0..42
      0: SWITCH_KW@0..7 "switch" [] [Whitespace(" ")]
      1: L_PAREN@7..8 "(" [] []
      2: JS_REFERENCE_IDENTIFIER_EXPRESSION@8..11
        0: IDENT@8..11 "foo" [] []
      3: R_PAREN@11..13 ")" [] [Whitespace(" ")]
      4: L_CURLY@13..14 "{" [] []
      5: LIST@14..40
        0: JS_DEFAULT_CLAUSE@14..27
          0: DEFAULT_KW@14..23 "default" [Whitespace("\n\t")] []
          1: COLON@23..25 ":" [] [Whitespace(" ")]
          2: LIST@25..27
            0: JS_BLOCK_STATEMENT@25..27
              0: L_CURLY@25..26 "{" [] []
              1: LIST@26..26
              2: R_CURLY@26..27 "}" [] []
        1: JS_DEFAULT_CLAUSE@27..40
          0: DEFAULT_KW@27..36 "default" [Whitespace("\n\t")] []
          1: COLON@36..38 ":" [] [Whitespace(" ")]
          2: LIST@38..40
            0: JS_BLOCK_STATEMENT@38..40
              0: L_CURLY@38..39 "{" [] []
              1: LIST@39..39
              2: R_CURLY@39..40 "}" [] []
      6: R_CURLY@40..42 "}" [Whitespace("\n")] []
  3: EOF@42..43 "" [Whitespace("\n")] []
--
error[SyntaxError]: Multiple default clauses inside of a switch statement are not allowed
  ┌─ switch_stmt_double_default.js:3:2
  │
2 │     default: {}
  │     ---------- the first default clause is defined here
3 │     default: {}
  │     ^^^^^^^^^^ a second clause here is not allowed

--
switch (foo) {
	default: {}
	default: {}
}