biome_js_parser 0.5.7

Biome's JavaScript parser
Documentation
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JsModule {
    bom_token: missing (optional),
    interpreter_token: missing (optional),
    directives: JsDirectiveList [],
    items: JsModuleItemList [
        JsVariableStatement {
            declaration: JsVariableDeclaration {
                await_token: missing (optional),
                kind: LET_KW@0..4 "let" [] [Whitespace(" ")],
                declarators: JsVariableDeclaratorList [
                    JsVariableDeclarator {
                        id: JsArrayBindingPattern {
                            l_brack_token: L_BRACK@4..5 "[" [] [],
                            elements: JsArrayBindingPatternElementList [
                                JsArrayBindingPatternElement {
                                    pattern: JsIdentifierBinding {
                                        name_token: IDENT@5..7 "a" [] [Whitespace(" ")],
                                    },
                                    init: missing (optional),
                                },
                                missing separator,
                                JsArrayBindingPatternElement {
                                    pattern: JsIdentifierBinding {
                                        name_token: IDENT@7..8 "b" [] [],
                                    },
                                    init: missing (optional),
                                },
                            ],
                            r_brack_token: R_BRACK@8..10 "]" [] [Whitespace(" ")],
                        },
                        variable_annotation: missing (optional),
                        initializer: JsInitializerClause {
                            eq_token: EQ@10..12 "=" [] [Whitespace(" ")],
                            expression: JsArrayExpression {
                                l_brack_token: L_BRACK@12..13 "[" [] [],
                                elements: JsArrayElementList [
                                    JsNumberLiteralExpression {
                                        value_token: JS_NUMBER_LITERAL@13..14 "1" [] [],
                                    },
                                    COMMA@14..16 "," [] [Whitespace(" ")],
                                    JsNumberLiteralExpression {
                                        value_token: JS_NUMBER_LITERAL@16..17 "2" [] [],
                                    },
                                ],
                                r_brack_token: R_BRACK@17..18 "]" [] [],
                            },
                        },
                    },
                ],
            },
            semicolon_token: SEMICOLON@18..19 ";" [] [],
        },
        JsVariableStatement {
            declaration: JsVariableDeclaration {
                await_token: missing (optional),
                kind: LET_KW@19..24 "let" [Newline("\n")] [Whitespace(" ")],
                declarators: JsVariableDeclaratorList [
                    JsVariableDeclarator {
                        id: JsArrayBindingPattern {
                            l_brack_token: L_BRACK@24..25 "[" [] [],
                            elements: JsArrayBindingPatternElementList [],
                            r_brack_token: missing (required),
                        },
                        variable_annotation: missing (optional),
                        initializer: JsInitializerClause {
                            eq_token: EQ@25..26 "=" [] [],
                            expression: JsStringLiteralExpression {
                                value_token: JS_STRING_LITERAL@26..35 "\"default\"" [] [],
                            },
                        },
                    },
                ],
            },
            semicolon_token: missing (optional),
        },
        JsBogusStatement {
            items: [
                R_BRACK@35..37 "]" [] [Whitespace(" ")],
                EQ@37..39 "=" [] [Whitespace(" ")],
                L_BRACK@39..40 "[" [] [],
                JS_NUMBER_LITERAL@40..41 "1" [] [],
                COMMA@41..43 "," [] [Whitespace(" ")],
                JS_NUMBER_LITERAL@43..44 "2" [] [],
                R_BRACK@44..45 "]" [] [],
            ],
        },
        JsEmptyStatement {
            semicolon_token: SEMICOLON@45..46 ";" [] [],
        },
        JsBogusStatement {
            items: [
                JsBogus {
                    items: [
                        LET_KW@46..51 "let" [Newline("\n")] [Whitespace(" ")],
                        JsBogus {
                            items: [
                                JsBogus {
                                    items: [
                                        JsBogus {
                                            items: [
                                                L_BRACK@51..52 "[" [] [],
                                                JsBogus {
                                                    items: [
                                                        JsBogusBinding {
                                                            items: [
                                                                JS_STRING_LITERAL@52..61 "\"default\"" [] [],
                                                            ],
                                                        },
                                                    ],
                                                },
                                                R_BRACK@61..63 "]" [] [Whitespace(" ")],
                                            ],
                                        },
                                        JsInitializerClause {
                                            eq_token: EQ@63..65 "=" [] [Whitespace(" ")],
                                            expression: JsArrayExpression {
                                                l_brack_token: L_BRACK@65..66 "[" [] [],
                                                elements: JsArrayElementList [
                                                    JsNumberLiteralExpression {
                                                        value_token: JS_NUMBER_LITERAL@66..67 "1" [] [],
                                                    },
                                                    COMMA@67..69 "," [] [Whitespace(" ")],
                                                    JsNumberLiteralExpression {
                                                        value_token: JS_NUMBER_LITERAL@69..70 "2" [] [],
                                                    },
                                                ],
                                                r_brack_token: R_BRACK@70..71 "]" [] [],
                                            },
                                        },
                                    ],
                                },
                            ],
                        },
                    ],
                },
                SEMICOLON@71..72 ";" [] [],
            ],
        },
        JsVariableStatement {
            declaration: JsVariableDeclaration {
                await_token: missing (optional),
                kind: LET_KW@72..77 "let" [Newline("\n")] [Whitespace(" ")],
                declarators: JsVariableDeclaratorList [
                    JsVariableDeclarator {
                        id: JsArrayBindingPattern {
                            l_brack_token: L_BRACK@77..78 "[" [] [],
                            elements: JsArrayBindingPatternElementList [
                                JsArrayBindingPatternElement {
                                    pattern: JsArrayBindingPattern {
                                        l_brack_token: L_BRACK@78..79 "[" [] [],
                                        elements: JsArrayBindingPatternElementList [
                                            JsArrayBindingPatternElement {
                                                pattern: JsIdentifierBinding {
                                                    name_token: IDENT@79..81 "c" [] [Whitespace(" ")],
                                                },
                                                init: missing (optional),
                                            },
                                        ],
                                        r_brack_token: R_BRACK@81..83 "]" [] [Whitespace(" ")],
                                    },
                                    init: JsInitializerClause {
                                        eq_token: EQ@83..85 "=" [] [Whitespace(" ")],
                                        expression: JsArrayExpression {
                                            l_brack_token: L_BRACK@85..86 "[" [] [],
                                            elements: JsArrayElementList [],
                                            r_brack_token: R_BRACK@86..87 "]" [] [],
                                        },
                                    },
                                },
                            ],
                            r_brack_token: missing (required),
                        },
                        variable_annotation: missing (optional),
                        initializer: missing (optional),
                    },
                ],
            },
            semicolon_token: SEMICOLON@87..88 ";" [] [],
        },
    ],
    eof_token: EOF@88..89 "" [Newline("\n")] [],
}

0: JS_MODULE@0..89
  0: (empty)
  1: (empty)
  2: JS_DIRECTIVE_LIST@0..0
  3: JS_MODULE_ITEM_LIST@0..88
    0: JS_VARIABLE_STATEMENT@0..19
      0: JS_VARIABLE_DECLARATION@0..18
        0: (empty)
        1: LET_KW@0..4 "let" [] [Whitespace(" ")]
        2: JS_VARIABLE_DECLARATOR_LIST@4..18
          0: JS_VARIABLE_DECLARATOR@4..18
            0: JS_ARRAY_BINDING_PATTERN@4..10
              0: L_BRACK@4..5 "[" [] []
              1: JS_ARRAY_BINDING_PATTERN_ELEMENT_LIST@5..8
                0: JS_ARRAY_BINDING_PATTERN_ELEMENT@5..7
                  0: JS_IDENTIFIER_BINDING@5..7
                    0: IDENT@5..7 "a" [] [Whitespace(" ")]
                  1: (empty)
                1: (empty)
                2: JS_ARRAY_BINDING_PATTERN_ELEMENT@7..8
                  0: JS_IDENTIFIER_BINDING@7..8
                    0: IDENT@7..8 "b" [] []
                  1: (empty)
              2: R_BRACK@8..10 "]" [] [Whitespace(" ")]
            1: (empty)
            2: JS_INITIALIZER_CLAUSE@10..18
              0: EQ@10..12 "=" [] [Whitespace(" ")]
              1: JS_ARRAY_EXPRESSION@12..18
                0: L_BRACK@12..13 "[" [] []
                1: JS_ARRAY_ELEMENT_LIST@13..17
                  0: JS_NUMBER_LITERAL_EXPRESSION@13..14
                    0: JS_NUMBER_LITERAL@13..14 "1" [] []
                  1: COMMA@14..16 "," [] [Whitespace(" ")]
                  2: JS_NUMBER_LITERAL_EXPRESSION@16..17
                    0: JS_NUMBER_LITERAL@16..17 "2" [] []
                2: R_BRACK@17..18 "]" [] []
      1: SEMICOLON@18..19 ";" [] []
    1: JS_VARIABLE_STATEMENT@19..35
      0: JS_VARIABLE_DECLARATION@19..35
        0: (empty)
        1: LET_KW@19..24 "let" [Newline("\n")] [Whitespace(" ")]
        2: JS_VARIABLE_DECLARATOR_LIST@24..35
          0: JS_VARIABLE_DECLARATOR@24..35
            0: JS_ARRAY_BINDING_PATTERN@24..25
              0: L_BRACK@24..25 "[" [] []
              1: JS_ARRAY_BINDING_PATTERN_ELEMENT_LIST@25..25
              2: (empty)
            1: (empty)
            2: JS_INITIALIZER_CLAUSE@25..35
              0: EQ@25..26 "=" [] []
              1: JS_STRING_LITERAL_EXPRESSION@26..35
                0: JS_STRING_LITERAL@26..35 "\"default\"" [] []
      1: (empty)
    2: JS_BOGUS_STATEMENT@35..45
      0: R_BRACK@35..37 "]" [] [Whitespace(" ")]
      1: EQ@37..39 "=" [] [Whitespace(" ")]
      2: L_BRACK@39..40 "[" [] []
      3: JS_NUMBER_LITERAL@40..41 "1" [] []
      4: COMMA@41..43 "," [] [Whitespace(" ")]
      5: JS_NUMBER_LITERAL@43..44 "2" [] []
      6: R_BRACK@44..45 "]" [] []
    3: JS_EMPTY_STATEMENT@45..46
      0: SEMICOLON@45..46 ";" [] []
    4: JS_BOGUS_STATEMENT@46..72
      0: JS_BOGUS@46..71
        0: LET_KW@46..51 "let" [Newline("\n")] [Whitespace(" ")]
        1: JS_BOGUS@51..71
          0: JS_BOGUS@51..71
            0: JS_BOGUS@51..63
              0: L_BRACK@51..52 "[" [] []
              1: JS_BOGUS@52..61
                0: JS_BOGUS_BINDING@52..61
                  0: JS_STRING_LITERAL@52..61 "\"default\"" [] []
              2: R_BRACK@61..63 "]" [] [Whitespace(" ")]
            1: JS_INITIALIZER_CLAUSE@63..71
              0: EQ@63..65 "=" [] [Whitespace(" ")]
              1: JS_ARRAY_EXPRESSION@65..71
                0: L_BRACK@65..66 "[" [] []
                1: JS_ARRAY_ELEMENT_LIST@66..70
                  0: JS_NUMBER_LITERAL_EXPRESSION@66..67
                    0: JS_NUMBER_LITERAL@66..67 "1" [] []
                  1: COMMA@67..69 "," [] [Whitespace(" ")]
                  2: JS_NUMBER_LITERAL_EXPRESSION@69..70
                    0: JS_NUMBER_LITERAL@69..70 "2" [] []
                2: R_BRACK@70..71 "]" [] []
      1: SEMICOLON@71..72 ";" [] []
    5: JS_VARIABLE_STATEMENT@72..88
      0: JS_VARIABLE_DECLARATION@72..87
        0: (empty)
        1: LET_KW@72..77 "let" [Newline("\n")] [Whitespace(" ")]
        2: JS_VARIABLE_DECLARATOR_LIST@77..87
          0: JS_VARIABLE_DECLARATOR@77..87
            0: JS_ARRAY_BINDING_PATTERN@77..87
              0: L_BRACK@77..78 "[" [] []
              1: JS_ARRAY_BINDING_PATTERN_ELEMENT_LIST@78..87
                0: JS_ARRAY_BINDING_PATTERN_ELEMENT@78..87
                  0: JS_ARRAY_BINDING_PATTERN@78..83
                    0: L_BRACK@78..79 "[" [] []
                    1: JS_ARRAY_BINDING_PATTERN_ELEMENT_LIST@79..81
                      0: JS_ARRAY_BINDING_PATTERN_ELEMENT@79..81
                        0: JS_IDENTIFIER_BINDING@79..81
                          0: IDENT@79..81 "c" [] [Whitespace(" ")]
                        1: (empty)
                    2: R_BRACK@81..83 "]" [] [Whitespace(" ")]
                  1: JS_INITIALIZER_CLAUSE@83..87
                    0: EQ@83..85 "=" [] [Whitespace(" ")]
                    1: JS_ARRAY_EXPRESSION@85..87
                      0: L_BRACK@85..86 "[" [] []
                      1: JS_ARRAY_ELEMENT_LIST@86..86
                      2: R_BRACK@86..87 "]" [] []
              2: (empty)
            1: (empty)
            2: (empty)
      1: SEMICOLON@87..88 ";" [] []
  4: EOF@88..89 "" [Newline("\n")] []
--
array_binding_err.js:1:8 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `,` but instead found `b`
  
  > 1 │ let [a b] = [1, 2];
      │        ^
    2 │ let [="default"] = [1, 2];
    3 │ let ["default"] = [1, 2];
  
  i Remove b
  
--
array_binding_err.js:2:6 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected an identifier, an object pattern, an array pattern, or a rest pattern but instead found '='.
  
    1 │ let [a b] = [1, 2];
  > 2 │ let [="default"] = [1, 2];
      │      ^
    3 │ let ["default"] = [1, 2];
    4 │ let [[c ] = [];
  
  i Expected an identifier, an object pattern, an array pattern, or a rest pattern here.
  
    1 │ let [a b] = [1, 2];
  > 2 │ let [="default"] = [1, 2];
      │      ^
    3 │ let ["default"] = [1, 2];
    4 │ let [[c ] = [];
  
--
array_binding_err.js:2:16 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected a semicolon or an implicit semicolon after a statement, but found none
  
    1 │ let [a b] = [1, 2];
  > 2 │ let [="default"] = [1, 2];
      │                ^
    3 │ let ["default"] = [1, 2];
    4 │ let [[c ] = [];
  
  i An explicit or implicit semicolon is expected here...
  
    1 │ let [a b] = [1, 2];
  > 2 │ let [="default"] = [1, 2];
      │                ^
    3 │ let ["default"] = [1, 2];
    4 │ let [[c ] = [];
  
  i ...Which is required to end this statement
  
    1 │ let [a b] = [1, 2];
  > 2 │ let [="default"] = [1, 2];
      │ ^^^^^^^^^^^^^^^
    3 │ let ["default"] = [1, 2];
    4 │ let [[c ] = [];
  
--
array_binding_err.js:3:6 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Expected an identifier, an object pattern, an array pattern, or a rest pattern but instead found '"default"'.
  
    1 │ let [a b] = [1, 2];
    2 │ let [="default"] = [1, 2];
  > 3 │ let ["default"] = [1, 2];
      │      ^^^^^^^^^
    4 │ let [[c ] = [];
    5 │ 
  
  i Expected an identifier, an object pattern, an array pattern, or a rest pattern here.
  
    1 │ let [a b] = [1, 2];
    2 │ let [="default"] = [1, 2];
  > 3 │ let ["default"] = [1, 2];
      │      ^^^^^^^^^
    4 │ let [[c ] = [];
    5 │ 
  
--
array_binding_err.js:4:15 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × expected `,` but instead found `;`
  
    2 │ let [="default"] = [1, 2];
    3 │ let ["default"] = [1, 2];
  > 4 │ let [[c ] = [];
      │               ^
    5 │ 
  
  i Remove ;
  
--
array_binding_err.js:4:5 parse ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  × Object and Array patterns require initializers.
  
    2 │ let [="default"] = [1, 2];
    3 │ let ["default"] = [1, 2];
  > 4 │ let [[c ] = [];
      │     ^^^^^^^^^^
    5 │ 
  
  i This pattern is declared, but it is not given an initialized value.
  
--
let [a b] = [1, 2];
let [="default"] = [1, 2];
let ["default"] = [1, 2];
let [[c ] = [];