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drwxr-xr-x
accessor-pairs.js
10.95
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array-bracket-newline.js
7.93
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array-bracket-spacing.js
7.88
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array-callback-return.js
12.6
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array-element-newline.js
8.86
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arrow-body-style.js
10.12
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arrow-parens.js
6.95
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arrow-spacing.js
4.51
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block-scoped-var.js
3.42
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block-spacing.js
5.04
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brace-style.js
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callback-return.js
5.74
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camelcase.js
10.12
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capitalized-comments.js
9.07
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class-methods-use-this.js
6.24
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comma-dangle.js
11.38
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comma-spacing.js
5.75
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comma-style.js
10
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complexity.js
4.89
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computed-property-spacing.js
6.55
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consistent-return.js
5.6
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consistent-this.js
4.33
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constructor-super.js
11.77
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curly.js
11.48
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default-case-last.js
1.08
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default-case.js
2.26
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default-param-last.js
1.65
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dot-location.js
3.32
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dot-notation.js
5.08
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eol-last.js
3.48
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eqeqeq.js
4.76
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for-direction.js
4.11
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func-call-spacing.js
8.1
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func-name-matching.js
8.63
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func-names.js
5.01
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func-style.js
5.21
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function-call-argument-newline...
4.12
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function-paren-newline.js
9.96
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generator-star-spacing.js
6.17
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getter-return.js
5.62
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global-require.js
2.78
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grouped-accessor-pairs.js
7.08
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guard-for-in.js
1.88
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handle-callback-err.js
3.17
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id-blacklist.js
6.54
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id-denylist.js
6.21
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id-length.js
5.48
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id-match.js
8.99
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implicit-arrow-linebreak.js
3.07
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indent-legacy.js
34.88
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indent.js
64.92
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index.js
17.43
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init-declarations.js
3.88
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jsx-quotes.js
3.07
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key-spacing.js
20.77
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keyword-spacing.js
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line-comment-position.js
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linebreak-style.js
3.49
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lines-around-comment.js
15.13
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lines-around-directive.js
6.85
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lines-between-class-members.js
9.89
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logical-assignment-operators.j...
18.6
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max-classes-per-file.js
1.81
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max-depth.js
3.55
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max-len.js
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max-lines-per-function.js
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max-lines.js
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max-nested-callbacks.js
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max-params.js
3
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max-statements-per-line.js
6.58
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max-statements.js
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multiline-comment-style.js
17.96
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multiline-ternary.js
6.39
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new-cap.js
7.04
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new-parens.js
3.09
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newline-after-var.js
8.64
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newline-before-return.js
6.96
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newline-per-chained-call.js
3.79
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no-alert.js
3.75
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no-array-constructor.js
4.88
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no-async-promise-executor.js
1007
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no-await-in-loop.js
2.44
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no-bitwise.js
2.88
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no-buffer-constructor.js
1.82
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no-caller.js
1.06
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no-case-declarations.js
1.82
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no-catch-shadow.js
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no-class-assign.js
1.53
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no-compare-neg-zero.js
1.62
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no-cond-assign.js
4.72
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no-confusing-arrow.js
3.16
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no-console.js
6.09
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no-const-assign.js
1.8
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no-constant-binary-expression....
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no-constant-condition.js
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no-constructor-return.js
1.16
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no-continue.js
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no-control-regex.js
3.74
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no-debugger.js
793
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no-delete-var.js
852
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no-div-regex.js
1.22
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no-dupe-args.js
1.95
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no-dupe-class-members.js
2.82
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no-dupe-else-if.js
4.1
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no-dupe-keys.js
3.87
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no-duplicate-case.js
1.72
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no-duplicate-imports.js
9.79
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no-else-return.js
13.09
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no-empty-character-class.js
1.89
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no-empty-function.js
5.22
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no-empty-pattern.js
1.8
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no-empty-static-block.js
1007
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no-empty.js
2.39
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no-eq-null.js
1.09
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no-eval.js
7.34
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no-ex-assign.js
1.27
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no-extend-native.js
5.29
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no-extra-bind.js
5.87
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no-extra-boolean-cast.js
10.34
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no-extra-label.js
4.17
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no-extra-parens.js
42.57
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no-extra-semi.js
4.52
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no-fallthrough.js
6.8
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no-floating-decimal.js
2.51
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no-func-assign.js
1.82
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no-global-assign.js
2.37
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no-implicit-coercion.js
12.3
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no-implicit-globals.js
4.52
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no-implied-eval.js
4.24
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no-import-assign.js
6.03
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no-inline-comments.js
2.63
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no-inner-declarations.js
3.15
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no-invalid-regexp.js
5.82
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no-invalid-this.js
4.38
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no-irregular-whitespace.js
7.67
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no-iterator.js
1.08
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no-label-var.js
2.01
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no-labels.js
3.29
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no-lone-blocks.js
3.24
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no-lonely-if.js
3.23
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no-loop-func.js
6.87
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no-loss-of-precision.js
6.91
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no-magic-numbers.js
10.33
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no-misleading-character-class....
15.96
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no-mixed-operators.js
6.98
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no-mixed-requires.js
6.23
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no-mixed-spaces-and-tabs.js
3.3
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no-multi-assign.js
1.3
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no-multi-spaces.js
4.48
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no-multi-str.js
1.57
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no-multiple-empty-lines.js
5.45
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no-native-reassign.js
2.7
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no-negated-condition.js
2.37
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no-negated-in-lhs.js
1.3
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no-nested-ternary.js
960
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no-new-func.js
2.34
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no-new-native-nonconstructor.j...
1.71
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no-new-object.js
1.82
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no-new-require.js
1.55
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no-new-symbol.js
1.69
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no-new-wrappers.js
1.43
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no-new.js
905
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no-nonoctal-decimal-escape.js
4.46
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no-obj-calls.js
2.41
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no-object-constructor.js
2.85
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no-octal-escape.js
1.15
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no-octal.js
851
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no-param-reassign.js
6.21
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no-path-concat.js
1.96
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no-plusplus.js
2.61
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no-process-env.js
1.6
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no-process-exit.js
1.69
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no-promise-executor-return.js
6.52
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no-proto.js
1.07
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no-prototype-builtins.js
4.61
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no-redeclare.js
4.32
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no-regex-spaces.js
5.15
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no-restricted-exports.js
5.5
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no-restricted-globals.js
3.72
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no-restricted-imports.js
19.02
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no-restricted-modules.js
5.98
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no-restricted-properties.js
5.81
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no-restricted-syntax.js
1.66
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no-return-assign.js
2.21
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no-return-await.js
4.35
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no-script-url.js
1.48
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no-self-assign.js
4.56
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no-self-compare.js
1.67
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no-sequences.js
3.92
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no-setter-return.js
5.59
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no-shadow-restricted-names.js
2.61
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no-shadow.js
16.95
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no-spaced-func.js
2.54
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no-sparse-arrays.js
1.45
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no-sync.js
1.84
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no-tabs.js
2.39
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no-template-curly-in-string.js
989
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no-ternary.js
785
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no-this-before-super.js
8.83
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no-throw-literal.js
1.06
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no-trailing-spaces.js
5.91
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no-unassigned-vars.js
1.92
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no-undef-init.js
2.35
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no-undef.js
1.85
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no-undefined.js
1.82
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no-underscore-dangle.js
9.31
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no-unexpected-multiline.js
3.4
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no-unmodified-loop-condition.j...
9.8
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no-unneeded-ternary.js
5.8
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no-unreachable-loop.js
4.96
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no-unreachable.js
7.32
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no-unsafe-finally.js
3.26
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no-unsafe-negation.js
3.88
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no-unsafe-optional-chaining.js
5.26
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no-unused-expressions.js
5.39
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no-unused-labels.js
3.79
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no-unused-private-class-member...
6.13
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no-unused-vars.js
47.41
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no-use-before-define.js
11.59
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no-useless-assignment.js
18.88
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no-useless-backreference.js
7.48
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no-useless-call.js
2.71
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no-useless-catch.js
1.28
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no-useless-computed-key.js
5.8
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no-useless-concat.js
2.9
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no-useless-constructor.js
6.82
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no-useless-escape.js
10.81
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no-useless-rename.js
4.81
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no-useless-return.js
11.67
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no-var.js
11.19
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no-void.js
1.33
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no-warning-comments.js
5.54
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no-whitespace-before-property....
3.79
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no-with.js
757
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nonblock-statement-body-positi...
4.31
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object-curly-newline.js
9.88
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object-curly-spacing.js
10.16
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object-property-newline.js
3.67
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object-shorthand.js
17.59
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one-var-declaration-per-line.j...
2.92
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one-var.js
17.5
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operator-assignment.js
7.36
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operator-linebreak.js
8.69
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padded-blocks.js
8.7
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padding-line-between-statement...
16.59
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prefer-arrow-callback.js
11.39
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prefer-const.js
15.41
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prefer-destructuring.js
8.72
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prefer-exponentiation-operator...
6.57
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prefer-named-capture-group.js
4.93
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prefer-numeric-literals.js
4.4
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prefer-object-has-own.js
3.71
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prefer-object-spread.js
9.27
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prefer-promise-reject-errors.j...
4.51
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prefer-reflect.js
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prefer-regex-literals.js
14.05
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prefer-rest-params.js
2.96
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prefer-spread.js
2.5
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prefer-template.js
10.29
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quote-props.js
9.89
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quotes.js
10.68
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radix.js
5.42
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require-atomic-updates.js
9.08
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require-await.js
4.46
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require-unicode-regexp.js
7.57
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require-yield.js
1.68
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rest-spread-spacing.js
3.65
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semi-spacing.js
7.21
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semi-style.js
5.12
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semi.js
13.01
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sort-imports.js
8.4
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sort-keys.js
5.74
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sort-vars.js
3.24
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space-before-blocks.js
6.18
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space-before-function-paren.js
5.13
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space-in-parens.js
9.1
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space-infix-ops.js
5.75
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space-unary-ops.js
10.39
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spaced-comment.js
10.98
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strict.js
8.91
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switch-colon-spacing.js
4.59
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symbol-description.js
1.66
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template-curly-spacing.js
4.24
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template-tag-spacing.js
2.99
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unicode-bom.js
1.68
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use-isnan.js
6.96
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valid-typeof.js
4.16
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vars-on-top.js
4.2
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wrap-iife.js
6.75
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wrap-regex.js
2.12
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yield-star-spacing.js
3.9
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yoda.js
9.48
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-rw-r--r--
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Code Editor : arrow-body-style.js
/** * @fileoverview Rule to require braces in arrow function body. * @author Alberto RodrÃguez */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "suggestion", defaultOptions: ["as-needed"], docs: { description: "Require braces around arrow function bodies", recommended: false, frozen: true, url: "https://eslint.org/docs/latest/rules/arrow-body-style", }, schema: { anyOf: [ { type: "array", items: [ { enum: ["always", "never"], }, ], minItems: 0, maxItems: 1, }, { type: "array", items: [ { enum: ["as-needed"], }, { type: "object", properties: { requireReturnForObjectLiteral: { type: "boolean", }, }, additionalProperties: false, }, ], minItems: 0, maxItems: 2, }, ], }, fixable: "code", messages: { unexpectedOtherBlock: "Unexpected block statement surrounding arrow body.", unexpectedEmptyBlock: "Unexpected block statement surrounding arrow body; put a value of `undefined` immediately after the `=>`.", unexpectedObjectBlock: "Unexpected block statement surrounding arrow body; parenthesize the returned value and move it immediately after the `=>`.", unexpectedSingleBlock: "Unexpected block statement surrounding arrow body; move the returned value immediately after the `=>`.", expectedBlock: "Expected block statement surrounding arrow body.", }, }, create(context) { const options = context.options; const always = options[0] === "always"; const asNeeded = options[0] === "as-needed"; const never = options[0] === "never"; const requireReturnForObjectLiteral = options[1] && options[1].requireReturnForObjectLiteral; const sourceCode = context.sourceCode; let funcInfo = null; /** * Checks whether the given node has ASI problem or not. * @param {Token} token The token to check. * @returns {boolean} `true` if it changes semantics if `;` or `}` followed by the token are removed. */ function hasASIProblem(token) { return ( token && token.type === "Punctuator" && /^[([/`+-]/u.test(token.value) ); } /** * Gets the closing parenthesis by the given node. * @param {ASTNode} node first node after an opening parenthesis. * @returns {Token} The found closing parenthesis token. */ function findClosingParen(node) { let nodeToCheck = node; while (!astUtils.isParenthesised(sourceCode, nodeToCheck)) { nodeToCheck = nodeToCheck.parent; } return sourceCode.getTokenAfter(nodeToCheck); } /** * Check whether the node is inside of a for loop's init * @param {ASTNode} node node is inside for loop * @returns {boolean} `true` if the node is inside of a for loop, else `false` */ function isInsideForLoopInitializer(node) { if (node && node.parent) { if ( node.parent.type === "ForStatement" && node.parent.init === node ) { return true; } return isInsideForLoopInitializer(node.parent); } return false; } /** * Determines whether a arrow function body needs braces * @param {ASTNode} node The arrow function node. * @returns {void} */ function validate(node) { const arrowBody = node.body; if (arrowBody.type === "BlockStatement") { const blockBody = arrowBody.body; if (blockBody.length !== 1 && !never) { return; } if ( asNeeded && requireReturnForObjectLiteral && blockBody[0].type === "ReturnStatement" && blockBody[0].argument && blockBody[0].argument.type === "ObjectExpression" ) { return; } if ( never || (asNeeded && blockBody[0].type === "ReturnStatement") ) { let messageId; if (blockBody.length === 0) { messageId = "unexpectedEmptyBlock"; } else if ( blockBody.length > 1 || blockBody[0].type !== "ReturnStatement" ) { messageId = "unexpectedOtherBlock"; } else if (blockBody[0].argument === null) { messageId = "unexpectedSingleBlock"; } else if ( astUtils.isOpeningBraceToken( sourceCode.getFirstToken(blockBody[0], { skip: 1 }), ) ) { messageId = "unexpectedObjectBlock"; } else { messageId = "unexpectedSingleBlock"; } context.report({ node, loc: arrowBody.loc, messageId, fix(fixer) { const fixes = []; if ( blockBody.length !== 1 || blockBody[0].type !== "ReturnStatement" || !blockBody[0].argument || hasASIProblem( sourceCode.getTokenAfter(arrowBody), ) ) { return fixes; } const openingBrace = sourceCode.getFirstToken(arrowBody); const closingBrace = sourceCode.getLastToken(arrowBody); const firstValueToken = sourceCode.getFirstToken( blockBody[0], 1, ); const lastValueToken = sourceCode.getLastToken( blockBody[0], ); const commentsExist = sourceCode.commentsExistBetween( openingBrace, firstValueToken, ) || sourceCode.commentsExistBetween( lastValueToken, closingBrace, ); /* * Remove tokens around the return value. * If comments don't exist, remove extra spaces as well. */ if (commentsExist) { fixes.push( fixer.remove(openingBrace), fixer.remove(closingBrace), fixer.remove( sourceCode.getTokenAfter(openingBrace), ), // return keyword ); } else { fixes.push( fixer.removeRange([ openingBrace.range[0], firstValueToken.range[0], ]), fixer.removeRange([ lastValueToken.range[1], closingBrace.range[1], ]), ); } /* * If the first token of the return value is `{` or the return value is a sequence expression, * enclose the return value by parentheses to avoid syntax error. */ if ( astUtils.isOpeningBraceToken(firstValueToken) || blockBody[0].argument.type === "SequenceExpression" || (funcInfo.hasInOperator && isInsideForLoopInitializer(node)) ) { if ( !astUtils.isParenthesised( sourceCode, blockBody[0].argument, ) ) { fixes.push( fixer.insertTextBefore( firstValueToken, "(", ), fixer.insertTextAfter( lastValueToken, ")", ), ); } } /* * If the last token of the return statement is semicolon, remove it. * Non-block arrow body is an expression, not a statement. */ if (astUtils.isSemicolonToken(lastValueToken)) { fixes.push(fixer.remove(lastValueToken)); } return fixes; }, }); } } else { if ( always || (asNeeded && requireReturnForObjectLiteral && arrowBody.type === "ObjectExpression") ) { context.report({ node, loc: arrowBody.loc, messageId: "expectedBlock", fix(fixer) { const fixes = []; const arrowToken = sourceCode.getTokenBefore( arrowBody, astUtils.isArrowToken, ); const [ firstTokenAfterArrow, secondTokenAfterArrow, ] = sourceCode.getTokensAfter(arrowToken, { count: 2, }); const lastToken = sourceCode.getLastToken(node); let parenthesisedObjectLiteral = null; if ( astUtils.isOpeningParenToken( firstTokenAfterArrow, ) && astUtils.isOpeningBraceToken( secondTokenAfterArrow, ) ) { const braceNode = sourceCode.getNodeByRangeIndex( secondTokenAfterArrow.range[0], ); if (braceNode.type === "ObjectExpression") { parenthesisedObjectLiteral = braceNode; } } // If the value is object literal, remove parentheses which were forced by syntax. if (parenthesisedObjectLiteral) { const openingParenToken = firstTokenAfterArrow; const openingBraceToken = secondTokenAfterArrow; if ( astUtils.isTokenOnSameLine( openingParenToken, openingBraceToken, ) ) { fixes.push( fixer.replaceText( openingParenToken, "{return ", ), ); } else { // Avoid ASI fixes.push( fixer.replaceText( openingParenToken, "{", ), fixer.insertTextBefore( openingBraceToken, "return ", ), ); } // Closing paren for the object doesn't have to be lastToken, e.g.: () => ({}).foo() fixes.push( fixer.remove( findClosingParen( parenthesisedObjectLiteral, ), ), ); fixes.push( fixer.insertTextAfter(lastToken, "}"), ); } else { fixes.push( fixer.insertTextBefore( firstTokenAfterArrow, "{return ", ), ); fixes.push( fixer.insertTextAfter(lastToken, "}"), ); } return fixes; }, }); } } } return { "BinaryExpression[operator='in']"() { let info = funcInfo; while (info) { info.hasInOperator = true; info = info.upper; } }, ArrowFunctionExpression() { funcInfo = { upper: funcInfo, hasInOperator: false, }; }, "ArrowFunctionExpression:exit"(node) { validate(node); funcInfo = funcInfo.upper; }, }; }, };
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