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accessor-pairs.js
11.71
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array-bracket-newline.js
9.45
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array-bracket-spacing.js
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array-callback-return.js
15.5
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array-element-newline.js
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arrow-body-style.js
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arrow-parens.js
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arrow-spacing.js
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block-scoped-var.js
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block-spacing.js
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brace-style.js
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callback-return.js
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camelcase.js
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capitalized-comments.js
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class-methods-use-this.js
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comma-dangle.js
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comma-spacing.js
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comma-style.js
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complexity.js
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computed-property-spacing.js
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consistent-return.js
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consistent-this.js
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curly.js
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default-case-last.js
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default-case.js
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default-param-last.js
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dot-location.js
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dot-notation.js
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eol-last.js
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eqeqeq.js
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for-direction.js
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func-call-spacing.js
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func-name-matching.js
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func-names.js
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func-style.js
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function-paren-newline.js
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generator-star-spacing.js
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getter-return.js
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global-require.js
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grouped-accessor-pairs.js
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guard-for-in.js
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handle-callback-err.js
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id-blacklist.js
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id-denylist.js
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id-length.js
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id-match.js
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implicit-arrow-linebreak.js
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indent-legacy.js
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indent.js
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index.js
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init-declarations.js
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jsx-quotes.js
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key-spacing.js
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keyword-spacing.js
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line-comment-position.js
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linebreak-style.js
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lines-around-comment.js
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lines-around-directive.js
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lines-between-class-members.js
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logical-assignment-operators.j...
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max-classes-per-file.js
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max-depth.js
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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
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max-statements-per-line.js
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max-statements.js
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multiline-comment-style.js
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multiline-ternary.js
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new-cap.js
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new-parens.js
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newline-after-var.js
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newline-before-return.js
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newline-per-chained-call.js
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no-alert.js
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no-array-constructor.js
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no-async-promise-executor.js
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no-await-in-loop.js
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no-bitwise.js
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no-case-declarations.js
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no-catch-shadow.js
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no-class-assign.js
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no-compare-neg-zero.js
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no-cond-assign.js
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no-confusing-arrow.js
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no-console.js
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no-const-assign.js
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no-constant-condition.js
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no-continue.js
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no-control-regex.js
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no-debugger.js
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no-delete-var.js
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no-div-regex.js
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no-dupe-args.js
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no-dupe-class-members.js
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no-dupe-else-if.js
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no-dupe-keys.js
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no-duplicate-case.js
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no-duplicate-imports.js
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no-else-return.js
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no-empty-character-class.js
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no-empty-function.js
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no-empty-pattern.js
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no-empty-static-block.js
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no-empty.js
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no-eq-null.js
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no-eval.js
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no-ex-assign.js
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no-extend-native.js
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no-extra-bind.js
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no-extra-boolean-cast.js
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no-extra-label.js
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no-extra-parens.js
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no-extra-semi.js
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no-fallthrough.js
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no-floating-decimal.js
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no-func-assign.js
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no-global-assign.js
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no-implicit-coercion.js
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no-implicit-globals.js
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no-implied-eval.js
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no-import-assign.js
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no-inline-comments.js
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no-inner-declarations.js
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no-invalid-regexp.js
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no-invalid-this.js
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no-irregular-whitespace.js
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no-iterator.js
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no-label-var.js
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no-labels.js
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no-lone-blocks.js
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no-lonely-if.js
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no-loop-func.js
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no-loss-of-precision.js
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no-magic-numbers.js
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no-mixed-operators.js
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no-mixed-requires.js
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no-mixed-spaces-and-tabs.js
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no-multi-assign.js
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no-multi-spaces.js
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no-multi-str.js
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no-multiple-empty-lines.js
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no-native-reassign.js
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no-negated-condition.js
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no-negated-in-lhs.js
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no-nested-ternary.js
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no-new-func.js
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no-new-object.js
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no-new-require.js
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no-new-symbol.js
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no-new-wrappers.js
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no-new.js
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no-nonoctal-decimal-escape.js
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no-obj-calls.js
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no-object-constructor.js
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no-octal-escape.js
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no-octal.js
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no-param-reassign.js
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no-path-concat.js
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no-plusplus.js
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no-process-env.js
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no-process-exit.js
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no-promise-executor-return.js
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no-proto.js
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no-redeclare.js
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no-regex-spaces.js
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no-restricted-exports.js
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no-restricted-globals.js
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no-self-assign.js
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no-self-compare.js
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no-sequences.js
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no-setter-return.js
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no-shadow-restricted-names.js
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no-shadow.js
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no-tabs.js
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no-ternary.js
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no-this-before-super.js
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no-throw-literal.js
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no-trailing-spaces.js
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no-unreachable.js
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no-useless-call.js
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no-useless-catch.js
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no-useless-computed-key.js
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no-useless-concat.js
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no-useless-constructor.js
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no-useless-escape.js
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no-useless-rename.js
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no-useless-return.js
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no-var.js
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no-void.js
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no-with.js
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object-curly-newline.js
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object-curly-spacing.js
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object-property-newline.js
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object-shorthand.js
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one-var.js
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operator-assignment.js
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operator-linebreak.js
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prefer-spread.js
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prefer-template.js
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quote-props.js
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quotes.js
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radix.js
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require-atomic-updates.js
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require-await.js
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require-jsdoc.js
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require-yield.js
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rest-spread-spacing.js
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semi-spacing.js
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semi-style.js
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semi.js
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spaced-comment.js
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strict.js
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symbol-description.js
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valid-typeof.js
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vars-on-top.js
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wrap-iife.js
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wrap-regex.js
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Code Editor : comma-dangle.js
/** * @fileoverview Rule to forbid or enforce dangling commas. * @author Ian Christian Myers * @deprecated in ESLint v8.53.0 */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const DEFAULT_OPTIONS = Object.freeze({ arrays: "never", objects: "never", imports: "never", exports: "never", functions: "never" }); /** * Checks whether or not a trailing comma is allowed in a given node. * If the `lastItem` is `RestElement` or `RestProperty`, it disallows trailing commas. * @param {ASTNode} lastItem The node of the last element in the given node. * @returns {boolean} `true` if a trailing comma is allowed. */ function isTrailingCommaAllowed(lastItem) { return !( lastItem.type === "RestElement" || lastItem.type === "RestProperty" || lastItem.type === "ExperimentalRestProperty" ); } /** * Normalize option value. * @param {string|Object|undefined} optionValue The 1st option value to normalize. * @param {number} ecmaVersion The normalized ECMAScript version. * @returns {Object} The normalized option value. */ function normalizeOptions(optionValue, ecmaVersion) { if (typeof optionValue === "string") { return { arrays: optionValue, objects: optionValue, imports: optionValue, exports: optionValue, functions: ecmaVersion < 2017 ? "ignore" : optionValue }; } if (typeof optionValue === "object" && optionValue !== null) { return { arrays: optionValue.arrays || DEFAULT_OPTIONS.arrays, objects: optionValue.objects || DEFAULT_OPTIONS.objects, imports: optionValue.imports || DEFAULT_OPTIONS.imports, exports: optionValue.exports || DEFAULT_OPTIONS.exports, functions: optionValue.functions || DEFAULT_OPTIONS.functions }; } return DEFAULT_OPTIONS; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { deprecated: true, replacedBy: [], type: "layout", docs: { description: "Require or disallow trailing commas", recommended: false, url: "https://eslint.org/docs/latest/rules/comma-dangle" }, fixable: "code", schema: { definitions: { value: { enum: [ "always-multiline", "always", "never", "only-multiline" ] }, valueWithIgnore: { enum: [ "always-multiline", "always", "ignore", "never", "only-multiline" ] } }, type: "array", items: [ { oneOf: [ { $ref: "#/definitions/value" }, { type: "object", properties: { arrays: { $ref: "#/definitions/valueWithIgnore" }, objects: { $ref: "#/definitions/valueWithIgnore" }, imports: { $ref: "#/definitions/valueWithIgnore" }, exports: { $ref: "#/definitions/valueWithIgnore" }, functions: { $ref: "#/definitions/valueWithIgnore" } }, additionalProperties: false } ] } ], additionalItems: false }, messages: { unexpected: "Unexpected trailing comma.", missing: "Missing trailing comma." } }, create(context) { const options = normalizeOptions(context.options[0], context.languageOptions.ecmaVersion); const sourceCode = context.sourceCode; /** * Gets the last item of the given node. * @param {ASTNode} node The node to get. * @returns {ASTNode|null} The last node or null. */ function getLastItem(node) { /** * Returns the last element of an array * @param {any[]} array The input array * @returns {any} The last element */ function last(array) { return array[array.length - 1]; } switch (node.type) { case "ObjectExpression": case "ObjectPattern": return last(node.properties); case "ArrayExpression": case "ArrayPattern": return last(node.elements); case "ImportDeclaration": case "ExportNamedDeclaration": return last(node.specifiers); case "FunctionDeclaration": case "FunctionExpression": case "ArrowFunctionExpression": return last(node.params); case "CallExpression": case "NewExpression": return last(node.arguments); default: return null; } } /** * Gets the trailing comma token of the given node. * If the trailing comma does not exist, this returns the token which is * the insertion point of the trailing comma token. * @param {ASTNode} node The node to get. * @param {ASTNode} lastItem The last item of the node. * @returns {Token} The trailing comma token or the insertion point. */ function getTrailingToken(node, lastItem) { switch (node.type) { case "ObjectExpression": case "ArrayExpression": case "CallExpression": case "NewExpression": return sourceCode.getLastToken(node, 1); default: { const nextToken = sourceCode.getTokenAfter(lastItem); if (astUtils.isCommaToken(nextToken)) { return nextToken; } return sourceCode.getLastToken(lastItem); } } } /** * Checks whether or not a given node is multiline. * This rule handles a given node as multiline when the closing parenthesis * and the last element are not on the same line. * @param {ASTNode} node A node to check. * @returns {boolean} `true` if the node is multiline. */ function isMultiline(node) { const lastItem = getLastItem(node); if (!lastItem) { return false; } const penultimateToken = getTrailingToken(node, lastItem); const lastToken = sourceCode.getTokenAfter(penultimateToken); return lastToken.loc.end.line !== penultimateToken.loc.end.line; } /** * Reports a trailing comma if it exists. * @param {ASTNode} node A node to check. Its type is one of * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern, * ImportDeclaration, and ExportNamedDeclaration. * @returns {void} */ function forbidTrailingComma(node) { const lastItem = getLastItem(node); if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) { return; } const trailingToken = getTrailingToken(node, lastItem); if (astUtils.isCommaToken(trailingToken)) { context.report({ node: lastItem, loc: trailingToken.loc, messageId: "unexpected", *fix(fixer) { yield fixer.remove(trailingToken); /* * Extend the range of the fix to include surrounding tokens to ensure * that the element after which the comma is removed stays _last_. * This intentionally makes conflicts in fix ranges with rules that may be * adding or removing elements in the same autofix pass. * https://github.com/eslint/eslint/issues/15660 */ yield fixer.insertTextBefore(sourceCode.getTokenBefore(trailingToken), ""); yield fixer.insertTextAfter(sourceCode.getTokenAfter(trailingToken), ""); } }); } } /** * Reports the last element of a given node if it does not have a trailing * comma. * * If a given node is `ArrayPattern` which has `RestElement`, the trailing * comma is disallowed, so report if it exists. * @param {ASTNode} node A node to check. Its type is one of * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern, * ImportDeclaration, and ExportNamedDeclaration. * @returns {void} */ function forceTrailingComma(node) { const lastItem = getLastItem(node); if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) { return; } if (!isTrailingCommaAllowed(lastItem)) { forbidTrailingComma(node); return; } const trailingToken = getTrailingToken(node, lastItem); if (trailingToken.value !== ",") { context.report({ node: lastItem, loc: { start: trailingToken.loc.end, end: astUtils.getNextLocation(sourceCode, trailingToken.loc.end) }, messageId: "missing", *fix(fixer) { yield fixer.insertTextAfter(trailingToken, ","); /* * Extend the range of the fix to include surrounding tokens to ensure * that the element after which the comma is inserted stays _last_. * This intentionally makes conflicts in fix ranges with rules that may be * adding or removing elements in the same autofix pass. * https://github.com/eslint/eslint/issues/15660 */ yield fixer.insertTextBefore(trailingToken, ""); yield fixer.insertTextAfter(sourceCode.getTokenAfter(trailingToken), ""); } }); } } /** * If a given node is multiline, reports the last element of a given node * when it does not have a trailing comma. * Otherwise, reports a trailing comma if it exists. * @param {ASTNode} node A node to check. Its type is one of * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern, * ImportDeclaration, and ExportNamedDeclaration. * @returns {void} */ function forceTrailingCommaIfMultiline(node) { if (isMultiline(node)) { forceTrailingComma(node); } else { forbidTrailingComma(node); } } /** * Only if a given node is not multiline, reports the last element of a given node * when it does not have a trailing comma. * Otherwise, reports a trailing comma if it exists. * @param {ASTNode} node A node to check. Its type is one of * ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern, * ImportDeclaration, and ExportNamedDeclaration. * @returns {void} */ function allowTrailingCommaIfMultiline(node) { if (!isMultiline(node)) { forbidTrailingComma(node); } } const predicate = { always: forceTrailingComma, "always-multiline": forceTrailingCommaIfMultiline, "only-multiline": allowTrailingCommaIfMultiline, never: forbidTrailingComma, ignore() {} }; return { ObjectExpression: predicate[options.objects], ObjectPattern: predicate[options.objects], ArrayExpression: predicate[options.arrays], ArrayPattern: predicate[options.arrays], ImportDeclaration: predicate[options.imports], ExportNamedDeclaration: predicate[options.exports], FunctionDeclaration: predicate[options.functions], FunctionExpression: predicate[options.functions], ArrowFunctionExpression: predicate[options.functions], CallExpression: predicate[options.functions], NewExpression: predicate[options.functions] }; } };
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