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accessor-pairs.js
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array-bracket-newline.js
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array-bracket-spacing.js
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array-callback-return.js
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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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constructor-super.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-buffer-constructor.js
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no-case-declarations.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-constructor-return.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-misleading-character-class....
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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-prototype-builtins.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-restricted-imports.js
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no-restricted-modules.js
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no-restricted-syntax.js
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no-return-assign.js
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no-return-await.js
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no-script-url.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-spaced-func.js
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no-sparse-arrays.js
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no-sync.js
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no-tabs.js
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no-template-curly-in-string.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-unassigned-vars.js
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no-undef-init.js
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no-undef.js
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no-undefined.js
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no-underscore-dangle.js
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no-unexpected-multiline.js
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no-unmodified-loop-condition.j...
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no-unneeded-ternary.js
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no-unreachable-loop.js
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no-unreachable.js
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no-unsafe-finally.js
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no-unsafe-negation.js
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no-unsafe-optional-chaining.js
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no-unused-expressions.js
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no-unused-labels.js
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no-unused-vars.js
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no-use-before-define.js
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no-useless-assignment.js
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no-useless-backreference.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-warning-comments.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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padded-blocks.js
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prefer-arrow-callback.js
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prefer-const.js
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prefer-destructuring.js
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prefer-named-capture-group.js
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prefer-numeric-literals.js
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prefer-reflect.js
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prefer-spread.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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rest-spread-spacing.js
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semi-style.js
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semi.js
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sort-imports.js
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sort-keys.js
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space-unary-ops.js
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spaced-comment.js
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strict.js
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switch-colon-spacing.js
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symbol-description.js
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template-curly-spacing.js
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template-tag-spacing.js
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unicode-bom.js
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use-isnan.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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yield-star-spacing.js
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yoda.js
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Code Editor : lines-around-comment.js
/** * @fileoverview Enforces empty lines around comments. * @author Jamund Ferguson * @deprecated in ESLint v8.53.0 */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Return an array with any line numbers that are empty. * @param {Array} lines An array of each line of the file. * @returns {Array} An array of line numbers. */ function getEmptyLineNums(lines) { const emptyLines = lines .map((line, i) => ({ code: line.trim(), num: i + 1, })) .filter(line => !line.code) .map(line => line.num); return emptyLines; } /** * Return an array with any line numbers that contain comments. * @param {Array} comments An array of comment tokens. * @returns {Array} An array of line numbers. */ function getCommentLineNums(comments) { const lines = []; comments.forEach(token => { const start = token.loc.start.line; const end = token.loc.end.line; lines.push(start, end); }); return lines; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { deprecated: { message: "Formatting rules are being moved out of ESLint core.", url: "https://eslint.org/blog/2023/10/deprecating-formatting-rules/", deprecatedSince: "8.53.0", availableUntil: "10.0.0", replacedBy: [ { message: "ESLint Stylistic now maintains deprecated stylistic core rules.", url: "https://eslint.style/guide/migration", plugin: { name: "@stylistic/eslint-plugin", url: "https://eslint.style", }, rule: { name: "lines-around-comment", url: "https://eslint.style/rules/lines-around-comment", }, }, ], }, type: "layout", docs: { description: "Require empty lines around comments", recommended: false, url: "https://eslint.org/docs/latest/rules/lines-around-comment", }, fixable: "whitespace", schema: [ { type: "object", properties: { beforeBlockComment: { type: "boolean", default: true, }, afterBlockComment: { type: "boolean", default: false, }, beforeLineComment: { type: "boolean", default: false, }, afterLineComment: { type: "boolean", default: false, }, allowBlockStart: { type: "boolean", default: false, }, allowBlockEnd: { type: "boolean", default: false, }, allowClassStart: { type: "boolean", }, allowClassEnd: { type: "boolean", }, allowObjectStart: { type: "boolean", }, allowObjectEnd: { type: "boolean", }, allowArrayStart: { type: "boolean", }, allowArrayEnd: { type: "boolean", }, ignorePattern: { type: "string", }, applyDefaultIgnorePatterns: { type: "boolean", }, afterHashbangComment: { type: "boolean", default: false, }, }, additionalProperties: false, }, ], messages: { after: "Expected line after comment.", before: "Expected line before comment.", }, }, create(context) { const options = Object.assign({}, context.options[0]); const ignorePattern = options.ignorePattern; const defaultIgnoreRegExp = astUtils.COMMENTS_IGNORE_PATTERN; const customIgnoreRegExp = new RegExp(ignorePattern, "u"); const applyDefaultIgnorePatterns = options.applyDefaultIgnorePatterns !== false; options.beforeBlockComment = typeof options.beforeBlockComment !== "undefined" ? options.beforeBlockComment : true; const sourceCode = context.sourceCode; const lines = sourceCode.lines, numLines = lines.length + 1, comments = sourceCode.getAllComments(), commentLines = getCommentLineNums(comments), emptyLines = getEmptyLineNums(lines), commentAndEmptyLines = new Set(commentLines.concat(emptyLines)); /** * Returns whether or not comments are on lines starting with or ending with code * @param {token} token The comment token to check. * @returns {boolean} True if the comment is not alone. */ function codeAroundComment(token) { let currentToken = token; do { currentToken = sourceCode.getTokenBefore(currentToken, { includeComments: true, }); } while (currentToken && astUtils.isCommentToken(currentToken)); if ( currentToken && astUtils.isTokenOnSameLine(currentToken, token) ) { return true; } currentToken = token; do { currentToken = sourceCode.getTokenAfter(currentToken, { includeComments: true, }); } while (currentToken && astUtils.isCommentToken(currentToken)); if ( currentToken && astUtils.isTokenOnSameLine(token, currentToken) ) { return true; } return false; } /** * Returns whether or not comments are inside a node type or not. * @param {ASTNode} parent The Comment parent node. * @param {string} nodeType The parent type to check against. * @returns {boolean} True if the comment is inside nodeType. */ function isParentNodeType(parent, nodeType) { return ( parent.type === nodeType || (parent.body && parent.body.type === nodeType) || (parent.consequent && parent.consequent.type === nodeType) ); } /** * Returns the parent node that contains the given token. * @param {token} token The token to check. * @returns {ASTNode|null} The parent node that contains the given token. */ function getParentNodeOfToken(token) { const node = sourceCode.getNodeByRangeIndex(token.range[0]); /* * For the purpose of this rule, the comment token is in a `StaticBlock` node only * if it's inside the braces of that `StaticBlock` node. * * Example where this function returns `null`: * * static * // comment * { * } * * Example where this function returns `StaticBlock` node: * * static * { * // comment * } * */ if (node && node.type === "StaticBlock") { const openingBrace = sourceCode.getFirstToken(node, { skip: 1, }); // skip the `static` token return token.range[0] >= openingBrace.range[0] ? node : null; } return node; } /** * Returns whether or not comments are at the parent start or not. * @param {token} token The Comment token. * @param {string} nodeType The parent type to check against. * @returns {boolean} True if the comment is at parent start. */ function isCommentAtParentStart(token, nodeType) { const parent = getParentNodeOfToken(token); if (parent && isParentNodeType(parent, nodeType)) { let parentStartNodeOrToken = parent; if (parent.type === "StaticBlock") { parentStartNodeOrToken = sourceCode.getFirstToken(parent, { skip: 1, }); // opening brace of the static block } else if (parent.type === "SwitchStatement") { parentStartNodeOrToken = sourceCode.getTokenAfter( parent.discriminant, { filter: astUtils.isOpeningBraceToken, }, ); // opening brace of the switch statement } return ( token.loc.start.line - parentStartNodeOrToken.loc.start.line === 1 ); } return false; } /** * Returns whether or not comments are at the parent end or not. * @param {token} token The Comment token. * @param {string} nodeType The parent type to check against. * @returns {boolean} True if the comment is at parent end. */ function isCommentAtParentEnd(token, nodeType) { const parent = getParentNodeOfToken(token); return ( !!parent && isParentNodeType(parent, nodeType) && parent.loc.end.line - token.loc.end.line === 1 ); } /** * Returns whether or not comments are at the block start or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at block start. */ function isCommentAtBlockStart(token) { return ( isCommentAtParentStart(token, "ClassBody") || isCommentAtParentStart(token, "BlockStatement") || isCommentAtParentStart(token, "StaticBlock") || isCommentAtParentStart(token, "SwitchCase") || isCommentAtParentStart(token, "SwitchStatement") ); } /** * Returns whether or not comments are at the block end or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at block end. */ function isCommentAtBlockEnd(token) { return ( isCommentAtParentEnd(token, "ClassBody") || isCommentAtParentEnd(token, "BlockStatement") || isCommentAtParentEnd(token, "StaticBlock") || isCommentAtParentEnd(token, "SwitchCase") || isCommentAtParentEnd(token, "SwitchStatement") ); } /** * Returns whether or not comments are at the class start or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at class start. */ function isCommentAtClassStart(token) { return isCommentAtParentStart(token, "ClassBody"); } /** * Returns whether or not comments are at the class end or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at class end. */ function isCommentAtClassEnd(token) { return isCommentAtParentEnd(token, "ClassBody"); } /** * Returns whether or not comments are at the object start or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at object start. */ function isCommentAtObjectStart(token) { return ( isCommentAtParentStart(token, "ObjectExpression") || isCommentAtParentStart(token, "ObjectPattern") ); } /** * Returns whether or not comments are at the object end or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at object end. */ function isCommentAtObjectEnd(token) { return ( isCommentAtParentEnd(token, "ObjectExpression") || isCommentAtParentEnd(token, "ObjectPattern") ); } /** * Returns whether or not comments are at the array start or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at array start. */ function isCommentAtArrayStart(token) { return ( isCommentAtParentStart(token, "ArrayExpression") || isCommentAtParentStart(token, "ArrayPattern") ); } /** * Returns whether or not comments are at the array end or not. * @param {token} token The Comment token. * @returns {boolean} True if the comment is at array end. */ function isCommentAtArrayEnd(token) { return ( isCommentAtParentEnd(token, "ArrayExpression") || isCommentAtParentEnd(token, "ArrayPattern") ); } /** * Checks if a comment token has lines around it (ignores inline comments) * @param {token} token The Comment token. * @param {Object} opts Options to determine the newline. * @param {boolean} opts.after Should have a newline after this line. * @param {boolean} opts.before Should have a newline before this line. * @returns {void} */ function checkForEmptyLine(token, opts) { if ( applyDefaultIgnorePatterns && defaultIgnoreRegExp.test(token.value) ) { return; } if (ignorePattern && customIgnoreRegExp.test(token.value)) { return; } let after = opts.after, before = opts.before; const prevLineNum = token.loc.start.line - 1, nextLineNum = token.loc.end.line + 1, commentIsNotAlone = codeAroundComment(token); const blockStartAllowed = options.allowBlockStart && isCommentAtBlockStart(token) && !( options.allowClassStart === false && isCommentAtClassStart(token) ), blockEndAllowed = options.allowBlockEnd && isCommentAtBlockEnd(token) && !( options.allowClassEnd === false && isCommentAtClassEnd(token) ), classStartAllowed = options.allowClassStart && isCommentAtClassStart(token), classEndAllowed = options.allowClassEnd && isCommentAtClassEnd(token), objectStartAllowed = options.allowObjectStart && isCommentAtObjectStart(token), objectEndAllowed = options.allowObjectEnd && isCommentAtObjectEnd(token), arrayStartAllowed = options.allowArrayStart && isCommentAtArrayStart(token), arrayEndAllowed = options.allowArrayEnd && isCommentAtArrayEnd(token); const exceptionStartAllowed = blockStartAllowed || classStartAllowed || objectStartAllowed || arrayStartAllowed; const exceptionEndAllowed = blockEndAllowed || classEndAllowed || objectEndAllowed || arrayEndAllowed; // ignore top of the file and bottom of the file if (prevLineNum < 1) { before = false; } if (nextLineNum >= numLines) { after = false; } // we ignore all inline comments if (commentIsNotAlone) { return; } const previousTokenOrComment = sourceCode.getTokenBefore(token, { includeComments: true, }); const nextTokenOrComment = sourceCode.getTokenAfter(token, { includeComments: true, }); // check for newline before if ( !exceptionStartAllowed && before && !commentAndEmptyLines.has(prevLineNum) && !( astUtils.isCommentToken(previousTokenOrComment) && astUtils.isTokenOnSameLine(previousTokenOrComment, token) ) ) { const lineStart = token.range[0] - token.loc.start.column; const range = [lineStart, lineStart]; context.report({ node: token, messageId: "before", fix(fixer) { return fixer.insertTextBeforeRange(range, "\n"); }, }); } // check for newline after if ( !exceptionEndAllowed && after && !commentAndEmptyLines.has(nextLineNum) && !( astUtils.isCommentToken(nextTokenOrComment) && astUtils.isTokenOnSameLine(token, nextTokenOrComment) ) ) { context.report({ node: token, messageId: "after", fix(fixer) { return fixer.insertTextAfter(token, "\n"); }, }); } } //-------------------------------------------------------------------------- // Public //-------------------------------------------------------------------------- return { Program() { comments.forEach(token => { if (token.type === "Line") { if ( options.beforeLineComment || options.afterLineComment ) { checkForEmptyLine(token, { after: options.afterLineComment, before: options.beforeLineComment, }); } } else if (token.type === "Block") { if ( options.beforeBlockComment || options.afterBlockComment ) { checkForEmptyLine(token, { after: options.afterBlockComment, before: options.beforeBlockComment, }); } } else if (token.type === "Shebang") { if (options.afterHashbangComment) { checkForEmptyLine(token, { after: options.afterHashbangComment, before: false, }); } } }); }, }; }, };
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