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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-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-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-self-assign.js
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no-self-compare.js
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no-sequences.js
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no-shadow-restricted-names.js
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no-shadow.js
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no-sync.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-undef.js
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no-unexpected-multiline.js
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no-unreachable-loop.js
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no-unreachable.js
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no-useless-call.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-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 : multiline-comment-style.js
/** * @fileoverview enforce a particular style for multiline comments * @author Teddy Katz */ "use strict"; const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Enforce a particular style for multiline comments", recommended: false, url: "https://eslint.org/docs/latest/rules/multiline-comment-style" }, fixable: "whitespace", schema: { anyOf: [ { type: "array", items: [ { enum: ["starred-block", "bare-block"] } ], additionalItems: false }, { type: "array", items: [ { enum: ["separate-lines"] }, { type: "object", properties: { checkJSDoc: { type: "boolean" } }, additionalProperties: false } ], additionalItems: false } ] }, messages: { expectedBlock: "Expected a block comment instead of consecutive line comments.", expectedBareBlock: "Expected a block comment without padding stars.", startNewline: "Expected a linebreak after '/*'.", endNewline: "Expected a linebreak before '*/'.", missingStar: "Expected a '*' at the start of this line.", alignment: "Expected this line to be aligned with the start of the comment.", expectedLines: "Expected multiple line comments instead of a block comment." } }, create(context) { const sourceCode = context.sourceCode; const option = context.options[0] || "starred-block"; const params = context.options[1] || {}; const checkJSDoc = !!params.checkJSDoc; //---------------------------------------------------------------------- // Helpers //---------------------------------------------------------------------- /** * Checks if a comment line is starred. * @param {string} line A string representing a comment line. * @returns {boolean} Whether or not the comment line is starred. */ function isStarredCommentLine(line) { return /^\s*\*/u.test(line); } /** * Checks if a comment group is in starred-block form. * @param {Token[]} commentGroup A group of comments, containing either multiple line comments or a single block comment. * @returns {boolean} Whether or not the comment group is in starred block form. */ function isStarredBlockComment([firstComment]) { if (firstComment.type !== "Block") { return false; } const lines = firstComment.value.split(astUtils.LINEBREAK_MATCHER); // The first and last lines can only contain whitespace. return lines.length > 0 && lines.every((line, i) => (i === 0 || i === lines.length - 1 ? /^\s*$/u : /^\s*\*/u).test(line)); } /** * Checks if a comment group is in JSDoc form. * @param {Token[]} commentGroup A group of comments, containing either multiple line comments or a single block comment. * @returns {boolean} Whether or not the comment group is in JSDoc form. */ function isJSDocComment([firstComment]) { if (firstComment.type !== "Block") { return false; } const lines = firstComment.value.split(astUtils.LINEBREAK_MATCHER); return /^\*\s*$/u.test(lines[0]) && lines.slice(1, -1).every(line => /^\s* /u.test(line)) && /^\s*$/u.test(lines[lines.length - 1]); } /** * Processes a comment group that is currently in separate-line form, calculating the offset for each line. * @param {Token[]} commentGroup A group of comments containing multiple line comments. * @returns {string[]} An array of the processed lines. */ function processSeparateLineComments(commentGroup) { const allLinesHaveLeadingSpace = commentGroup .map(({ value }) => value) .filter(line => line.trim().length) .every(line => line.startsWith(" ")); return commentGroup.map(({ value }) => (allLinesHaveLeadingSpace ? value.replace(/^ /u, "") : value)); } /** * Processes a comment group that is currently in starred-block form, calculating the offset for each line. * @param {Token} comment A single block comment token in starred-block form. * @returns {string[]} An array of the processed lines. */ function processStarredBlockComment(comment) { const lines = comment.value.split(astUtils.LINEBREAK_MATCHER) .filter((line, i, linesArr) => !(i === 0 || i === linesArr.length - 1)) .map(line => line.replace(/^\s*$/u, "")); const allLinesHaveLeadingSpace = lines .map(line => line.replace(/\s*\*/u, "")) .filter(line => line.trim().length) .every(line => line.startsWith(" ")); return lines.map(line => line.replace(allLinesHaveLeadingSpace ? /\s*\* ?/u : /\s*\*/u, "")); } /** * Processes a comment group that is currently in bare-block form, calculating the offset for each line. * @param {Token} comment A single block comment token in bare-block form. * @returns {string[]} An array of the processed lines. */ function processBareBlockComment(comment) { const lines = comment.value.split(astUtils.LINEBREAK_MATCHER).map(line => line.replace(/^\s*$/u, "")); const leadingWhitespace = `${sourceCode.text.slice(comment.range[0] - comment.loc.start.column, comment.range[0])} `; let offset = ""; /* * Calculate the offset of the least indented line and use that as the basis for offsetting all the lines. * The first line should not be checked because it is inline with the opening block comment delimiter. */ for (const [i, line] of lines.entries()) { if (!line.trim().length || i === 0) { continue; } const [, lineOffset] = line.match(/^(\s*\*?\s*)/u); if (lineOffset.length < leadingWhitespace.length) { const newOffset = leadingWhitespace.slice(lineOffset.length - leadingWhitespace.length); if (newOffset.length > offset.length) { offset = newOffset; } } } return lines.map(line => { const match = line.match(/^(\s*\*?\s*)(.*)/u); const [, lineOffset, lineContents] = match; if (lineOffset.length > leadingWhitespace.length) { return `${lineOffset.slice(leadingWhitespace.length - (offset.length + lineOffset.length))}${lineContents}`; } if (lineOffset.length < leadingWhitespace.length) { return `${lineOffset.slice(leadingWhitespace.length)}${lineContents}`; } return lineContents; }); } /** * Gets a list of comment lines in a group, formatting leading whitespace as necessary. * @param {Token[]} commentGroup A group of comments containing either multiple line comments or a single block comment. * @returns {string[]} A list of comment lines. */ function getCommentLines(commentGroup) { const [firstComment] = commentGroup; if (firstComment.type === "Line") { return processSeparateLineComments(commentGroup); } if (isStarredBlockComment(commentGroup)) { return processStarredBlockComment(firstComment); } return processBareBlockComment(firstComment); } /** * Gets the initial offset (whitespace) from the beginning of a line to a given comment token. * @param {Token} comment The token to check. * @returns {string} The offset from the beginning of a line to the token. */ function getInitialOffset(comment) { return sourceCode.text.slice(comment.range[0] - comment.loc.start.column, comment.range[0]); } /** * Converts a comment into starred-block form * @param {Token} firstComment The first comment of the group being converted * @param {string[]} commentLinesList A list of lines to appear in the new starred-block comment * @returns {string} A representation of the comment value in starred-block form, excluding start and end markers */ function convertToStarredBlock(firstComment, commentLinesList) { const initialOffset = getInitialOffset(firstComment); return `/*\n${commentLinesList.map(line => `${initialOffset} * ${line}`).join("\n")}\n${initialOffset} */`; } /** * Converts a comment into separate-line form * @param {Token} firstComment The first comment of the group being converted * @param {string[]} commentLinesList A list of lines to appear in the new starred-block comment * @returns {string} A representation of the comment value in separate-line form */ function convertToSeparateLines(firstComment, commentLinesList) { return commentLinesList.map(line => `// ${line}`).join(`\n${getInitialOffset(firstComment)}`); } /** * Converts a comment into bare-block form * @param {Token} firstComment The first comment of the group being converted * @param {string[]} commentLinesList A list of lines to appear in the new starred-block comment * @returns {string} A representation of the comment value in bare-block form */ function convertToBlock(firstComment, commentLinesList) { return `/* ${commentLinesList.join(`\n${getInitialOffset(firstComment)} `)} */`; } /** * Each method checks a group of comments to see if it's valid according to the given option. * @param {Token[]} commentGroup A list of comments that appear together. This will either contain a single * block comment or multiple line comments. * @returns {void} */ const commentGroupCheckers = { "starred-block"(commentGroup) { const [firstComment] = commentGroup; const commentLines = getCommentLines(commentGroup); if (commentLines.some(value => value.includes("*/"))) { return; } if (commentGroup.length > 1) { context.report({ loc: { start: firstComment.loc.start, end: commentGroup[commentGroup.length - 1].loc.end }, messageId: "expectedBlock", fix(fixer) { const range = [firstComment.range[0], commentGroup[commentGroup.length - 1].range[1]]; return commentLines.some(value => value.startsWith("/")) ? null : fixer.replaceTextRange(range, convertToStarredBlock(firstComment, commentLines)); } }); } else { const lines = firstComment.value.split(astUtils.LINEBREAK_MATCHER); const expectedLeadingWhitespace = getInitialOffset(firstComment); const expectedLinePrefix = `${expectedLeadingWhitespace} *`; if (!/^\*?\s*$/u.test(lines[0])) { const start = firstComment.value.startsWith("*") ? firstComment.range[0] + 1 : firstComment.range[0]; context.report({ loc: { start: firstComment.loc.start, end: { line: firstComment.loc.start.line, column: firstComment.loc.start.column + 2 } }, messageId: "startNewline", fix: fixer => fixer.insertTextAfterRange([start, start + 2], `\n${expectedLinePrefix}`) }); } if (!/^\s*$/u.test(lines[lines.length - 1])) { context.report({ loc: { start: { line: firstComment.loc.end.line, column: firstComment.loc.end.column - 2 }, end: firstComment.loc.end }, messageId: "endNewline", fix: fixer => fixer.replaceTextRange([firstComment.range[1] - 2, firstComment.range[1]], `\n${expectedLinePrefix}/`) }); } for (let lineNumber = firstComment.loc.start.line + 1; lineNumber <= firstComment.loc.end.line; lineNumber++) { const lineText = sourceCode.lines[lineNumber - 1]; const errorType = isStarredCommentLine(lineText) ? "alignment" : "missingStar"; if (!lineText.startsWith(expectedLinePrefix)) { context.report({ loc: { start: { line: lineNumber, column: 0 }, end: { line: lineNumber, column: lineText.length } }, messageId: errorType, fix(fixer) { const lineStartIndex = sourceCode.getIndexFromLoc({ line: lineNumber, column: 0 }); if (errorType === "alignment") { const [, commentTextPrefix = ""] = lineText.match(/^(\s*\*)/u) || []; const commentTextStartIndex = lineStartIndex + commentTextPrefix.length; return fixer.replaceTextRange([lineStartIndex, commentTextStartIndex], expectedLinePrefix); } const [, commentTextPrefix = ""] = lineText.match(/^(\s*)/u) || []; const commentTextStartIndex = lineStartIndex + commentTextPrefix.length; let offset; for (const [idx, line] of lines.entries()) { if (!/\S+/u.test(line)) { continue; } const lineTextToAlignWith = sourceCode.lines[firstComment.loc.start.line - 1 + idx]; const [, prefix = "", initialOffset = ""] = lineTextToAlignWith.match(/^(\s*(?:\/?\*)?(\s*))/u) || []; offset = `${commentTextPrefix.slice(prefix.length)}${initialOffset}`; if (/^\s*\//u.test(lineText) && offset.length === 0) { offset += " "; } break; } return fixer.replaceTextRange([lineStartIndex, commentTextStartIndex], `${expectedLinePrefix}${offset}`); } }); } } } }, "separate-lines"(commentGroup) { const [firstComment] = commentGroup; const isJSDoc = isJSDocComment(commentGroup); if (firstComment.type !== "Block" || (!checkJSDoc && isJSDoc)) { return; } let commentLines = getCommentLines(commentGroup); if (isJSDoc) { commentLines = commentLines.slice(1, commentLines.length - 1); } const tokenAfter = sourceCode.getTokenAfter(firstComment, { includeComments: true }); if (tokenAfter && firstComment.loc.end.line === tokenAfter.loc.start.line) { return; } context.report({ loc: { start: firstComment.loc.start, end: { line: firstComment.loc.start.line, column: firstComment.loc.start.column + 2 } }, messageId: "expectedLines", fix(fixer) { return fixer.replaceText(firstComment, convertToSeparateLines(firstComment, commentLines)); } }); }, "bare-block"(commentGroup) { if (isJSDocComment(commentGroup)) { return; } const [firstComment] = commentGroup; const commentLines = getCommentLines(commentGroup); // Disallows consecutive line comments in favor of using a block comment. if (firstComment.type === "Line" && commentLines.length > 1 && !commentLines.some(value => value.includes("*/"))) { context.report({ loc: { start: firstComment.loc.start, end: commentGroup[commentGroup.length - 1].loc.end }, messageId: "expectedBlock", fix(fixer) { return fixer.replaceTextRange( [firstComment.range[0], commentGroup[commentGroup.length - 1].range[1]], convertToBlock(firstComment, commentLines) ); } }); } // Prohibits block comments from having a * at the beginning of each line. if (isStarredBlockComment(commentGroup)) { context.report({ loc: { start: firstComment.loc.start, end: { line: firstComment.loc.start.line, column: firstComment.loc.start.column + 2 } }, messageId: "expectedBareBlock", fix(fixer) { return fixer.replaceText(firstComment, convertToBlock(firstComment, commentLines)); } }); } } }; //---------------------------------------------------------------------- // Public //---------------------------------------------------------------------- return { Program() { return sourceCode.getAllComments() .filter(comment => comment.type !== "Shebang") .filter(comment => !astUtils.COMMENTS_IGNORE_PATTERN.test(comment.value)) .filter(comment => { const tokenBefore = sourceCode.getTokenBefore(comment, { includeComments: true }); return !tokenBefore || tokenBefore.loc.end.line < comment.loc.start.line; }) .reduce((commentGroups, comment, index, commentList) => { const tokenBefore = sourceCode.getTokenBefore(comment, { includeComments: true }); if ( comment.type === "Line" && index && commentList[index - 1].type === "Line" && tokenBefore && tokenBefore.loc.end.line === comment.loc.start.line - 1 && tokenBefore === commentList[index - 1] ) { commentGroups[commentGroups.length - 1].push(comment); } else { commentGroups.push([comment]); } return commentGroups; }, []) .filter(commentGroup => !(commentGroup.length === 1 && commentGroup[0].loc.start.line === commentGroup[0].loc.end.line)) .forEach(commentGroupCheckers[option]); } }; } };
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