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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-restricted-globals.js
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no-restricted-imports.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-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-unreachable-loop.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-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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switch-colon-spacing.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 : 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('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Require braces around arrow function bodies", recommended: false, 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] || 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) { 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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