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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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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-call-argument-newline...
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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-caller.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-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-properties.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-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-unsafe-negation.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-destructuring.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-jsdoc.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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Code Editor : prefer-destructuring.js
/** * @fileoverview Prefer destructuring from arrays and objects * @author Alex LaFroscia */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const PRECEDENCE_OF_ASSIGNMENT_EXPR = astUtils.getPrecedence({ type: "AssignmentExpression" }); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Require destructuring from arrays and/or objects", recommended: false, url: "https://eslint.org/docs/latest/rules/prefer-destructuring" }, fixable: "code", schema: [ { /* * old support {array: Boolean, object: Boolean} * new support {VariableDeclarator: {}, AssignmentExpression: {}} */ oneOf: [ { type: "object", properties: { VariableDeclarator: { type: "object", properties: { array: { type: "boolean" }, object: { type: "boolean" } }, additionalProperties: false }, AssignmentExpression: { type: "object", properties: { array: { type: "boolean" }, object: { type: "boolean" } }, additionalProperties: false } }, additionalProperties: false }, { type: "object", properties: { array: { type: "boolean" }, object: { type: "boolean" } }, additionalProperties: false } ] }, { type: "object", properties: { enforceForRenamedProperties: { type: "boolean" } }, additionalProperties: false } ], messages: { preferDestructuring: "Use {{type}} destructuring." } }, create(context) { const enabledTypes = context.options[0]; const enforceForRenamedProperties = context.options[1] && context.options[1].enforceForRenamedProperties; let normalizedOptions = { VariableDeclarator: { array: true, object: true }, AssignmentExpression: { array: true, object: true } }; if (enabledTypes) { normalizedOptions = typeof enabledTypes.array !== "undefined" || typeof enabledTypes.object !== "undefined" ? { VariableDeclarator: enabledTypes, AssignmentExpression: enabledTypes } : enabledTypes; } //-------------------------------------------------------------------------- // Helpers //-------------------------------------------------------------------------- /** * Checks if destructuring type should be checked. * @param {string} nodeType "AssignmentExpression" or "VariableDeclarator" * @param {string} destructuringType "array" or "object" * @returns {boolean} `true` if the destructuring type should be checked for the given node */ function shouldCheck(nodeType, destructuringType) { return normalizedOptions && normalizedOptions[nodeType] && normalizedOptions[nodeType][destructuringType]; } /** * Determines if the given node is accessing an array index * * This is used to differentiate array index access from object property * access. * @param {ASTNode} node the node to evaluate * @returns {boolean} whether or not the node is an integer */ function isArrayIndexAccess(node) { return Number.isInteger(node.property.value); } /** * Report that the given node should use destructuring * @param {ASTNode} reportNode the node to report * @param {string} type the type of destructuring that should have been done * @param {Function|null} fix the fix function or null to pass to context.report * @returns {void} */ function report(reportNode, type, fix) { context.report({ node: reportNode, messageId: "preferDestructuring", data: { type }, fix }); } /** * Determines if a node should be fixed into object destructuring * * The fixer only fixes the simplest case of object destructuring, * like: `let x = a.x`; * * Assignment expression is not fixed. * Array destructuring is not fixed. * Renamed property is not fixed. * @param {ASTNode} node the node to evaluate * @returns {boolean} whether or not the node should be fixed */ function shouldFix(node) { return node.type === "VariableDeclarator" && node.id.type === "Identifier" && node.init.type === "MemberExpression" && !node.init.computed && node.init.property.type === "Identifier" && node.id.name === node.init.property.name; } /** * Fix a node into object destructuring. * This function only handles the simplest case of object destructuring, * see {@link shouldFix}. * @param {SourceCodeFixer} fixer the fixer object * @param {ASTNode} node the node to be fixed. * @returns {Object} a fix for the node */ function fixIntoObjectDestructuring(fixer, node) { const rightNode = node.init; const sourceCode = context.sourceCode; // Don't fix if that would remove any comments. Only comments inside `rightNode.object` can be preserved. if (sourceCode.getCommentsInside(node).length > sourceCode.getCommentsInside(rightNode.object).length) { return null; } let objectText = sourceCode.getText(rightNode.object); if (astUtils.getPrecedence(rightNode.object) < PRECEDENCE_OF_ASSIGNMENT_EXPR) { objectText = `(${objectText})`; } return fixer.replaceText( node, `{${rightNode.property.name}} = ${objectText}` ); } /** * Check that the `prefer-destructuring` rules are followed based on the * given left- and right-hand side of the assignment. * * Pulled out into a separate method so that VariableDeclarators and * AssignmentExpressions can share the same verification logic. * @param {ASTNode} leftNode the left-hand side of the assignment * @param {ASTNode} rightNode the right-hand side of the assignment * @param {ASTNode} reportNode the node to report the error on * @returns {void} */ function performCheck(leftNode, rightNode, reportNode) { if ( rightNode.type !== "MemberExpression" || rightNode.object.type === "Super" || rightNode.property.type === "PrivateIdentifier" ) { return; } if (isArrayIndexAccess(rightNode)) { if (shouldCheck(reportNode.type, "array")) { report(reportNode, "array", null); } return; } const fix = shouldFix(reportNode) ? fixer => fixIntoObjectDestructuring(fixer, reportNode) : null; if (shouldCheck(reportNode.type, "object") && enforceForRenamedProperties) { report(reportNode, "object", fix); return; } if (shouldCheck(reportNode.type, "object")) { const property = rightNode.property; if ( (property.type === "Literal" && leftNode.name === property.value) || (property.type === "Identifier" && leftNode.name === property.name && !rightNode.computed) ) { report(reportNode, "object", fix); } } } /** * Check if a given variable declarator is coming from an property access * that should be using destructuring instead * @param {ASTNode} node the variable declarator to check * @returns {void} */ function checkVariableDeclarator(node) { // Skip if variable is declared without assignment if (!node.init) { return; } // We only care about member expressions past this point if (node.init.type !== "MemberExpression") { return; } performCheck(node.id, node.init, node); } /** * Run the `prefer-destructuring` check on an AssignmentExpression * @param {ASTNode} node the AssignmentExpression node * @returns {void} */ function checkAssignmentExpression(node) { if (node.operator === "=") { performCheck(node.left, node.right, node); } } //-------------------------------------------------------------------------- // Public //-------------------------------------------------------------------------- return { VariableDeclarator: checkVariableDeclarator, AssignmentExpression: checkAssignmentExpression }; } };
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