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accessor-pairs.js
10.95
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array-bracket-newline.js
7.93
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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-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-buffer-constructor.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-binary-expression....
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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
10.34
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no-extra-label.js
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no-extra-parens.js
42.57
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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
12.3
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no-implicit-globals.js
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no-implied-eval.js
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no-import-assign.js
6.03
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no-inline-comments.js
2.63
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no-inner-declarations.js
3.15
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no-invalid-regexp.js
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no-invalid-this.js
4.38
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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-native-nonconstructor.j...
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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
19.02
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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-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
3.4
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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
11.59
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no-useless-assignment.js
18.88
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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
5.8
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no-useless-concat.js
2.9
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no-useless-constructor.js
6.82
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no-useless-escape.js
10.81
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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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nonblock-statement-body-positi...
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object-curly-newline.js
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object-curly-spacing.js
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object-property-newline.js
3.67
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object-shorthand.js
17.59
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one-var-declaration-per-line.j...
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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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padding-line-between-statement...
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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-exponentiation-operator...
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prefer-named-capture-group.js
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prefer-numeric-literals.js
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prefer-object-has-own.js
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prefer-object-spread.js
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prefer-promise-reject-errors.j...
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prefer-reflect.js
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prefer-regex-literals.js
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prefer-rest-params.js
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prefer-spread.js
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prefer-template.js
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quote-props.js
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quotes.js
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radix.js
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require-atomic-updates.js
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require-await.js
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require-unicode-regexp.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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sort-imports.js
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sort-keys.js
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sort-vars.js
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space-before-blocks.js
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space-before-function-paren.js
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space-in-parens.js
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space-infix-ops.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
3.9
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yoda.js
9.48
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Code Editor : prefer-object-spread.js
/** * @fileoverview Rule to disallow using `Object.assign` with an object literal as the first argument and prefer the use of object spread instead * @author Sharmila Jesupaul */ "use strict"; const { CALL, ReferenceTracker } = require("@eslint-community/eslint-utils"); const { isCommaToken, isOpeningParenToken, isClosingParenToken, isParenthesised, } = require("./utils/ast-utils"); const ANY_SPACE = /\s/u; /** * Helper that checks if the Object.assign call has array spread * @param {ASTNode} node The node that the rule warns on * @returns {boolean} - Returns true if the Object.assign call has array spread */ function hasArraySpread(node) { return node.arguments.some(arg => arg.type === "SpreadElement"); } /** * Determines whether the given node is an accessor property (getter/setter). * @param {ASTNode} node Node to check. * @returns {boolean} `true` if the node is a getter or a setter. */ function isAccessorProperty(node) { return ( node.type === "Property" && (node.kind === "get" || node.kind === "set") ); } /** * Determines whether the given object expression node has accessor properties (getters/setters). * @param {ASTNode} node `ObjectExpression` node to check. * @returns {boolean} `true` if the node has at least one getter/setter. */ function hasAccessors(node) { return node.properties.some(isAccessorProperty); } /** * Determines whether the given call expression node has object expression arguments with accessor properties (getters/setters). * @param {ASTNode} node `CallExpression` node to check. * @returns {boolean} `true` if the node has at least one argument that is an object expression with at least one getter/setter. */ function hasArgumentsWithAccessors(node) { return node.arguments .filter(arg => arg.type === "ObjectExpression") .some(hasAccessors); } /** * Helper that checks if the node needs parentheses to be valid JS. * The default is to wrap the node in parentheses to avoid parsing errors. * @param {ASTNode} node The node that the rule warns on * @param {Object} sourceCode in context sourcecode object * @returns {boolean} - Returns true if the node needs parentheses */ function needsParens(node, sourceCode) { const parent = node.parent; switch (parent.type) { case "VariableDeclarator": case "ArrayExpression": case "ReturnStatement": case "CallExpression": case "Property": return false; case "AssignmentExpression": return parent.left === node && !isParenthesised(sourceCode, node); default: return !isParenthesised(sourceCode, node); } } /** * Determines if an argument needs parentheses. The default is to not add parens. * @param {ASTNode} node The node to be checked. * @param {Object} sourceCode in context sourcecode object * @returns {boolean} True if the node needs parentheses */ function argNeedsParens(node, sourceCode) { switch (node.type) { case "AssignmentExpression": case "ArrowFunctionExpression": case "ConditionalExpression": return !isParenthesised(sourceCode, node); default: return false; } } /** * Get the parenthesis tokens of a given ObjectExpression node. * This includes the braces of the object literal and enclosing parentheses. * @param {ASTNode} node The node to get. * @param {Token} leftArgumentListParen The opening paren token of the argument list. * @param {SourceCode} sourceCode The source code object to get tokens. * @returns {Token[]} The parenthesis tokens of the node. This is sorted by the location. */ function getParenTokens(node, leftArgumentListParen, sourceCode) { const parens = [ sourceCode.getFirstToken(node), sourceCode.getLastToken(node), ]; let leftNext = sourceCode.getTokenBefore(node); let rightNext = sourceCode.getTokenAfter(node); // Note: don't include the parens of the argument list. while ( leftNext && rightNext && leftNext.range[0] > leftArgumentListParen.range[0] && isOpeningParenToken(leftNext) && isClosingParenToken(rightNext) ) { parens.push(leftNext, rightNext); leftNext = sourceCode.getTokenBefore(leftNext); rightNext = sourceCode.getTokenAfter(rightNext); } return parens.sort((a, b) => a.range[0] - b.range[0]); } /** * Get the range of a given token and around whitespaces. * @param {Token} token The token to get range. * @param {SourceCode} sourceCode The source code object to get tokens. * @returns {number} The end of the range of the token and around whitespaces. */ function getStartWithSpaces(token, sourceCode) { const text = sourceCode.text; let start = token.range[0]; // If the previous token is a line comment then skip this step to avoid commenting this token out. { const prevToken = sourceCode.getTokenBefore(token, { includeComments: true, }); if (prevToken && prevToken.type === "Line") { return start; } } // Detect spaces before the token. while (ANY_SPACE.test(text[start - 1] || "")) { start -= 1; } return start; } /** * Get the range of a given token and around whitespaces. * @param {Token} token The token to get range. * @param {SourceCode} sourceCode The source code object to get tokens. * @returns {number} The start of the range of the token and around whitespaces. */ function getEndWithSpaces(token, sourceCode) { const text = sourceCode.text; let end = token.range[1]; // Detect spaces after the token. while (ANY_SPACE.test(text[end] || "")) { end += 1; } return end; } /** * Autofixes the Object.assign call to use an object spread instead. * @param {ASTNode|null} node The node that the rule warns on, i.e. the Object.assign call * @param {string} sourceCode sourceCode of the Object.assign call * @returns {Function} autofixer - replaces the Object.assign with a spread object. */ function defineFixer(node, sourceCode) { return function* (fixer) { const leftParen = sourceCode.getTokenAfter( node.callee, isOpeningParenToken, ); const rightParen = sourceCode.getLastToken(node); // Remove everything before the opening paren: callee `Object.assign`, type arguments, and whitespace between the callee and the paren. yield fixer.removeRange([node.range[0], leftParen.range[0]]); // Replace the parens of argument list to braces. if (needsParens(node, sourceCode)) { yield fixer.replaceText(leftParen, "({"); yield fixer.replaceText(rightParen, "})"); } else { yield fixer.replaceText(leftParen, "{"); yield fixer.replaceText(rightParen, "}"); } // Process arguments. for (const argNode of node.arguments) { const innerParens = getParenTokens(argNode, leftParen, sourceCode); const left = innerParens.shift(); const right = innerParens.pop(); if (argNode.type === "ObjectExpression") { const maybeTrailingComma = sourceCode.getLastToken(argNode, 1); const maybeArgumentComma = sourceCode.getTokenAfter(right); /* * Make bare this object literal. * And remove spaces inside of the braces for better formatting. */ for (const innerParen of innerParens) { yield fixer.remove(innerParen); } const leftRange = [ left.range[0], getEndWithSpaces(left, sourceCode), ]; const rightRange = [ Math.max( getStartWithSpaces(right, sourceCode), leftRange[1], ), // Ensure ranges don't overlap right.range[1], ]; yield fixer.removeRange(leftRange); yield fixer.removeRange(rightRange); // Remove the comma of this argument if it's duplication. if ( (argNode.properties.length === 0 || isCommaToken(maybeTrailingComma)) && isCommaToken(maybeArgumentComma) ) { yield fixer.remove(maybeArgumentComma); } } else { // Make spread. if (argNeedsParens(argNode, sourceCode)) { yield fixer.insertTextBefore(left, "...("); yield fixer.insertTextAfter(right, ")"); } else { yield fixer.insertTextBefore(left, "..."); } } } }; } /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Disallow using `Object.assign` with an object literal as the first argument and prefer the use of object spread instead", recommended: false, frozen: true, url: "https://eslint.org/docs/latest/rules/prefer-object-spread", }, schema: [], fixable: "code", messages: { useSpreadMessage: "Use an object spread instead of `Object.assign` eg: `{ ...foo }`.", useLiteralMessage: "Use an object literal instead of `Object.assign`. eg: `{ foo: bar }`.", }, }, create(context) { const sourceCode = context.sourceCode; return { Program(node) { const scope = sourceCode.getScope(node); const tracker = new ReferenceTracker(scope); const trackMap = { Object: { assign: { [CALL]: true }, }, }; // Iterate all calls of `Object.assign` (only of the global variable `Object`). for (const { node: refNode } of tracker.iterateGlobalReferences( trackMap, )) { if ( refNode.arguments.length >= 1 && refNode.arguments[0].type === "ObjectExpression" && !hasArraySpread(refNode) && !( refNode.arguments.length > 1 && hasArgumentsWithAccessors(refNode) ) ) { const messageId = refNode.arguments.length === 1 ? "useLiteralMessage" : "useSpreadMessage"; const fix = defineFixer(refNode, sourceCode); context.report({ node: refNode, messageId, fix }); } } }, }; }, };
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