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accessor-pairs.js
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array-bracket-newline.js
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array-bracket-spacing.js
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array-callback-return.js
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array-element-newline.js
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arrow-body-style.js
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arrow-parens.js
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arrow-spacing.js
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block-scoped-var.js
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block-spacing.js
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brace-style.js
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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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constructor-super.js
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curly.js
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default-case.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-confusing-arrow.js
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no-const-assign.js
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no-constant-condition.js
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no-constructor-return.js
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no-continue.js
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no-control-regex.js
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no-debugger.js
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no-delete-var.js
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no-div-regex.js
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no-dupe-args.js
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no-dupe-class-members.js
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no-dupe-else-if.js
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no-dupe-keys.js
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no-duplicate-case.js
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no-duplicate-imports.js
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no-else-return.js
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no-empty-character-class.js
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no-empty-function.js
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no-empty-pattern.js
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no-empty-static-block.js
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no-empty.js
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no-eq-null.js
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no-eval.js
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no-ex-assign.js
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no-extend-native.js
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no-extra-bind.js
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no-extra-boolean-cast.js
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no-extra-label.js
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no-extra-parens.js
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no-extra-semi.js
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no-fallthrough.js
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no-floating-decimal.js
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no-func-assign.js
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no-global-assign.js
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no-implicit-coercion.js
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no-implicit-globals.js
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no-implied-eval.js
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no-import-assign.js
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no-inline-comments.js
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no-inner-declarations.js
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no-invalid-regexp.js
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no-invalid-this.js
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no-irregular-whitespace.js
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no-iterator.js
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no-label-var.js
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no-labels.js
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no-lone-blocks.js
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no-lonely-if.js
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no-loop-func.js
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no-loss-of-precision.js
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no-magic-numbers.js
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no-misleading-character-class....
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no-mixed-operators.js
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no-mixed-requires.js
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no-mixed-spaces-and-tabs.js
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no-multi-assign.js
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no-multi-spaces.js
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no-multi-str.js
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no-multiple-empty-lines.js
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no-native-reassign.js
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no-negated-condition.js
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no-negated-in-lhs.js
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no-nested-ternary.js
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no-new-func.js
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no-new-object.js
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no-new-require.js
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no-new-symbol.js
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no-new-wrappers.js
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no-new.js
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no-nonoctal-decimal-escape.js
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no-obj-calls.js
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no-object-constructor.js
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no-octal-escape.js
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no-octal.js
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no-param-reassign.js
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no-path-concat.js
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no-plusplus.js
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no-process-env.js
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no-promise-executor-return.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-imports.js
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no-restricted-modules.js
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no-return-assign.js
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no-sequences.js
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no-shadow.js
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no-spaced-func.js
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no-tabs.js
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no-template-curly-in-string.js
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no-ternary.js
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no-this-before-super.js
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no-throw-literal.js
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no-trailing-spaces.js
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no-unassigned-vars.js
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no-undef-init.js
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no-undef.js
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no-undefined.js
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no-underscore-dangle.js
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no-unexpected-multiline.js
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no-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-labels.js
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no-unused-vars.js
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no-use-before-define.js
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no-useless-assignment.js
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no-useless-backreference.js
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no-useless-call.js
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no-useless-catch.js
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no-useless-computed-key.js
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no-useless-concat.js
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no-useless-constructor.js
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no-useless-escape.js
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no-useless-rename.js
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no-useless-return.js
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no-var.js
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no-with.js
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object-curly-newline.js
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object-curly-spacing.js
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object-property-newline.js
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object-shorthand.js
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one-var.js
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operator-assignment.js
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operator-linebreak.js
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padded-blocks.js
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prefer-arrow-callback.js
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prefer-const.js
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prefer-destructuring.js
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prefer-numeric-literals.js
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prefer-reflect.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-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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spaced-comment.js
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strict.js
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symbol-description.js
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template-curly-spacing.js
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template-tag-spacing.js
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unicode-bom.js
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use-isnan.js
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valid-typeof.js
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vars-on-top.js
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wrap-iife.js
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wrap-regex.js
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yield-star-spacing.js
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yoda.js
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Code Editor : semi.js
/** * @fileoverview Rule to flag missing semicolons. * @author Nicholas C. Zakas * @deprecated in ESLint v8.53.0 */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const FixTracker = require("./utils/fix-tracker"); const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { deprecated: { message: "Formatting rules are being moved out of ESLint core.", url: "https://eslint.org/blog/2023/10/deprecating-formatting-rules/", deprecatedSince: "8.53.0", availableUntil: "10.0.0", replacedBy: [ { message: "ESLint Stylistic now maintains deprecated stylistic core rules.", url: "https://eslint.style/guide/migration", plugin: { name: "@stylistic/eslint-plugin", url: "https://eslint.style", }, rule: { name: "semi", url: "https://eslint.style/rules/semi", }, }, ], }, type: "layout", docs: { description: "Require or disallow semicolons instead of ASI", recommended: false, url: "https://eslint.org/docs/latest/rules/semi", }, fixable: "code", schema: { anyOf: [ { type: "array", items: [ { enum: ["never"], }, { type: "object", properties: { beforeStatementContinuationChars: { enum: ["always", "any", "never"], }, }, additionalProperties: false, }, ], minItems: 0, maxItems: 2, }, { type: "array", items: [ { enum: ["always"], }, { type: "object", properties: { omitLastInOneLineBlock: { type: "boolean" }, omitLastInOneLineClassBody: { type: "boolean" }, }, additionalProperties: false, }, ], minItems: 0, maxItems: 2, }, ], }, messages: { missingSemi: "Missing semicolon.", extraSemi: "Extra semicolon.", }, }, create(context) { const OPT_OUT_PATTERN = /^[-[(/+`]/u; // One of [(/+-` const unsafeClassFieldNames = new Set(["get", "set", "static"]); const unsafeClassFieldFollowers = new Set(["*", "in", "instanceof"]); const options = context.options[1]; const never = context.options[0] === "never"; const exceptOneLine = Boolean( options && options.omitLastInOneLineBlock, ); const exceptOneLineClassBody = Boolean( options && options.omitLastInOneLineClassBody, ); const beforeStatementContinuationChars = (options && options.beforeStatementContinuationChars) || "any"; const sourceCode = context.sourceCode; //-------------------------------------------------------------------------- // Helpers //-------------------------------------------------------------------------- /** * Reports a semicolon error with appropriate location and message. * @param {ASTNode} node The node with an extra or missing semicolon. * @param {boolean} missing True if the semicolon is missing. * @returns {void} */ function report(node, missing) { const lastToken = sourceCode.getLastToken(node); let messageId, fix, loc; if (!missing) { messageId = "missingSemi"; loc = { start: lastToken.loc.end, end: astUtils.getNextLocation( sourceCode, lastToken.loc.end, ), }; fix = function (fixer) { return fixer.insertTextAfter(lastToken, ";"); }; } else { messageId = "extraSemi"; loc = lastToken.loc; fix = function (fixer) { /* * Expand the replacement range to include the surrounding * tokens to avoid conflicting with no-extra-semi. * https://github.com/eslint/eslint/issues/7928 */ return new FixTracker(fixer, sourceCode) .retainSurroundingTokens(lastToken) .remove(lastToken); }; } context.report({ node, loc, messageId, fix, }); } /** * Check whether a given semicolon token is redundant. * @param {Token} semiToken A semicolon token to check. * @returns {boolean} `true` if the next token is `;` or `}`. */ function isRedundantSemi(semiToken) { const nextToken = sourceCode.getTokenAfter(semiToken); return ( !nextToken || astUtils.isClosingBraceToken(nextToken) || astUtils.isSemicolonToken(nextToken) ); } /** * Check whether a given token is the closing brace of an arrow function. * @param {Token} lastToken A token to check. * @returns {boolean} `true` if the token is the closing brace of an arrow function. */ function isEndOfArrowBlock(lastToken) { if (!astUtils.isClosingBraceToken(lastToken)) { return false; } const node = sourceCode.getNodeByRangeIndex(lastToken.range[0]); return ( node.type === "BlockStatement" && node.parent.type === "ArrowFunctionExpression" ); } /** * Checks if a given PropertyDefinition node followed by a semicolon * can safely remove that semicolon. It is not to safe to remove if * the class field name is "get", "set", or "static", or if * followed by a generator method. * @param {ASTNode} node The node to check. * @returns {boolean} `true` if the node cannot have the semicolon * removed. */ function maybeClassFieldAsiHazard(node) { if (node.type !== "PropertyDefinition") { return false; } /* * Computed property names and non-identifiers are always safe * as they can be distinguished from keywords easily. */ const needsNameCheck = !node.computed && node.key.type === "Identifier"; /* * Certain names are problematic unless they also have a * a way to distinguish between keywords and property * names. */ if (needsNameCheck && unsafeClassFieldNames.has(node.key.name)) { /* * Special case: If the field name is `static`, * it is only valid if the field is marked as static, * so "static static" is okay but "static" is not. */ const isStaticStatic = node.static && node.key.name === "static"; /* * For other unsafe names, we only care if there is no * initializer. No initializer = hazard. */ if (!isStaticStatic && !node.value) { return true; } } const followingToken = sourceCode.getTokenAfter(node); return unsafeClassFieldFollowers.has(followingToken.value); } /** * Check whether a given node is on the same line with the next token. * @param {Node} node A statement node to check. * @returns {boolean} `true` if the node is on the same line with the next token. */ function isOnSameLineWithNextToken(node) { const prevToken = sourceCode.getLastToken(node, 1); const nextToken = sourceCode.getTokenAfter(node); return ( !!nextToken && astUtils.isTokenOnSameLine(prevToken, nextToken) ); } /** * Check whether a given node can connect the next line if the next line is unreliable. * @param {Node} node A statement node to check. * @returns {boolean} `true` if the node can connect the next line. */ function maybeAsiHazardAfter(node) { const t = node.type; if ( t === "DoWhileStatement" || t === "BreakStatement" || t === "ContinueStatement" || t === "DebuggerStatement" || t === "ImportDeclaration" || t === "ExportAllDeclaration" ) { return false; } if (t === "ReturnStatement") { return Boolean(node.argument); } if (t === "ExportNamedDeclaration") { return Boolean(node.declaration); } if (isEndOfArrowBlock(sourceCode.getLastToken(node, 1))) { return false; } return true; } /** * Check whether a given token can connect the previous statement. * @param {Token} token A token to check. * @returns {boolean} `true` if the token is one of `[`, `(`, `/`, `+`, `-`, ```, `++`, and `--`. */ function maybeAsiHazardBefore(token) { return ( Boolean(token) && OPT_OUT_PATTERN.test(token.value) && token.value !== "++" && token.value !== "--" ); } /** * Check if the semicolon of a given node is unnecessary, only true if: * - next token is a valid statement divider (`;` or `}`). * - next token is on a new line and the node is not connectable to the new line. * @param {Node} node A statement node to check. * @returns {boolean} whether the semicolon is unnecessary. */ function canRemoveSemicolon(node) { if (isRedundantSemi(sourceCode.getLastToken(node))) { return true; // `;;` or `;}` } if (maybeClassFieldAsiHazard(node)) { return false; } if (isOnSameLineWithNextToken(node)) { return false; // One liner. } // continuation characters should not apply to class fields if ( node.type !== "PropertyDefinition" && beforeStatementContinuationChars === "never" && !maybeAsiHazardAfter(node) ) { return true; // ASI works. This statement doesn't connect to the next. } if (!maybeAsiHazardBefore(sourceCode.getTokenAfter(node))) { return true; // ASI works. The next token doesn't connect to this statement. } return false; } /** * Checks a node to see if it's the last item in a one-liner block. * Block is any `BlockStatement` or `StaticBlock` node. Block is a one-liner if its * braces (and consequently everything between them) are on the same line. * @param {ASTNode} node The node to check. * @returns {boolean} whether the node is the last item in a one-liner block. */ function isLastInOneLinerBlock(node) { const parent = node.parent; const nextToken = sourceCode.getTokenAfter(node); if (!nextToken || nextToken.value !== "}") { return false; } if (parent.type === "BlockStatement") { return parent.loc.start.line === parent.loc.end.line; } if (parent.type === "StaticBlock") { const openingBrace = sourceCode.getFirstToken(parent, { skip: 1, }); // skip the `static` token return openingBrace.loc.start.line === parent.loc.end.line; } return false; } /** * Checks a node to see if it's the last item in a one-liner `ClassBody` node. * ClassBody is a one-liner if its braces (and consequently everything between them) are on the same line. * @param {ASTNode} node The node to check. * @returns {boolean} whether the node is the last item in a one-liner ClassBody. */ function isLastInOneLinerClassBody(node) { const parent = node.parent; const nextToken = sourceCode.getTokenAfter(node); if (!nextToken || nextToken.value !== "}") { return false; } if (parent.type === "ClassBody") { return parent.loc.start.line === parent.loc.end.line; } return false; } /** * Checks a node to see if it's followed by a semicolon. * @param {ASTNode} node The node to check. * @returns {void} */ function checkForSemicolon(node) { const isSemi = astUtils.isSemicolonToken( sourceCode.getLastToken(node), ); if (never) { if (isSemi && canRemoveSemicolon(node)) { report(node, true); } else if ( !isSemi && beforeStatementContinuationChars === "always" && node.type !== "PropertyDefinition" && maybeAsiHazardBefore(sourceCode.getTokenAfter(node)) ) { report(node); } } else { const oneLinerBlock = exceptOneLine && isLastInOneLinerBlock(node); const oneLinerClassBody = exceptOneLineClassBody && isLastInOneLinerClassBody(node); const oneLinerBlockOrClassBody = oneLinerBlock || oneLinerClassBody; if (isSemi && oneLinerBlockOrClassBody) { report(node, true); } else if (!isSemi && !oneLinerBlockOrClassBody) { report(node); } } } /** * Checks to see if there's a semicolon after a variable declaration. * @param {ASTNode} node The node to check. * @returns {void} */ function checkForSemicolonForVariableDeclaration(node) { const parent = node.parent; if ( (parent.type !== "ForStatement" || parent.init !== node) && (!/^For(?:In|Of)Statement/u.test(parent.type) || parent.left !== node) ) { checkForSemicolon(node); } } //-------------------------------------------------------------------------- // Public API //-------------------------------------------------------------------------- return { VariableDeclaration: checkForSemicolonForVariableDeclaration, ExpressionStatement: checkForSemicolon, ReturnStatement: checkForSemicolon, ThrowStatement: checkForSemicolon, DoWhileStatement: checkForSemicolon, DebuggerStatement: checkForSemicolon, BreakStatement: checkForSemicolon, ContinueStatement: checkForSemicolon, ImportDeclaration: checkForSemicolon, ExportAllDeclaration: checkForSemicolon, ExportNamedDeclaration(node) { if (!node.declaration) { checkForSemicolon(node); } }, ExportDefaultDeclaration(node) { if ( !/(?:Class|Function)Declaration/u.test( node.declaration.type, ) ) { checkForSemicolon(node); } }, PropertyDefinition: checkForSemicolon, }; }, };
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