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drwxr-xr-x
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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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-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-case-declarations.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-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-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-imports.js
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no-restricted-modules.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-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-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-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-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-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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semi.js
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sort-imports.js
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strict.js
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symbol-description.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 : no-shadow.js
/** * @fileoverview Rule to flag on declaring variables already declared in the outer scope * @author Ilya Volodin */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const FUNC_EXPR_NODE_TYPES = new Set([ "ArrowFunctionExpression", "FunctionExpression", ]); const CALL_EXPR_NODE_TYPE = new Set(["CallExpression"]); const FOR_IN_OF_TYPE = /^For(?:In|Of)Statement$/u; const SENTINEL_TYPE = /^(?:(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression|CatchClause|ImportDeclaration|ExportNamedDeclaration)$/u; // TS-specific node types const TYPES_HOISTED_NODES = new Set([ "TSInterfaceDeclaration", "TSTypeAliasDeclaration", ]); // TS-specific function variable def types const ALLOWED_FUNCTION_VARIABLE_DEF_TYPES = new Set([ "TSCallSignatureDeclaration", "TSFunctionType", "TSMethodSignature", "TSEmptyBodyFunctionExpression", "TSDeclareFunction", "TSConstructSignatureDeclaration", "TSConstructorType", ]); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "suggestion", dialects: ["typescript", "javascript"], language: "javascript", defaultOptions: [ { allow: [], builtinGlobals: false, hoist: "functions", ignoreOnInitialization: false, ignoreTypeValueShadow: true, ignoreFunctionTypeParameterNameValueShadow: true, }, ], docs: { description: "Disallow variable declarations from shadowing variables declared in the outer scope", recommended: false, url: "https://eslint.org/docs/latest/rules/no-shadow", }, schema: [ { type: "object", properties: { builtinGlobals: { type: "boolean" }, hoist: { enum: [ "all", "functions", "never", "types", "functions-and-types", ], }, allow: { type: "array", items: { type: "string", }, }, ignoreOnInitialization: { type: "boolean" }, ignoreTypeValueShadow: { type: "boolean" }, ignoreFunctionTypeParameterNameValueShadow: { type: "boolean", }, }, additionalProperties: false, }, ], messages: { noShadow: "'{{name}}' is already declared in the upper scope on line {{shadowedLine}} column {{shadowedColumn}}.", noShadowGlobal: "'{{name}}' is already a global variable.", }, }, create(context) { const [ { builtinGlobals, hoist, allow, ignoreOnInitialization, ignoreTypeValueShadow, ignoreFunctionTypeParameterNameValueShadow, }, ] = context.options; const sourceCode = context.sourceCode; /** * Check if a scope is a TypeScript module augmenting the global namespace. * @param {Scope} scope The scope to check * @returns {boolean} Whether the scope is a global augmentation */ function isGlobalAugmentation(scope) { return ( scope.block.kind === "global" || (!!scope.upper && isGlobalAugmentation(scope.upper)) ); } /** * Check if variable is a `this` parameter. * @param {Object} variable The variable to check * @returns {boolean} Whether the variable is a this parameter */ function isThisParam(variable) { return variable.name === "this"; } /** * Checks if type and value shadows each other * @param {Object} variable The variable to check * @param {Object} shadowedVariable The shadowed variable * @returns {boolean} Whether it's a type/value shadow case to ignore */ function isTypeValueShadow(variable, shadowedVariable) { if (ignoreTypeValueShadow !== true) { return false; } if (!("isValueVariable" in variable)) { return false; } const firstDefinition = shadowedVariable.defs[0]; // Check if shadowedVariable is a type import const isTypeImport = firstDefinition && firstDefinition.parent?.type === "ImportDeclaration" && (firstDefinition.parent.importKind === "type" || firstDefinition.parent.specifiers.some( s => s.importKind === "type", )); const isShadowedValue = !firstDefinition || (isTypeImport ? false : shadowedVariable.isValueVariable); return variable.isValueVariable !== isShadowedValue; } /** * Checks if it's a function type parameter shadow * @param {Object} variable The variable to check * @returns {boolean} Whether it's a function type parameter shadow case to ignore */ function isFunctionTypeParameterNameValueShadow(variable) { if (ignoreFunctionTypeParameterNameValueShadow !== true) { return false; } return variable.defs.some(def => ALLOWED_FUNCTION_VARIABLE_DEF_TYPES.has(def.node.type), ); } /** * Checks if the variable is a generic of a static method * @param {Object} variable The variable to check * @returns {boolean} Whether the variable is a generic of a static method */ function isTypeParameterOfStaticMethod(variable) { const typeParameter = variable.identifiers[0].parent; const typeParameterDecl = typeParameter.parent; if (typeParameterDecl.type !== "TSTypeParameterDeclaration") { return false; } const functionExpr = typeParameterDecl.parent; const methodDefinition = functionExpr.parent; return methodDefinition.static; } /** * Checks for static method generic shadowing class generic * @param {Object} variable The variable to check * @returns {boolean} Whether it's a static method generic shadowing class generic */ function isGenericOfAStaticMethodShadow(variable) { return isTypeParameterOfStaticMethod(variable); } /** * Checks whether or not a given location is inside of the range of a given node. * @param {ASTNode} node An node to check. * @param {number} location A location to check. * @returns {boolean} `true` if the location is inside of the range of the node. */ function isInRange(node, location) { return ( node && node.range[0] <= location && location <= node.range[1] ); } /** * Searches from the current node through its ancestry to find a matching node. * @param {ASTNode} node a node to get. * @param {(node: ASTNode) => boolean} match a callback that checks whether or not the node verifies its condition or not. * @returns {ASTNode|null} the matching node. */ function findSelfOrAncestor(node, match) { let currentNode = node; while (currentNode && !match(currentNode)) { currentNode = currentNode.parent; } return currentNode; } /** * Finds function's outer scope. * @param {Scope} scope Function's own scope. * @returns {Scope} Function's outer scope. */ function getOuterScope(scope) { const upper = scope.upper; if (upper && upper.type === "function-expression-name") { return upper.upper; } return upper; } /** * Checks if a variable and a shadowedVariable have the same init pattern ancestor. * @param {Object} variable a variable to check. * @param {Object} shadowedVariable a shadowedVariable to check. * @returns {boolean} Whether or not the variable and the shadowedVariable have the same init pattern ancestor. */ function isInitPatternNode(variable, shadowedVariable) { const outerDef = shadowedVariable.defs[0]; if (!outerDef) { return false; } const { variableScope } = variable.scope; if ( !( FUNC_EXPR_NODE_TYPES.has(variableScope.block.type) && getOuterScope(variableScope) === shadowedVariable.scope ) ) { return false; } const fun = variableScope.block; const { parent } = fun; const callExpression = findSelfOrAncestor(parent, node => CALL_EXPR_NODE_TYPE.has(node.type), ); if (!callExpression) { return false; } let node = outerDef.name; const location = callExpression.range[1]; while (node) { if (node.type === "VariableDeclarator") { if (isInRange(node.init, location)) { return true; } if ( FOR_IN_OF_TYPE.test(node.parent.parent.type) && isInRange(node.parent.parent.right, location) ) { return true; } break; } else if (node.type === "AssignmentPattern") { if (isInRange(node.right, location)) { return true; } } else if (SENTINEL_TYPE.test(node.type)) { break; } node = node.parent; } return false; } /** * Check if variable name is allowed. * @param {ASTNode} variable The variable to check. * @returns {boolean} Whether or not the variable name is allowed. */ function isAllowed(variable) { return allow.includes(variable.name); } /** * Checks if a variable of the class name in the class scope of ClassDeclaration. * * ClassDeclaration creates two variables of its name into its outer scope and its class scope. * So we should ignore the variable in the class scope. * @param {Object} variable The variable to check. * @returns {boolean} Whether or not the variable of the class name in the class scope of ClassDeclaration. */ function isDuplicatedClassNameVariable(variable) { const block = variable.scope.block; return ( block.type === "ClassDeclaration" && block.id === variable.identifiers[0] ); } /** * Checks if a variable is inside the initializer of scopeVar. * * To avoid reporting at declarations such as `var a = function a() {};`. * But it should report `var a = function(a) {};` or `var a = function() { function a() {} };`. * @param {Object} variable The variable to check. * @param {Object} scopeVar The scope variable to look for. * @returns {boolean} Whether or not the variable is inside initializer of scopeVar. */ function isOnInitializer(variable, scopeVar) { const outerScope = scopeVar.scope; const outerDef = scopeVar.defs[0]; const outer = outerDef && outerDef.parent && outerDef.parent.range; const innerScope = variable.scope; const innerDef = variable.defs[0]; const inner = innerDef && innerDef.name.range; return ( outer && inner && outer[0] < inner[0] && inner[1] < outer[1] && ((innerDef.type === "FunctionName" && innerDef.node.type === "FunctionExpression") || innerDef.node.type === "ClassExpression") && outerScope === innerScope.upper ); } /** * Get a range of a variable's identifier node. * @param {Object} variable The variable to get. * @returns {Array|undefined} The range of the variable's identifier node. */ function getNameRange(variable) { const def = variable.defs[0]; return def && def.name.range; } /** * Get declared line and column of a variable. * @param {eslint-scope.Variable} variable The variable to get. * @returns {Object} The declared line and column of the variable. */ function getDeclaredLocation(variable) { const identifier = variable.identifiers[0]; let obj; if (identifier) { obj = { global: false, line: identifier.loc.start.line, column: identifier.loc.start.column + 1, }; } else { obj = { global: true, }; } return obj; } /** * Checks if a variable is in TDZ of scopeVar. * @param {Object} variable The variable to check. * @param {Object} scopeVar The variable of TDZ. * @returns {boolean} Whether or not the variable is in TDZ of scopeVar. */ function isInTdz(variable, scopeVar) { const outerDef = scopeVar.defs[0]; const inner = getNameRange(variable); const outer = getNameRange(scopeVar); if (!outer || inner[1] >= outer[0]) { return false; } if (hoist === "types") { return !TYPES_HOISTED_NODES.has(outerDef.node.type); } if (hoist === "functions-and-types") { return ( outerDef.node.type !== "FunctionDeclaration" && !TYPES_HOISTED_NODES.has(outerDef.node.type) ); } return ( inner && outer && inner[1] < outer[0] && // Excepts FunctionDeclaration if is {"hoist":"function"}. (hoist !== "functions" || !outerDef || outerDef.node.type !== "FunctionDeclaration") ); } /** * Checks if the initialization of a variable has the declare modifier in a * definition file. * @param {Object} variable The variable to check * @returns {boolean} Whether the variable is declared in a definition file */ function isDeclareInDTSFile(variable) { const fileName = context.filename; if ( !fileName.endsWith(".d.ts") && !fileName.endsWith(".d.cts") && !fileName.endsWith(".d.mts") ) { return false; } return variable.defs.some( def => (def.type === "Variable" && def.parent.declare) || (def.type === "ClassName" && def.node.declare) || (def.type === "TSEnumName" && def.node.declare) || (def.type === "TSModuleName" && def.node.declare), ); } /** * Checks if a variable is a duplicate of an enum name in the enum scope * @param {Object} variable The variable to check * @returns {boolean} Whether it's a duplicate enum name variable */ function isDuplicatedEnumNameVariable(variable) { const block = variable.scope.block; return ( block.type === "TSEnumDeclaration" && block.id === variable.identifiers[0] ); } /** * Check if this is an external module declaration merging with a type import * @param {Scope} scope Current scope * @param {Object} variable Current variable * @param {Object} shadowedVariable Shadowed variable * @returns {boolean} Whether it's an external declaration merging */ function isExternalDeclarationMerging( scope, variable, shadowedVariable, ) { const firstDefinition = shadowedVariable.defs[0]; if (!firstDefinition || !firstDefinition.parent) { return false; } // Check if the shadowed variable is a type import const isTypeImport = firstDefinition.parent.type === "ImportDeclaration" && (firstDefinition.parent.importKind === "type" || firstDefinition.parent.specifiers?.some( s => s.type === "ImportSpecifier" && s.importKind === "type" && s.local.name === shadowedVariable.name, )); if (!isTypeImport) { return false; } // Check if the current variable is within a module declaration const moduleDecl = findSelfOrAncestor( variable.identifiers[0]?.parent, node => node.type === "TSModuleDeclaration", ); if (!moduleDecl) { return false; } /* * Module declaration merging should only happen within the same module * Check if the module name matches the import source */ const importSource = firstDefinition.parent.source.value; const moduleName = moduleDecl.id.type === "Literal" ? moduleDecl.id.value : moduleDecl.id.name; return importSource === moduleName; } /** * Checks the current context for shadowed variables. * @param {Scope} scope Fixme * @returns {void} */ function checkForShadows(scope) { // ignore global augmentation if (isGlobalAugmentation(scope)) { return; } const variables = scope.variables; for (let i = 0; i < variables.length; ++i) { const variable = variables[i]; // Skips "arguments" or variables of a class name in the class scope of ClassDeclaration. if ( variable.identifiers.length === 0 || isDuplicatedClassNameVariable(variable) || isDuplicatedEnumNameVariable(variable) || isAllowed(variable) || isDeclareInDTSFile(variable) || isThisParam(variable) ) { continue; } // Gets shadowed variable. const shadowed = astUtils.getVariableByName( scope.upper, variable.name, ); if ( shadowed && (shadowed.identifiers.length > 0 || (builtinGlobals && "writeable" in shadowed)) && !isOnInitializer(variable, shadowed) && !( ignoreOnInitialization && isInitPatternNode(variable, shadowed) ) && !(hoist !== "all" && isInTdz(variable, shadowed)) && !isTypeValueShadow(variable, shadowed) && !isFunctionTypeParameterNameValueShadow(variable) && !isGenericOfAStaticMethodShadow(variable, shadowed) && !isExternalDeclarationMerging(scope, variable, shadowed) ) { const location = getDeclaredLocation(shadowed); const messageId = location.global ? "noShadowGlobal" : "noShadow"; const data = { name: variable.name }; if (!location.global) { data.shadowedLine = location.line; data.shadowedColumn = location.column; } context.report({ node: variable.identifiers[0], messageId, data, }); } } } return { "Program:exit"(node) { const globalScope = sourceCode.getScope(node); const stack = globalScope.childScopes.slice(); while (stack.length) { const scope = stack.pop(); stack.push(...scope.childScopes); checkForShadows(scope); } }, }; }, };
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