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accessor-pairs.js
10.95
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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-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
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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
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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-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
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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
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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-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
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object-shorthand.js
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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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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-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 : constructor-super.js
/** * @fileoverview A rule to verify `super()` callings in constructor. * @author Toru Nagashima */ "use strict"; //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Checks whether or not a given node is a constructor. * @param {ASTNode} node A node to check. This node type is one of * `Program`, `FunctionDeclaration`, `FunctionExpression`, and * `ArrowFunctionExpression`. * @returns {boolean} `true` if the node is a constructor. */ function isConstructorFunction(node) { return ( node.type === "FunctionExpression" && node.parent.type === "MethodDefinition" && node.parent.kind === "constructor" ); } /** * Checks whether a given node can be a constructor or not. * @param {ASTNode} node A node to check. * @returns {boolean} `true` if the node can be a constructor. */ function isPossibleConstructor(node) { if (!node) { return false; } switch (node.type) { case "ClassExpression": case "FunctionExpression": case "ThisExpression": case "MemberExpression": case "CallExpression": case "NewExpression": case "ChainExpression": case "YieldExpression": case "TaggedTemplateExpression": case "MetaProperty": return true; case "Identifier": return node.name !== "undefined"; case "AssignmentExpression": if (["=", "&&="].includes(node.operator)) { return isPossibleConstructor(node.right); } if (["||=", "??="].includes(node.operator)) { return ( isPossibleConstructor(node.left) || isPossibleConstructor(node.right) ); } /** * All other assignment operators are mathematical assignment operators (arithmetic or bitwise). * An assignment expression with a mathematical operator can either evaluate to a primitive value, * or throw, depending on the operands. Thus, it cannot evaluate to a constructor function. */ return false; case "LogicalExpression": /* * If the && operator short-circuits, the left side was falsy and therefore not a constructor, and if * it doesn't short-circuit, it takes the value from the right side, so the right side must always be a * possible constructor. A future improvement could verify that the left side could be truthy by * excluding falsy literals. */ if (node.operator === "&&") { return isPossibleConstructor(node.right); } return ( isPossibleConstructor(node.left) || isPossibleConstructor(node.right) ); case "ConditionalExpression": return ( isPossibleConstructor(node.alternate) || isPossibleConstructor(node.consequent) ); case "SequenceExpression": { const lastExpression = node.expressions.at(-1); return isPossibleConstructor(lastExpression); } default: return false; } } /** * A class to store information about a code path segment. */ class SegmentInfo { /** * Indicates if super() is called in all code paths. * @type {boolean} */ calledInEveryPaths = false; /** * Indicates if super() is called in any code paths. * @type {boolean} */ calledInSomePaths = false; /** * The nodes which have been validated and don't need to be reconsidered. * @type {ASTNode[]} */ validNodes = []; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "problem", docs: { description: "Require `super()` calls in constructors", recommended: true, url: "https://eslint.org/docs/latest/rules/constructor-super", }, schema: [], messages: { missingSome: "Lacked a call of 'super()' in some code paths.", missingAll: "Expected to call 'super()'.", duplicate: "Unexpected duplicate 'super()'.", badSuper: "Unexpected 'super()' because 'super' is not a constructor.", }, }, create(context) { /* * {{hasExtends: boolean, scope: Scope, codePath: CodePath}[]} * Information for each constructor. * - upper: Information of the upper constructor. * - hasExtends: A flag which shows whether own class has a valid `extends` * part. * - scope: The scope of own class. * - codePath: The code path object of the constructor. */ let funcInfo = null; /** * @type {Record<string, SegmentInfo>} */ const segInfoMap = Object.create(null); /** * Gets the flag which shows `super()` is called in some paths. * @param {CodePathSegment} segment A code path segment to get. * @returns {boolean} The flag which shows `super()` is called in some paths */ function isCalledInSomePath(segment) { return ( segment.reachable && segInfoMap[segment.id].calledInSomePaths ); } /** * Determines if a segment has been seen in the traversal. * @param {CodePathSegment} segment A code path segment to check. * @returns {boolean} `true` if the segment has been seen. */ function hasSegmentBeenSeen(segment) { return !!segInfoMap[segment.id]; } /** * Gets the flag which shows `super()` is called in all paths. * @param {CodePathSegment} segment A code path segment to get. * @returns {boolean} The flag which shows `super()` is called in all paths. */ function isCalledInEveryPath(segment) { return ( segment.reachable && segInfoMap[segment.id].calledInEveryPaths ); } return { /** * Stacks a constructor information. * @param {CodePath} codePath A code path which was started. * @param {ASTNode} node The current node. * @returns {void} */ onCodePathStart(codePath, node) { if (isConstructorFunction(node)) { // Class > ClassBody > MethodDefinition > FunctionExpression const classNode = node.parent.parent.parent; const superClass = classNode.superClass; funcInfo = { upper: funcInfo, isConstructor: true, hasExtends: Boolean(superClass), superIsConstructor: isPossibleConstructor(superClass), codePath, currentSegments: new Set(), }; } else { funcInfo = { upper: funcInfo, isConstructor: false, hasExtends: false, superIsConstructor: false, codePath, currentSegments: new Set(), }; } }, /** * Pops a constructor information. * And reports if `super()` lacked. * @param {CodePath} codePath A code path which was ended. * @param {ASTNode} node The current node. * @returns {void} */ onCodePathEnd(codePath, node) { const hasExtends = funcInfo.hasExtends; // Pop. funcInfo = funcInfo.upper; if (!hasExtends) { return; } // Reports if `super()` lacked. const returnedSegments = codePath.returnedSegments; const calledInEveryPaths = returnedSegments.every(isCalledInEveryPath); const calledInSomePaths = returnedSegments.some(isCalledInSomePath); if (!calledInEveryPaths) { context.report({ messageId: calledInSomePaths ? "missingSome" : "missingAll", node: node.parent, }); } }, /** * Initialize information of a given code path segment. * @param {CodePathSegment} segment A code path segment to initialize. * @param {CodePathSegment} node Node that starts the segment. * @returns {void} */ onCodePathSegmentStart(segment, node) { funcInfo.currentSegments.add(segment); if (!(funcInfo.isConstructor && funcInfo.hasExtends)) { return; } // Initialize info. const info = (segInfoMap[segment.id] = new SegmentInfo()); const seenPrevSegments = segment.prevSegments.filter(hasSegmentBeenSeen); // When there are previous segments, aggregates these. if (seenPrevSegments.length > 0) { info.calledInSomePaths = seenPrevSegments.some(isCalledInSomePath); info.calledInEveryPaths = seenPrevSegments.every(isCalledInEveryPath); } /* * ForStatement > *.update segments are a special case as they are created in advance, * without seen previous segments. Since they logically don't affect `calledInEveryPaths` * calculations, and they can never be a lone previous segment of another one, we'll set * their `calledInEveryPaths` to `true` to effectively ignore them in those calculations. * . */ if ( node.parent && node.parent.type === "ForStatement" && node.parent.update === node ) { info.calledInEveryPaths = true; } }, onUnreachableCodePathSegmentStart(segment) { funcInfo.currentSegments.add(segment); }, onUnreachableCodePathSegmentEnd(segment) { funcInfo.currentSegments.delete(segment); }, onCodePathSegmentEnd(segment) { funcInfo.currentSegments.delete(segment); }, /** * Update information of the code path segment when a code path was * looped. * @param {CodePathSegment} fromSegment The code path segment of the * end of a loop. * @param {CodePathSegment} toSegment A code path segment of the head * of a loop. * @returns {void} */ onCodePathSegmentLoop(fromSegment, toSegment) { if (!(funcInfo.isConstructor && funcInfo.hasExtends)) { return; } funcInfo.codePath.traverseSegments( { first: toSegment, last: fromSegment }, (segment, controller) => { const info = segInfoMap[segment.id]; // skip segments after the loop if (!info) { controller.skip(); return; } const seenPrevSegments = segment.prevSegments.filter(hasSegmentBeenSeen); const calledInSomePreviousPaths = seenPrevSegments.some(isCalledInSomePath); const calledInEveryPreviousPaths = seenPrevSegments.every(isCalledInEveryPath); info.calledInSomePaths ||= calledInSomePreviousPaths; info.calledInEveryPaths ||= calledInEveryPreviousPaths; // If flags become true anew, reports the valid nodes. if (calledInSomePreviousPaths) { const nodes = info.validNodes; info.validNodes = []; for (let i = 0; i < nodes.length; ++i) { const node = nodes[i]; context.report({ messageId: "duplicate", node, }); } } }, ); }, /** * Checks for a call of `super()`. * @param {ASTNode} node A CallExpression node to check. * @returns {void} */ "CallExpression:exit"(node) { if (!(funcInfo.isConstructor && funcInfo.hasExtends)) { return; } // Skips except `super()`. if (node.callee.type !== "Super") { return; } // Reports if needed. const segments = funcInfo.currentSegments; let duplicate = false; let info = null; for (const segment of segments) { if (segment.reachable) { info = segInfoMap[segment.id]; duplicate = duplicate || info.calledInSomePaths; info.calledInSomePaths = info.calledInEveryPaths = true; } } if (info) { if (duplicate) { context.report({ messageId: "duplicate", node, }); } else if (!funcInfo.superIsConstructor) { context.report({ messageId: "badSuper", node, }); } else { info.validNodes.push(node); } } }, /** * Set the mark to the returned path as `super()` was called. * @param {ASTNode} node A ReturnStatement node to check. * @returns {void} */ ReturnStatement(node) { if (!(funcInfo.isConstructor && funcInfo.hasExtends)) { return; } // Skips if no argument. if (!node.argument) { return; } // Returning argument is a substitute of 'super()'. const segments = funcInfo.currentSegments; for (const segment of segments) { if (segment.reachable) { const info = segInfoMap[segment.id]; info.calledInSomePaths = info.calledInEveryPaths = true; } } }, }; }, };
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