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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-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-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
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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
11.59
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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
10.81
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no-useless-rename.js
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no-useless-return.js
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no-var.js
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no-void.js
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no-warning-comments.js
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no-with.js
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nonblock-statement-body-positi...
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object-curly-newline.js
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object-curly-spacing.js
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object-property-newline.js
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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-in-parens.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 : no-use-before-define.js
/** * @fileoverview Rule to flag use of variables before they are defined * @author Ilya Volodin */ "use strict"; //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const SENTINEL_TYPE = /^(?:(?:Function|Class)(?:Declaration|Expression)|ArrowFunctionExpression|CatchClause|ImportDeclaration|ExportNamedDeclaration)$/u; const FOR_IN_OF_TYPE = /^For(?:In|Of)Statement$/u; /** * Parses a given value as options. * @param {any} options A value to parse. * @returns {Object} The parsed options. */ function parseOptions(options) { if (typeof options === "object" && options !== null) { return options; } const functions = typeof options === "string" ? options !== "nofunc" : true; return { functions, classes: true, variables: true, allowNamedExports: false, enums: true, typedefs: true, ignoreTypeReferences: true, }; } /** * 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]; } /** * Checks whether or not a given location is inside of the range of a class static initializer. * Static initializers are static blocks and initializers of static fields. * @param {ASTNode} node `ClassBody` node to check static initializers. * @param {number} location A location to check. * @returns {boolean} `true` if the location is inside of a class static initializer. */ function isInClassStaticInitializerRange(node, location) { return node.body.some( classMember => (classMember.type === "StaticBlock" && isInRange(classMember, location)) || (classMember.type === "PropertyDefinition" && classMember.static && classMember.value && isInRange(classMember.value, location)), ); } /** * Checks whether a given scope is the scope of a class static initializer. * Static initializers are static blocks and initializers of static fields. * @param {eslint-scope.Scope} scope A scope to check. * @returns {boolean} `true` if the scope is a class static initializer scope. */ function isClassStaticInitializerScope(scope) { if (scope.type === "class-static-block") { return true; } if (scope.type === "class-field-initializer") { // `scope.block` is PropertyDefinition#value node const propertyDefinition = scope.block.parent; return propertyDefinition.static; } return false; } /** * Checks whether a given reference is evaluated in an execution context * that isn't the one where the variable it refers to is defined. * Execution contexts are: * - top-level * - functions * - class field initializers (implicit functions) * - class static blocks (implicit functions) * Static class field initializers and class static blocks are automatically run during the class definition evaluation, * and therefore we'll consider them as a part of the parent execution context. * Example: * * const x = 1; * * x; // returns `false` * () => x; // returns `true` * * class C { * field = x; // returns `true` * static field = x; // returns `false` * * method() { * x; // returns `true` * } * * static method() { * x; // returns `true` * } * * static { * x; // returns `false` * } * } * @param {eslint-scope.Reference} reference A reference to check. * @returns {boolean} `true` if the reference is from a separate execution context. */ function isFromSeparateExecutionContext(reference) { const variable = reference.resolved; let scope = reference.from; // Scope#variableScope represents execution context while (variable.scope.variableScope !== scope.variableScope) { if (isClassStaticInitializerScope(scope.variableScope)) { scope = scope.variableScope.upper; } else { return true; } } return false; } /** * Checks whether or not a given reference is evaluated during the initialization of its variable. * * This returns `true` in the following cases: * * var a = a * var [a = a] = list * var {a = a} = obj * for (var a in a) {} * for (var a of a) {} * var C = class { [C]; }; * var C = class { static foo = C; }; * var C = class { static { foo = C; } }; * class C extends C {} * class C extends (class { static foo = C; }) {} * class C { [C]; } * @param {Reference} reference A reference to check. * @returns {boolean} `true` if the reference is evaluated during the initialization. */ function isEvaluatedDuringInitialization(reference) { if (isFromSeparateExecutionContext(reference)) { /* * Even if the reference appears in the initializer, it isn't evaluated during the initialization. * For example, `const x = () => x;` is valid. */ return false; } const location = reference.identifier.range[1]; const definition = reference.resolved.defs[0]; if (definition.type === "ClassName") { // `ClassDeclaration` or `ClassExpression` const classDefinition = definition.node; return ( isInRange(classDefinition, location) && /* * Class binding is initialized before running static initializers. * For example, `class C { static foo = C; static { bar = C; } }` is valid. */ !isInClassStaticInitializerRange(classDefinition.body, location) ); } let node = definition.name.parent; 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 whether the reference contains a type query. * @param {ASTNode} node Identifier node to check. * @returns {boolean} true if reference contains type query. */ function referenceContainsTypeQuery(node) { switch (node.type) { case "TSTypeQuery": return true; case "TSQualifiedName": case "Identifier": return referenceContainsTypeQuery(node.parent); default: // if we find a different node, there's no chance that we're in a TSTypeQuery return false; } } /** * Decorators are transpiled such that the decorator is placed after the class declaration * So it is considered safe * @param {Variable} variable The variable to check. * @param {Reference} reference The reference to check. * @returns {boolean} `true` if the reference is in a class decorator. */ function isClassRefInClassDecorator(variable, reference) { if (variable.defs[0].type !== "ClassName") { return false; } if ( !variable.defs[0].node.decorators || variable.defs[0].node.decorators.length === 0 ) { return false; } for (const deco of variable.defs[0].node.decorators) { if ( reference.identifier.range[0] >= deco.range[0] && reference.identifier.range[1] <= deco.range[1] ) { return true; } } return false; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { dialects: ["javascript", "typescript"], language: "javascript", type: "problem", docs: { description: "Disallow the use of variables before they are defined", recommended: false, url: "https://eslint.org/docs/latest/rules/no-use-before-define", }, schema: [ { oneOf: [ { enum: ["nofunc"], }, { type: "object", properties: { functions: { type: "boolean" }, classes: { type: "boolean" }, variables: { type: "boolean" }, allowNamedExports: { type: "boolean" }, enums: { type: "boolean" }, typedefs: { type: "boolean" }, ignoreTypeReferences: { type: "boolean" }, }, additionalProperties: false, }, ], }, ], defaultOptions: [ { classes: true, functions: true, variables: true, allowNamedExports: false, enums: true, typedefs: true, ignoreTypeReferences: true, }, ], messages: { usedBeforeDefined: "'{{name}}' was used before it was defined.", }, }, create(context) { const options = parseOptions(context.options[0]); const sourceCode = context.sourceCode; /** * Determines whether a given reference should be checked. * * Returns `false` if the reference is: * - initialization's (e.g., `let a = 1`). * - referring to an undefined variable (i.e., if it's an unresolved reference). * - referring to a variable that is defined, but not in the given source code * (e.g., global environment variable or `arguments` in functions). * - allowed by options. * @param {eslint-scope.Reference} reference The reference * @returns {boolean} `true` if the reference should be checked */ function shouldCheck(reference) { if (reference.init) { return false; } const { identifier } = reference; if ( options.allowNamedExports && identifier.parent.type === "ExportSpecifier" && identifier.parent.local === identifier ) { return false; } const variable = reference.resolved; if (!variable || variable.defs.length === 0) { return false; } const definitionType = variable.defs[0].type; if (!options.functions && definitionType === "FunctionName") { return false; } if ( ((!options.variables && definitionType === "Variable") || (!options.classes && definitionType === "ClassName")) && // don't skip checking the reference if it's in the same execution context, because of TDZ isFromSeparateExecutionContext(reference) ) { return false; } if (!options.enums && definitionType === "TSEnumName") { return false; } if (!options.typedefs && definitionType === "Type") { return false; } if ( options.ignoreTypeReferences && (referenceContainsTypeQuery(identifier) || identifier.parent.type === "TSTypeReference") ) { return false; } // skip nested namespace aliases as variable references if (identifier.parent.type === "TSQualifiedName") { let currentNode = identifier.parent; while (currentNode.type === "TSQualifiedName") { currentNode = currentNode.left; } if (currentNode === identifier) { return true; } return false; } if (isClassRefInClassDecorator(variable, reference)) { return false; } return true; } /** * Finds and validates all references in a given scope and its child scopes. * @param {eslint-scope.Scope} scope The scope object. * @returns {void} */ function checkReferencesInScope(scope) { scope.references.filter(shouldCheck).forEach(reference => { const variable = reference.resolved; const definitionIdentifier = variable.defs[0].name; if ( reference.identifier.range[1] < definitionIdentifier.range[1] || (isEvaluatedDuringInitialization(reference) && reference.identifier.parent.type !== "TSTypeReference") ) { context.report({ node: reference.identifier, messageId: "usedBeforeDefined", data: reference.identifier, }); } }); scope.childScopes.forEach(checkReferencesInScope); } return { Program(node) { checkReferencesInScope(sourceCode.getScope(node)); }, }; }, };
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