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drwxr-xr-x
accessor-pairs.js
10.95
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array-bracket-newline.js
7.93
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array-bracket-spacing.js
7.88
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array-callback-return.js
12.6
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array-element-newline.js
8.86
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arrow-body-style.js
10.12
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arrow-parens.js
6.95
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arrow-spacing.js
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block-scoped-var.js
3.42
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block-spacing.js
5.04
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brace-style.js
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callback-return.js
5.74
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camelcase.js
10.12
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capitalized-comments.js
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class-methods-use-this.js
6.24
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comma-dangle.js
11.38
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comma-spacing.js
5.75
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comma-style.js
10
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complexity.js
4.89
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computed-property-spacing.js
6.55
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consistent-return.js
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consistent-this.js
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constructor-super.js
11.77
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curly.js
11.48
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default-case-last.js
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default-case.js
2.26
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default-param-last.js
1.65
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dot-location.js
3.32
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dot-notation.js
5.08
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eol-last.js
3.48
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eqeqeq.js
4.76
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for-direction.js
4.11
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func-call-spacing.js
8.1
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func-name-matching.js
8.63
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func-names.js
5.01
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func-style.js
5.21
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function-call-argument-newline...
4.12
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function-paren-newline.js
9.96
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generator-star-spacing.js
6.17
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getter-return.js
5.62
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global-require.js
2.78
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grouped-accessor-pairs.js
7.08
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guard-for-in.js
1.88
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handle-callback-err.js
3.17
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id-blacklist.js
6.54
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id-denylist.js
6.21
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id-length.js
5.48
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id-match.js
8.99
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implicit-arrow-linebreak.js
3.07
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indent-legacy.js
34.88
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indent.js
64.92
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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
3.49
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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
9.89
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logical-assignment-operators.j...
18.6
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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
6.96
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newline-per-chained-call.js
3.79
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no-alert.js
3.75
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no-array-constructor.js
4.88
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no-async-promise-executor.js
1007
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no-await-in-loop.js
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no-bitwise.js
2.88
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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
3.16
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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
852
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no-div-regex.js
1.22
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no-dupe-args.js
1.95
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no-dupe-class-members.js
2.82
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no-dupe-else-if.js
4.1
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no-dupe-keys.js
3.87
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no-duplicate-case.js
1.72
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no-duplicate-imports.js
9.79
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no-else-return.js
13.09
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no-empty-character-class.js
1.89
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no-empty-function.js
5.22
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no-empty-pattern.js
1.8
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no-empty-static-block.js
1007
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no-empty.js
2.39
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no-eq-null.js
1.09
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no-eval.js
7.34
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no-ex-assign.js
1.27
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no-extend-native.js
5.29
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no-extra-bind.js
5.87
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no-extra-boolean-cast.js
10.34
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no-extra-label.js
4.17
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no-extra-parens.js
42.57
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no-extra-semi.js
4.52
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no-fallthrough.js
6.8
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no-floating-decimal.js
2.51
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no-func-assign.js
1.82
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no-global-assign.js
2.37
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no-implicit-coercion.js
12.3
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no-implicit-globals.js
4.52
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no-implied-eval.js
4.24
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no-import-assign.js
6.03
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no-inline-comments.js
2.63
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no-inner-declarations.js
3.15
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no-invalid-regexp.js
5.82
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no-invalid-this.js
4.38
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no-irregular-whitespace.js
7.67
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no-iterator.js
1.08
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no-label-var.js
2.01
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no-labels.js
3.29
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no-lone-blocks.js
3.24
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no-lonely-if.js
3.23
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no-loop-func.js
6.87
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no-loss-of-precision.js
6.91
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no-magic-numbers.js
10.33
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no-misleading-character-class....
15.96
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no-mixed-operators.js
6.98
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no-mixed-requires.js
6.23
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no-mixed-spaces-and-tabs.js
3.3
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no-multi-assign.js
1.3
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no-multi-spaces.js
4.48
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no-multi-str.js
1.57
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no-multiple-empty-lines.js
5.45
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no-native-reassign.js
2.7
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no-negated-condition.js
2.37
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no-negated-in-lhs.js
1.3
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no-nested-ternary.js
960
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no-new-func.js
2.34
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no-new-native-nonconstructor.j...
1.71
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no-new-object.js
1.82
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no-new-require.js
1.55
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no-new-symbol.js
1.69
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no-new-wrappers.js
1.43
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no-new.js
905
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no-nonoctal-decimal-escape.js
4.46
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no-obj-calls.js
2.41
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no-object-constructor.js
2.85
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no-octal-escape.js
1.15
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no-octal.js
851
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no-param-reassign.js
6.21
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no-path-concat.js
1.96
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no-plusplus.js
2.61
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no-process-env.js
1.6
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no-process-exit.js
1.69
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no-promise-executor-return.js
6.52
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no-proto.js
1.07
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no-prototype-builtins.js
4.61
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no-redeclare.js
4.32
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no-regex-spaces.js
5.15
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no-restricted-exports.js
5.5
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no-restricted-globals.js
3.72
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no-restricted-imports.js
19.02
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no-restricted-modules.js
5.98
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no-restricted-properties.js
5.81
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no-restricted-syntax.js
1.66
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no-return-assign.js
2.21
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no-return-await.js
4.35
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no-script-url.js
1.48
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no-self-assign.js
4.56
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no-self-compare.js
1.67
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no-sequences.js
3.92
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no-setter-return.js
5.59
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no-shadow-restricted-names.js
2.61
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no-shadow.js
16.95
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no-spaced-func.js
2.54
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no-sparse-arrays.js
1.45
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no-sync.js
1.84
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no-tabs.js
2.39
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no-template-curly-in-string.js
989
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no-ternary.js
785
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no-this-before-super.js
8.83
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no-throw-literal.js
1.06
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no-trailing-spaces.js
5.91
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no-unassigned-vars.js
1.92
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no-undef-init.js
2.35
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no-undef.js
1.85
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no-undefined.js
1.82
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no-underscore-dangle.js
9.31
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no-unexpected-multiline.js
3.4
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no-unmodified-loop-condition.j...
9.8
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no-unneeded-ternary.js
5.8
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no-unreachable-loop.js
4.96
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no-unreachable.js
7.32
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no-unsafe-finally.js
3.26
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no-unsafe-negation.js
3.88
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no-unsafe-optional-chaining.js
5.26
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no-unused-expressions.js
5.39
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no-unused-labels.js
3.79
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no-unused-private-class-member...
6.13
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no-unused-vars.js
47.41
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no-use-before-define.js
11.59
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no-useless-assignment.js
18.88
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no-useless-backreference.js
7.48
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no-useless-call.js
2.71
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no-useless-catch.js
1.28
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no-useless-computed-key.js
5.8
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no-useless-concat.js
2.9
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no-useless-constructor.js
6.82
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no-useless-escape.js
10.81
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no-useless-rename.js
4.81
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no-useless-return.js
11.67
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no-var.js
11.19
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no-void.js
1.33
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no-warning-comments.js
5.54
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no-whitespace-before-property....
3.79
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no-with.js
757
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nonblock-statement-body-positi...
4.31
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object-curly-newline.js
9.88
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object-curly-spacing.js
10.16
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object-property-newline.js
3.67
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object-shorthand.js
17.59
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one-var-declaration-per-line.j...
2.92
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one-var.js
17.5
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operator-assignment.js
7.36
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operator-linebreak.js
8.69
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padded-blocks.js
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padding-line-between-statement...
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prefer-arrow-callback.js
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prefer-const.js
15.41
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prefer-destructuring.js
8.72
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prefer-exponentiation-operator...
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prefer-named-capture-group.js
4.93
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prefer-numeric-literals.js
4.4
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prefer-object-has-own.js
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prefer-object-spread.js
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prefer-promise-reject-errors.j...
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prefer-reflect.js
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prefer-regex-literals.js
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prefer-rest-params.js
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prefer-spread.js
2.5
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prefer-template.js
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quote-props.js
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quotes.js
10.68
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radix.js
5.42
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require-atomic-updates.js
9.08
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require-await.js
4.46
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require-unicode-regexp.js
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require-yield.js
1.68
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rest-spread-spacing.js
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semi-spacing.js
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semi-style.js
5.12
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semi.js
13.01
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sort-imports.js
8.4
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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
1.66
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template-curly-spacing.js
4.24
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template-tag-spacing.js
2.99
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unicode-bom.js
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use-isnan.js
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valid-typeof.js
4.16
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vars-on-top.js
4.2
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wrap-iife.js
6.75
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wrap-regex.js
2.12
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yield-star-spacing.js
3.9
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yoda.js
9.48
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Code Editor : prefer-const.js
/** * @fileoverview A rule to suggest using of const declaration for variables that are never reassigned after declared. * @author Toru Nagashima */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const FixTracker = require("./utils/fix-tracker"); const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ const PATTERN_TYPE = /^(?:.+?Pattern|RestElement|SpreadProperty|ExperimentalRestProperty|Property)$/u; const DECLARATION_HOST_TYPE = /^(?:Program|BlockStatement|StaticBlock|SwitchCase)$/u; const DESTRUCTURING_HOST_TYPE = /^(?:VariableDeclarator|AssignmentExpression)$/u; /** * Checks whether a given node is located at `ForStatement.init` or not. * @param {ASTNode} node A node to check. * @returns {boolean} `true` if the node is located at `ForStatement.init`. */ function isInitOfForStatement(node) { return node.parent.type === "ForStatement" && node.parent.init === node; } /** * Checks whether a given Identifier node becomes a VariableDeclaration or not. * @param {ASTNode} identifier An Identifier node to check. * @returns {boolean} `true` if the node can become a VariableDeclaration. */ function canBecomeVariableDeclaration(identifier) { let node = identifier.parent; while (PATTERN_TYPE.test(node.type)) { node = node.parent; } return ( node.type === "VariableDeclarator" || (node.type === "AssignmentExpression" && node.parent.type === "ExpressionStatement" && DECLARATION_HOST_TYPE.test(node.parent.parent.type)) ); } /** * Checks if an property or element is from outer scope or function parameters * in destructing pattern. * @param {string} name A variable name to be checked. * @param {eslint-scope.Scope} initScope A scope to start find. * @returns {boolean} Indicates if the variable is from outer scope or function parameters. */ function isOuterVariableInDestructing(name, initScope) { if ( initScope.through.some( ref => ref.resolved && ref.resolved.name === name, ) ) { return true; } const variable = astUtils.getVariableByName(initScope, name); if (variable !== null) { return variable.defs.some(def => def.type === "Parameter"); } return false; } /** * Gets the VariableDeclarator/AssignmentExpression node that a given reference * belongs to. * This is used to detect a mix of reassigned and never reassigned in a * destructuring. * @param {eslint-scope.Reference} reference A reference to get. * @returns {ASTNode|null} A VariableDeclarator/AssignmentExpression node or * null. */ function getDestructuringHost(reference) { if (!reference.isWrite()) { return null; } let node = reference.identifier.parent; while (PATTERN_TYPE.test(node.type)) { node = node.parent; } if (!DESTRUCTURING_HOST_TYPE.test(node.type)) { return null; } return node; } /** * Determines if a destructuring assignment node contains * any MemberExpression nodes. This is used to determine if a * variable that is only written once using destructuring can be * safely converted into a const declaration. * @param {ASTNode} node The ObjectPattern or ArrayPattern node to check. * @returns {boolean} True if the destructuring pattern contains * a MemberExpression, false if not. */ function hasMemberExpressionAssignment(node) { switch (node.type) { case "ObjectPattern": return node.properties.some(prop => { if (prop) { /* * Spread elements have an argument property while * others have a value property. Because different * parsers use different node types for spread elements, * we just check if there is an argument property. */ return hasMemberExpressionAssignment( prop.argument || prop.value, ); } return false; }); case "ArrayPattern": return node.elements.some(element => { if (element) { return hasMemberExpressionAssignment(element); } return false; }); case "AssignmentPattern": return hasMemberExpressionAssignment(node.left); case "MemberExpression": return true; // no default } return false; } /** * Gets an identifier node of a given variable. * * If the initialization exists or one or more reading references exist before * the first assignment, the identifier node is the node of the declaration. * Otherwise, the identifier node is the node of the first assignment. * * If the variable should not change to const, this function returns null. * - If the variable is reassigned. * - If the variable is never initialized nor assigned. * - If the variable is initialized in a different scope from the declaration. * - If the unique assignment of the variable cannot change to a declaration. * e.g. `if (a) b = 1` / `return (b = 1)` * - If the variable is declared in the global scope and `eslintUsed` is `true`. * `/*exported foo` directive comment makes such variables. This rule does not * warn such variables because this rule cannot distinguish whether the * exported variables are reassigned or not. * @param {eslint-scope.Variable} variable A variable to get. * @param {boolean} ignoreReadBeforeAssign * The value of `ignoreReadBeforeAssign` option. * @returns {ASTNode|null} * An Identifier node if the variable should change to const. * Otherwise, null. */ function getIdentifierIfShouldBeConst(variable, ignoreReadBeforeAssign) { if (variable.eslintUsed && variable.scope.type === "global") { return null; } // Finds the unique WriteReference. let writer = null; let isReadBeforeInit = false; const references = variable.references; for (let i = 0; i < references.length; ++i) { const reference = references[i]; if (reference.isWrite()) { const isReassigned = writer !== null && writer.identifier !== reference.identifier; if (isReassigned) { return null; } const destructuringHost = getDestructuringHost(reference); if ( destructuringHost !== null && destructuringHost.left !== void 0 ) { const leftNode = destructuringHost.left; let hasOuterVariables = false, hasNonIdentifiers = false; if (leftNode.type === "ObjectPattern") { const properties = leftNode.properties; hasOuterVariables = properties .filter(prop => prop.value) .map(prop => prop.value.name) .some(name => isOuterVariableInDestructing(name, variable.scope), ); hasNonIdentifiers = hasMemberExpressionAssignment(leftNode); } else if (leftNode.type === "ArrayPattern") { const elements = leftNode.elements; hasOuterVariables = elements .map(element => element && element.name) .some(name => isOuterVariableInDestructing(name, variable.scope), ); hasNonIdentifiers = hasMemberExpressionAssignment(leftNode); } if (hasOuterVariables || hasNonIdentifiers) { return null; } } writer = reference; } else if (reference.isRead() && writer === null) { if (ignoreReadBeforeAssign) { return null; } isReadBeforeInit = true; } } /* * If the assignment is from a different scope, ignore it. * If the assignment cannot change to a declaration, ignore it. */ const shouldBeConst = writer !== null && writer.from === variable.scope && canBecomeVariableDeclaration(writer.identifier); if (!shouldBeConst) { return null; } if (isReadBeforeInit) { return variable.defs[0].name; } return writer.identifier; } /** * Groups by the VariableDeclarator/AssignmentExpression node that each * reference of given variables belongs to. * This is used to detect a mix of reassigned and never reassigned in a * destructuring. * @param {eslint-scope.Variable[]} variables Variables to group by destructuring. * @param {boolean} ignoreReadBeforeAssign * The value of `ignoreReadBeforeAssign` option. * @returns {Map<ASTNode, ASTNode[]>} Grouped identifier nodes. */ function groupByDestructuring(variables, ignoreReadBeforeAssign) { const identifierMap = new Map(); for (let i = 0; i < variables.length; ++i) { const variable = variables[i]; const references = variable.references; const identifier = getIdentifierIfShouldBeConst( variable, ignoreReadBeforeAssign, ); let prevId = null; for (let j = 0; j < references.length; ++j) { const reference = references[j]; const id = reference.identifier; /* * Avoid counting a reference twice or more for default values of * destructuring. */ if (id === prevId) { continue; } prevId = id; // Add the identifier node into the destructuring group. const group = getDestructuringHost(reference); if (group) { if (identifierMap.has(group)) { identifierMap.get(group).push(identifier); } else { identifierMap.set(group, [identifier]); } } } } return identifierMap; } /** * Finds the nearest parent of node with a given type. * @param {ASTNode} node The node to search from. * @param {string} type The type field of the parent node. * @param {Function} shouldStop A predicate that returns true if the traversal should stop, and false otherwise. * @returns {ASTNode} The closest ancestor with the specified type; null if no such ancestor exists. */ function findUp(node, type, shouldStop) { if (!node || shouldStop(node)) { return null; } if (node.type === type) { return node; } return findUp(node.parent, type, shouldStop); } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../types').Rule.RuleModule} */ module.exports = { meta: { type: "suggestion", defaultOptions: [ { destructuring: "any", ignoreReadBeforeAssign: false, }, ], docs: { description: "Require `const` declarations for variables that are never reassigned after declared", recommended: false, url: "https://eslint.org/docs/latest/rules/prefer-const", }, fixable: "code", schema: [ { type: "object", properties: { destructuring: { enum: ["any", "all"] }, ignoreReadBeforeAssign: { type: "boolean" }, }, additionalProperties: false, }, ], messages: { useConst: "'{{name}}' is never reassigned. Use 'const' instead.", }, }, create(context) { const [{ destructuring, ignoreReadBeforeAssign }] = context.options; const shouldMatchAnyDestructuredVariable = destructuring !== "all"; const sourceCode = context.sourceCode; const variables = []; let reportCount = 0; let checkedId = null; let checkedName = ""; /** * Reports given identifier nodes if all of the nodes should be declared * as const. * * The argument 'nodes' is an array of Identifier nodes. * This node is the result of 'getIdentifierIfShouldBeConst()', so it's * nullable. In simple declaration or assignment cases, the length of * the array is 1. In destructuring cases, the length of the array can * be 2 or more. * @param {(eslint-scope.Reference|null)[]} nodes * References which are grouped by destructuring to report. * @returns {void} */ function checkGroup(nodes) { const nodesToReport = nodes.filter(Boolean); if ( nodes.length && (shouldMatchAnyDestructuredVariable || nodesToReport.length === nodes.length) ) { const varDeclParent = findUp( nodes[0], "VariableDeclaration", parentNode => parentNode.type.endsWith("Statement"), ); const isVarDecParentNull = varDeclParent === null; if ( !isVarDecParentNull && varDeclParent.declarations.length > 0 ) { const firstDeclaration = varDeclParent.declarations[0]; if (firstDeclaration.init) { const firstDecParent = firstDeclaration.init.parent; /* * First we check the declaration type and then depending on * if the type is a "VariableDeclarator" or its an "ObjectPattern" * we compare the name and id from the first identifier, if the names are different * we assign the new name, id and reset the count of reportCount and nodeCount in * order to check each block for the number of reported errors and base our fix * based on comparing nodes.length and nodesToReport.length. */ if (firstDecParent.type === "VariableDeclarator") { if (firstDecParent.id.name !== checkedName) { checkedName = firstDecParent.id.name; reportCount = 0; } if (firstDecParent.id.type === "ObjectPattern") { if (firstDecParent.init.name !== checkedName) { checkedName = firstDecParent.init.name; reportCount = 0; } } if (firstDecParent.id !== checkedId) { checkedId = firstDecParent.id; reportCount = 0; } } } } let shouldFix = varDeclParent && // Don't do a fix unless all variables in the declarations are initialized (or it's in a for-in or for-of loop) (varDeclParent.parent.type === "ForInStatement" || varDeclParent.parent.type === "ForOfStatement" || varDeclParent.declarations.every( declaration => declaration.init, )) && /* * If options.destructuring is "all", then this warning will not occur unless * every assignment in the destructuring should be const. In that case, it's safe * to apply the fix. */ nodesToReport.length === nodes.length; if ( !isVarDecParentNull && varDeclParent.declarations && varDeclParent.declarations.length !== 1 ) { if ( varDeclParent && varDeclParent.declarations && varDeclParent.declarations.length >= 1 ) { /* * Add nodesToReport.length to a count, then comparing the count to the length * of the declarations in the current block. */ reportCount += nodesToReport.length; let totalDeclarationsCount = 0; varDeclParent.declarations.forEach(declaration => { if (declaration.id.type === "ObjectPattern") { totalDeclarationsCount += declaration.id.properties.length; } else if (declaration.id.type === "ArrayPattern") { totalDeclarationsCount += declaration.id.elements.length; } else { totalDeclarationsCount += 1; } }); shouldFix = shouldFix && reportCount === totalDeclarationsCount; } } nodesToReport.forEach(node => { context.report({ node, messageId: "useConst", data: node, fix: shouldFix ? fixer => { const letKeywordToken = sourceCode.getFirstToken( varDeclParent, t => t.value === varDeclParent.kind, ); /** * Extend the replacement range to the whole declaration, * in order to prevent other fixes in the same pass * https://github.com/eslint/eslint/issues/13899 */ return new FixTracker(fixer, sourceCode) .retainRange(varDeclParent.range) .replaceTextRange( letKeywordToken.range, "const", ); } : null, }); }); } } return { "Program:exit"() { groupByDestructuring(variables, ignoreReadBeforeAssign).forEach( checkGroup, ); }, VariableDeclaration(node) { if (node.kind === "let" && !isInitOfForStatement(node)) { variables.push(...sourceCode.getDeclaredVariables(node)); } }, }; }, };
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