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Date
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utils
[ DIR ]
drwxr-xr-x
2024-07-10 10:55
accessor-pairs.js
12.41
KB
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2019-09-14 01:35
array-bracket-newline.js
9.43
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2019-09-14 01:35
array-bracket-spacing.js
8.85
KB
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2019-09-14 01:35
array-callback-return.js
7.98
KB
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2019-09-14 01:35
array-element-newline.js
9.22
KB
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2023-12-15 20:21
arrow-body-style.js
10.27
KB
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2019-09-14 01:35
arrow-parens.js
6.38
KB
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2019-09-14 01:35
arrow-spacing.js
5.08
KB
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2019-09-14 01:35
block-scoped-var.js
3.58
KB
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2019-09-14 01:35
block-spacing.js
4.99
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2019-09-14 01:35
brace-style.js
7.71
KB
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2019-09-14 01:35
callback-return.js
6.33
KB
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2019-09-14 01:35
camelcase.js
8.29
KB
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2019-09-14 01:35
capitalized-comments.js
10.68
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2023-12-15 20:21
class-methods-use-this.js
3.81
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2019-09-14 01:35
comma-dangle.js
11.75
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2019-09-14 01:35
comma-spacing.js
6.53
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2019-09-14 01:35
comma-style.js
11.78
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2019-09-14 01:35
complexity.js
4.94
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2019-09-14 01:35
computed-property-spacing.js
7.17
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2019-09-14 01:35
consistent-return.js
6.59
KB
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2019-09-14 01:35
consistent-this.js
4.86
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2019-09-14 01:35
constructor-super.js
13.49
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2019-09-14 01:35
curly.js
16.24
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2019-09-14 01:35
default-case.js
2.76
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2019-09-14 01:35
default-param-last.js
1.5
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2019-09-14 01:35
dot-location.js
3.34
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2019-09-14 01:35
dot-notation.js
6.47
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2019-09-14 01:35
eol-last.js
3.79
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2019-09-14 01:35
eqeqeq.js
5.55
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2023-12-15 20:21
for-direction.js
4.27
KB
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2019-09-14 01:35
func-call-spacing.js
7.29
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2019-09-14 01:35
func-name-matching.js
9.84
KB
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2023-12-15 20:21
func-names.js
6.09
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2023-12-15 20:21
func-style.js
2.84
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2019-09-14 01:35
function-call-argument-newline.js
4.13
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2019-09-14 01:35
function-paren-newline.js
11.15
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2019-09-14 01:35
generator-star-spacing.js
6.98
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2019-09-14 01:35
getter-return.js
6.02
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2019-09-14 01:35
global-require.js
2.3
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2019-09-14 01:35
guard-for-in.js
2.3
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2019-09-14 01:35
handle-callback-err.js
2.92
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2019-09-14 01:35
id-blacklist.js
4.05
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2019-09-14 01:35
id-length.js
4.12
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2019-09-14 01:35
id-match.js
8.14
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2019-09-14 01:35
implicit-arrow-linebreak.js
2.79
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2019-09-14 01:35
indent-legacy.js
44.45
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2019-09-14 01:35
indent.js
68.68
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2019-09-14 01:35
index.js
16.34
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2019-09-14 01:35
init-declarations.js
4.37
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2019-09-14 01:35
jsx-quotes.js
2.89
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2019-09-14 01:35
key-spacing.js
24.82
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2019-09-14 01:35
keyword-spacing.js
21.2
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2019-09-14 01:35
line-comment-position.js
4.08
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2019-09-14 01:35
linebreak-style.js
3.17
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2019-09-14 01:35
lines-around-comment.js
15.54
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2019-09-14 01:35
lines-around-directive.js
7.58
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2019-09-14 01:35
lines-between-class-members.js
5.05
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2019-09-14 01:35
max-classes-per-file.js
1.73
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2019-09-14 01:35
max-depth.js
4.59
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2019-09-14 01:35
max-len.js
13.8
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2019-09-14 01:35
max-lines-per-function.js
6.89
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2019-09-14 01:35
max-lines.js
4.59
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2019-09-14 01:35
max-nested-callbacks.js
3.47
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2019-09-14 01:35
max-params.js
3.07
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2019-09-14 01:35
max-statements-per-line.js
7.31
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2019-09-14 01:35
max-statements.js
5.4
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2019-09-14 01:35
multiline-comment-style.js
14.42
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2019-09-14 01:35
multiline-ternary.js
3.42
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2019-09-14 01:35
new-cap.js
9.44
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2019-09-14 01:35
new-parens.js
3.14
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2019-09-14 01:35
newline-after-var.js
9.6
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2019-09-14 01:35
newline-before-return.js
7.89
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2019-09-14 01:35
newline-per-chained-call.js
3.56
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2019-09-14 01:35
no-alert.js
3.96
KB
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2019-09-14 01:35
no-array-constructor.js
1.36
KB
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2019-09-14 01:35
no-async-promise-executor.js
1.1
KB
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2019-09-14 01:35
no-await-in-loop.js
2.72
KB
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2019-09-14 01:35
no-bitwise.js
3.51
KB
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2019-09-14 01:35
no-buffer-constructor.js
1.31
KB
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2019-09-14 01:35
no-caller.js
1.17
KB
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2019-09-14 01:35
no-case-declarations.js
1.82
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2019-09-14 01:35
no-catch-shadow.js
2.44
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2019-09-14 01:35
no-class-assign.js
1.67
KB
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2019-09-14 01:35
no-compare-neg-zero.js
1.9
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2019-09-14 01:35
no-cond-assign.js
5.04
KB
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2019-09-14 01:35
no-confusing-arrow.js
2.55
KB
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2019-09-14 01:35
no-console.js
4.21
KB
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2019-09-14 01:35
no-const-assign.js
1.46
KB
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2019-09-14 01:35
no-constant-condition.js
8.48
KB
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2019-09-14 01:35
no-continue.js
875
B
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2019-09-14 01:35
no-control-regex.js
3.14
KB
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2019-09-14 01:35
no-debugger.js
947
B
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2019-09-14 01:35
no-delete-var.js
965
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2019-09-14 01:35
no-div-regex.js
1.42
KB
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2019-09-14 01:35
no-dupe-args.js
2.3
KB
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2019-09-14 01:35
no-dupe-class-members.js
3.58
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2019-09-14 01:35
no-dupe-keys.js
3.87
KB
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2019-09-14 01:35
no-duplicate-case.js
1.36
KB
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2019-09-14 01:35
no-duplicate-imports.js
4.43
KB
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2019-09-14 01:35
no-else-return.js
15.74
KB
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2019-09-14 01:35
no-empty-character-class.js
1.91
KB
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2019-09-14 01:35
no-empty-function.js
4.61
KB
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2019-09-14 01:35
no-empty-pattern.js
1.15
KB
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2019-09-14 01:35
no-empty.js
2.44
KB
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2019-09-14 01:35
no-eq-null.js
1.21
KB
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2019-09-14 01:35
no-eval.js
9.31
KB
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2019-09-14 01:35
no-ex-assign.js
1.37
KB
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2019-09-14 01:35
no-extend-native.js
6.95
KB
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2019-09-14 01:35
no-extra-bind.js
5.71
KB
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2019-09-14 01:35
no-extra-boolean-cast.js
6.52
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2019-09-14 01:35
no-extra-label.js
4.76
KB
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2019-09-14 01:35
no-extra-parens.js
39.11
KB
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2019-09-14 01:35
no-extra-semi.js
4.11
KB
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2019-09-14 01:35
no-fallthrough.js
4.78
KB
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2019-09-14 01:35
no-floating-decimal.js
2.33
KB
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2019-09-14 01:35
no-func-assign.js
1.96
KB
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2019-09-14 01:35
no-global-assign.js
2.76
KB
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2019-09-14 01:35
no-implicit-coercion.js
10.06
KB
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2019-09-14 01:35
no-implicit-globals.js
1.78
KB
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2019-09-14 01:35
no-implied-eval.js
5.99
KB
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2019-09-14 01:35
no-import-assign.js
6.92
KB
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2019-09-14 01:35
no-inline-comments.js
2.19
KB
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2019-09-14 01:35
no-inner-declarations.js
2.59
KB
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2019-09-14 01:35
no-invalid-regexp.js
4.01
KB
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2019-09-14 01:35
no-invalid-this.js
3.74
KB
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2019-09-14 01:35
no-irregular-whitespace.js
8.72
KB
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2019-09-14 01:35
no-iterator.js
1.08
KB
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2019-09-14 01:35
no-label-var.js
2.13
KB
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2019-09-14 01:35
no-labels.js
4.22
KB
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2019-09-14 01:35
no-lone-blocks.js
3.68
KB
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2019-09-14 01:35
no-lonely-if.js
3.62
KB
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2019-09-14 01:35
no-loop-func.js
6.16
KB
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2019-09-14 01:35
no-magic-numbers.js
5.8
KB
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2019-09-14 01:35
no-misleading-character-class.js
6.05
KB
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2019-09-14 01:35
no-mixed-operators.js
8.21
KB
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2019-09-14 01:35
no-mixed-requires.js
6.91
KB
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2019-09-14 01:35
no-mixed-spaces-and-tabs.js
4.54
KB
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2019-09-14 01:35
no-multi-assign.js
1.18
KB
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2019-09-14 01:35
no-multi-spaces.js
4.85
KB
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2019-09-14 01:35
no-multi-str.js
1.64
KB
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2019-09-14 01:35
no-multiple-empty-lines.js
5.75
KB
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2019-09-14 01:35
no-native-reassign.js
2.86
KB
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2019-09-14 01:35
no-negated-condition.js
2.68
KB
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2019-09-14 01:35
no-negated-in-lhs.js
1.08
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2019-09-14 01:35
no-nested-ternary.js
986
B
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2019-09-14 01:35
no-new-func.js
1.24
KB
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2019-09-14 01:35
no-new-object.js
923
B
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2019-09-14 01:35
no-new-require.js
960
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2019-09-14 01:35
no-new-symbol.js
1.27
KB
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2019-09-14 01:35
no-new-wrappers.js
1.05
KB
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2019-09-14 01:35
no-new.js
913
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2019-09-14 01:35
no-obj-calls.js
1.84
KB
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2019-09-14 01:35
no-octal-escape.js
1.42
KB
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2019-09-14 01:35
no-octal.js
886
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2019-09-14 01:35
no-param-reassign.js
6.8
KB
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2019-09-14 01:35
no-path-concat.js
1.44
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2019-09-14 01:35
no-plusplus.js
1.66
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2019-09-14 01:35
no-process-env.js
1.01
KB
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2019-09-14 01:35
no-process-exit.js
1.08
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2019-09-14 01:35
no-proto.js
1.07
KB
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2019-09-14 01:35
no-prototype-builtins.js
1.63
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2019-09-14 01:35
no-redeclare.js
5.6
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2019-09-14 01:35
no-regex-spaces.js
3.73
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2019-09-14 01:35
no-restricted-globals.js
3.76
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2019-09-14 01:35
no-restricted-imports.js
11.43
KB
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2023-12-15 20:21
no-restricted-modules.js
5.9
KB
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2023-12-15 20:21
no-restricted-properties.js
6.46
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2019-09-14 01:35
no-restricted-syntax.js
1.97
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2019-09-14 01:35
no-return-assign.js
2.49
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2019-09-14 01:35
no-return-await.js
3.73
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2019-09-14 01:35
no-script-url.js
1.05
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2019-09-14 01:35
no-self-assign.js
6.79
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2019-09-14 01:35
no-self-compare.js
1.72
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2019-09-14 01:35
no-sequences.js
3.94
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2019-09-14 01:35
no-shadow-restricted-names.js
2
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2019-09-14 01:35
no-shadow.js
6.81
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2019-09-14 01:35
no-spaced-func.js
2.34
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2019-09-14 01:35
no-sparse-arrays.js
1.07
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2019-09-14 01:35
no-sync.js
1.52
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2019-09-14 01:35
no-tabs.js
2.01
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2019-09-14 01:35
no-template-curly-in-string.js
1.04
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2019-09-14 01:35
no-ternary.js
793
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2019-09-14 01:35
no-this-before-super.js
9.95
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2019-09-14 01:35
no-throw-literal.js
1.26
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2019-09-14 01:35
no-trailing-spaces.js
6.13
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2019-09-14 01:35
no-undef-init.js
2.01
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2019-09-14 01:35
no-undef.js
2.24
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2019-09-14 01:35
no-undefined.js
2.07
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2019-09-14 01:35
no-underscore-dangle.js
7.44
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2019-09-14 01:35
no-unexpected-multiline.js
3.59
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2019-09-14 01:35
no-unmodified-loop-condition.js
11.65
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2019-09-14 01:35
no-unneeded-ternary.js
6.58
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2019-09-14 01:35
no-unreachable.js
6.29
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2019-09-14 01:35
no-unsafe-finally.js
3.87
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2019-09-14 01:35
no-unsafe-negation.js
2.36
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2019-09-14 01:35
no-unused-expressions.js
4.7
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2019-09-14 01:35
no-unused-labels.js
3.22
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2019-09-14 01:35
no-unused-vars.js
23.08
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2019-09-14 01:35
no-use-before-define.js
7.45
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2019-09-14 01:35
no-useless-call.js
2.78
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2019-09-14 01:35
no-useless-catch.js
1.55
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2019-09-14 01:35
no-useless-computed-key.js
3.19
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2019-09-14 01:35
no-useless-concat.js
3.16
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2019-09-14 01:35
no-useless-constructor.js
5.46
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2019-09-14 01:35
no-useless-escape.js
8.98
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2019-09-14 01:35
no-useless-rename.js
5.08
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2019-09-14 01:35
no-useless-return.js
11.77
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2019-09-14 01:35
no-var.js
12.13
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2019-09-14 01:35
no-void.js
1.03
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2019-09-14 01:35
no-warning-comments.js
5.4
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2019-09-14 01:35
no-whitespace-before-property.js
3.33
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2019-09-14 01:35
no-with.js
784
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2019-09-14 01:35
nonblock-statement-body-position.js
4.41
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2023-12-15 20:21
object-curly-newline.js
10.69
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2019-09-14 01:35
object-curly-spacing.js
11.27
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2019-09-14 01:35
object-property-newline.js
3.59
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2019-09-14 01:35
object-shorthand.js
20.66
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2019-09-14 01:35
one-var-declaration-per-line.js
2.74
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2019-09-14 01:35
one-var.js
21
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2019-09-14 01:35
operator-assignment.js
7.73
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/** * @fileoverview Rule to check for the usage of var. * @author Jamund Ferguson */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Helpers //------------------------------------------------------------------------------ /** * Check whether a given variable is a global variable or not. * @param {eslint-scope.Variable} variable The variable to check. * @returns {boolean} `true` if the variable is a global variable. */ function isGlobal(variable) { return Boolean(variable.scope) && variable.scope.type === "global"; } /** * Finds the nearest function scope or global scope walking up the scope * hierarchy. * * @param {eslint-scope.Scope} scope - The scope to traverse. * @returns {eslint-scope.Scope} a function scope or global scope containing the given * scope. */ function getEnclosingFunctionScope(scope) { let currentScope = scope; while (currentScope.type !== "function" && currentScope.type !== "global") { currentScope = currentScope.upper; } return currentScope; } /** * Checks whether the given variable has any references from a more specific * function expression (i.e. a closure). * * @param {eslint-scope.Variable} variable - A variable to check. * @returns {boolean} `true` if the variable is used from a closure. */ function isReferencedInClosure(variable) { const enclosingFunctionScope = getEnclosingFunctionScope(variable.scope); return variable.references.some(reference => getEnclosingFunctionScope(reference.from) !== enclosingFunctionScope); } /** * Checks whether the given node is the assignee of a loop. * * @param {ASTNode} node - A VariableDeclaration node to check. * @returns {boolean} `true` if the declaration is assigned as part of loop * iteration. */ function isLoopAssignee(node) { return (node.parent.type === "ForOfStatement" || node.parent.type === "ForInStatement") && node === node.parent.left; } /** * Checks whether the given variable declaration is immediately initialized. * * @param {ASTNode} node - A VariableDeclaration node to check. * @returns {boolean} `true` if the declaration has an initializer. */ function isDeclarationInitialized(node) { return node.declarations.every(declarator => declarator.init !== null); } const SCOPE_NODE_TYPE = /^(?:Program|BlockStatement|SwitchStatement|ForStatement|ForInStatement|ForOfStatement)$/u; /** * Gets the scope node which directly contains a given node. * * @param {ASTNode} node - A node to get. This is a `VariableDeclaration` or * an `Identifier`. * @returns {ASTNode} A scope node. This is one of `Program`, `BlockStatement`, * `SwitchStatement`, `ForStatement`, `ForInStatement`, and * `ForOfStatement`. */ function getScopeNode(node) { for (let currentNode = node; currentNode; currentNode = currentNode.parent) { if (SCOPE_NODE_TYPE.test(currentNode.type)) { return currentNode; } } /* istanbul ignore next : unreachable */ return null; } /** * Checks whether a given variable is redeclared or not. * * @param {eslint-scope.Variable} variable - A variable to check. * @returns {boolean} `true` if the variable is redeclared. */ function isRedeclared(variable) { return variable.defs.length >= 2; } /** * Checks whether a given variable is used from outside of the specified scope. * * @param {ASTNode} scopeNode - A scope node to check. * @returns {Function} The predicate function which checks whether a given * variable is used from outside of the specified scope. */ function isUsedFromOutsideOf(scopeNode) { /** * Checks whether a given reference is inside of the specified scope or not. * * @param {eslint-scope.Reference} reference - A reference to check. * @returns {boolean} `true` if the reference is inside of the specified * scope. */ function isOutsideOfScope(reference) { const scope = scopeNode.range; const id = reference.identifier.range; return id[0] < scope[0] || id[1] > scope[1]; } return function(variable) { return variable.references.some(isOutsideOfScope); }; } /** * Creates the predicate function which checks whether a variable has their references in TDZ. * * The predicate function would return `true`: * * - if a reference is before the declarator. E.g. (var a = b, b = 1;)(var {a = b, b} = {};) * - if a reference is in the expression of their default value. E.g. (var {a = a} = {};) * - if a reference is in the expression of their initializer. E.g. (var a = a;) * * @param {ASTNode} node - The initializer node of VariableDeclarator. * @returns {Function} The predicate function. * @private */ function hasReferenceInTDZ(node) { const initStart = node.range[0]; const initEnd = node.range[1]; return variable => { const id = variable.defs[0].name; const idStart = id.range[0]; const defaultValue = (id.parent.type === "AssignmentPattern" ? id.parent.right : null); const defaultStart = defaultValue && defaultValue.range[0]; const defaultEnd = defaultValue && defaultValue.range[1]; return variable.references.some(reference => { const start = reference.identifier.range[0]; const end = reference.identifier.range[1]; return !reference.init && ( start < idStart || (defaultValue !== null && start >= defaultStart && end <= defaultEnd) || (start >= initStart && end <= initEnd) ); }); }; } /** * Checks whether a given variable has name that is allowed for 'var' declarations, * but disallowed for `let` declarations. * * @param {eslint-scope.Variable} variable The variable to check. * @returns {boolean} `true` if the variable has a disallowed name. */ function hasNameDisallowedForLetDeclarations(variable) { return variable.name === "let"; } //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ module.exports = { meta: { type: "suggestion", docs: { description: "require `let` or `const` instead of `var`", category: "ECMAScript 6", recommended: false, url: "https://eslint.org/docs/rules/no-var" }, schema: [], fixable: "code" }, create(context) { const sourceCode = context.getSourceCode(); /** * Checks whether the variables which are defined by the given declarator node have their references in TDZ. * * @param {ASTNode} declarator - The VariableDeclarator node to check. * @returns {boolean} `true` if one of the variables which are defined by the given declarator node have their references in TDZ. */ function hasSelfReferenceInTDZ(declarator) { if (!declarator.init) { return false; } const variables = context.getDeclaredVariables(declarator); return variables.some(hasReferenceInTDZ(declarator.init)); } /** * Checks whether it can fix a given variable declaration or not. * It cannot fix if the following cases: * * - A variable is a global variable. * - A variable is declared on a SwitchCase node. * - A variable is redeclared. * - A variable is used from outside the scope. * - A variable is used from a closure within a loop. * - A variable might be used before it is assigned within a loop. * - A variable might be used in TDZ. * - A variable is declared in statement position (e.g. a single-line `IfStatement`) * - A variable has name that is disallowed for `let` declarations. * * ## A variable is declared on a SwitchCase node. * * If this rule modifies 'var' declarations on a SwitchCase node, it * would generate the warnings of 'no-case-declarations' rule. And the * 'eslint:recommended' preset includes 'no-case-declarations' rule, so * this rule doesn't modify those declarations. * * ## A variable is redeclared. * * The language spec disallows redeclarations of `let` declarations. * Those variables would cause syntax errors. * * ## A variable is used from outside the scope. * * The language spec disallows accesses from outside of the scope for * `let` declarations. Those variables would cause reference errors. * * ## A variable is used from a closure within a loop. * * A `var` declaration within a loop shares the same variable instance * across all loop iterations, while a `let` declaration creates a new * instance for each iteration. This means if a variable in a loop is * referenced by any closure, changing it from `var` to `let` would * change the behavior in a way that is generally unsafe. * * ## A variable might be used before it is assigned within a loop. * * Within a loop, a `let` declaration without an initializer will be * initialized to null, while a `var` declaration will retain its value * from the previous iteration, so it is only safe to change `var` to * `let` if we can statically determine that the variable is always * assigned a value before its first access in the loop body. To keep * the implementation simple, we only convert `var` to `let` within * loops when the variable is a loop assignee or the declaration has an * initializer. * * @param {ASTNode} node - A variable declaration node to check. * @returns {boolean} `true` if it can fix the node. */ function canFix(node) { const variables = context.getDeclaredVariables(node); const scopeNode = getScopeNode(node); if (node.parent.type === "SwitchCase" || node.declarations.some(hasSelfReferenceInTDZ) || variables.some(isGlobal) || variables.some(isRedeclared) || variables.some(isUsedFromOutsideOf(scopeNode)) || variables.some(hasNameDisallowedForLetDeclarations) ) { return false; } if (astUtils.isInLoop(node)) { if (variables.some(isReferencedInClosure)) { return false; } if (!isLoopAssignee(node) && !isDeclarationInitialized(node)) { return false; } } if ( !isLoopAssignee(node) && !(node.parent.type === "ForStatement" && node.parent.init === node) && !astUtils.STATEMENT_LIST_PARENTS.has(node.parent.type) ) { // If the declaration is not in a block, e.g. `if (foo) var bar = 1;`, then it can't be fixed. return false; } return true; } /** * Reports a given variable declaration node. * * @param {ASTNode} node - A variable declaration node to report. * @returns {void} */ function report(node) { context.report({ node, message: "Unexpected var, use let or const instead.", fix(fixer) { const varToken = sourceCode.getFirstToken(node, { filter: t => t.value === "var" }); return canFix(node) ? fixer.replaceText(varToken, "let") : null; } }); } return { "VariableDeclaration:exit"(node) { if (node.kind === "var") { report(node); } } }; } };