Gecko [ c.stage.kornherr.net ]

Name	Size	Permission	Date
utils	[ DIR ]	drwxr-xr-x	2024-07-10 10:55
accessor-pairs.js	12.41 KB	-rw-r--r--	2019-09-14 01:35
array-bracket-newline.js	9.43 KB	-rw-r--r--	2019-09-14 01:35
array-bracket-spacing.js	8.85 KB	-rw-r--r--	2019-09-14 01:35
array-callback-return.js	7.98 KB	-rw-r--r--	2019-09-14 01:35
array-element-newline.js	9.22 KB	-rw-r--r--	2023-12-15 20:21
arrow-body-style.js	10.27 KB	-rw-r--r--	2019-09-14 01:35
arrow-parens.js	6.38 KB	-rw-r--r--	2019-09-14 01:35
arrow-spacing.js	5.08 KB	-rw-r--r--	2019-09-14 01:35
block-scoped-var.js	3.58 KB	-rw-r--r--	2019-09-14 01:35
block-spacing.js	4.99 KB	-rw-r--r--	2019-09-14 01:35
brace-style.js	7.71 KB	-rw-r--r--	2019-09-14 01:35
callback-return.js	6.33 KB	-rw-r--r--	2019-09-14 01:35
camelcase.js	8.29 KB	-rw-r--r--	2019-09-14 01:35
capitalized-comments.js	10.68 KB	-rw-r--r--	2023-12-15 20:21
class-methods-use-this.js	3.81 KB	-rw-r--r--	2019-09-14 01:35
comma-dangle.js	11.75 KB	-rw-r--r--	2019-09-14 01:35
comma-spacing.js	6.53 KB	-rw-r--r--	2019-09-14 01:35
comma-style.js	11.78 KB	-rw-r--r--	2019-09-14 01:35
complexity.js	4.94 KB	-rw-r--r--	2019-09-14 01:35
computed-property-spacing.js	7.17 KB	-rw-r--r--	2019-09-14 01:35
consistent-return.js	6.59 KB	-rw-r--r--	2019-09-14 01:35
consistent-this.js	4.86 KB	-rw-r--r--	2019-09-14 01:35
constructor-super.js	13.49 KB	-rw-r--r--	2019-09-14 01:35
curly.js	16.24 KB	-rw-r--r--	2019-09-14 01:35
default-case.js	2.76 KB	-rw-r--r--	2019-09-14 01:35
default-param-last.js	1.5 KB	-rw-r--r--	2019-09-14 01:35
dot-location.js	3.34 KB	-rw-r--r--	2019-09-14 01:35
dot-notation.js	6.47 KB	-rw-r--r--	2019-09-14 01:35
eol-last.js	3.79 KB	-rw-r--r--	2019-09-14 01:35
eqeqeq.js	5.55 KB	-rw-r--r--	2023-12-15 20:21
for-direction.js	4.27 KB	-rw-r--r--	2019-09-14 01:35
func-call-spacing.js	7.29 KB	-rw-r--r--	2019-09-14 01:35
func-name-matching.js	9.84 KB	-rw-r--r--	2023-12-15 20:21
func-names.js	6.09 KB	-rw-r--r--	2023-12-15 20:21
func-style.js	2.84 KB	-rw-r--r--	2019-09-14 01:35
function-call-argument-newline.js	4.13 KB	-rw-r--r--	2019-09-14 01:35
function-paren-newline.js	11.15 KB	-rw-r--r--	2019-09-14 01:35
generator-star-spacing.js	6.98 KB	-rw-r--r--	2019-09-14 01:35
getter-return.js	6.02 KB	-rw-r--r--	2019-09-14 01:35
global-require.js	2.3 KB	-rw-r--r--	2019-09-14 01:35
guard-for-in.js	2.3 KB	-rw-r--r--	2019-09-14 01:35
handle-callback-err.js	2.92 KB	-rw-r--r--	2019-09-14 01:35
id-blacklist.js	4.05 KB	-rw-r--r--	2019-09-14 01:35
id-length.js	4.12 KB	-rw-r--r--	2019-09-14 01:35
id-match.js	8.14 KB	-rw-r--r--	2019-09-14 01:35
implicit-arrow-linebreak.js	2.79 KB	-rw-r--r--	2019-09-14 01:35
indent-legacy.js	44.45 KB	-rw-r--r--	2019-09-14 01:35
indent.js	68.68 KB	-rw-r--r--	2019-09-14 01:35
index.js	16.34 KB	-rw-r--r--	2019-09-14 01:35
init-declarations.js	4.37 KB	-rw-r--r--	2019-09-14 01:35
jsx-quotes.js	2.89 KB	-rw-r--r--	2019-09-14 01:35
key-spacing.js	24.82 KB	-rw-r--r--	2019-09-14 01:35
keyword-spacing.js	21.2 KB	-rw-r--r--	2019-09-14 01:35
line-comment-position.js	4.08 KB	-rw-r--r--	2019-09-14 01:35
linebreak-style.js	3.17 KB	-rw-r--r--	2019-09-14 01:35
lines-around-comment.js	15.54 KB	-rw-r--r--	2019-09-14 01:35
lines-around-directive.js	7.58 KB	-rw-r--r--	2019-09-14 01:35
lines-between-class-members.js	5.05 KB	-rw-r--r--	2019-09-14 01:35
max-classes-per-file.js	1.73 KB	-rw-r--r--	2019-09-14 01:35
max-depth.js	4.59 KB	-rw-r--r--	2019-09-14 01:35
max-len.js	13.8 KB	-rw-r--r--	2019-09-14 01:35
max-lines-per-function.js	6.89 KB	-rw-r--r--	2019-09-14 01:35
max-lines.js	4.59 KB	-rw-r--r--	2019-09-14 01:35
max-nested-callbacks.js	3.47 KB	-rw-r--r--	2019-09-14 01:35
max-params.js	3.07 KB	-rw-r--r--	2019-09-14 01:35
max-statements-per-line.js	7.31 KB	-rw-r--r--	2019-09-14 01:35
max-statements.js	5.4 KB	-rw-r--r--	2019-09-14 01:35
multiline-comment-style.js	14.42 KB	-rw-r--r--	2019-09-14 01:35
multiline-ternary.js	3.42 KB	-rw-r--r--	2019-09-14 01:35
new-cap.js	9.44 KB	-rw-r--r--	2019-09-14 01:35
new-parens.js	3.14 KB	-rw-r--r--	2019-09-14 01:35
newline-after-var.js	9.6 KB	-rw-r--r--	2019-09-14 01:35
newline-before-return.js	7.89 KB	-rw-r--r--	2019-09-14 01:35
newline-per-chained-call.js	3.56 KB	-rw-r--r--	2019-09-14 01:35
no-alert.js	3.96 KB	-rw-r--r--	2019-09-14 01:35
no-array-constructor.js	1.36 KB	-rw-r--r--	2019-09-14 01:35
no-async-promise-executor.js	1.1 KB	-rw-r--r--	2019-09-14 01:35
no-await-in-loop.js	2.72 KB	-rw-r--r--	2019-09-14 01:35
no-bitwise.js	3.51 KB	-rw-r--r--	2019-09-14 01:35
no-buffer-constructor.js	1.31 KB	-rw-r--r--	2019-09-14 01:35
no-caller.js	1.17 KB	-rw-r--r--	2019-09-14 01:35
no-case-declarations.js	1.82 KB	-rw-r--r--	2019-09-14 01:35
no-catch-shadow.js	2.44 KB	-rw-r--r--	2019-09-14 01:35
no-class-assign.js	1.67 KB	-rw-r--r--	2019-09-14 01:35
no-compare-neg-zero.js	1.9 KB	-rw-r--r--	2019-09-14 01:35
no-cond-assign.js	5.04 KB	-rw-r--r--	2019-09-14 01:35
no-confusing-arrow.js	2.55 KB	-rw-r--r--	2019-09-14 01:35
no-console.js	4.21 KB	-rw-r--r--	2019-09-14 01:35
no-const-assign.js	1.46 KB	-rw-r--r--	2019-09-14 01:35
no-constant-condition.js	8.48 KB	-rw-r--r--	2019-09-14 01:35
no-continue.js	875 B	-rw-r--r--	2019-09-14 01:35
no-control-regex.js	3.14 KB	-rw-r--r--	2019-09-14 01:35
no-debugger.js	947 B	-rw-r--r--	2019-09-14 01:35
no-delete-var.js	965 B	-rw-r--r--	2019-09-14 01:35
no-div-regex.js	1.42 KB	-rw-r--r--	2019-09-14 01:35
no-dupe-args.js	2.3 KB	-rw-r--r--	2019-09-14 01:35
no-dupe-class-members.js	3.58 KB	-rw-r--r--	2019-09-14 01:35
no-dupe-keys.js	3.87 KB	-rw-r--r--	2019-09-14 01:35
no-duplicate-case.js	1.36 KB	-rw-r--r--	2019-09-14 01:35
no-duplicate-imports.js	4.43 KB	-rw-r--r--	2019-09-14 01:35
no-else-return.js	15.74 KB	-rw-r--r--	2019-09-14 01:35
no-empty-character-class.js	1.91 KB	-rw-r--r--	2019-09-14 01:35
no-empty-function.js	4.61 KB	-rw-r--r--	2019-09-14 01:35
no-empty-pattern.js	1.15 KB	-rw-r--r--	2019-09-14 01:35
no-empty.js	2.44 KB	-rw-r--r--	2019-09-14 01:35
no-eq-null.js	1.21 KB	-rw-r--r--	2019-09-14 01:35
no-eval.js	9.31 KB	-rw-r--r--	2019-09-14 01:35
no-ex-assign.js	1.37 KB	-rw-r--r--	2019-09-14 01:35
no-extend-native.js	6.95 KB	-rw-r--r--	2019-09-14 01:35
no-extra-bind.js	5.71 KB	-rw-r--r--	2019-09-14 01:35
no-extra-boolean-cast.js	6.52 KB	-rw-r--r--	2019-09-14 01:35
no-extra-label.js	4.76 KB	-rw-r--r--	2019-09-14 01:35
no-extra-parens.js	39.11 KB	-rw-r--r--	2019-09-14 01:35
no-extra-semi.js	4.11 KB	-rw-r--r--	2019-09-14 01:35
no-fallthrough.js	4.78 KB	-rw-r--r--	2019-09-14 01:35
no-floating-decimal.js	2.33 KB	-rw-r--r--	2019-09-14 01:35
no-func-assign.js	1.96 KB	-rw-r--r--	2019-09-14 01:35
no-global-assign.js	2.76 KB	-rw-r--r--	2019-09-14 01:35
no-implicit-coercion.js	10.06 KB	-rw-r--r--	2019-09-14 01:35
no-implicit-globals.js	1.78 KB	-rw-r--r--	2019-09-14 01:35
no-implied-eval.js	5.99 KB	-rw-r--r--	2019-09-14 01:35
no-import-assign.js	6.92 KB	-rw-r--r--	2019-09-14 01:35
no-inline-comments.js	2.19 KB	-rw-r--r--	2019-09-14 01:35
no-inner-declarations.js	2.59 KB	-rw-r--r--	2019-09-14 01:35
no-invalid-regexp.js	4.01 KB	-rw-r--r--	2019-09-14 01:35
no-invalid-this.js	3.74 KB	-rw-r--r--	2019-09-14 01:35
no-irregular-whitespace.js	8.72 KB	-rw-r--r--	2019-09-14 01:35
no-iterator.js	1.08 KB	-rw-r--r--	2019-09-14 01:35
no-label-var.js	2.13 KB	-rw-r--r--	2019-09-14 01:35
no-labels.js	4.22 KB	-rw-r--r--	2019-09-14 01:35
no-lone-blocks.js	3.68 KB	-rw-r--r--	2019-09-14 01:35
no-lonely-if.js	3.62 KB	-rw-r--r--	2019-09-14 01:35
no-loop-func.js	6.16 KB	-rw-r--r--	2019-09-14 01:35
no-magic-numbers.js	5.8 KB	-rw-r--r--	2019-09-14 01:35
no-misleading-character-class.js	6.05 KB	-rw-r--r--	2019-09-14 01:35
no-mixed-operators.js	8.21 KB	-rw-r--r--	2019-09-14 01:35
no-mixed-requires.js	6.91 KB	-rw-r--r--	2019-09-14 01:35
no-mixed-spaces-and-tabs.js	4.54 KB	-rw-r--r--	2019-09-14 01:35
no-multi-assign.js	1.18 KB	-rw-r--r--	2019-09-14 01:35
no-multi-spaces.js	4.85 KB	-rw-r--r--	2019-09-14 01:35
no-multi-str.js	1.64 KB	-rw-r--r--	2019-09-14 01:35
no-multiple-empty-lines.js	5.75 KB	-rw-r--r--	2019-09-14 01:35
no-native-reassign.js	2.86 KB	-rw-r--r--	2019-09-14 01:35
no-negated-condition.js	2.68 KB	-rw-r--r--	2019-09-14 01:35
no-negated-in-lhs.js	1.08 KB	-rw-r--r--	2019-09-14 01:35
no-nested-ternary.js	986 B	-rw-r--r--	2019-09-14 01:35
no-new-func.js	1.24 KB	-rw-r--r--	2019-09-14 01:35
no-new-object.js	923 B	-rw-r--r--	2019-09-14 01:35
no-new-require.js	960 B	-rw-r--r--	2019-09-14 01:35
no-new-symbol.js	1.27 KB	-rw-r--r--	2019-09-14 01:35
no-new-wrappers.js	1.05 KB	-rw-r--r--	2019-09-14 01:35
no-new.js	913 B	-rw-r--r--	2019-09-14 01:35
no-obj-calls.js	1.84 KB	-rw-r--r--	2019-09-14 01:35
no-octal-escape.js	1.42 KB	-rw-r--r--	2019-09-14 01:35
no-octal.js	886 B	-rw-r--r--	2019-09-14 01:35
no-param-reassign.js	6.8 KB	-rw-r--r--	2019-09-14 01:35
no-path-concat.js	1.44 KB	-rw-r--r--	2019-09-14 01:35
no-plusplus.js	1.66 KB	-rw-r--r--	2019-09-14 01:35
no-process-env.js	1.01 KB	-rw-r--r--	2019-09-14 01:35
no-process-exit.js	1.08 KB	-rw-r--r--	2019-09-14 01:35
no-proto.js	1.07 KB	-rw-r--r--	2019-09-14 01:35
no-prototype-builtins.js	1.63 KB	-rw-r--r--	2019-09-14 01:35
no-redeclare.js	5.6 KB	-rw-r--r--	2019-09-14 01:35
no-regex-spaces.js	3.73 KB	-rw-r--r--	2019-09-14 01:35
no-restricted-globals.js	3.76 KB	-rw-r--r--	2019-09-14 01:35
no-restricted-imports.js	11.43 KB	-rw-r--r--	2023-12-15 20:21
no-restricted-modules.js	5.9 KB	-rw-r--r--	2023-12-15 20:21
no-restricted-properties.js	6.46 KB	-rw-r--r--	2019-09-14 01:35
no-restricted-syntax.js	1.97 KB	-rw-r--r--	2019-09-14 01:35
no-return-assign.js	2.49 KB	-rw-r--r--	2019-09-14 01:35
no-return-await.js	3.73 KB	-rw-r--r--	2019-09-14 01:35
no-script-url.js	1.05 KB	-rw-r--r--	2019-09-14 01:35
no-self-assign.js	6.79 KB	-rw-r--r--	2019-09-14 01:35
no-self-compare.js	1.72 KB	-rw-r--r--	2019-09-14 01:35
no-sequences.js	3.94 KB	-rw-r--r--	2019-09-14 01:35
no-shadow-restricted-names.js	2 KB	-rw-r--r--	2019-09-14 01:35
no-shadow.js	6.81 KB	-rw-r--r--	2019-09-14 01:35
no-spaced-func.js	2.34 KB	-rw-r--r--	2019-09-14 01:35
no-sparse-arrays.js	1.07 KB	-rw-r--r--	2019-09-14 01:35
no-sync.js	1.52 KB	-rw-r--r--	2019-09-14 01:35
no-tabs.js	2.01 KB	-rw-r--r--	2019-09-14 01:35
no-template-curly-in-string.js	1.04 KB	-rw-r--r--	2019-09-14 01:35
no-ternary.js	793 B	-rw-r--r--	2019-09-14 01:35
no-this-before-super.js	9.95 KB	-rw-r--r--	2019-09-14 01:35
no-throw-literal.js	1.26 KB	-rw-r--r--	2019-09-14 01:35
no-trailing-spaces.js	6.13 KB	-rw-r--r--	2019-09-14 01:35
no-undef-init.js	2.01 KB	-rw-r--r--	2019-09-14 01:35
no-undef.js	2.24 KB	-rw-r--r--	2019-09-14 01:35
no-undefined.js	2.07 KB	-rw-r--r--	2019-09-14 01:35
no-underscore-dangle.js	7.44 KB	-rw-r--r--	2019-09-14 01:35
no-unexpected-multiline.js	3.59 KB	-rw-r--r--	2019-09-14 01:35
no-unmodified-loop-condition.js	11.65 KB	-rw-r--r--	2019-09-14 01:35
no-unneeded-ternary.js	6.58 KB	-rw-r--r--	2019-09-14 01:35
no-unreachable.js	6.29 KB	-rw-r--r--	2019-09-14 01:35
no-unsafe-finally.js	3.87 KB	-rw-r--r--	2019-09-14 01:35
no-unsafe-negation.js	2.36 KB	-rw-r--r--	2019-09-14 01:35
no-unused-expressions.js	4.7 KB	-rw-r--r--	2019-09-14 01:35
no-unused-labels.js	3.22 KB	-rw-r--r--	2019-09-14 01:35
no-unused-vars.js	23.08 KB	-rw-r--r--	2019-09-14 01:35
no-use-before-define.js	7.45 KB	-rw-r--r--	2019-09-14 01:35
no-useless-call.js	2.78 KB	-rw-r--r--	2019-09-14 01:35
no-useless-catch.js	1.55 KB	-rw-r--r--	2019-09-14 01:35
no-useless-computed-key.js	3.19 KB	-rw-r--r--	2019-09-14 01:35
no-useless-concat.js	3.16 KB	-rw-r--r--	2019-09-14 01:35
no-useless-constructor.js	5.46 KB	-rw-r--r--	2019-09-14 01:35
no-useless-escape.js	8.98 KB	-rw-r--r--	2019-09-14 01:35
no-useless-rename.js	5.08 KB	-rw-r--r--	2019-09-14 01:35
no-useless-return.js	11.77 KB	-rw-r--r--	2019-09-14 01:35
no-var.js	12.13 KB	-rw-r--r--	2019-09-14 01:35
no-void.js	1.03 KB	-rw-r--r--	2019-09-14 01:35
no-warning-comments.js	5.4 KB	-rw-r--r--	2019-09-14 01:35
no-whitespace-before-property.js	3.33 KB	-rw-r--r--	2019-09-14 01:35
no-with.js	784 B	-rw-r--r--	2019-09-14 01:35
nonblock-statement-body-position.js	4.41 KB	-rw-r--r--	2023-12-15 20:21
object-curly-newline.js	10.69 KB	-rw-r--r--	2019-09-14 01:35
object-curly-spacing.js	11.27 KB	-rw-r--r--	2019-09-14 01:35
object-property-newline.js	3.59 KB	-rw-r--r--	2019-09-14 01:35
object-shorthand.js	20.66 KB	-rw-r--r--	2019-09-14 01:35
one-var-declaration-per-line.js	2.74 KB	-rw-r--r--	2019-09-14 01:35
one-var.js	21 KB	-rw-r--r--	2019-09-14 01:35
operator-assignment.js	7.73 KB	-rw-r--r--	2019-09-14 01:35
operator-linebreak.js	10.01 KB	-rw-r--r--	2019-09-14 01:35
padded-blocks.js	10.05 KB	-rw-r--r--	2019-09-14 01:35
padding-line-between-statements.js	20 KB	-rw-r--r--	2023-12-15 20:21
prefer-arrow-callback.js	11.17 KB	-rw-r--r--	2019-09-14 01:35
prefer-const.js	16.69 KB	-rw-r--r--	2019-09-14 01:35
prefer-destructuring.js	9.7 KB	-rw-r--r--	2019-09-14 01:35
prefer-named-capture-group.js	3.94 KB	-rw-r--r--	2019-09-14 01:35
prefer-numeric-literals.js	3.73 KB	-rw-r--r--	2019-09-14 01:35
prefer-object-spread.js	9.05 KB	-rw-r--r--	2019-09-14 01:35
prefer-promise-reject-errors.js	5.41 KB	-rw-r--r--	2019-09-14 01:35
prefer-reflect.js	4.5 KB	-rw-r--r--	2019-09-14 01:35
prefer-regex-literals.js	4.4 KB	-rw-r--r--	2019-09-14 01:35
prefer-rest-params.js	3.22 KB	-rw-r--r--	2019-09-14 01:35
prefer-spread.js	2.77 KB	-rw-r--r--	2019-09-14 01:35
prefer-template.js	11.18 KB	-rw-r--r--	2019-09-14 01:35
quote-props.js	11.41 KB	-rw-r--r--	2019-09-14 01:35
quotes.js	11.48 KB	-rw-r--r--	2019-09-14 01:35
radix.js	5.16 KB	-rw-r--r--	2019-09-14 01:35
require-atomic-updates.js	9.51 KB	-rw-r--r--	2019-09-14 01:35
require-await.js	3.04 KB	-rw-r--r--	2019-09-14 01:35
require-jsdoc.js	3.65 KB	-rw-r--r--	2019-09-14 01:35
require-unicode-regexp.js	1.94 KB	-rw-r--r--	2019-09-14 01:35
require-yield.js	2.01 KB	-rw-r--r--	2019-09-14 01:35
rest-spread-spacing.js	3.93 KB	-rw-r--r--	2019-09-14 01:35
semi-spacing.js	7.62 KB	-rw-r--r--	2019-09-14 01:35
semi-style.js	4.98 KB	-rw-r--r--	2019-09-14 01:35
semi.js	11.56 KB	-rw-r--r--	2019-09-14 01:35
sort-imports.js	9.08 KB	-rw-r--r--	2019-09-14 01:35
sort-keys.js	7.64 KB	-rw-r--r--	2023-12-15 20:21
sort-vars.js	3.97 KB	-rw-r--r--	2019-09-14 01:35
space-before-blocks.js	5.59 KB	-rw-r--r--	2019-09-14 01:35
space-before-function-paren.js	5.56 KB	-rw-r--r--	2019-09-14 01:35
space-in-parens.js	10.41 KB	-rw-r--r--	2019-09-14 01:35
space-infix-ops.js	5.35 KB	-rw-r--r--	2019-09-14 01:35
space-unary-ops.js	12.3 KB	-rw-r--r--	2019-09-14 01:35
spaced-comment.js	12.27 KB	-rw-r--r--	2019-09-14 01:35
strict.js	10.31 KB	-rw-r--r--	2019-09-14 01:35
switch-colon-spacing.js	5.2 KB	-rw-r--r--	2019-09-14 01:35
symbol-description.js	1.98 KB	-rw-r--r--	2019-09-14 01:35
template-curly-spacing.js	4.06 KB	-rw-r--r--	2019-09-14 01:35
template-tag-spacing.js	2.79 KB	-rw-r--r--	2019-09-14 01:35
unicode-bom.js	2.15 KB	-rw-r--r--	2019-09-14 01:35
use-isnan.js	1.01 KB	-rw-r--r--	2019-09-14 01:35
valid-jsdoc.js	20.04 KB	-rw-r--r--	2019-09-14 01:35
valid-typeof.js	2.97 KB	-rw-r--r--	2019-09-14 01:35
vars-on-top.js	4.94 KB	-rw-r--r--	2019-09-14 01:35
wrap-iife.js	5.91 KB	-rw-r--r--	2019-09-14 01:35
wrap-regex.js	1.86 KB	-rw-r--r--	2019-09-14 01:35
yield-star-spacing.js	4.22 KB	-rw-r--r--	2019-09-14 01:35
yoda.js	11.41 KB	-rw-r--r--	2019-09-14 01:35

Rename

/**
 * @fileoverview A rule to suggest using arrow functions as callbacks.
 * @author Toru Nagashima
 */

"use strict";

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

/**
 * Checks whether or not a given variable is a function name.
 * @param {eslint-scope.Variable} variable - A variable to check.
 * @returns {boolean} `true` if the variable is a function name.
 */
function isFunctionName(variable) {
    return variable && variable.defs[0].type === "FunctionName";
}

/**
 * Checks whether or not a given MetaProperty node equals to a given value.
 * @param {ASTNode} node - A MetaProperty node to check.
 * @param {string} metaName - The name of `MetaProperty.meta`.
 * @param {string} propertyName - The name of `MetaProperty.property`.
 * @returns {boolean} `true` if the node is the specific value.
 */
function checkMetaProperty(node, metaName, propertyName) {
    return node.meta.name === metaName && node.property.name === propertyName;
}

/**
 * Gets the variable object of `arguments` which is defined implicitly.
 * @param {eslint-scope.Scope} scope - A scope to get.
 * @returns {eslint-scope.Variable} The found variable object.
 */
function getVariableOfArguments(scope) {
    const variables = scope.variables;

for (let i = 0; i < variables.length; ++i) {
        const variable = variables[i];

if (variable.name === "arguments") {

/*
             * If there was a parameter which is named "arguments", the
             * implicit "arguments" is not defined.
             * So does fast return with null.
             */
            return (variable.identifiers.length === 0) ? variable : null;
        }
    }

/* istanbul ignore next */
    return null;
}

/**
 * Checkes whether or not a given node is a callback.
 * @param {ASTNode} node - A node to check.
 * @returns {Object}
 *   {boolean} retv.isCallback - `true` if the node is a callback.
 *   {boolean} retv.isLexicalThis - `true` if the node is with `.bind(this)`.
 */
function getCallbackInfo(node) {
    const retv = { isCallback: false, isLexicalThis: false };
    let currentNode = node;
    let parent = node.parent;

while (currentNode) {
        switch (parent.type) {

// Checks parents recursively.

case "LogicalExpression":
            case "ConditionalExpression":
                break;

// Checks whether the parent node is `.bind(this)` call.
            case "MemberExpression":
                if (parent.object === currentNode &&
                    !parent.property.computed &&
                    parent.property.type === "Identifier" &&
                    parent.property.name === "bind" &&
                    parent.parent.type === "CallExpression" &&
                    parent.parent.callee === parent
                ) {
                    retv.isLexicalThis = (
                        parent.parent.arguments.length === 1 &&
                        parent.parent.arguments[0].type === "ThisExpression"
                    );
                    parent = parent.parent;
                } else {
                    return retv;
                }
                break;

// Checks whether the node is a callback.
            case "CallExpression":
            case "NewExpression":
                if (parent.callee !== currentNode) {
                    retv.isCallback = true;
                }
                return retv;

default:
                return retv;
        }

currentNode = parent;
        parent = parent.parent;
    }

/* istanbul ignore next */
    throw new Error("unreachable");
}

/**
 * Checks whether a simple list of parameters contains any duplicates. This does not handle complex
 * parameter lists (e.g. with destructuring), since complex parameter lists are a SyntaxError with duplicate
 * parameter names anyway. Instead, it always returns `false` for complex parameter lists.
 * @param {ASTNode[]} paramsList The list of parameters for a function
 * @returns {boolean} `true` if the list of parameters contains any duplicates
 */
function hasDuplicateParams(paramsList) {
    return paramsList.every(param => param.type === "Identifier") && paramsList.length !== new Set(paramsList.map(param => param.name)).size;
}

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = {
    meta: {
        type: "suggestion",

docs: {
            description: "require using arrow functions for callbacks",
            category: "ECMAScript 6",
            recommended: false,
            url: "https://eslint.org/docs/rules/prefer-arrow-callback"
        },

schema: [
            {
                type: "object",
                properties: {
                    allowNamedFunctions: {
                        type: "boolean",
                        default: false
                    },
                    allowUnboundThis: {
                        type: "boolean",
                        default: true
                    }
                },
                additionalProperties: false
            }
        ],

fixable: "code"
    },

create(context) {
        const options = context.options[0] || {};

const allowUnboundThis = options.allowUnboundThis !== false; // default to true
        const allowNamedFunctions = options.allowNamedFunctions;
        const sourceCode = context.getSourceCode();

/*
         * {Array<{this: boolean, super: boolean, meta: boolean}>}
         * - this - A flag which shows there are one or more ThisExpression.
         * - super - A flag which shows there are one or more Super.
         * - meta - A flag which shows there are one or more MethProperty.
         */
        let stack = [];

/**
         * Pushes new function scope with all `false` flags.
         * @returns {void}
         */
        function enterScope() {
            stack.push({ this: false, super: false, meta: false });
        }

/**
         * Pops a function scope from the stack.
         * @returns {{this: boolean, super: boolean, meta: boolean}} The information of the last scope.
         */
        function exitScope() {
            return stack.pop();
        }

return {

// Reset internal state.
            Program() {
                stack = [];
            },

// If there are below, it cannot replace with arrow functions merely.
            ThisExpression() {
                const info = stack[stack.length - 1];

if (info) {
                    info.this = true;
                }
            },

Super() {
                const info = stack[stack.length - 1];

if (info) {
                    info.super = true;
                }
            },

MetaProperty(node) {
                const info = stack[stack.length - 1];

if (info && checkMetaProperty(node, "new", "target")) {
                    info.meta = true;
                }
            },

// To skip nested scopes.
            FunctionDeclaration: enterScope,
            "FunctionDeclaration:exit": exitScope,

// Main.
            FunctionExpression: enterScope,
            "FunctionExpression:exit"(node) {
                const scopeInfo = exitScope();

// Skip named function expressions
                if (allowNamedFunctions && node.id && node.id.name) {
                    return;
                }

// Skip generators.
                if (node.generator) {
                    return;
                }

// Skip recursive functions.
                const nameVar = context.getDeclaredVariables(node)[0];

if (isFunctionName(nameVar) && nameVar.references.length > 0) {
                    return;
                }

// Skip if it's using arguments.
                const variable = getVariableOfArguments(context.getScope());

if (variable && variable.references.length > 0) {
                    return;
                }

// Reports if it's a callback which can replace with arrows.
                const callbackInfo = getCallbackInfo(node);

if (callbackInfo.isCallback &&
                    (!allowUnboundThis || !scopeInfo.this || callbackInfo.isLexicalThis) &&
                    !scopeInfo.super &&
                    !scopeInfo.meta
                ) {
                    context.report({
                        node,
                        message: "Unexpected function expression.",
                        fix(fixer) {
                            if ((!callbackInfo.isLexicalThis && scopeInfo.this) || hasDuplicateParams(node.params)) {

/*
                                 * If the callback function does not have .bind(this) and contains a reference to `this`, there
                                 * is no way to determine what `this` should be, so don't perform any fixes.
                                 * If the callback function has duplicates in its list of parameters (possible in sloppy mode),
                                 * don't replace it with an arrow function, because this is a SyntaxError with arrow functions.
                                 */
                                return null;
                            }

/*
                             * If the callback function has `.bind(this)`, replace it with an arrow function and remove the binding.
                             * Otherwise, just replace the arrow function itself.
                             */
                            const replacedNode = callbackInfo.isLexicalThis ? node.parent.parent : node;

/*
                             * If the replaced node is part of a BinaryExpression, LogicalExpression, or MemberExpression, then
                             * the arrow function needs to be parenthesized, because `foo || () => {}` is invalid syntax even
                             * though `foo || function() {}` is valid.
                             */
                            const needsParens = replacedNode.parent.type !== "CallExpression" && replacedNode.parent.type !== "ConditionalExpression";
                            const replacementText = needsParens ? `(${arrowFunctionText})` : arrowFunctionText;

return fixer.replaceText(replacedNode, replacementText);
                        }
                    });
                }
            }
        };
    }
};