FM / rules

/home/techb158/balavpn.abdallabala.com/node_modules/eslint/lib/rules/

/home/techb158/balavpn.abdallabala.com/node_modules/eslint/lib/rules

Name	Size	Mode	Actions
utils/	-	0777	rm
accessor-pairs.js	11210	0666	edit dl rm
array-bracket-newline.js	8123	0666	edit dl rm
array-bracket-spacing.js	8071	0666	edit dl rm
array-callback-return.js	12815	0666	edit dl rm
array-element-newline.js	9070	0666	edit dl rm
arrow-body-style.js	10365	0666	edit dl rm
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arrow-spacing.js	4618	0666	edit dl rm
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brace-style.js	7592	0666	edit dl rm
callback-return.js	5879	0666	edit dl rm
camelcase.js	10363	0666	edit dl rm
capitalized-comments.js	9285	0666	edit dl rm
class-methods-use-this.js	6393	0666	edit dl rm
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comma-spacing.js	5892	0666	edit dl rm
comma-style.js	10241	0666	edit dl rm
complexity.js	5194	0666	edit dl rm
computed-property-spacing.js	6703	0666	edit dl rm
consistent-return.js	5739	0666	edit dl rm
consistent-this.js	4429	0666	edit dl rm
constructor-super.js	12051	0666	edit dl rm
curly.js	11758	0666	edit dl rm
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func-style.js	5337	0666	edit dl rm
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function-paren-newline.js	10198	0666	edit dl rm
generator-star-spacing.js	6319	0666	edit dl rm
getter-return.js	5756	0666	edit dl rm
global-require.js	2853	0666	edit dl rm
grouped-accessor-pairs.js	7185	0666	edit dl rm
guard-for-in.js	1924	0666	edit dl rm
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id-blacklist.js	6700	0666	edit dl rm
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indent.js	66474	0666	edit dl rm
index.js	17913	0666	edit dl rm
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linebreak-style.js	3569	0666	edit dl rm
lines-around-comment.js	15497	0666	edit dl rm
lines-around-directive.js	7023	0666	edit dl rm
lines-between-class-members.js	10129	0666	edit dl rm
logical-assignment-operators.js	19047	0666	edit dl rm
max-classes-per-file.js	1858	0666	edit dl rm
max-depth.js	3633	0666	edit dl rm
max-len.js	13652	0666	edit dl rm
max-lines-per-function.js	6050	0666	edit dl rm
max-lines.js	4403	0666	edit dl rm
max-nested-callbacks.js	2691	0666	edit dl rm
max-params.js	3075	0666	edit dl rm
max-statements-per-line.js	6738	0666	edit dl rm
max-statements.js	4575	0666	edit dl rm
multiline-comment-style.js	18395	0666	edit dl rm
multiline-ternary.js	6541	0666	edit dl rm
new-cap.js	7204	0666	edit dl rm
new-parens.js	3167	0666	edit dl rm
newline-after-var.js	8852	0666	edit dl rm
newline-before-return.js	7126	0666	edit dl rm
newline-per-chained-call.js	3883	0666	edit dl rm
no-alert.js	3843	0666	edit dl rm
no-array-constructor.js	4995	0666	edit dl rm
no-async-promise-executor.js	1007	0666	edit dl rm
no-await-in-loop.js	2494	0666	edit dl rm
no-bitwise.js	2948	0666	edit dl rm
no-buffer-constructor.js	1868	0666	edit dl rm
no-caller.js	1086	0666	edit dl rm
no-case-declarations.js	1867	0666	edit dl rm
no-catch-shadow.js	2515	0666	edit dl rm
no-class-assign.js	1566	0666	edit dl rm
no-compare-neg-zero.js	1662	0666	edit dl rm
no-cond-assign.js	4837	0666	edit dl rm
no-confusing-arrow.js	3232	0666	edit dl rm
no-console.js	6233	0666	edit dl rm
no-const-assign.js	1848	0666	edit dl rm
no-constant-binary-expression.js	18150	0666	edit dl rm
no-constant-condition.js	4469	0666	edit dl rm
no-constructor-return.js	1191	0666	edit dl rm
no-continue.js	784	0666	edit dl rm
no-control-regex.js	3830	0666	edit dl rm
no-debugger.js	793	0666	edit dl rm
no-delete-var.js	852	0666	edit dl rm
no-div-regex.js	1245	0666	edit dl rm
no-dupe-args.js	2387	0666	edit dl rm
no-dupe-class-members.js	2905	0666	edit dl rm
no-dupe-else-if.js	4197	0666	edit dl rm
no-dupe-keys.js	3963	0666	edit dl rm
no-duplicate-case.js	1765	0666	edit dl rm
no-duplicate-imports.js	10024	0666	edit dl rm
no-else-return.js	13405	0666	edit dl rm
no-empty-character-class.js	1938	0666	edit dl rm
no-empty-function.js	5754	0666	edit dl rm
no-empty-pattern.js	1841	0666	edit dl rm
no-empty-static-block.js	1589	0666	edit dl rm
no-empty.js	3202	0666	edit dl rm
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no-floating-decimal.js	2568	0666	edit dl rm
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no-global-assign.js	2426	0666	edit dl rm
no-implicit-coercion.js	12600	0666	edit dl rm
no-implicit-globals.js	4626	0666	edit dl rm
no-implied-eval.js	4339	0666	edit dl rm
no-import-assign.js	6179	0666	edit dl rm
no-inline-comments.js	2691	0666	edit dl rm
no-inner-declarations.js	3221	0666	edit dl rm
no-invalid-regexp.js	5962	0666	edit dl rm
no-invalid-this.js	4488	0666	edit dl rm
no-irregular-whitespace.js	7853	0666	edit dl rm
no-iterator.js	1110	0666	edit dl rm
no-label-var.js	2063	0666	edit dl rm
no-labels.js	3365	0666	edit dl rm
no-lone-blocks.js	3320	0666	edit dl rm
no-lonely-if.js	3303	0666	edit dl rm
no-loop-func.js	7035	0666	edit dl rm
no-loss-of-precision.js	7393	0666	edit dl rm
no-magic-numbers.js	10580	0666	edit dl rm
no-misleading-character-class.js	16369	0666	edit dl rm
no-mixed-operators.js	7147	0666	edit dl rm
no-mixed-requires.js	6383	0666	edit dl rm
no-mixed-spaces-and-tabs.js	3465	0666	edit dl rm
no-multi-assign.js	1327	0666	edit dl rm
no-multi-spaces.js	4588	0666	edit dl rm
no-multi-str.js	1610	0666	edit dl rm
no-multiple-empty-lines.js	5581	0666	edit dl rm
no-native-reassign.js	2765	0666	edit dl rm
no-negated-condition.js	2431	0666	edit dl rm
no-negated-in-lhs.js	1338	0666	edit dl rm
no-nested-ternary.js	960	0666	edit dl rm
no-new-func.js	2393	0666	edit dl rm
no-new-native-nonconstructor.js	1754	0666	edit dl rm
no-new-object.js	1866	0666	edit dl rm
no-new-require.js	1588	0666	edit dl rm
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no-new-wrappers.js	1460	0666	edit dl rm
no-new.js	905	0666	edit dl rm
no-nonoctal-decimal-escape.js	4566	0666	edit dl rm
no-obj-calls.js	2466	0666	edit dl rm
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no-octal-escape.js	1175	0666	edit dl rm
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no-param-reassign.js	6363	0666	edit dl rm
no-path-concat.js	2012	0666	edit dl rm
no-plusplus.js	2672	0666	edit dl rm
no-process-env.js	1646	0666	edit dl rm
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no-proto.js	1093	0666	edit dl rm
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no-redeclare.js	4425	0666	edit dl rm
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no-restricted-exports.js	5636	0666	edit dl rm
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no-restricted-imports.js	23880	0666	edit dl rm
no-restricted-modules.js	6128	0666	edit dl rm
no-restricted-properties.js	5948	0666	edit dl rm
no-restricted-syntax.js	1698	0666	edit dl rm
no-return-assign.js	2259	0666	edit dl rm
no-return-await.js	4457	0666	edit dl rm
no-script-url.js	1512	0666	edit dl rm
no-self-assign.js	4666	0666	edit dl rm
no-self-compare.js	1705	0666	edit dl rm
no-sequences.js	4011	0666	edit dl rm
no-setter-return.js	5725	0666	edit dl rm
no-shadow-restricted-names.js	2672	0666	edit dl rm
no-shadow.js	17353	0666	edit dl rm
no-spaced-func.js	2603	0666	edit dl rm
no-sparse-arrays.js	1483	0666	edit dl rm
no-sync.js	1887	0666	edit dl rm
no-tabs.js	2449	0666	edit dl rm
no-template-curly-in-string.js	989	0666	edit dl rm
no-ternary.js	785	0666	edit dl rm
no-this-before-super.js	9043	0666	edit dl rm
no-throw-literal.js	1088	0666	edit dl rm
no-trailing-spaces.js	6110	0666	edit dl rm
no-unassigned-vars.js	1964	0666	edit dl rm
no-undef-init.js	2409	0666	edit dl rm
no-undef.js	1899	0666	edit dl rm
no-undefined.js	1861	0666	edit dl rm
no-underscore-dangle.js	9535	0666	edit dl rm
no-unexpected-multiline.js	3477	0666	edit dl rm
no-unmodified-loop-condition.js	10035	0666	edit dl rm
no-unneeded-ternary.js	5935	0666	edit dl rm
no-unreachable-loop.js	5076	0666	edit dl rm
no-unreachable.js	7498	0666	edit dl rm
no-unsafe-finally.js	3339	0666	edit dl rm
no-unsafe-negation.js	3972	0666	edit dl rm
no-unsafe-optional-chaining.js	5389	0666	edit dl rm
no-unused-expressions.js	5520	0666	edit dl rm
no-unused-labels.js	3878	0666	edit dl rm
no-unused-private-class-members.js	6277	0666	edit dl rm
no-unused-vars.js	48552	0666	edit dl rm
no-use-before-define.js	11866	0666	edit dl rm
no-useless-assignment.js	19334	0666	edit dl rm
no-useless-backreference.js	7662	0666	edit dl rm
no-useless-call.js	2779	0666	edit dl rm
no-useless-catch.js	1310	0666	edit dl rm
no-useless-computed-key.js	5936	0666	edit dl rm
no-useless-concat.js	2966	0666	edit dl rm
no-useless-constructor.js	6986	0666	edit dl rm
no-useless-escape.js	11065	0666	edit dl rm
no-useless-rename.js	4929	0666	edit dl rm
no-useless-return.js	11954	0666	edit dl rm
no-var.js	11461	0666	edit dl rm
no-void.js	1366	0666	edit dl rm
no-warning-comments.js	5670	0666	edit dl rm
no-whitespace-before-property.js	3883	0666	edit dl rm
no-with.js	757	0666	edit dl rm
nonblock-statement-body-position.js	4418	0666	edit dl rm
object-curly-newline.js	10115	0666	edit dl rm
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object-property-newline.js	3758	0666	edit dl rm
object-shorthand.js	18543	0666	edit dl rm
one-var-declaration-per-line.js	2995	0666	edit dl rm
one-var.js	19182	0666	edit dl rm
operator-assignment.js	7536	0666	edit dl rm
operator-linebreak.js	8901	0666	edit dl rm
padded-blocks.js	8910	0666	edit dl rm
padding-line-between-statements.js	16989	0666	edit dl rm
prefer-arrow-callback.js	11667	0666	edit dl rm
prefer-const.js	15780	0666	edit dl rm
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prefer-numeric-literals.js	4504	0666	edit dl rm
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sort-vars.js	3320	0666	edit dl rm
space-before-blocks.js	6328	0666	edit dl rm
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strict.js	9141	0666	edit dl rm
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template-curly-spacing.js	4337	0666	edit dl rm
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valid-typeof.js	4262	0666	edit dl rm
vars-on-top.js	4304	0666	edit dl rm
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yoda.js	9713	0666	edit dl rm

Edit: /home/techb158/balavpn.abdallabala.com/node_modules/eslint/lib/rules/no-useless-assignment.js (19334B)

/**
 * @fileoverview A rule to disallow unnecessary assignments`.
 * @author Yosuke Ota
 */

"use strict";

const { findVariable } = require("@eslint-community/eslint-utils");

//------------------------------------------------------------------------------
// Types
//------------------------------------------------------------------------------

/** @typedef {import("estree").Node} ASTNode */
/** @typedef {import("estree").Pattern} Pattern */
/** @typedef {import("estree").Identifier} Identifier */
/** @typedef {import("estree").VariableDeclarator} VariableDeclarator */
/** @typedef {import("estree").AssignmentExpression} AssignmentExpression */
/** @typedef {import("estree").UpdateExpression} UpdateExpression */
/** @typedef {import("estree").Expression} Expression */
/** @typedef {import("eslint-scope").Scope} Scope */
/** @typedef {import("eslint-scope").Variable} Variable */
/** @typedef {import("../linter/code-path-analysis/code-path")} CodePath */
/** @typedef {import("../linter/code-path-analysis/code-path-segment")} CodePathSegment */

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

/**
 * Extract identifier from the given pattern node used on the left-hand side of the assignment.
 * @param {Pattern} pattern The pattern node to extract identifier
 * @returns {Iterable<Identifier>} The extracted identifier
 */
function* extractIdentifiersFromPattern(pattern) {
	switch (pattern.type) {
		case "Identifier":
			yield pattern;
			return;
		case "ObjectPattern":
			for (const property of pattern.properties) {
				yield* extractIdentifiersFromPattern(
					property.type === "Property" ? property.value : property,
				);
			}
			return;
		case "ArrayPattern":
			for (const element of pattern.elements) {
				if (!element) {
					continue;
				}
				yield* extractIdentifiersFromPattern(element);
			}
			return;
		case "RestElement":
			yield* extractIdentifiersFromPattern(pattern.argument);
			return;
		case "AssignmentPattern":
			yield* extractIdentifiersFromPattern(pattern.left);

// no default
	}
}

/**
 * Checks whether the given identifier node is evaluated after the assignment identifier.
 * @param {AssignmentInfo} assignment The assignment info.
 * @param {Identifier} identifier The identifier to check.
 * @returns {boolean} `true` if the given identifier node is evaluated after the assignment identifier.
 */
function isIdentifierEvaluatedAfterAssignment(assignment, identifier) {
	if (identifier.range[0] < assignment.identifier.range[1]) {
		return false;
	}
	if (
		assignment.expression &&
		assignment.expression.range[0] <= identifier.range[0] &&
		identifier.range[1] <= assignment.expression.range[1]
	) {
		/*
		 * The identifier node is in an expression that is evaluated before the assignment.
		 * e.g. x = id;
		 *          ^^ identifier to check
		 *      ^      assignment identifier
		 */
		return false;
	}

/*
	 * e.g.
	 *      x = 42; id;
	 *              ^^ identifier to check
	 *      ^          assignment identifier
	 *      let { x, y = id } = obj;
	 *                   ^^  identifier to check
	 *            ^          assignment identifier
	 */
	return true;
}

/**
 * Checks whether the given identifier node is used between the assigned identifier and the equal sign.
 *
 * e.g. let { x, y = x } = obj;
 *                   ^   identifier to check
 *            ^          assigned identifier
 * @param {AssignmentInfo} assignment The assignment info.
 * @param {Identifier} identifier The identifier to check.
 * @returns {boolean} `true` if the given identifier node is used between the assigned identifier and the equal sign.
 */
function isIdentifierUsedBetweenAssignedAndEqualSign(assignment, identifier) {
	if (!assignment.expression) {
		return false;
	}
	return (
		assignment.identifier.range[1] <= identifier.range[0] &&
		identifier.range[1] <= assignment.expression.range[0]
	);
}

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

/** @type {import('../types').Rule.RuleModule} */
module.exports = {
	meta: {
		type: "problem",

docs: {
			description:
				"Disallow variable assignments when the value is not used",
			recommended: false,
			url: "https://eslint.org/docs/latest/rules/no-useless-assignment",
		},

schema: [],

messages: {
			unnecessaryAssignment:
				"This assigned value is not used in subsequent statements.",
		},
	},

create(context) {
		const sourceCode = context.sourceCode;

/**
		 * @typedef {Object} ScopeStack
		 * @property {CodePath} codePath The code path of this scope stack.
		 * @property {Scope} scope The scope of this scope stack.
		 * @property {ScopeStack} upper The upper scope stack.
		 * @property {Record<string, ScopeStackSegmentInfo>} segments The map of ScopeStackSegmentInfo.
		 * @property {Set<CodePathSegment>} currentSegments The current CodePathSegments.
		 * @property {Map<Variable, AssignmentInfo[]>} assignments The map of list of AssignmentInfo for each variable.
		 * @property {Array} tryStatementBlocks The array of TryStatement block nodes in this scope stack.
		 */
		/**
		 * @typedef {Object} ScopeStackSegmentInfo
		 * @property {CodePathSegment} segment The code path segment.
		 * @property {Identifier|null} first The first identifier that appears within the segment.
		 * @property {Identifier|null} last The last identifier that appears within the segment.
		 * `first` and `last` are used to determine whether an identifier exists within the segment position range.
		 * Since it is used as a range of segments, we should originally hold all nodes, not just identifiers,
		 * but since the only nodes to be judged are identifiers, it is sufficient to have a range of identifiers.
		 */
		/**
		 * @typedef {Object} AssignmentInfo
		 * @property {Variable} variable The variable that is assigned.
		 * @property {Identifier} identifier The identifier that is assigned.
		 * @property {VariableDeclarator|AssignmentExpression|UpdateExpression} node The node where the variable was updated.
		 * @property {Expression|null} expression The expression that is evaluated before the assignment.
		 * @property {CodePathSegment[]} segments The code path segments where the assignment was made.
		 */

/** @type {ScopeStack} */
		let scopeStack = null;

/** @type {Set<Scope>} */
		const codePathStartScopes = new Set();

/**
		 * Gets the scope of code path start from given scope
		 * @param {Scope} scope The initial scope
		 * @returns {Scope} The scope of code path start
		 * @throws {Error} Unexpected error
		 */
		function getCodePathStartScope(scope) {
			let target = scope;

while (target) {
				if (codePathStartScopes.has(target)) {
					return target;
				}
				target = target.upper;
			}

// Should be unreachable
			return null;
		}

/**
		 * Verify the given scope stack.
		 * @param {ScopeStack} target The scope stack to verify.
		 * @returns {void}
		 */
		function verify(target) {
			/**
			 * Checks whether the given identifier is used in the segment.
			 * @param {CodePathSegment} segment The code path segment.
			 * @param {Identifier} identifier The identifier to check.
			 * @returns {boolean} `true` if the identifier is used in the segment.
			 */
			function isIdentifierUsedInSegment(segment, identifier) {
				const segmentInfo = target.segments[segment.id];

return (
					segmentInfo.first &&
					segmentInfo.last &&
					segmentInfo.first.range[0] <= identifier.range[0] &&
					identifier.range[1] <= segmentInfo.last.range[1]
				);
			}

/**
			 * Verifies whether the given assignment info is an used assignment.
			 * Report if it is an unused assignment.
			 * @param {AssignmentInfo} targetAssignment The assignment info to verify.
			 * @param {AssignmentInfo[]} allAssignments The list of all assignment info for variables.
			 * @returns {void}
			 */
			function verifyAssignmentIsUsed(targetAssignment, allAssignments) {
				// Skip assignment if it is in a try block.
				const isAssignmentInTryBlock = target.tryStatementBlocks.some(
					tryBlock =>
						tryBlock.range[0] <=
							targetAssignment.identifier.range[0] &&
						targetAssignment.identifier.range[1] <=
							tryBlock.range[1],
				);

if (isAssignmentInTryBlock) {
					return;
				}

/**
				 * @typedef {Object} SubsequentSegmentData
				 * @property {CodePathSegment} segment The code path segment
				 * @property {AssignmentInfo} [assignment] The first occurrence of the assignment within the segment.
				 * There is no need to check if the variable is used after this assignment,
				 * as the value it was assigned will be used.
				 */

/**
				 * Information used in `getSubsequentSegments()`.
				 * To avoid unnecessary iterations, cache information that has already been iterated over,
				 * and if additional iterations are needed, start iterating from the retained position.
				 */
				const subsequentSegmentData = {
					/**
					 * Cache of subsequent segment information list that have already been iterated.
					 * @type {SubsequentSegmentData[]}
					 */
					results: [],

/**
					 * Subsequent segments that have already been iterated on. Used to avoid infinite loops.
					 * @type {Set<CodePathSegment>}
					 */
					subsequentSegments: new Set(),

/**
					 * Unexplored code path segment.
					 * If additional iterations are needed, consume this information and iterate.
					 * @type {CodePathSegment[]}
					 */
					queueSegments: targetAssignment.segments.flatMap(
						segment => segment.nextSegments,
					),
				};

/**
				 * Gets the subsequent segments from the segment of
				 * the assignment currently being validated (targetAssignment).
				 * @returns {Iterable<SubsequentSegmentData>} the subsequent segments
				 */
				function* getSubsequentSegments() {
					yield* subsequentSegmentData.results;

while (subsequentSegmentData.queueSegments.length > 0) {
						const nextSegment =
							subsequentSegmentData.queueSegments.shift();

if (
							subsequentSegmentData.subsequentSegments.has(
								nextSegment,
							)
						) {
							continue;
						}
						subsequentSegmentData.subsequentSegments.add(
							nextSegment,
						);

const assignmentInSegment = allAssignments.find(
							otherAssignment =>
								otherAssignment.segments.includes(
									nextSegment,
								) &&
								!isIdentifierUsedBetweenAssignedAndEqualSign(
									otherAssignment,
									targetAssignment.identifier,
								),
						);

if (!assignmentInSegment) {
							/*
							 * Stores the next segment to explore.
							 * If `assignmentInSegment` exists,
							 * we are guarding it because we don't need to explore the next segment.
							 */
							subsequentSegmentData.queueSegments.push(
								...nextSegment.nextSegments,
							);
						}

/** @type {SubsequentSegmentData} */
						const result = {
							segment: nextSegment,
							assignment: assignmentInSegment,
						};

subsequentSegmentData.results.push(result);
						yield result;
					}
				}

if (
					targetAssignment.variable.references.some(
						ref => ref.identifier.type !== "Identifier",
					)
				) {
					/**
					 * Skip checking for a variable that has at least one non-identifier reference.
					 * It's generated by plugins and cannot be handled reliably in the core rule.
					 */
					return;
				}

const readReferences =
					targetAssignment.variable.references.filter(reference =>
						reference.isRead(),
					);

if (!readReferences.length) {
					/*
					 * It is not just an unnecessary assignment, but an unnecessary (unused) variable
					 * and thus should not be reported by this rule because it is reported by `no-unused-vars`.
					 */
					return;
				}

/**
				 * Other assignment on the current segment and after current assignment.
				 */
				const otherAssignmentAfterTargetAssignment =
					allAssignments.find(assignment => {
						if (
							assignment === targetAssignment ||
							(assignment.segments.length &&
								assignment.segments.every(
									segment =>
										!targetAssignment.segments.includes(
											segment,
										),
								))
						) {
							return false;
						}
						if (
							isIdentifierEvaluatedAfterAssignment(
								targetAssignment,
								assignment.identifier,
							)
						) {
							return true;
						}
						if (
							assignment.expression &&
							assignment.expression.range[0] <=
								targetAssignment.identifier.range[0] &&
							targetAssignment.identifier.range[1] <=
								assignment.expression.range[1]
						) {
							/*
							 * The target assignment is in an expression that is evaluated before the assignment.
							 * e.g. x=(x=1);
							 *         ^^^ targetAssignment
							 *      ^^^^^^^ assignment
							 */
							return true;
						}

return false;
					});

for (const reference of readReferences) {
					/*
					 * If the scope of the reference is outside the current code path scope,
					 * we cannot track whether this assignment is not used.
					 * For example, it can also be called asynchronously.
					 */
					if (
						target.scope !== getCodePathStartScope(reference.from)
					) {
						return;
					}

// Checks if it is used in the same segment as the target assignment.
					if (
						isIdentifierEvaluatedAfterAssignment(
							targetAssignment,
							reference.identifier,
						) &&
						(isIdentifierUsedBetweenAssignedAndEqualSign(
							targetAssignment,
							reference.identifier,
						) ||
							targetAssignment.segments.some(segment =>
								isIdentifierUsedInSegment(
									segment,
									reference.identifier,
								),
							))
					) {
						if (
							otherAssignmentAfterTargetAssignment &&
							isIdentifierEvaluatedAfterAssignment(
								otherAssignmentAfterTargetAssignment,
								reference.identifier,
							)
						) {
							// There was another assignment before the reference. Therefore, it has not been used yet.
							continue;
						}

// Uses in statements after the written identifier.
						return;
					}

if (otherAssignmentAfterTargetAssignment) {
						/*
						 * The assignment was followed by another assignment in the same segment.
						 * Therefore, there is no need to check the next segment.
						 */
						continue;
					}

// Check subsequent segments.
					for (const subsequentSegment of getSubsequentSegments()) {
						if (
							isIdentifierUsedInSegment(
								subsequentSegment.segment,
								reference.identifier,
							)
						) {
							if (
								subsequentSegment.assignment &&
								isIdentifierEvaluatedAfterAssignment(
									subsequentSegment.assignment,
									reference.identifier,
								)
							) {
								// There was another assignment before the reference. Therefore, it has not been used yet.
								continue;
							}

// It is used
							return;
						}
					}
				}
				context.report({
					node: targetAssignment.identifier,
					messageId: "unnecessaryAssignment",
				});
			}

// Verify that each assignment in the code path is used.
			for (const assignments of target.assignments.values()) {
				assignments.sort(
					(a, b) => a.identifier.range[0] - b.identifier.range[0],
				);
				for (const assignment of assignments) {
					verifyAssignmentIsUsed(assignment, assignments);
				}
			}
		}

return {
			onCodePathStart(codePath, node) {
				const scope = sourceCode.getScope(node);

scopeStack = {
					upper: scopeStack,
					codePath,
					scope,
					segments: Object.create(null),
					currentSegments: new Set(),
					assignments: new Map(),
					tryStatementBlocks: [],
				};
				codePathStartScopes.add(scopeStack.scope);
			},
			onCodePathEnd() {
				verify(scopeStack);

scopeStack = scopeStack.upper;
			},
			onCodePathSegmentStart(segment) {
				const segmentInfo = { segment, first: null, last: null };

scopeStack.segments[segment.id] = segmentInfo;
				scopeStack.currentSegments.add(segment);
			},
			onCodePathSegmentEnd(segment) {
				scopeStack.currentSegments.delete(segment);
			},
			TryStatement(node) {
				scopeStack.tryStatementBlocks.push(node.block);
			},
			Identifier(node) {
				for (const segment of scopeStack.currentSegments) {
					const segmentInfo = scopeStack.segments[segment.id];

if (!segmentInfo.first) {
						segmentInfo.first = node;
					}
					segmentInfo.last = node;
				}
			},
			":matches(VariableDeclarator[init!=null], AssignmentExpression, UpdateExpression):exit"(
				node,
			) {
				if (scopeStack.currentSegments.size === 0) {
					// Ignore unreachable segments
					return;
				}

const assignments = scopeStack.assignments;

let pattern;
				let expression = null;

if (node.type === "VariableDeclarator") {
					pattern = node.id;
					expression = node.init;
				} else if (node.type === "AssignmentExpression") {
					pattern = node.left;
					expression = node.right;
				} else {
					// UpdateExpression
					pattern = node.argument;
				}

for (const identifier of extractIdentifiersFromPattern(
					pattern,
				)) {
					const scope = sourceCode.getScope(identifier);

/** @type {Variable} */
					const variable = findVariable(scope, identifier);

if (!variable) {
						continue;
					}

// We don't know where global variables are used.
					if (
						variable.scope.type === "global" &&
						variable.defs.length === 0
					) {
						continue;
					}

/*
					 * If the scope of the variable is outside the current code path scope,
					 * we cannot track whether this assignment is not used.
					 */
					if (
						scopeStack.scope !==
						getCodePathStartScope(variable.scope)
					) {
						continue;
					}

// Variables marked by `markVariableAsUsed()` or
					// exported by "exported" block comment.
					if (variable.eslintUsed) {
						continue;
					}

// Variables exported by ESM export syntax
					if (variable.scope.type === "module") {
						if (
							variable.defs.some(
								def =>
									(def.type === "Variable" &&
										def.parent.parent.type ===
											"ExportNamedDeclaration") ||
									(def.type === "FunctionName" &&
										(def.node.parent.type ===
											"ExportNamedDeclaration" ||
											def.node.parent.type ===
												"ExportDefaultDeclaration")) ||
									(def.type === "ClassName" &&
										(def.node.parent.type ===
											"ExportNamedDeclaration" ||
											def.node.parent.type ===
												"ExportDefaultDeclaration")),
							)
						) {
							continue;
						}
						if (
							variable.references.some(
								reference =>
									reference.identifier.parent.type ===
									"ExportSpecifier",
							)
						) {
							// It have `export { ... }` reference.
							continue;
						}
					}

let list = assignments.get(variable);

if (!list) {
						list = [];
						assignments.set(variable, list);
					}
					list.push({
						variable,
						identifier,
						node,
						expression,
						segments: [...scopeStack.currentSegments],
					});
				}
			},
		};
	},
};

cmd: