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accessor-pairs.js
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array-element-newline.js
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complexity.js
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no-duplicate-imports.js
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no-else-return.js
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no-empty-character-class.js
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no-empty-function.js
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no-empty.js
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no-eval.js
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no-extra-label.js
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no-extra-parens.js
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no-extra-semi.js
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no-implicit-coercion.js
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no-import-assign.js
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no-inline-comments.js
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no-irregular-whitespace.js
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Code Editor : semi.js
/** * @fileoverview Rule to flag missing semicolons. * @author Nicholas C. Zakas * @deprecated in ESLint v8.53.0 */ "use strict"; //------------------------------------------------------------------------------ // Requirements //------------------------------------------------------------------------------ const FixTracker = require("./utils/fix-tracker"); const astUtils = require("./utils/ast-utils"); //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { deprecated: true, replacedBy: [], type: "layout", docs: { description: "Require or disallow semicolons instead of ASI", recommended: false, url: "https://eslint.org/docs/latest/rules/semi" }, fixable: "code", schema: { anyOf: [ { type: "array", items: [ { enum: ["never"] }, { type: "object", properties: { beforeStatementContinuationChars: { enum: ["always", "any", "never"] } }, additionalProperties: false } ], minItems: 0, maxItems: 2 }, { type: "array", items: [ { enum: ["always"] }, { type: "object", properties: { omitLastInOneLineBlock: { type: "boolean" }, omitLastInOneLineClassBody: { type: "boolean" } }, additionalProperties: false } ], minItems: 0, maxItems: 2 } ] }, messages: { missingSemi: "Missing semicolon.", extraSemi: "Extra semicolon." } }, create(context) { const OPT_OUT_PATTERN = /^[-[(/+`]/u; // One of [(/+-` const unsafeClassFieldNames = new Set(["get", "set", "static"]); const unsafeClassFieldFollowers = new Set(["*", "in", "instanceof"]); const options = context.options[1]; const never = context.options[0] === "never"; const exceptOneLine = Boolean(options && options.omitLastInOneLineBlock); const exceptOneLineClassBody = Boolean(options && options.omitLastInOneLineClassBody); const beforeStatementContinuationChars = options && options.beforeStatementContinuationChars || "any"; const sourceCode = context.sourceCode; //-------------------------------------------------------------------------- // Helpers //-------------------------------------------------------------------------- /** * Reports a semicolon error with appropriate location and message. * @param {ASTNode} node The node with an extra or missing semicolon. * @param {boolean} missing True if the semicolon is missing. * @returns {void} */ function report(node, missing) { const lastToken = sourceCode.getLastToken(node); let messageId, fix, loc; if (!missing) { messageId = "missingSemi"; loc = { start: lastToken.loc.end, end: astUtils.getNextLocation(sourceCode, lastToken.loc.end) }; fix = function(fixer) { return fixer.insertTextAfter(lastToken, ";"); }; } else { messageId = "extraSemi"; loc = lastToken.loc; fix = function(fixer) { /* * Expand the replacement range to include the surrounding * tokens to avoid conflicting with no-extra-semi. * https://github.com/eslint/eslint/issues/7928 */ return new FixTracker(fixer, sourceCode) .retainSurroundingTokens(lastToken) .remove(lastToken); }; } context.report({ node, loc, messageId, fix }); } /** * Check whether a given semicolon token is redundant. * @param {Token} semiToken A semicolon token to check. * @returns {boolean} `true` if the next token is `;` or `}`. */ function isRedundantSemi(semiToken) { const nextToken = sourceCode.getTokenAfter(semiToken); return ( !nextToken || astUtils.isClosingBraceToken(nextToken) || astUtils.isSemicolonToken(nextToken) ); } /** * Check whether a given token is the closing brace of an arrow function. * @param {Token} lastToken A token to check. * @returns {boolean} `true` if the token is the closing brace of an arrow function. */ function isEndOfArrowBlock(lastToken) { if (!astUtils.isClosingBraceToken(lastToken)) { return false; } const node = sourceCode.getNodeByRangeIndex(lastToken.range[0]); return ( node.type === "BlockStatement" && node.parent.type === "ArrowFunctionExpression" ); } /** * Checks if a given PropertyDefinition node followed by a semicolon * can safely remove that semicolon. It is not to safe to remove if * the class field name is "get", "set", or "static", or if * followed by a generator method. * @param {ASTNode} node The node to check. * @returns {boolean} `true` if the node cannot have the semicolon * removed. */ function maybeClassFieldAsiHazard(node) { if (node.type !== "PropertyDefinition") { return false; } /* * Computed property names and non-identifiers are always safe * as they can be distinguished from keywords easily. */ const needsNameCheck = !node.computed && node.key.type === "Identifier"; /* * Certain names are problematic unless they also have a * a way to distinguish between keywords and property * names. */ if (needsNameCheck && unsafeClassFieldNames.has(node.key.name)) { /* * Special case: If the field name is `static`, * it is only valid if the field is marked as static, * so "static static" is okay but "static" is not. */ const isStaticStatic = node.static && node.key.name === "static"; /* * For other unsafe names, we only care if there is no * initializer. No initializer = hazard. */ if (!isStaticStatic && !node.value) { return true; } } const followingToken = sourceCode.getTokenAfter(node); return unsafeClassFieldFollowers.has(followingToken.value); } /** * Check whether a given node is on the same line with the next token. * @param {Node} node A statement node to check. * @returns {boolean} `true` if the node is on the same line with the next token. */ function isOnSameLineWithNextToken(node) { const prevToken = sourceCode.getLastToken(node, 1); const nextToken = sourceCode.getTokenAfter(node); return !!nextToken && astUtils.isTokenOnSameLine(prevToken, nextToken); } /** * Check whether a given node can connect the next line if the next line is unreliable. * @param {Node} node A statement node to check. * @returns {boolean} `true` if the node can connect the next line. */ function maybeAsiHazardAfter(node) { const t = node.type; if (t === "DoWhileStatement" || t === "BreakStatement" || t === "ContinueStatement" || t === "DebuggerStatement" || t === "ImportDeclaration" || t === "ExportAllDeclaration" ) { return false; } if (t === "ReturnStatement") { return Boolean(node.argument); } if (t === "ExportNamedDeclaration") { return Boolean(node.declaration); } if (isEndOfArrowBlock(sourceCode.getLastToken(node, 1))) { return false; } return true; } /** * Check whether a given token can connect the previous statement. * @param {Token} token A token to check. * @returns {boolean} `true` if the token is one of `[`, `(`, `/`, `+`, `-`, ```, `++`, and `--`. */ function maybeAsiHazardBefore(token) { return ( Boolean(token) && OPT_OUT_PATTERN.test(token.value) && token.value !== "++" && token.value !== "--" ); } /** * Check if the semicolon of a given node is unnecessary, only true if: * - next token is a valid statement divider (`;` or `}`). * - next token is on a new line and the node is not connectable to the new line. * @param {Node} node A statement node to check. * @returns {boolean} whether the semicolon is unnecessary. */ function canRemoveSemicolon(node) { if (isRedundantSemi(sourceCode.getLastToken(node))) { return true; // `;;` or `;}` } if (maybeClassFieldAsiHazard(node)) { return false; } if (isOnSameLineWithNextToken(node)) { return false; // One liner. } // continuation characters should not apply to class fields if ( node.type !== "PropertyDefinition" && beforeStatementContinuationChars === "never" && !maybeAsiHazardAfter(node) ) { return true; // ASI works. This statement doesn't connect to the next. } if (!maybeAsiHazardBefore(sourceCode.getTokenAfter(node))) { return true; // ASI works. The next token doesn't connect to this statement. } return false; } /** * Checks a node to see if it's the last item in a one-liner block. * Block is any `BlockStatement` or `StaticBlock` node. Block is a one-liner if its * braces (and consequently everything between them) are on the same line. * @param {ASTNode} node The node to check. * @returns {boolean} whether the node is the last item in a one-liner block. */ function isLastInOneLinerBlock(node) { const parent = node.parent; const nextToken = sourceCode.getTokenAfter(node); if (!nextToken || nextToken.value !== "}") { return false; } if (parent.type === "BlockStatement") { return parent.loc.start.line === parent.loc.end.line; } if (parent.type === "StaticBlock") { const openingBrace = sourceCode.getFirstToken(parent, { skip: 1 }); // skip the `static` token return openingBrace.loc.start.line === parent.loc.end.line; } return false; } /** * Checks a node to see if it's the last item in a one-liner `ClassBody` node. * ClassBody is a one-liner if its braces (and consequently everything between them) are on the same line. * @param {ASTNode} node The node to check. * @returns {boolean} whether the node is the last item in a one-liner ClassBody. */ function isLastInOneLinerClassBody(node) { const parent = node.parent; const nextToken = sourceCode.getTokenAfter(node); if (!nextToken || nextToken.value !== "}") { return false; } if (parent.type === "ClassBody") { return parent.loc.start.line === parent.loc.end.line; } return false; } /** * Checks a node to see if it's followed by a semicolon. * @param {ASTNode} node The node to check. * @returns {void} */ function checkForSemicolon(node) { const isSemi = astUtils.isSemicolonToken(sourceCode.getLastToken(node)); if (never) { if (isSemi && canRemoveSemicolon(node)) { report(node, true); } else if ( !isSemi && beforeStatementContinuationChars === "always" && node.type !== "PropertyDefinition" && maybeAsiHazardBefore(sourceCode.getTokenAfter(node)) ) { report(node); } } else { const oneLinerBlock = (exceptOneLine && isLastInOneLinerBlock(node)); const oneLinerClassBody = (exceptOneLineClassBody && isLastInOneLinerClassBody(node)); const oneLinerBlockOrClassBody = oneLinerBlock || oneLinerClassBody; if (isSemi && oneLinerBlockOrClassBody) { report(node, true); } else if (!isSemi && !oneLinerBlockOrClassBody) { report(node); } } } /** * Checks to see if there's a semicolon after a variable declaration. * @param {ASTNode} node The node to check. * @returns {void} */ function checkForSemicolonForVariableDeclaration(node) { const parent = node.parent; if ((parent.type !== "ForStatement" || parent.init !== node) && (!/^For(?:In|Of)Statement/u.test(parent.type) || parent.left !== node) ) { checkForSemicolon(node); } } //-------------------------------------------------------------------------- // Public API //-------------------------------------------------------------------------- return { VariableDeclaration: checkForSemicolonForVariableDeclaration, ExpressionStatement: checkForSemicolon, ReturnStatement: checkForSemicolon, ThrowStatement: checkForSemicolon, DoWhileStatement: checkForSemicolon, DebuggerStatement: checkForSemicolon, BreakStatement: checkForSemicolon, ContinueStatement: checkForSemicolon, ImportDeclaration: checkForSemicolon, ExportAllDeclaration: checkForSemicolon, ExportNamedDeclaration(node) { if (!node.declaration) { checkForSemicolon(node); } }, ExportDefaultDeclaration(node) { if (!/(?:Class|Function)Declaration/u.test(node.declaration.type)) { checkForSemicolon(node); } }, PropertyDefinition: checkForSemicolon }; } };
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