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308 lines
12 KiB
JavaScript
308 lines
12 KiB
JavaScript
/**
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* @fileoverview Rule to flag non-quoted property names in object literals.
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* @author Mathias Bynens <http://mathiasbynens.be/>
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*/
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"use strict";
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const espree = require("espree");
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const astUtils = require("./utils/ast-utils");
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const keywords = require("./utils/keywords");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "suggestion",
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docs: {
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description: "require quotes around object literal property names",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/quote-props"
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},
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schema: {
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anyOf: [
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{
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type: "array",
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items: [
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{
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enum: ["always", "as-needed", "consistent", "consistent-as-needed"]
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}
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],
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minItems: 0,
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maxItems: 1
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},
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{
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type: "array",
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items: [
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{
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enum: ["always", "as-needed", "consistent", "consistent-as-needed"]
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},
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{
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type: "object",
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properties: {
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keywords: {
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type: "boolean"
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},
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unnecessary: {
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type: "boolean"
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},
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numbers: {
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type: "boolean"
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}
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},
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additionalProperties: false
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}
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],
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minItems: 0,
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maxItems: 2
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}
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]
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},
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fixable: "code",
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messages: {
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requireQuotesDueToReservedWord: "Properties should be quoted as '{{property}}' is a reserved word.",
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inconsistentlyQuotedProperty: "Inconsistently quoted property '{{key}}' found.",
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unnecessarilyQuotedProperty: "Unnecessarily quoted property '{{property}}' found.",
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unquotedReservedProperty: "Unquoted reserved word '{{property}}' used as key.",
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unquotedNumericProperty: "Unquoted number literal '{{property}}' used as key.",
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unquotedPropertyFound: "Unquoted property '{{property}}' found.",
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redundantQuoting: "Properties shouldn't be quoted as all quotes are redundant."
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}
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},
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create(context) {
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const MODE = context.options[0],
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KEYWORDS = context.options[1] && context.options[1].keywords,
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CHECK_UNNECESSARY = !context.options[1] || context.options[1].unnecessary !== false,
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NUMBERS = context.options[1] && context.options[1].numbers,
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sourceCode = context.getSourceCode();
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/**
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* Checks whether a certain string constitutes an ES3 token
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* @param {string} tokenStr The string to be checked.
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* @returns {boolean} `true` if it is an ES3 token.
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*/
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function isKeyword(tokenStr) {
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return keywords.indexOf(tokenStr) >= 0;
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}
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/**
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* Checks if an espree-tokenized key has redundant quotes (i.e. whether quotes are unnecessary)
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* @param {string} rawKey The raw key value from the source
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* @param {espreeTokens} tokens The espree-tokenized node key
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* @param {boolean} [skipNumberLiterals=false] Indicates whether number literals should be checked
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* @returns {boolean} Whether or not a key has redundant quotes.
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* @private
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*/
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function areQuotesRedundant(rawKey, tokens, skipNumberLiterals) {
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return tokens.length === 1 && tokens[0].start === 0 && tokens[0].end === rawKey.length &&
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(["Identifier", "Keyword", "Null", "Boolean"].indexOf(tokens[0].type) >= 0 ||
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(tokens[0].type === "Numeric" && !skipNumberLiterals && String(+tokens[0].value) === tokens[0].value));
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}
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/**
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* Returns a string representation of a property node with quotes removed
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* @param {ASTNode} key Key AST Node, which may or may not be quoted
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* @returns {string} A replacement string for this property
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*/
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function getUnquotedKey(key) {
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return key.type === "Identifier" ? key.name : key.value;
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}
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/**
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* Returns a string representation of a property node with quotes added
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* @param {ASTNode} key Key AST Node, which may or may not be quoted
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* @returns {string} A replacement string for this property
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*/
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function getQuotedKey(key) {
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if (key.type === "Literal" && typeof key.value === "string") {
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// If the key is already a string literal, don't replace the quotes with double quotes.
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return sourceCode.getText(key);
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}
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// Otherwise, the key is either an identifier or a number literal.
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return `"${key.type === "Identifier" ? key.name : key.value}"`;
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}
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/**
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* Ensures that a property's key is quoted only when necessary
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* @param {ASTNode} node Property AST node
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* @returns {void}
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*/
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function checkUnnecessaryQuotes(node) {
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const key = node.key;
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if (node.method || node.computed || node.shorthand) {
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return;
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}
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if (key.type === "Literal" && typeof key.value === "string") {
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let tokens;
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try {
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tokens = espree.tokenize(key.value);
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} catch {
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return;
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}
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if (tokens.length !== 1) {
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return;
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}
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const isKeywordToken = isKeyword(tokens[0].value);
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if (isKeywordToken && KEYWORDS) {
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return;
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}
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if (CHECK_UNNECESSARY && areQuotesRedundant(key.value, tokens, NUMBERS)) {
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context.report({
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node,
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messageId: "unnecessarilyQuotedProperty",
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data: { property: key.value },
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fix: fixer => fixer.replaceText(key, getUnquotedKey(key))
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});
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}
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} else if (KEYWORDS && key.type === "Identifier" && isKeyword(key.name)) {
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context.report({
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node,
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messageId: "unquotedReservedProperty",
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data: { property: key.name },
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fix: fixer => fixer.replaceText(key, getQuotedKey(key))
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});
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} else if (NUMBERS && key.type === "Literal" && astUtils.isNumericLiteral(key)) {
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context.report({
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node,
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messageId: "unquotedNumericProperty",
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data: { property: key.value },
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fix: fixer => fixer.replaceText(key, getQuotedKey(key))
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});
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}
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}
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/**
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* Ensures that a property's key is quoted
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* @param {ASTNode} node Property AST node
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* @returns {void}
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*/
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function checkOmittedQuotes(node) {
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const key = node.key;
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if (!node.method && !node.computed && !node.shorthand && !(key.type === "Literal" && typeof key.value === "string")) {
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context.report({
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node,
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messageId: "unquotedPropertyFound",
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data: { property: key.name || key.value },
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fix: fixer => fixer.replaceText(key, getQuotedKey(key))
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});
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}
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}
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/**
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* Ensures that an object's keys are consistently quoted, optionally checks for redundancy of quotes
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* @param {ASTNode} node Property AST node
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* @param {boolean} checkQuotesRedundancy Whether to check quotes' redundancy
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* @returns {void}
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*/
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function checkConsistency(node, checkQuotesRedundancy) {
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const quotedProps = [],
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unquotedProps = [];
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let keywordKeyName = null,
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necessaryQuotes = false;
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node.properties.forEach(property => {
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const key = property.key;
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if (!key || property.method || property.computed || property.shorthand) {
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return;
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}
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if (key.type === "Literal" && typeof key.value === "string") {
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quotedProps.push(property);
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if (checkQuotesRedundancy) {
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let tokens;
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try {
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tokens = espree.tokenize(key.value);
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} catch {
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necessaryQuotes = true;
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return;
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}
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necessaryQuotes = necessaryQuotes || !areQuotesRedundant(key.value, tokens) || KEYWORDS && isKeyword(tokens[0].value);
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}
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} else if (KEYWORDS && checkQuotesRedundancy && key.type === "Identifier" && isKeyword(key.name)) {
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unquotedProps.push(property);
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necessaryQuotes = true;
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keywordKeyName = key.name;
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} else {
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unquotedProps.push(property);
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}
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});
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if (checkQuotesRedundancy && quotedProps.length && !necessaryQuotes) {
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quotedProps.forEach(property => {
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context.report({
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node: property,
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messageId: "redundantQuoting",
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fix: fixer => fixer.replaceText(property.key, getUnquotedKey(property.key))
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});
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});
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} else if (unquotedProps.length && keywordKeyName) {
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unquotedProps.forEach(property => {
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context.report({
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node: property,
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messageId: "requireQuotesDueToReservedWord",
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data: { property: keywordKeyName },
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fix: fixer => fixer.replaceText(property.key, getQuotedKey(property.key))
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});
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});
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} else if (quotedProps.length && unquotedProps.length) {
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unquotedProps.forEach(property => {
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context.report({
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node: property,
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messageId: "inconsistentlyQuotedProperty",
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data: { key: property.key.name || property.key.value },
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fix: fixer => fixer.replaceText(property.key, getQuotedKey(property.key))
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});
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});
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}
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}
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return {
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Property(node) {
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if (MODE === "always" || !MODE) {
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checkOmittedQuotes(node);
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}
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if (MODE === "as-needed") {
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checkUnnecessaryQuotes(node);
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}
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},
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ObjectExpression(node) {
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if (MODE === "consistent") {
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checkConsistency(node, false);
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}
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if (MODE === "consistent-as-needed") {
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checkConsistency(node, true);
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}
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}
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};
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}
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};
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