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509 lines
21 KiB
509 lines
21 KiB
3 years ago
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/**
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* @fileoverview Rule to enforce concise object methods and properties.
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* @author Jamund Ferguson
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*/
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"use strict";
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const OPTIONS = {
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always: "always",
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never: "never",
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methods: "methods",
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properties: "properties",
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consistent: "consistent",
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consistentAsNeeded: "consistent-as-needed"
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};
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const astUtils = require("./utils/ast-utils");
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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 or disallow method and property shorthand syntax for object literals",
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category: "ECMAScript 6",
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recommended: false,
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url: "https://eslint.org/docs/rules/object-shorthand"
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},
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fixable: "code",
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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", "methods", "properties", "never", "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", "methods", "properties"]
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},
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{
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type: "object",
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properties: {
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avoidQuotes: {
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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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type: "array",
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items: [
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{
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enum: ["always", "methods"]
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},
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{
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type: "object",
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properties: {
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ignoreConstructors: {
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type: "boolean"
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},
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avoidQuotes: {
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type: "boolean"
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},
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avoidExplicitReturnArrows: {
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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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messages: {
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expectedAllPropertiesShorthanded: "Expected shorthand for all properties.",
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expectedLiteralMethodLongform: "Expected longform method syntax for string literal keys.",
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expectedPropertyShorthand: "Expected property shorthand.",
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expectedPropertyLongform: "Expected longform property syntax.",
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expectedMethodShorthand: "Expected method shorthand.",
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expectedMethodLongform: "Expected longform method syntax.",
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unexpectedMix: "Unexpected mix of shorthand and non-shorthand properties."
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}
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},
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create(context) {
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const APPLY = context.options[0] || OPTIONS.always;
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const APPLY_TO_METHODS = APPLY === OPTIONS.methods || APPLY === OPTIONS.always;
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const APPLY_TO_PROPS = APPLY === OPTIONS.properties || APPLY === OPTIONS.always;
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const APPLY_NEVER = APPLY === OPTIONS.never;
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const APPLY_CONSISTENT = APPLY === OPTIONS.consistent;
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const APPLY_CONSISTENT_AS_NEEDED = APPLY === OPTIONS.consistentAsNeeded;
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const PARAMS = context.options[1] || {};
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const IGNORE_CONSTRUCTORS = PARAMS.ignoreConstructors;
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const AVOID_QUOTES = PARAMS.avoidQuotes;
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const AVOID_EXPLICIT_RETURN_ARROWS = !!PARAMS.avoidExplicitReturnArrows;
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const sourceCode = context.getSourceCode();
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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const CTOR_PREFIX_REGEX = /[^_$0-9]/u;
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/**
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* Determines if the first character of the name is a capital letter.
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* @param {string} name The name of the node to evaluate.
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* @returns {boolean} True if the first character of the property name is a capital letter, false if not.
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* @private
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*/
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function isConstructor(name) {
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const match = CTOR_PREFIX_REGEX.exec(name);
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// Not a constructor if name has no characters apart from '_', '$' and digits e.g. '_', '$$', '_8'
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if (!match) {
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return false;
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}
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const firstChar = name.charAt(match.index);
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return firstChar === firstChar.toUpperCase();
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}
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/**
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* Determines if the property can have a shorthand form.
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* @param {ASTNode} property Property AST node
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* @returns {boolean} True if the property can have a shorthand form
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* @private
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*
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*/
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function canHaveShorthand(property) {
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return (property.kind !== "set" && property.kind !== "get" && property.type !== "SpreadElement" && property.type !== "SpreadProperty" && property.type !== "ExperimentalSpreadProperty");
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}
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/**
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* Checks whether a node is a string literal.
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* @param {ASTNode} node Any AST node.
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* @returns {boolean} `true` if it is a string literal.
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*/
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function isStringLiteral(node) {
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return node.type === "Literal" && typeof node.value === "string";
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}
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/**
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* Determines if the property is a shorthand or not.
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* @param {ASTNode} property Property AST node
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* @returns {boolean} True if the property is considered shorthand, false if not.
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* @private
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*
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*/
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function isShorthand(property) {
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// property.method is true when `{a(){}}`.
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return (property.shorthand || property.method);
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}
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/**
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* Determines if the property's key and method or value are named equally.
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* @param {ASTNode} property Property AST node
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* @returns {boolean} True if the key and value are named equally, false if not.
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* @private
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*
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*/
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function isRedundant(property) {
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const value = property.value;
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if (value.type === "FunctionExpression") {
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return !value.id; // Only anonymous should be shorthand method.
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}
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if (value.type === "Identifier") {
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return astUtils.getStaticPropertyName(property) === value.name;
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}
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return false;
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}
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/**
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* Ensures that an object's properties are consistently shorthand, or not shorthand at all.
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* @param {ASTNode} node Property AST node
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* @param {boolean} checkRedundancy Whether to check longform redundancy
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* @returns {void}
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*
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*/
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function checkConsistency(node, checkRedundancy) {
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// We are excluding getters/setters and spread properties as they are considered neither longform nor shorthand.
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const properties = node.properties.filter(canHaveShorthand);
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// Do we still have properties left after filtering the getters and setters?
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if (properties.length > 0) {
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const shorthandProperties = properties.filter(isShorthand);
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/*
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* If we do not have an equal number of longform properties as
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* shorthand properties, we are using the annotations inconsistently
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*/
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if (shorthandProperties.length !== properties.length) {
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// We have at least 1 shorthand property
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if (shorthandProperties.length > 0) {
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context.report({ node, messageId: "unexpectedMix" });
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} else if (checkRedundancy) {
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/*
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* If all properties of the object contain a method or value with a name matching it's key,
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* all the keys are redundant.
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*/
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const canAlwaysUseShorthand = properties.every(isRedundant);
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if (canAlwaysUseShorthand) {
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context.report({ node, messageId: "expectedAllPropertiesShorthanded" });
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}
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}
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}
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}
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}
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/**
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* Fixes a FunctionExpression node by making it into a shorthand property.
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* @param {SourceCodeFixer} fixer The fixer object
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* @param {ASTNode} node A `Property` node that has a `FunctionExpression` or `ArrowFunctionExpression` as its value
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* @returns {Object} A fix for this node
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*/
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function makeFunctionShorthand(fixer, node) {
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const firstKeyToken = node.computed
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? sourceCode.getFirstToken(node, astUtils.isOpeningBracketToken)
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: sourceCode.getFirstToken(node.key);
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const lastKeyToken = node.computed
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? sourceCode.getFirstTokenBetween(node.key, node.value, astUtils.isClosingBracketToken)
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: sourceCode.getLastToken(node.key);
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const keyText = sourceCode.text.slice(firstKeyToken.range[0], lastKeyToken.range[1]);
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let keyPrefix = "";
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// key: /* */ () => {}
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if (sourceCode.commentsExistBetween(lastKeyToken, node.value)) {
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return null;
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}
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if (node.value.async) {
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keyPrefix += "async ";
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}
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if (node.value.generator) {
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keyPrefix += "*";
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}
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const fixRange = [firstKeyToken.range[0], node.range[1]];
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const methodPrefix = keyPrefix + keyText;
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if (node.value.type === "FunctionExpression") {
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const functionToken = sourceCode.getTokens(node.value).find(token => token.type === "Keyword" && token.value === "function");
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const tokenBeforeParams = node.value.generator ? sourceCode.getTokenAfter(functionToken) : functionToken;
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return fixer.replaceTextRange(
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fixRange,
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methodPrefix + sourceCode.text.slice(tokenBeforeParams.range[1], node.value.range[1])
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);
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}
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const arrowToken = sourceCode.getTokenBefore(node.value.body, astUtils.isArrowToken);
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const fnBody = sourceCode.text.slice(arrowToken.range[1], node.value.range[1]);
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let shouldAddParensAroundParameters = false;
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let tokenBeforeParams;
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if (node.value.params.length === 0) {
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tokenBeforeParams = sourceCode.getFirstToken(node.value, astUtils.isOpeningParenToken);
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} else {
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tokenBeforeParams = sourceCode.getTokenBefore(node.value.params[0]);
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}
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if (node.value.params.length === 1) {
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const hasParen = astUtils.isOpeningParenToken(tokenBeforeParams);
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const isTokenOutsideNode = tokenBeforeParams.range[0] < node.range[0];
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shouldAddParensAroundParameters = !hasParen || isTokenOutsideNode;
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}
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const sliceStart = shouldAddParensAroundParameters
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? node.value.params[0].range[0]
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: tokenBeforeParams.range[0];
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const sliceEnd = sourceCode.getTokenBefore(arrowToken).range[1];
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const oldParamText = sourceCode.text.slice(sliceStart, sliceEnd);
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const newParamText = shouldAddParensAroundParameters ? `(${oldParamText})` : oldParamText;
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return fixer.replaceTextRange(
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fixRange,
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methodPrefix + newParamText + fnBody
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);
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}
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/**
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* Fixes a FunctionExpression node by making it into a longform property.
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* @param {SourceCodeFixer} fixer The fixer object
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* @param {ASTNode} node A `Property` node that has a `FunctionExpression` as its value
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* @returns {Object} A fix for this node
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*/
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function makeFunctionLongform(fixer, node) {
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const firstKeyToken = node.computed ? sourceCode.getTokens(node).find(token => token.value === "[") : sourceCode.getFirstToken(node.key);
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const lastKeyToken = node.computed ? sourceCode.getTokensBetween(node.key, node.value).find(token => token.value === "]") : sourceCode.getLastToken(node.key);
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const keyText = sourceCode.text.slice(firstKeyToken.range[0], lastKeyToken.range[1]);
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let functionHeader = "function";
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if (node.value.async) {
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functionHeader = `async ${functionHeader}`;
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}
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if (node.value.generator) {
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functionHeader = `${functionHeader}*`;
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}
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return fixer.replaceTextRange([node.range[0], lastKeyToken.range[1]], `${keyText}: ${functionHeader}`);
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}
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/*
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* To determine whether a given arrow function has a lexical identifier (`this`, `arguments`, `super`, or `new.target`),
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* create a stack of functions that define these identifiers (i.e. all functions except arrow functions) as the AST is
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* traversed. Whenever a new function is encountered, create a new entry on the stack (corresponding to a different lexical
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* scope of `this`), and whenever a function is exited, pop that entry off the stack. When an arrow function is entered,
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* keep a reference to it on the current stack entry, and remove that reference when the arrow function is exited.
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* When a lexical identifier is encountered, mark all the arrow functions on the current stack entry by adding them
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* to an `arrowsWithLexicalIdentifiers` set. Any arrow function in that set will not be reported by this rule,
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* because converting it into a method would change the value of one of the lexical identifiers.
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*/
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const lexicalScopeStack = [];
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const arrowsWithLexicalIdentifiers = new WeakSet();
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const argumentsIdentifiers = new WeakSet();
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/**
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* Enters a function. This creates a new lexical identifier scope, so a new Set of arrow functions is pushed onto the stack.
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* Also, this marks all `arguments` identifiers so that they can be detected later.
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* @returns {void}
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*/
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function enterFunction() {
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lexicalScopeStack.unshift(new Set());
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context.getScope().variables.filter(variable => variable.name === "arguments").forEach(variable => {
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variable.references.map(ref => ref.identifier).forEach(identifier => argumentsIdentifiers.add(identifier));
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});
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}
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/**
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* Exits a function. This pops the current set of arrow functions off the lexical scope stack.
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* @returns {void}
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*/
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function exitFunction() {
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lexicalScopeStack.shift();
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}
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/**
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* Marks the current function as having a lexical keyword. This implies that all arrow functions
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* in the current lexical scope contain a reference to this lexical keyword.
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||
|
|
* @returns {void}
|
||
|
|
*/
|
||
|
|
function reportLexicalIdentifier() {
|
||
|
|
lexicalScopeStack[0].forEach(arrowFunction => arrowsWithLexicalIdentifiers.add(arrowFunction));
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
// Public
|
||
|
|
//--------------------------------------------------------------------------
|
||
|
|
|
||
|
|
return {
|
||
|
|
Program: enterFunction,
|
||
|
|
FunctionDeclaration: enterFunction,
|
||
|
|
FunctionExpression: enterFunction,
|
||
|
|
"Program:exit": exitFunction,
|
||
|
|
"FunctionDeclaration:exit": exitFunction,
|
||
|
|
"FunctionExpression:exit": exitFunction,
|
||
|
|
|
||
|
|
ArrowFunctionExpression(node) {
|
||
|
|
lexicalScopeStack[0].add(node);
|
||
|
|
},
|
||
|
|
"ArrowFunctionExpression:exit"(node) {
|
||
|
|
lexicalScopeStack[0].delete(node);
|
||
|
|
},
|
||
|
|
|
||
|
|
ThisExpression: reportLexicalIdentifier,
|
||
|
|
Super: reportLexicalIdentifier,
|
||
|
|
MetaProperty(node) {
|
||
|
|
if (node.meta.name === "new" && node.property.name === "target") {
|
||
|
|
reportLexicalIdentifier();
|
||
|
|
}
|
||
|
|
},
|
||
|
|
Identifier(node) {
|
||
|
|
if (argumentsIdentifiers.has(node)) {
|
||
|
|
reportLexicalIdentifier();
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
ObjectExpression(node) {
|
||
|
|
if (APPLY_CONSISTENT) {
|
||
|
|
checkConsistency(node, false);
|
||
|
|
} else if (APPLY_CONSISTENT_AS_NEEDED) {
|
||
|
|
checkConsistency(node, true);
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
"Property:exit"(node) {
|
||
|
|
const isConciseProperty = node.method || node.shorthand;
|
||
|
|
|
||
|
|
// Ignore destructuring assignment
|
||
|
|
if (node.parent.type === "ObjectPattern") {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// getters and setters are ignored
|
||
|
|
if (node.kind === "get" || node.kind === "set") {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// only computed methods can fail the following checks
|
||
|
|
if (node.computed && node.value.type !== "FunctionExpression" && node.value.type !== "ArrowFunctionExpression") {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
//--------------------------------------------------------------
|
||
|
|
// Checks for property/method shorthand.
|
||
|
|
if (isConciseProperty) {
|
||
|
|
if (node.method && (APPLY_NEVER || AVOID_QUOTES && isStringLiteral(node.key))) {
|
||
|
|
const messageId = APPLY_NEVER ? "expectedMethodLongform" : "expectedLiteralMethodLongform";
|
||
|
|
|
||
|
|
// { x() {} } should be written as { x: function() {} }
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
messageId,
|
||
|
|
fix: fixer => makeFunctionLongform(fixer, node)
|
||
|
|
});
|
||
|
|
} else if (APPLY_NEVER) {
|
||
|
|
|
||
|
|
// { x } should be written as { x: x }
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
messageId: "expectedPropertyLongform",
|
||
|
|
fix: fixer => fixer.insertTextAfter(node.key, `: ${node.key.name}`)
|
||
|
|
});
|
||
|
|
}
|
||
|
|
} else if (APPLY_TO_METHODS && !node.value.id && (node.value.type === "FunctionExpression" || node.value.type === "ArrowFunctionExpression")) {
|
||
|
|
if (IGNORE_CONSTRUCTORS && node.key.type === "Identifier" && isConstructor(node.key.name)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if (AVOID_QUOTES && isStringLiteral(node.key)) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// {[x]: function(){}} should be written as {[x]() {}}
|
||
|
|
if (node.value.type === "FunctionExpression" ||
|
||
|
|
node.value.type === "ArrowFunctionExpression" &&
|
||
|
|
node.value.body.type === "BlockStatement" &&
|
||
|
|
AVOID_EXPLICIT_RETURN_ARROWS &&
|
||
|
|
!arrowsWithLexicalIdentifiers.has(node.value)
|
||
|
|
) {
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
messageId: "expectedMethodShorthand",
|
||
|
|
fix: fixer => makeFunctionShorthand(fixer, node)
|
||
|
|
});
|
||
|
|
}
|
||
|
|
} else if (node.value.type === "Identifier" && node.key.name === node.value.name && APPLY_TO_PROPS) {
|
||
|
|
|
||
|
|
// {x: x} should be written as {x}
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
messageId: "expectedPropertyShorthand",
|
||
|
|
fix(fixer) {
|
||
|
|
return fixer.replaceText(node, node.value.name);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
} else if (node.value.type === "Identifier" && node.key.type === "Literal" && node.key.value === node.value.name && APPLY_TO_PROPS) {
|
||
|
|
if (AVOID_QUOTES) {
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// {"x": x} should be written as {x}
|
||
|
|
context.report({
|
||
|
|
node,
|
||
|
|
messageId: "expectedPropertyShorthand",
|
||
|
|
fix(fixer) {
|
||
|
|
return fixer.replaceText(node, node.value.name);
|
||
|
|
}
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|
||
|
|
};
|
||
|
|
}
|
||
|
|
};
|