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1ada95e04a
- Convert project to Javascript/Typescript - Allow custom headers to be passed in (optional) - Allow body to be optional
326 lines
12 KiB
JavaScript
326 lines
12 KiB
JavaScript
/**
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* @fileoverview Rule to flag non-camelcased identifiers
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* @author Nicholas C. Zakas
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*/
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"use strict";
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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: "enforce camelcase naming convention",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/camelcase"
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},
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schema: [
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{
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type: "object",
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properties: {
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ignoreDestructuring: {
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type: "boolean",
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default: false
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},
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ignoreImports: {
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type: "boolean",
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default: false
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},
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ignoreGlobals: {
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type: "boolean",
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default: false
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},
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properties: {
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enum: ["always", "never"]
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},
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allow: {
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type: "array",
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items: [
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{
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type: "string"
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}
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],
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minItems: 0,
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uniqueItems: true
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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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messages: {
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notCamelCase: "Identifier '{{name}}' is not in camel case."
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}
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},
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create(context) {
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const options = context.options[0] || {};
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let properties = options.properties || "";
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const ignoreDestructuring = options.ignoreDestructuring;
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const ignoreImports = options.ignoreImports;
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const ignoreGlobals = options.ignoreGlobals;
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const allow = options.allow || [];
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let globalScope;
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if (properties !== "always" && properties !== "never") {
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properties = "always";
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}
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//--------------------------------------------------------------------------
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// Helpers
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//--------------------------------------------------------------------------
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// contains reported nodes to avoid reporting twice on destructuring with shorthand notation
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const reported = [];
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const ALLOWED_PARENT_TYPES = new Set(["CallExpression", "NewExpression"]);
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/**
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* Checks if a string contains an underscore and isn't all upper-case
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* @param {string} name The string to check.
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* @returns {boolean} if the string is underscored
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* @private
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*/
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function isUnderscored(name) {
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// if there's an underscore, it might be A_CONSTANT, which is okay
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return name.includes("_") && name !== name.toUpperCase();
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}
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/**
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* Checks if a string match the ignore list
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* @param {string} name The string to check.
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* @returns {boolean} if the string is ignored
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* @private
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*/
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function isAllowed(name) {
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return allow.some(
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entry => name === entry || name.match(new RegExp(entry, "u"))
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);
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}
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/**
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* Checks if a parent of a node is an ObjectPattern.
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* @param {ASTNode} node The node to check.
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* @returns {boolean} if the node is inside an ObjectPattern
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* @private
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*/
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function isInsideObjectPattern(node) {
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let current = node;
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while (current) {
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const parent = current.parent;
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if (parent && parent.type === "Property" && parent.computed && parent.key === current) {
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return false;
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}
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if (current.type === "ObjectPattern") {
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return true;
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}
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current = parent;
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}
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return false;
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}
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/**
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* Checks whether the given node represents assignment target property in destructuring.
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*
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* For examples:
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* ({a: b.foo} = c); // => true for `foo`
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* ([a.foo] = b); // => true for `foo`
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* ([a.foo = 1] = b); // => true for `foo`
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* ({...a.foo} = b); // => true for `foo`
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* @param {ASTNode} node An Identifier node to check
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* @returns {boolean} True if the node is an assignment target property in destructuring.
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*/
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function isAssignmentTargetPropertyInDestructuring(node) {
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if (
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node.parent.type === "MemberExpression" &&
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node.parent.property === node &&
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!node.parent.computed
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) {
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const effectiveParent = node.parent.parent;
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return (
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effectiveParent.type === "Property" &&
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effectiveParent.value === node.parent &&
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effectiveParent.parent.type === "ObjectPattern" ||
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effectiveParent.type === "ArrayPattern" ||
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effectiveParent.type === "RestElement" ||
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(
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effectiveParent.type === "AssignmentPattern" &&
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effectiveParent.left === node.parent
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)
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);
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}
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return false;
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}
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/**
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* Checks whether the given node represents a reference to a global variable that is not declared in the source code.
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* These identifiers will be allowed, as it is assumed that user has no control over the names of external global variables.
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* @param {ASTNode} node `Identifier` node to check.
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* @returns {boolean} `true` if the node is a reference to a global variable.
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*/
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function isReferenceToGlobalVariable(node) {
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const variable = globalScope.set.get(node.name);
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return variable && variable.defs.length === 0 &&
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variable.references.some(ref => ref.identifier === node);
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}
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/**
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* Checks whether the given node represents a reference to a property of an object in an object literal expression.
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* This allows to differentiate between a global variable that is allowed to be used as a reference, and the key
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* of the expressed object (which shouldn't be allowed).
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* @param {ASTNode} node `Identifier` node to check.
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* @returns {boolean} `true` if the node is a property name of an object literal expression
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*/
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function isPropertyNameInObjectLiteral(node) {
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const parent = node.parent;
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return (
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parent.type === "Property" &&
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parent.parent.type === "ObjectExpression" &&
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!parent.computed &&
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parent.key === node
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);
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}
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/**
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* Reports an AST node as a rule violation.
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* @param {ASTNode} node The node to report.
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* @returns {void}
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* @private
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*/
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function report(node) {
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if (!reported.includes(node)) {
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reported.push(node);
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context.report({ node, messageId: "notCamelCase", data: { name: node.name } });
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}
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}
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return {
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Program() {
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globalScope = context.getScope();
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},
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Identifier(node) {
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/*
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* Leading and trailing underscores are commonly used to flag
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* private/protected identifiers, strip them before checking if underscored
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*/
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const name = node.name,
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nameIsUnderscored = isUnderscored(name.replace(/^_+|_+$/gu, "")),
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effectiveParent = (node.parent.type === "MemberExpression") ? node.parent.parent : node.parent;
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// First, we ignore the node if it match the ignore list
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if (isAllowed(name)) {
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return;
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}
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// Check if it's a global variable
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if (ignoreGlobals && isReferenceToGlobalVariable(node) && !isPropertyNameInObjectLiteral(node)) {
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return;
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}
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// MemberExpressions get special rules
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if (node.parent.type === "MemberExpression") {
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// "never" check properties
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if (properties === "never") {
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return;
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}
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// Always report underscored object names
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if (node.parent.object.type === "Identifier" && node.parent.object.name === node.name && nameIsUnderscored) {
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report(node);
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// Report AssignmentExpressions only if they are the left side of the assignment
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} else if (effectiveParent.type === "AssignmentExpression" && nameIsUnderscored && (effectiveParent.right.type !== "MemberExpression" || effectiveParent.left.type === "MemberExpression" && effectiveParent.left.property.name === node.name)) {
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report(node);
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} else if (isAssignmentTargetPropertyInDestructuring(node) && nameIsUnderscored) {
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report(node);
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}
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/*
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* Properties have their own rules, and
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* AssignmentPattern nodes can be treated like Properties:
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* e.g.: const { no_camelcased = false } = bar;
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*/
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} else if (node.parent.type === "Property" || node.parent.type === "AssignmentPattern") {
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if (node.parent.parent && node.parent.parent.type === "ObjectPattern") {
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if (node.parent.shorthand && node.parent.value.left && nameIsUnderscored) {
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report(node);
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}
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const assignmentKeyEqualsValue = node.parent.key.name === node.parent.value.name;
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if (nameIsUnderscored && node.parent.computed) {
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report(node);
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}
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// prevent checking righthand side of destructured object
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if (node.parent.key === node && node.parent.value !== node) {
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return;
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}
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const valueIsUnderscored = node.parent.value.name && nameIsUnderscored;
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// ignore destructuring if the option is set, unless a new identifier is created
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if (valueIsUnderscored && !(assignmentKeyEqualsValue && ignoreDestructuring)) {
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report(node);
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}
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}
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// "never" check properties or always ignore destructuring
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if (properties === "never" || (ignoreDestructuring && isInsideObjectPattern(node))) {
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return;
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}
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// don't check right hand side of AssignmentExpression to prevent duplicate warnings
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if (nameIsUnderscored && !ALLOWED_PARENT_TYPES.has(effectiveParent.type) && !(node.parent.right === node)) {
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report(node);
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}
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// Check if it's an import specifier
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} else if (["ImportSpecifier", "ImportNamespaceSpecifier", "ImportDefaultSpecifier"].includes(node.parent.type)) {
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if (node.parent.type === "ImportSpecifier" && ignoreImports) {
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return;
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}
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// Report only if the local imported identifier is underscored
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if (
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node.parent.local &&
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node.parent.local.name === node.name &&
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nameIsUnderscored
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) {
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report(node);
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}
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// Report anything that is underscored that isn't a CallExpression
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} else if (nameIsUnderscored && !ALLOWED_PARENT_TYPES.has(effectiveParent.type)) {
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report(node);
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}
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}
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};
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}
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};
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