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1ada95e04a
- Convert project to Javascript/Typescript - Allow custom headers to be passed in (optional) - Allow body to be optional
341 lines
12 KiB
JavaScript
341 lines
12 KiB
JavaScript
/**
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* @fileoverview Rule to forbid or enforce dangling commas.
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* @author Ian Christian Myers
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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 lodash = require("lodash");
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Helpers
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//------------------------------------------------------------------------------
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const DEFAULT_OPTIONS = Object.freeze({
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arrays: "never",
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objects: "never",
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imports: "never",
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exports: "never",
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functions: "never"
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});
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/**
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* Checks whether or not a trailing comma is allowed in a given node.
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* If the `lastItem` is `RestElement` or `RestProperty`, it disallows trailing commas.
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* @param {ASTNode} lastItem The node of the last element in the given node.
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* @returns {boolean} `true` if a trailing comma is allowed.
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*/
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function isTrailingCommaAllowed(lastItem) {
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return !(
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lastItem.type === "RestElement" ||
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lastItem.type === "RestProperty" ||
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lastItem.type === "ExperimentalRestProperty"
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);
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}
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/**
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* Normalize option value.
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* @param {string|Object|undefined} optionValue The 1st option value to normalize.
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* @param {number} ecmaVersion The normalized ECMAScript version.
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* @returns {Object} The normalized option value.
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*/
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function normalizeOptions(optionValue, ecmaVersion) {
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if (typeof optionValue === "string") {
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return {
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arrays: optionValue,
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objects: optionValue,
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imports: optionValue,
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exports: optionValue,
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functions: (!ecmaVersion || ecmaVersion < 8) ? "ignore" : optionValue
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};
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}
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if (typeof optionValue === "object" && optionValue !== null) {
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return {
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arrays: optionValue.arrays || DEFAULT_OPTIONS.arrays,
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objects: optionValue.objects || DEFAULT_OPTIONS.objects,
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imports: optionValue.imports || DEFAULT_OPTIONS.imports,
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exports: optionValue.exports || DEFAULT_OPTIONS.exports,
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functions: optionValue.functions || DEFAULT_OPTIONS.functions
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};
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}
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return DEFAULT_OPTIONS;
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}
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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: "layout",
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docs: {
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description: "require or disallow trailing commas",
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category: "Stylistic Issues",
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recommended: false,
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url: "https://eslint.org/docs/rules/comma-dangle"
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},
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fixable: "code",
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schema: {
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definitions: {
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value: {
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enum: [
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"always-multiline",
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"always",
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"never",
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"only-multiline"
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]
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},
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valueWithIgnore: {
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enum: [
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"always-multiline",
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"always",
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"ignore",
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"never",
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"only-multiline"
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]
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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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oneOf: [
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{
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$ref: "#/definitions/value"
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},
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{
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type: "object",
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properties: {
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arrays: { $ref: "#/definitions/valueWithIgnore" },
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objects: { $ref: "#/definitions/valueWithIgnore" },
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imports: { $ref: "#/definitions/valueWithIgnore" },
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exports: { $ref: "#/definitions/valueWithIgnore" },
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functions: { $ref: "#/definitions/valueWithIgnore" }
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},
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additionalProperties: false
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}
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]
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}
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]
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},
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messages: {
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unexpected: "Unexpected trailing comma.",
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missing: "Missing trailing comma."
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}
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},
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create(context) {
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const options = normalizeOptions(context.options[0], context.parserOptions.ecmaVersion);
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const sourceCode = context.getSourceCode();
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/**
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* Gets the last item of the given node.
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* @param {ASTNode} node The node to get.
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* @returns {ASTNode|null} The last node or null.
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*/
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function getLastItem(node) {
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switch (node.type) {
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case "ObjectExpression":
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case "ObjectPattern":
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return lodash.last(node.properties);
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case "ArrayExpression":
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case "ArrayPattern":
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return lodash.last(node.elements);
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case "ImportDeclaration":
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case "ExportNamedDeclaration":
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return lodash.last(node.specifiers);
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case "FunctionDeclaration":
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case "FunctionExpression":
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case "ArrowFunctionExpression":
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return lodash.last(node.params);
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case "CallExpression":
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case "NewExpression":
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return lodash.last(node.arguments);
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default:
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return null;
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}
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}
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/**
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* Gets the trailing comma token of the given node.
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* If the trailing comma does not exist, this returns the token which is
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* the insertion point of the trailing comma token.
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* @param {ASTNode} node The node to get.
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* @param {ASTNode} lastItem The last item of the node.
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* @returns {Token} The trailing comma token or the insertion point.
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*/
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function getTrailingToken(node, lastItem) {
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switch (node.type) {
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case "ObjectExpression":
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case "ArrayExpression":
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case "CallExpression":
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case "NewExpression":
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return sourceCode.getLastToken(node, 1);
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default: {
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const nextToken = sourceCode.getTokenAfter(lastItem);
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if (astUtils.isCommaToken(nextToken)) {
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return nextToken;
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}
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return sourceCode.getLastToken(lastItem);
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}
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}
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}
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/**
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* Checks whether or not a given node is multiline.
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* This rule handles a given node as multiline when the closing parenthesis
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* and the last element are not on the same line.
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* @param {ASTNode} node A node to check.
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* @returns {boolean} `true` if the node is multiline.
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*/
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function isMultiline(node) {
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const lastItem = getLastItem(node);
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if (!lastItem) {
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return false;
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}
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const penultimateToken = getTrailingToken(node, lastItem);
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const lastToken = sourceCode.getTokenAfter(penultimateToken);
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return lastToken.loc.end.line !== penultimateToken.loc.end.line;
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}
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/**
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* Reports a trailing comma if it exists.
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* @param {ASTNode} node A node to check. Its type is one of
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* ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
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* ImportDeclaration, and ExportNamedDeclaration.
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* @returns {void}
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*/
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function forbidTrailingComma(node) {
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const lastItem = getLastItem(node);
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if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) {
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return;
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}
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const trailingToken = getTrailingToken(node, lastItem);
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if (astUtils.isCommaToken(trailingToken)) {
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context.report({
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node: lastItem,
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loc: trailingToken.loc,
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messageId: "unexpected",
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fix(fixer) {
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return fixer.remove(trailingToken);
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}
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});
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}
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}
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/**
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* Reports the last element of a given node if it does not have a trailing
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* comma.
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*
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* If a given node is `ArrayPattern` which has `RestElement`, the trailing
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* comma is disallowed, so report if it exists.
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* @param {ASTNode} node A node to check. Its type is one of
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* ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
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* ImportDeclaration, and ExportNamedDeclaration.
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* @returns {void}
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*/
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function forceTrailingComma(node) {
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const lastItem = getLastItem(node);
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if (!lastItem || (node.type === "ImportDeclaration" && lastItem.type !== "ImportSpecifier")) {
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return;
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}
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if (!isTrailingCommaAllowed(lastItem)) {
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forbidTrailingComma(node);
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return;
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}
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const trailingToken = getTrailingToken(node, lastItem);
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if (trailingToken.value !== ",") {
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context.report({
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node: lastItem,
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loc: {
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start: trailingToken.loc.end,
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end: astUtils.getNextLocation(sourceCode, trailingToken.loc.end)
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},
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messageId: "missing",
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fix(fixer) {
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return fixer.insertTextAfter(trailingToken, ",");
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}
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});
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}
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}
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/**
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* If a given node is multiline, reports the last element of a given node
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* when it does not have a trailing comma.
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* Otherwise, reports a trailing comma if it exists.
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* @param {ASTNode} node A node to check. Its type is one of
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* ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
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* ImportDeclaration, and ExportNamedDeclaration.
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* @returns {void}
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*/
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function forceTrailingCommaIfMultiline(node) {
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if (isMultiline(node)) {
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forceTrailingComma(node);
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} else {
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forbidTrailingComma(node);
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}
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}
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/**
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* Only if a given node is not multiline, reports the last element of a given node
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* when it does not have a trailing comma.
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* Otherwise, reports a trailing comma if it exists.
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* @param {ASTNode} node A node to check. Its type is one of
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* ObjectExpression, ObjectPattern, ArrayExpression, ArrayPattern,
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* ImportDeclaration, and ExportNamedDeclaration.
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* @returns {void}
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*/
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function allowTrailingCommaIfMultiline(node) {
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if (!isMultiline(node)) {
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forbidTrailingComma(node);
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}
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}
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const predicate = {
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always: forceTrailingComma,
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"always-multiline": forceTrailingCommaIfMultiline,
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"only-multiline": allowTrailingCommaIfMultiline,
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never: forbidTrailingComma,
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ignore: lodash.noop
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};
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return {
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ObjectExpression: predicate[options.objects],
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ObjectPattern: predicate[options.objects],
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ArrayExpression: predicate[options.arrays],
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ArrayPattern: predicate[options.arrays],
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ImportDeclaration: predicate[options.imports],
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ExportNamedDeclaration: predicate[options.exports],
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FunctionDeclaration: predicate[options.functions],
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FunctionExpression: predicate[options.functions],
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ArrowFunctionExpression: predicate[options.functions],
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CallExpression: predicate[options.functions],
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NewExpression: predicate[options.functions]
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};
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}
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};
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