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Viewing file:     space-before-function-paren.js (5.87 KB)      -rw-r--r--

/**
 * @fileoverview Rule to validate spacing before function paren.
 * @author Mathias Schreck <https://github.com/lo1tuma>
 * @deprecated in ESLint v8.53.0
 */
"use strict";

//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------

const astUtils = require("./utils/ast-utils");

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../shared/types').Rule} */
module.exports = {
    meta: {
        deprecated: true,
        replacedBy: [],
        type: "layout",

        docs: {
            description: "Enforce consistent spacing before `function` definition opening parenthesis",
            recommended: false,
            url: "https://eslint.org/docs/latest/rules/space-before-function-paren"
        },

        fixable: "whitespace",

        schema: [
            {
                oneOf: [
                    {
                        enum: ["always", "never"]
                    },
                    {
                        type: "object",
                        properties: {
                            anonymous: {
                                enum: ["always", "never", "ignore"]
                            },
                            named: {
                                enum: ["always", "never", "ignore"]
                            },
                            asyncArrow: {
                                enum: ["always", "never", "ignore"]
                            }
                        },
                        additionalProperties: false
                    }
                ]
            }
        ],

        messages: {
            unexpectedSpace: "Unexpected space before function parentheses.",
            missingSpace: "Missing space before function parentheses."
        }
    },

    create(context) {
        const sourceCode = context.sourceCode;
        const baseConfig = typeof context.options[0] === "string" ? context.options[0] : "always";
        const overrideConfig = typeof context.options[0] === "object" ? context.options[0] : {};

        /**
         * Determines whether a function has a name.
         * @param {ASTNode} node The function node.
         * @returns {boolean} Whether the function has a name.
         */
        function isNamedFunction(node) {
            if (node.id) {
                return true;
            }

            const parent = node.parent;

            return parent.type === "MethodDefinition" ||
                (parent.type === "Property" &&
                    (
                        parent.kind === "get" ||
                        parent.kind === "set" ||
                        parent.method
                    )
                );
        }

        /**
         * Gets the config for a given function
         * @param {ASTNode} node The function node
         * @returns {string} "always", "never", or "ignore"
         */
        function getConfigForFunction(node) {
            if (node.type === "ArrowFunctionExpression") {

                // Always ignore non-async functions and arrow functions without parens, e.g. async foo => bar
                if (node.async && astUtils.isOpeningParenToken(sourceCode.getFirstToken(node, { skip: 1 }))) {
                    return overrideConfig.asyncArrow || baseConfig;
                }
            } else if (isNamedFunction(node)) {
                return overrideConfig.named || baseConfig;

            // `generator-star-spacing` should warn anonymous generators. E.g. `function* () {}`
            } else if (!node.generator) {
                return overrideConfig.anonymous || baseConfig;
            }

            return "ignore";
        }

        /**
         * Checks the parens of a function node
         * @param {ASTNode} node A function node
         * @returns {void}
         */
        function checkFunction(node) {
            const functionConfig = getConfigForFunction(node);

            if (functionConfig === "ignore") {
                return;
            }

            const rightToken = sourceCode.getFirstToken(node, astUtils.isOpeningParenToken);
            const leftToken = sourceCode.getTokenBefore(rightToken);
            const hasSpacing = sourceCode.isSpaceBetweenTokens(leftToken, rightToken);

            if (hasSpacing && functionConfig === "never") {
                context.report({
                    node,
                    loc: {
                        start: leftToken.loc.end,
                        end: rightToken.loc.start
                    },
                    messageId: "unexpectedSpace",
                    fix(fixer) {
                        const comments = sourceCode.getCommentsBefore(rightToken);

                        // Don't fix anything if there's a single line comment between the left and the right token
                        if (comments.some(comment => comment.type === "Line")) {
                            return null;
                        }
                        return fixer.replaceTextRange(
                            [leftToken.range[1], rightToken.range[0]],
                            comments.reduce((text, comment) => text + sourceCode.getText(comment), "")
                        );
                    }
                });
            } else if (!hasSpacing && functionConfig === "always") {
                context.report({
                    node,
                    loc: rightToken.loc,
                    messageId: "missingSpace",
                    fix: fixer => fixer.insertTextAfter(leftToken, " ")
                });
            }
        }

        return {
            ArrowFunctionExpression: checkFunction,
            FunctionDeclaration: checkFunction,
            FunctionExpression: checkFunction
        };
    }
};