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node_modules/eslint/lib/rules/rest-spread-spacing.js 3.9 KB
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  /**
   * @fileoverview Enforce spacing between rest and spread operators and their expressions.
   * @author Kai Cataldo
   */
  
  "use strict";
  
  //------------------------------------------------------------------------------
  // Rule Definition
  //------------------------------------------------------------------------------
  
  module.exports = {
      meta: {
          docs: {
              description: "enforce spacing between rest and spread operators and their expressions",
              category: "ECMAScript 6",
              recommended: false,
              url: "https://eslint.org/docs/rules/rest-spread-spacing"
          },
          fixable: "whitespace",
          schema: [
              {
                  enum: ["always", "never"]
              }
          ]
      },
  
      create(context) {
          const sourceCode = context.getSourceCode(),
              alwaysSpace = context.options[0] === "always";
  
          //--------------------------------------------------------------------------
          // Helpers
          //--------------------------------------------------------------------------
  
          /**
           * Checks whitespace between rest/spread operators and their expressions
           * @param {ASTNode} node - The node to check
           * @returns {void}
           */
          function checkWhiteSpace(node) {
              const operator = sourceCode.getFirstToken(node),
                  nextToken = sourceCode.getTokenAfter(operator),
                  hasWhitespace = sourceCode.isSpaceBetweenTokens(operator, nextToken);
              let type;
  
              switch (node.type) {
                  case "SpreadElement":
                      type = "spread";
                      if (node.parent.type === "ObjectExpression") {
                          type += " property";
                      }
                      break;
                  case "RestElement":
                      type = "rest";
                      if (node.parent.type === "ObjectPattern") {
                          type += " property";
                      }
                      break;
                  case "ExperimentalSpreadProperty":
                      type = "spread property";
                      break;
                  case "ExperimentalRestProperty":
                      type = "rest property";
                      break;
                  default:
                      return;
              }
  
              if (alwaysSpace && !hasWhitespace) {
                  context.report({
                      node,
                      loc: {
                          line: operator.loc.end.line,
                          column: operator.loc.end.column
                      },
                      message: "Expected whitespace after {{type}} operator.",
                      data: {
                          type
                      },
                      fix(fixer) {
                          return fixer.replaceTextRange([operator.range[1], nextToken.range[0]], " ");
                      }
                  });
              } else if (!alwaysSpace && hasWhitespace) {
                  context.report({
                      node,
                      loc: {
                          line: operator.loc.end.line,
                          column: operator.loc.end.column
                      },
                      message: "Unexpected whitespace after {{type}} operator.",
                      data: {
                          type
                      },
                      fix(fixer) {
                          return fixer.removeRange([operator.range[1], nextToken.range[0]]);
                      }
                  });
              }
          }
  
          //--------------------------------------------------------------------------
          // Public
          //--------------------------------------------------------------------------
  
          return {
              SpreadElement: checkWhiteSpace,
              RestElement: checkWhiteSpace,
              ExperimentalSpreadProperty: checkWhiteSpace,
              ExperimentalRestProperty: checkWhiteSpace
          };
      }
  };