no-empty-named-blocks.js

'use strict';var _slicedToArray = function () {function sliceIterator(arr, i) {var _arr = [];var _n = true;var _d = false;var _e = undefined;try {for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {_arr.push(_s.value);if (i && _arr.length === i) break;}} catch (err) {_d = true;_e = err;} finally {try {if (!_n && _i["return"]) _i["return"]();} finally {if (_d) throw _e;}}return _arr;}return function (arr, i) {if (Array.isArray(arr)) {return arr;} else if (Symbol.iterator in Object(arr)) {return sliceIterator(arr, i);} else {throw new TypeError("Invalid attempt to destructure non-iterable instance");}};}();var _docsUrl = require('../docsUrl');var _docsUrl2 = _interopRequireDefault(_docsUrl);function _interopRequireDefault(obj) {return obj && obj.__esModule ? obj : { 'default': obj };}

function getEmptyBlockRange(tokens, index) {
  var token = tokens[index];
  var nextToken = tokens[index + 1];
  var prevToken = tokens[index - 1];
  var start = token.range[0];
  var end = nextToken.range[1];

  // Remove block tokens and the previous comma
  if (prevToken.value === ',' || prevToken.value === 'type' || prevToken.value === 'typeof') {
    start = prevToken.range[0];
  }

  return [start, end];
}

module.exports = {
  meta: {
    type: 'suggestion',
    docs: {
      category: 'Helpful warnings',
      description: 'Forbid empty named import blocks.',
      url: (0, _docsUrl2['default'])('no-empty-named-blocks') },

    fixable: 'code',
    schema: [],
    hasSuggestions: true },


  create: function () {function create(context) {
      var importsWithoutNameds = [];

      return {
        ImportDeclaration: function () {function ImportDeclaration(node) {
            if (!node.specifiers.some(function (x) {return x.type === 'ImportSpecifier';})) {
              importsWithoutNameds.push(node);
            }
          }return ImportDeclaration;}(),

        'Program:exit': function () {function ProgramExit(program) {
            var importsTokens = importsWithoutNameds.map(function (node) {return [node, program.tokens.filter(function (x) {return x.range[0] >= node.range[0] && x.range[1] <= node.range[1];})];});

            importsTokens.forEach(function (_ref) {var _ref2 = _slicedToArray(_ref, 2),node = _ref2[0],tokens = _ref2[1];
              tokens.forEach(function (token) {
                var idx = program.tokens.indexOf(token);
                var nextToken = program.tokens[idx + 1];

                if (nextToken && token.value === '{' && nextToken.value === '}') {
                  var hasOtherIdentifiers = tokens.some(function (token) {return token.type === 'Identifier' &&
                    token.value !== 'from' &&
                    token.value !== 'type' &&
                    token.value !== 'typeof';});


                  // If it has no other identifiers it's the only thing in the import, so we can either remove the import
                  // completely or transform it in a side-effects only import
                  if (!hasOtherIdentifiers) {
                    context.report({
                      node: node,
                      message: 'Unexpected empty named import block',
                      suggest: [
                      {
                        desc: 'Remove unused import',
                        fix: function () {function fix(fixer) {
                            // Remove the whole import
                            return fixer.remove(node);
                          }return fix;}() },

                      {
                        desc: 'Remove empty import block',
                        fix: function () {function fix(fixer) {
                            // Remove the empty block and the 'from' token, leaving the import only for its side
                            // effects, e.g. `import 'mod'`
                            var sourceCode = context.getSourceCode();
                            var fromToken = program.tokens.find(function (t) {return t.value === 'from';});
                            var importToken = program.tokens.find(function (t) {return t.value === 'import';});
                            var hasSpaceAfterFrom = sourceCode.isSpaceBetween(fromToken, sourceCode.getTokenAfter(fromToken));
                            var hasSpaceAfterImport = sourceCode.isSpaceBetween(importToken, sourceCode.getTokenAfter(fromToken));var _getEmptyBlockRange =

                            getEmptyBlockRange(program.tokens, idx),_getEmptyBlockRange2 = _slicedToArray(_getEmptyBlockRange, 1),start = _getEmptyBlockRange2[0];var _fromToken$range = _slicedToArray(
                            fromToken.range, 2),end = _fromToken$range[1];
                            var range = [start, hasSpaceAfterFrom ? end + 1 : end];

                            return fixer.replaceTextRange(range, hasSpaceAfterImport ? '' : ' ');
                          }return fix;}() }] });



                  } else {
                    context.report({
                      node: node,
                      message: 'Unexpected empty named import block',
                      fix: function () {function fix(fixer) {
                          return fixer.removeRange(getEmptyBlockRange(program.tokens, idx));
                        }return fix;}() });

                  }
                }
              });
            });
          }return ProgramExit;}() };

    }return create;}() };
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1];\n  let start = token.range[0];\n  const end = nextToken.range[1];\n\n  // Remove block tokens and the previous comma\n  if (prevToken.value === ',' || prevToken.value === 'type' || prevToken.value === 'typeof') {\n    start = prevToken.range[0];\n  }\n\n  return [start, end];\n}\n\nmodule.exports = {\n  meta: {\n    type: 'suggestion',\n    docs: {\n      category: 'Helpful warnings',\n      description: 'Forbid empty named import blocks.',\n      url: docsUrl('no-empty-named-blocks'),\n    },\n    fixable: 'code',\n    schema: [],\n    hasSuggestions: true,\n  },\n\n  create(context) {\n    const importsWithoutNameds = [];\n\n    return {\n      ImportDeclaration(node) {\n        if (!node.specifiers.some((x) => x.type === 'ImportSpecifier')) {\n          importsWithoutNameds.push(node);\n        }\n      },\n\n      'Program:exit'(program) {\n        const importsTokens = importsWithoutNameds.map((node) => [node, program.tokens.filter((x) => x.range[0] >= node.range[0] && x.range[1] <= node.range[1])]);\n\n        importsTokens.forEach(([node, tokens]) => {\n          tokens.forEach((token) => {\n            const idx = program.tokens.indexOf(token);\n            const nextToken = program.tokens[idx + 1];\n\n            if (nextToken && token.value === '{' && nextToken.value === '}') {\n              const hasOtherIdentifiers = tokens.some((token) => token.type === 'Identifier'\n                  && token.value !== 'from'\n                  && token.value !== 'type'\n                  && token.value !== 'typeof',\n              );\n\n              // If it has no other identifiers it's the only thing in the import, so we can either remove the import\n              // completely or transform it in a side-effects only import\n              if (!hasOtherIdentifiers) {\n                context.report({\n                  node,\n                  message: 'Unexpected empty named import block',\n                  suggest: [\n                    {\n                      desc: 'Remove unused import',\n                      fix(fixer) {\n                        // Remove the whole import\n                        return fixer.remove(node);\n                      },\n                    },\n                    {\n                      desc: 'Remove empty import block',\n                      fix(fixer) {\n                        // Remove the empty block and the 'from' token, leaving the import only for its side\n                        // effects, e.g. `import 'mod'`\n                        const sourceCode = context.getSourceCode();\n                        const fromToken = program.tokens.find((t) => t.value === 'from');\n                        const importToken = program.tokens.find((t) => t.value === 'import');\n                        const hasSpaceAfterFrom = sourceCode.isSpaceBetween(fromToken, sourceCode.getTokenAfter(fromToken));\n                        const hasSpaceAfterImport = sourceCode.isSpaceBetween(importToken, sourceCode.getTokenAfter(fromToken));\n\n                        const [start] = getEmptyBlockRange(program.tokens, idx);\n                        const [, end] = fromToken.range;\n                        const range = [start, hasSpaceAfterFrom ? end + 1 : end];\n\n                        return fixer.replaceTextRange(range, hasSpaceAfterImport ? '' : ' ');\n                      },\n                    },\n                  ],\n                });\n              } else {\n                context.report({\n                  node,\n                  message: 'Unexpected empty named import block',\n                  fix(fixer) {\n                    return fixer.removeRange(getEmptyBlockRange(program.tokens, idx));\n                  },\n                });\n              }\n            }\n          });\n        });\n      },\n    };\n  },\n};\n"]}