node_modules/eslint-plugin-import/lib/rules/no-duplicates.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 _resolve = require('eslint-module-utils/resolve');

var _resolve2 = _interopRequireDefault(_resolve);

var _docsUrl = require('../docsUrl');

var _docsUrl2 = _interopRequireDefault(_docsUrl);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) arr2[i] = arr[i]; return arr2; } else { return Array.from(arr); } }

function _toArray(arr) { return Array.isArray(arr) ? arr : Array.from(arr); }

function checkImports(imported, context) {
  for (const _ref of imported.entries()) {
    var _ref2 = _slicedToArray(_ref, 2);

    const module = _ref2[0];
    const nodes = _ref2[1];

    if (nodes.length > 1) {
      const message = `'${module}' imported multiple times.`;

      var _nodes = _toArray(nodes);

      const first = _nodes[0],
            rest = _nodes.slice(1);

      const sourceCode = context.getSourceCode();
      const fix = getFix(first, rest, sourceCode);

      context.report({
        node: first.source,
        message,
        fix // Attach the autofix (if any) to the first import.
      });

      for (const node of rest) {
        context.report({
          node: node.source,
          message
        });
      }
    }
  }
}

function getFix(first, rest, sourceCode) {
  // Sorry ESLint <= 3 users, no autofix for you. Autofixing duplicate imports
  // requires multiple `fixer.whatever()` calls in the `fix`: We both need to
  // update the first one, and remove the rest. Support for multiple
  // `fixer.whatever()` in a single `fix` was added in ESLint 4.1.
  // `sourceCode.getCommentsBefore` was added in 4.0, so that's an easy thing to
  // check for.
  if (typeof sourceCode.getCommentsBefore !== 'function') {
    return undefined;
  }

  // Adjusting the first import might make it multiline, which could break
  // `eslint-disable-next-line` comments and similar, so bail if the first
  // import has comments. Also, if the first import is `import * as ns from
  // './foo'` there's nothing we can do.
  if (hasProblematicComments(first, sourceCode) || hasNamespace(first)) {
    return undefined;
  }

  const defaultImportNames = new Set([first].concat(_toConsumableArray(rest)).map(getDefaultImportName).filter(Boolean));

  // Bail if there are multiple different default import names – it's up to the
  // user to choose which one to keep.
  if (defaultImportNames.size > 1) {
    return undefined;
  }

  // Leave it to the user to handle comments. Also skip `import * as ns from
  // './foo'` imports, since they cannot be merged into another import.
  const restWithoutComments = rest.filter(node => !(hasProblematicComments(node, sourceCode) || hasNamespace(node)));

  const specifiers = restWithoutComments.map(node => {
    const tokens = sourceCode.getTokens(node);
    const openBrace = tokens.find(token => isPunctuator(token, '{'));
    const closeBrace = tokens.find(token => isPunctuator(token, '}'));

    if (openBrace == null || closeBrace == null) {
      return undefined;
    }

    return {
      importNode: node,
      text: sourceCode.text.slice(openBrace.range[1], closeBrace.range[0]),
      hasTrailingComma: isPunctuator(sourceCode.getTokenBefore(closeBrace), ','),
      isEmpty: !hasSpecifiers(node)
    };
  }).filter(Boolean);

  const unnecessaryImports = restWithoutComments.filter(node => !hasSpecifiers(node) && !hasNamespace(node) && !specifiers.some(specifier => specifier.importNode === node));

  const shouldAddDefault = getDefaultImportName(first) == null && defaultImportNames.size === 1;
  const shouldAddSpecifiers = specifiers.length > 0;
  const shouldRemoveUnnecessary = unnecessaryImports.length > 0;

  if (!(shouldAddDefault || shouldAddSpecifiers || shouldRemoveUnnecessary)) {
    return undefined;
  }

  return fixer => {
    const tokens = sourceCode.getTokens(first);
    const openBrace = tokens.find(token => isPunctuator(token, '{'));
    const closeBrace = tokens.find(token => isPunctuator(token, '}'));
    const firstToken = sourceCode.getFirstToken(first);

    var _defaultImportNames = _slicedToArray(defaultImportNames, 1);

    const defaultImportName = _defaultImportNames[0];


    const firstHasTrailingComma = closeBrace != null && isPunctuator(sourceCode.getTokenBefore(closeBrace), ',');
    const firstIsEmpty = !hasSpecifiers(first);

    var _specifiers$reduce = specifiers.reduce((_ref3, specifier) => {
      var _ref4 = _slicedToArray(_ref3, 2);

      let result = _ref4[0],
          needsComma = _ref4[1];

      return [needsComma && !specifier.isEmpty ? `${result},${specifier.text}` : `${result}${specifier.text}`, specifier.isEmpty ? needsComma : true];
    }, ['', !firstHasTrailingComma && !firstIsEmpty]),
        _specifiers$reduce2 = _slicedToArray(_specifiers$reduce, 1);

    const specifiersText = _specifiers$reduce2[0];


    const fixes = [];

    if (shouldAddDefault && openBrace == null && shouldAddSpecifiers) {
      // `import './foo'` → `import def, {...} from './foo'`
      fixes.push(fixer.insertTextAfter(firstToken, ` ${defaultImportName}, {${specifiersText}} from`));
    } else if (shouldAddDefault && openBrace == null && !shouldAddSpecifiers) {
      // `import './foo'` → `import def from './foo'`
      fixes.push(fixer.insertTextAfter(firstToken, ` ${defaultImportName} from`));
    } else if (shouldAddDefault && openBrace != null && closeBrace != null) {
      // `import {...} from './foo'` → `import def, {...} from './foo'`
      fixes.push(fixer.insertTextAfter(firstToken, ` ${defaultImportName},`));
      if (shouldAddSpecifiers) {
        // `import def, {...} from './foo'` → `import def, {..., ...} from './foo'`
        fixes.push(fixer.insertTextBefore(closeBrace, specifiersText));
      }
    } else if (!shouldAddDefault && openBrace == null && shouldAddSpecifiers) {
      // `import './foo'` → `import {...} from './foo'`
      fixes.push(fixer.insertTextAfter(firstToken, ` {${specifiersText}} from`));
    } else if (!shouldAddDefault && openBrace != null && closeBrace != null) {
      // `import {...} './foo'` → `import {..., ...} from './foo'`
      fixes.push(fixer.insertTextBefore(closeBrace, specifiersText));
    }

    // Remove imports whose specifiers have been moved into the first import.
    for (const specifier of specifiers) {
      fixes.push(fixer.remove(specifier.importNode));
    }

    // Remove imports whose default import has been moved to the first import,
    // and side-effect-only imports that are unnecessary due to the first
    // import.
    for (const node of unnecessaryImports) {
      fixes.push(fixer.remove(node));
    }

    return fixes;
  };
}

function isPunctuator(node, value) {
  return node.type === 'Punctuator' && node.value === value;
}

// Get the name of the default import of `node`, if any.
function getDefaultImportName(node) {
  const defaultSpecifier = node.specifiers.find(specifier => specifier.type === 'ImportDefaultSpecifier');
  return defaultSpecifier != null ? defaultSpecifier.local.name : undefined;
}

// Checks whether `node` has a namespace import.
function hasNamespace(node) {
  const specifiers = node.specifiers.filter(specifier => specifier.type === 'ImportNamespaceSpecifier');
  return specifiers.length > 0;
}

// Checks whether `node` has any non-default specifiers.
function hasSpecifiers(node) {
  const specifiers = node.specifiers.filter(specifier => specifier.type === 'ImportSpecifier');
  return specifiers.length > 0;
}

// It's not obvious what the user wants to do with comments associated with
// duplicate imports, so skip imports with comments when autofixing.
function hasProblematicComments(node, sourceCode) {
  return hasCommentBefore(node, sourceCode) || hasCommentAfter(node, sourceCode) || hasCommentInsideNonSpecifiers(node, sourceCode);
}

// Checks whether `node` has a comment (that ends) on the previous line or on
// the same line as `node` (starts).
function hasCommentBefore(node, sourceCode) {
  return sourceCode.getCommentsBefore(node).some(comment => comment.loc.end.line >= node.loc.start.line - 1);
}

// Checks whether `node` has a comment (that starts) on the same line as `node`
// (ends).
function hasCommentAfter(node, sourceCode) {
  return sourceCode.getCommentsAfter(node).some(comment => comment.loc.start.line === node.loc.end.line);
}

// Checks whether `node` has any comments _inside,_ except inside the `{...}`
// part (if any).
function hasCommentInsideNonSpecifiers(node, sourceCode) {
  const tokens = sourceCode.getTokens(node);
  const openBraceIndex = tokens.findIndex(token => isPunctuator(token, '{'));
  const closeBraceIndex = tokens.findIndex(token => isPunctuator(token, '}'));
  // Slice away the first token, since we're no looking for comments _before_
  // `node` (only inside). If there's a `{...}` part, look for comments before
  // the `{`, but not before the `}` (hence the `+1`s).
  const someTokens = openBraceIndex >= 0 && closeBraceIndex >= 0 ? tokens.slice(1, openBraceIndex + 1).concat(tokens.slice(closeBraceIndex + 1)) : tokens.slice(1);
  return someTokens.some(token => sourceCode.getCommentsBefore(token).length > 0);
}

module.exports = {
  meta: {
    type: 'problem',
    docs: {
      url: (0, _docsUrl2.default)('no-duplicates')
    },
    fixable: 'code',
    schema: [{
      type: 'object',
      properties: {
        considerQueryString: {
          type: 'boolean'
        }
      },
      additionalProperties: false
    }]
  },

  create: function (context) {
    // Prepare the resolver from options.
    const considerQueryStringOption = context.options[0] && context.options[0]['considerQueryString'];
    const defaultResolver = sourcePath => (0, _resolve2.default)(sourcePath, context) || sourcePath;
    const resolver = considerQueryStringOption ? sourcePath => {
      const parts = sourcePath.match(/^([^?]*)\?(.*)$/);
      if (!parts) {
        return defaultResolver(sourcePath);
      }
      return defaultResolver(parts[1]) + '?' + parts[2];
    } : defaultResolver;

    const imported = new Map();
    const nsImported = new Map();
    const typesImported = new Map();
    return {
      'ImportDeclaration': function (n) {
        // resolved path will cover aliased duplicates
        const resolvedPath = resolver(n.source.value);
        const importMap = n.importKind === 'type' ? typesImported : hasNamespace(n) ? nsImported : imported;

        if (importMap.has(resolvedPath)) {
          importMap.get(resolvedPath).push(n);
        } else {
          importMap.set(resolvedPath, [n]);
        }
      },

      'Program:exit': function () {
        checkImports(imported, context);
        checkImports(nsImported, context);
        checkImports(typesImported, context);
      }
    };
  }
};
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resolve from 'eslint-module-utils/resolve'\nimport docsUrl from '../docsUrl'\n\nfunction checkImports(imported, context) {\n  for (const [module, nodes] of imported.entries()) {\n    if (nodes.length > 1) {\n      const message = `'${module}' imported multiple times.`\n      const [first, ...rest] = nodes\n      const sourceCode = context.getSourceCode()\n      const fix = getFix(first, rest, sourceCode)\n\n      context.report({\n        node: first.source,\n        message,\n        fix, // Attach the autofix (if any) to the first import.\n      })\n\n      for (const node of rest) {\n        context.report({\n          node: node.source,\n          message,\n        })\n      }\n    }\n  }\n}\n\nfunction getFix(first, rest, sourceCode) {\n  // Sorry ESLint <= 3 users, no autofix for you. Autofixing duplicate imports\n  // requires multiple `fixer.whatever()` calls in the `fix`: We both need to\n  // update the first one, and remove the rest. Support for multiple\n  // `fixer.whatever()` in a single `fix` was added in ESLint 4.1.\n  // `sourceCode.getCommentsBefore` was added in 4.0, so that's an easy thing to\n  // check for.\n  if (typeof sourceCode.getCommentsBefore !== 'function') {\n    return undefined\n  }\n\n  // Adjusting the first import might make it multiline, which could break\n  // `eslint-disable-next-line` comments and similar, so bail if the first\n  // import has comments. Also, if the first import is `import * as ns from\n  // './foo'` there's nothing we can do.\n  if (hasProblematicComments(first, sourceCode) || hasNamespace(first)) {\n    return undefined\n  }\n\n  const defaultImportNames = new Set(\n    [first, ...rest].map(getDefaultImportName).filter(Boolean)\n  )\n\n  // Bail if there are multiple different default import names – it's up to the\n  // user to choose which one to keep.\n  if (defaultImportNames.size > 1) {\n    return undefined\n  }\n\n  // Leave it to the user to handle comments. Also skip `import * as ns from\n  // './foo'` imports, since they cannot be merged into another import.\n  const restWithoutComments = rest.filter(node => !(\n    hasProblematicComments(node, sourceCode) ||\n    hasNamespace(node)\n  ))\n\n  const specifiers = restWithoutComments\n    .map(node => {\n      const tokens = sourceCode.getTokens(node)\n      const openBrace = tokens.find(token => isPunctuator(token, '{'))\n      const closeBrace = tokens.find(token => isPunctuator(token, '}'))\n\n      if (openBrace == null || closeBrace == null) {\n        return undefined\n      }\n\n      return {\n        importNode: node,\n        text: sourceCode.text.slice(openBrace.range[1], closeBrace.range[0]),\n        hasTrailingComma: isPunctuator(sourceCode.getTokenBefore(closeBrace), ','),\n        isEmpty: !hasSpecifiers(node),\n      }\n    })\n    .filter(Boolean)\n\n  const unnecessaryImports = restWithoutComments.filter(node =>\n    !hasSpecifiers(node) &&\n    !hasNamespace(node) &&\n    !specifiers.some(specifier => specifier.importNode === node)\n  )\n\n  const shouldAddDefault = getDefaultImportName(first) == null && defaultImportNames.size === 1\n  const shouldAddSpecifiers = specifiers.length > 0\n  const shouldRemoveUnnecessary = unnecessaryImports.length > 0\n\n  if (!(shouldAddDefault || shouldAddSpecifiers || shouldRemoveUnnecessary)) {\n    return undefined\n  }\n\n  return fixer => {\n    const tokens = sourceCode.getTokens(first)\n    const openBrace = tokens.find(token => isPunctuator(token, '{'))\n    const closeBrace = tokens.find(token => isPunctuator(token, '}'))\n    const firstToken = sourceCode.getFirstToken(first)\n    const [defaultImportName] = defaultImportNames\n\n    const firstHasTrailingComma =\n      closeBrace != null &&\n      isPunctuator(sourceCode.getTokenBefore(closeBrace), ',')\n    const firstIsEmpty = !hasSpecifiers(first)\n\n    const [specifiersText] = specifiers.reduce(\n      ([result, needsComma], specifier) => {\n        return [\n          needsComma && !specifier.isEmpty\n            ? `${result},${specifier.text}`\n            : `${result}${specifier.text}`,\n          specifier.isEmpty ? needsComma : true,\n        ]\n      },\n      ['', !firstHasTrailingComma && !firstIsEmpty]\n    )\n\n    const fixes = []\n\n    if (shouldAddDefault && openBrace == null && shouldAddSpecifiers) {\n      // `import './foo'` → `import def, {...} from './foo'`\n      fixes.push(\n        fixer.insertTextAfter(firstToken, ` ${defaultImportName}, {${specifiersText}} from`)\n      )\n    } else if (shouldAddDefault && openBrace == null && !shouldAddSpecifiers) {\n      // `import './foo'` → `import def from './foo'`\n      fixes.push(fixer.insertTextAfter(firstToken, ` ${defaultImportName} from`))\n    } else if (shouldAddDefault && openBrace != null && closeBrace != null) {\n      // `import {...} from './foo'` → `import def, {...} from './foo'`\n      fixes.push(fixer.insertTextAfter(firstToken, ` ${defaultImportName},`))\n      if (shouldAddSpecifiers) {\n        // `import def, {...} from './foo'` → `import def, {..., ...} from './foo'`\n        fixes.push(fixer.insertTextBefore(closeBrace, specifiersText))\n      }\n    } else if (!shouldAddDefault && openBrace == null && shouldAddSpecifiers) {\n      // `import './foo'` → `import {...} from './foo'`\n      fixes.push(fixer.insertTextAfter(firstToken, ` {${specifiersText}} from`))\n    } else if (!shouldAddDefault && openBrace != null && closeBrace != null) {\n      // `import {...} './foo'` → `import {..., ...} from './foo'`\n      fixes.push(fixer.insertTextBefore(closeBrace, specifiersText))\n    }\n\n    // Remove imports whose specifiers have been moved into the first import.\n    for (const specifier of specifiers) {\n      fixes.push(fixer.remove(specifier.importNode))\n    }\n\n    // Remove imports whose default import has been moved to the first import,\n    // and side-effect-only imports that are unnecessary due to the first\n    // import.\n    for (const node of unnecessaryImports) {\n      fixes.push(fixer.remove(node))\n    }\n\n    return fixes\n  }\n}\n\nfunction isPunctuator(node, value) {\n  return node.type === 'Punctuator' && node.value === value\n}\n\n// Get the name of the default import of `node`, if any.\nfunction getDefaultImportName(node) {\n  const defaultSpecifier = node.specifiers\n    .find(specifier => specifier.type === 'ImportDefaultSpecifier')\n  return defaultSpecifier != null ? defaultSpecifier.local.name : undefined\n}\n\n// Checks whether `node` has a namespace import.\nfunction hasNamespace(node) {\n  const specifiers = node.specifiers\n    .filter(specifier => specifier.type === 'ImportNamespaceSpecifier')\n  return specifiers.length > 0\n}\n\n// Checks whether `node` has any non-default specifiers.\nfunction hasSpecifiers(node) {\n  const specifiers = node.specifiers\n    .filter(specifier => specifier.type === 'ImportSpecifier')\n  return specifiers.length > 0\n}\n\n// It's not obvious what the user wants to do with comments associated with\n// duplicate imports, so skip imports with comments when autofixing.\nfunction hasProblematicComments(node, sourceCode) {\n  return (\n    hasCommentBefore(node, sourceCode) ||\n    hasCommentAfter(node, sourceCode) ||\n    hasCommentInsideNonSpecifiers(node, sourceCode)\n  )\n}\n\n// Checks whether `node` has a comment (that ends) on the previous line or on\n// the same line as `node` (starts).\nfunction hasCommentBefore(node, sourceCode) {\n  return sourceCode.getCommentsBefore(node)\n    .some(comment => comment.loc.end.line >= node.loc.start.line - 1)\n}\n\n// Checks whether `node` has a comment (that starts) on the same line as `node`\n// (ends).\nfunction hasCommentAfter(node, sourceCode) {\n  return sourceCode.getCommentsAfter(node)\n    .some(comment => comment.loc.start.line === node.loc.end.line)\n}\n\n// Checks whether `node` has any comments _inside,_ except inside the `{...}`\n// part (if any).\nfunction hasCommentInsideNonSpecifiers(node, sourceCode) {\n  const tokens = sourceCode.getTokens(node)\n  const openBraceIndex = tokens.findIndex(token => isPunctuator(token, '{'))\n  const closeBraceIndex = tokens.findIndex(token => isPunctuator(token, '}'))\n  // Slice away the first token, since we're no looking for comments _before_\n  // `node` (only inside). If there's a `{...}` part, look for comments before\n  // the `{`, but not before the `}` (hence the `+1`s).\n  const someTokens = openBraceIndex >= 0 && closeBraceIndex >= 0\n    ? tokens.slice(1, openBraceIndex + 1).concat(tokens.slice(closeBraceIndex + 1))\n    : tokens.slice(1)\n  return someTokens.some(token => sourceCode.getCommentsBefore(token).length > 0)\n}\n\nmodule.exports = {\n  meta: {\n    type: 'problem',\n    docs: {\n      url: docsUrl('no-duplicates'),\n    },\n    fixable: 'code',\n    schema: [\n      {\n        type: 'object',\n        properties: {\n          considerQueryString: {\n            type: 'boolean',\n          },\n        },\n        additionalProperties: false,\n      },\n    ],\n  },\n\n  create: function (context) {\n    // Prepare the resolver from options.\n    const considerQueryStringOption = context.options[0] &&\n      context.options[0]['considerQueryString']\n    const defaultResolver = sourcePath => resolve(sourcePath, context) || sourcePath\n    const resolver = considerQueryStringOption ? (sourcePath => {\n      const parts = sourcePath.match(/^([^?]*)\\?(.*)$/)\n      if (!parts) {\n        return defaultResolver(sourcePath)\n      }\n      return defaultResolver(parts[1]) + '?' + parts[2]\n    }) : defaultResolver\n\n    const imported = new Map()\n    const nsImported = new Map()\n    const typesImported = new Map()\n    return {\n      'ImportDeclaration': function (n) {\n        // resolved path will cover aliased duplicates\n        const resolvedPath = resolver(n.source.value)\n        const importMap = n.importKind === 'type' ? typesImported :\n          (hasNamespace(n) ? nsImported : imported)\n\n        if (importMap.has(resolvedPath)) {\n          importMap.get(resolvedPath).push(n)\n        } else {\n          importMap.set(resolvedPath, [n])\n        }\n      },\n\n      'Program:exit': function () {\n        checkImports(imported, context)\n        checkImports(nsImported, context)\n        checkImports(typesImported, context)\n      },\n    }\n  },\n}\n"]}