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/** * @fileoverview Rule to require sorting of import declarations * @author Christian Schuller */ "use strict"; //------------------------------------------------------------------------------ // Rule Definition //------------------------------------------------------------------------------ /** @type {import('../shared/types').Rule} */ module.exports = { meta: { type: "suggestion", docs: { description: "Enforce sorted import declarations within modules", recommended: false, url: "https://eslint.org/docs/latest/rules/sort-imports" }, schema: [ { type: "object", properties: { ignoreCase: { type: "boolean", default: false }, memberSyntaxSortOrder: { type: "array", items: { enum: ["none", "all", "multiple", "single"] }, uniqueItems: true, minItems: 4, maxItems: 4 }, ignoreDeclarationSort: { type: "boolean", default: false }, ignoreMemberSort: { type: "boolean", default: false }, allowSeparatedGroups: { type: "boolean", default: false } }, additionalProperties: false } ], fixable: "code", messages: { sortImportsAlphabetically: "Imports should be sorted alphabetically.", sortMembersAlphabetically: "Member '{{memberName}}' of the import declaration should be sorted alphabetically.", unexpectedSyntaxOrder: "Expected '{{syntaxA}}' syntax before '{{syntaxB}}' syntax." } }, create(context) { const configuration = context.options[0] || {}, ignoreCase = configuration.ignoreCase || false, ignoreDeclarationSort = configuration.ignoreDeclarationSort || false, ignoreMemberSort = configuration.ignoreMemberSort || false, memberSyntaxSortOrder = configuration.memberSyntaxSortOrder || ["none", "all", "multiple", "single"], allowSeparatedGroups = configuration.allowSeparatedGroups || false, sourceCode = context.sourceCode; let previousDeclaration = null; /** * Gets the used member syntax style. * * import "my-module.js" --> none * import * as myModule from "my-module.js" --> all * import {myMember} from "my-module.js" --> single * import {foo, bar} from "my-module.js" --> multiple * @param {ASTNode} node the ImportDeclaration node. * @returns {string} used member parameter style, ["all", "multiple", "single"] */ function usedMemberSyntax(node) { if (node.specifiers.length === 0) { return "none"; } if (node.specifiers[0].type === "ImportNamespaceSpecifier") { return "all"; } if (node.specifiers.length === 1) { return "single"; } return "multiple"; } /** * Gets the group by member parameter index for given declaration. * @param {ASTNode} node the ImportDeclaration node. * @returns {number} the declaration group by member index. */ function getMemberParameterGroupIndex(node) { return memberSyntaxSortOrder.indexOf(usedMemberSyntax(node)); } /** * Gets the local name of the first imported module. * @param {ASTNode} node the ImportDeclaration node. * @returns {?string} the local name of the first imported module. */ function getFirstLocalMemberName(node) { if (node.specifiers[0]) { return node.specifiers[0].local.name; } return null; } /** * Calculates number of lines between two nodes. It is assumed that the given `left` node appears before * the given `right` node in the source code. Lines are counted from the end of the `left` node till the * start of the `right` node. If the given nodes are on the same line, it returns `0`, same as if they were * on two consecutive lines. * @param {ASTNode} left node that appears before the given `right` node. * @param {ASTNode} right node that appears after the given `left` node. * @returns {number} number of lines between nodes. */ function getNumberOfLinesBetween(left, right) { return Math.max(right.loc.start.line - left.loc.end.line - 1, 0); } return { ImportDeclaration(node) { if (!ignoreDeclarationSort) { if ( previousDeclaration && allowSeparatedGroups && getNumberOfLinesBetween(previousDeclaration, node) > 0 ) { // reset declaration sort previousDeclaration = null; } if (previousDeclaration) { const currentMemberSyntaxGroupIndex = getMemberParameterGroupIndex(node), previousMemberSyntaxGroupIndex = getMemberParameterGroupIndex(previousDeclaration); let currentLocalMemberName = getFirstLocalMemberName(node), previousLocalMemberName = getFirstLocalMemberName(previousDeclaration); if (ignoreCase) { previousLocalMemberName = previousLocalMemberName && previousLocalMemberName.toLowerCase(); currentLocalMemberName = currentLocalMemberName && currentLocalMemberName.toLowerCase(); } /* * When the current declaration uses a different member syntax, * then check if the ordering is correct. * Otherwise, make a default string compare (like rule sort-vars to be consistent) of the first used local member name. */ if (currentMemberSyntaxGroupIndex !== previousMemberSyntaxGroupIndex) { if (currentMemberSyntaxGroupIndex < previousMemberSyntaxGroupIndex) { context.report({ node, messageId: "unexpectedSyntaxOrder", data: { syntaxA: memberSyntaxSortOrder[currentMemberSyntaxGroupIndex], syntaxB: memberSyntaxSortOrder[previousMemberSyntaxGroupIndex] } }); } } else { if (previousLocalMemberName && currentLocalMemberName && currentLocalMemberName < previousLocalMemberName ) { context.report({ node, messageId: "sortImportsAlphabetically" }); } } } previousDeclaration = node; } if (!ignoreMemberSort) { const importSpecifiers = node.specifiers.filter(specifier => specifier.type === "ImportSpecifier"); const getSortableName = ignoreCase ? specifier => specifier.local.name.toLowerCase() : specifier => specifier.local.name; const firstUnsortedIndex = importSpecifiers.map(getSortableName).findIndex((name, index, array) => array[index - 1] > name); if (firstUnsortedIndex !== -1) { context.report({ node: importSpecifiers[firstUnsortedIndex], messageId: "sortMembersAlphabetically", data: { memberName: importSpecifiers[firstUnsortedIndex].local.name }, fix(fixer) { if (importSpecifiers.some(specifier => sourceCode.getCommentsBefore(specifier).length || sourceCode.getCommentsAfter(specifier).length)) { // If there are comments in the ImportSpecifier list, don't rearrange the specifiers. return null; } return fixer.replaceTextRange( [importSpecifiers[0].range[0], importSpecifiers[importSpecifiers.length - 1].range[1]], importSpecifiers // Clone the importSpecifiers array to avoid mutating it .slice() // Sort the array into the desired order .sort((specifierA, specifierB) => { const aName = getSortableName(specifierA); const bName = getSortableName(specifierB); return aName > bName ? 1 : -1; }) // Build a string out of the sorted list of import specifiers and the text between the originals .reduce((sourceText, specifier, index) => { const textAfterSpecifier = index === importSpecifiers.length - 1 ? "" : sourceCode.getText().slice(importSpecifiers[index].range[1], importSpecifiers[index + 1].range[0]); return sourceText + sourceCode.getText(specifier) + textAfterSpecifier; }, "") ); } }); } } } }; } };