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git.proxmox.com Git - pve-eslint.git/blob - eslint/lib/rules/no-duplicate-imports.js
2 * @fileoverview Restrict usage of duplicate imports.
3 * @author Simen Bekkhus
7 //------------------------------------------------------------------------------
9 //------------------------------------------------------------------------------
12 * Returns the name of the module imported or re-exported.
13 * @param {ASTNode} node A node to get.
14 * @returns {string} the name of the module, or empty string if no name.
16 function getValue(node
) {
17 if (node
&& node
.source
&& node
.source
.value
) {
18 return node
.source
.value
.trim();
25 * Checks if the name of the import or export exists in the given array, and reports if so.
26 * @param {RuleContext} context The ESLint rule context object.
27 * @param {ASTNode} node A node to get.
28 * @param {string} value The name of the imported or exported module.
29 * @param {string[]} array The array containing other imports or exports in the file.
30 * @param {string} messageId A messageId to be reported after the name of the module
32 * @returns {void} No return value
34 function checkAndReport(context
, node
, value
, array
, messageId
) {
35 if (array
.indexOf(value
) !== -1) {
47 * @callback nodeCallback
48 * @param {ASTNode} node A node to handle.
52 * Returns a function handling the imports of a given file
53 * @param {RuleContext} context The ESLint rule context object.
54 * @param {boolean} includeExports Whether or not to check for exports in addition to imports.
55 * @param {string[]} importsInFile The array containing other imports in the file.
56 * @param {string[]} exportsInFile The array containing other exports in the file.
58 * @returns {nodeCallback} A function passed to ESLint to handle the statement.
60 function handleImports(context
, includeExports
, importsInFile
, exportsInFile
) {
61 return function(node
) {
62 const value
= getValue(node
);
65 checkAndReport(context
, node
, value
, importsInFile
, "import");
68 checkAndReport(context
, node
, value
, exportsInFile
, "importAs");
71 importsInFile
.push(value
);
77 * Returns a function handling the exports of a given file
78 * @param {RuleContext} context The ESLint rule context object.
79 * @param {string[]} importsInFile The array containing other imports in the file.
80 * @param {string[]} exportsInFile The array containing other exports in the file.
82 * @returns {nodeCallback} A function passed to ESLint to handle the statement.
84 function handleExports(context
, importsInFile
, exportsInFile
) {
85 return function(node
) {
86 const value
= getValue(node
);
89 checkAndReport(context
, node
, value
, exportsInFile
, "export");
90 checkAndReport(context
, node
, value
, importsInFile
, "exportAs");
92 exportsInFile
.push(value
);
102 description
: "disallow duplicate module imports",
103 category
: "ECMAScript 6",
105 url
: "https://eslint.org/docs/rules/no-duplicate-imports"
116 additionalProperties
: false
119 import: "'{{module}}' import is duplicated.",
120 importAs
: "'{{module}}' import is duplicated as export.",
121 export: "'{{module}}' export is duplicated.",
122 exportAs
: "'{{module}}' export is duplicated as import."
127 const includeExports
= (context
.options
[0] || {}).includeExports
,
132 ImportDeclaration
: handleImports(context
, includeExports
, importsInFile
, exportsInFile
)
135 if (includeExports
) {
136 handlers
.ExportNamedDeclaration
= handleExports(context
, importsInFile
, exportsInFile
);
137 handlers
.ExportAllDeclaration
= handleExports(context
, importsInFile
, exportsInFile
);