@slippy-lint/slippy/dist/rules/no-duplicate-imports.js

A simple but powerful linter for Solidity

import { NonterminalKind, TerminalKind } from "@nomicfoundation/slang/cst";
export const NoDuplicateImports = {
    name: "no-duplicate-imports",
    recommended: true,
    create: function () {
        return new NoDuplicateImportsRule(this.name);
    },
};
class NoDuplicateImportsRule {
    constructor(name) {
        this.name = name;
    }
    run({ file }) {
        const diagnostics = [];
        const cursor = file.createTreeCursor();
        const importPaths = new Set();
        while (cursor.goToNextNonterminalWithKind(NonterminalKind.ImportDirective)) {
            const importPathCursor = cursor.spawn();
            if (!importPathCursor.goToNextNonterminalWithKind(NonterminalKind.StringLiteral)) {
                continue;
            }
            const importPath = importPathCursor.node.unparse().trim().slice(1, -1);
            const importKeywordCursor = cursor.spawn();
            if (!importKeywordCursor.goToNextTerminalWithKind(TerminalKind.ImportKeyword)) {
                continue;
            }
            if (importPaths.has(importPath)) {
                diagnostics.push({
                    sourceId: file.id,
                    rule: this.name,
                    message: `Duplicate import of '${importPath}'`,
                    line: importKeywordCursor.textRange.start.line,
                    column: importKeywordCursor.textRange.start.column,
                });
            }
            else {
                importPaths.add(importPath);
            }
        }
        return diagnostics;
    }
}
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