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index.js
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index.js
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import _checkDuplicateNodes from "../lib/index.js";
import { parseSync, traverse, types as t } from "@babel/core";
const checkDuplicateNodes = _checkDuplicateNodes.default;
describe("checkDuplicateNodes", () => {
it("should throw on duplicate AST nodes within same parent", () => {
const ast = parseSync("{}", {
filename: "example.js",
configFile: false,
});
traverse(ast, {
BlockStatement(path) {
const { node } = path;
const duplicate = t.identifier("ref");
const statementBody = node.body;
statementBody.unshift(
t.variableDeclaration("var", [
t.variableDeclarator(duplicate, duplicate),
]),
);
path.stop();
},
});
expect(() => {
checkDuplicateNodes(ast);
}).toThrowErrorMatchingSnapshot();
});
it("should throw on duplicate AST nodes within different parent", () => {
const ast = parseSync("{}", {
filename: "example.js",
configFile: false,
});
traverse(ast, {
BlockStatement(path) {
const { node } = path;
const duplicate = t.identifier("ref");
const statementBody = node.body;
statementBody.unshift(
t.variableDeclaration("var", [t.variableDeclarator(duplicate)]),
);
statementBody.unshift(
t.expressionStatement(
t.assignmentExpression("=", duplicate, t.nullLiteral()),
),
);
path.stop();
},
});
expect(() => {
checkDuplicateNodes(ast);
}).toThrowErrorMatchingSnapshot();
});
it("should throw when more than one arguments are passed", () => {
expect(() => {
checkDuplicateNodes({}, {});
}).toThrow("checkDuplicateNodes accepts only one argument: ast");
});
});