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/**
* @fileoverview Prohibit the `if (err) throw err;` pattern
* @author Teddy Katz
*/
'use strict';
const utils = require('./rules-utils.js');
module.exports = {
create(context) {
const sourceCode = context.getSourceCode();
let assertImported = false;
function hasSameTokens(nodeA, nodeB) {
const aTokens = sourceCode.getTokens(nodeA);
const bTokens = sourceCode.getTokens(nodeB);
return aTokens.length === bTokens.length &&
aTokens.every((token, index) => {
return token.type === bTokens[index].type &&
token.value === bTokens[index].value;
});
}
function checkAssertNode(node) {
if (utils.isRequired(node, ['assert'])) {
assertImported = true;
}
}
return {
'CallExpression': (node) => checkAssertNode(node),
'IfStatement': (node) => {
const firstStatement = node.consequent.type === 'BlockStatement' ?
node.consequent.body[0] :
node.consequent;
if (
firstStatement &&
firstStatement.type === 'ThrowStatement' &&
hasSameTokens(node.test, firstStatement.argument)
) {
const argument = sourceCode.getText(node.test);
context.report({
node: firstStatement,
message: 'Use assert.ifError({{argument}}) instead.',
data: { argument },
fix: (fixer) => {
if (assertImported) {
return fixer.replaceText(
node,
`assert.ifError(${argument});`
);
}
}
});
}
}
};
}
};
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