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'use strict';
function isAssert(node) {
return node.expression &&
node.expression.type === 'CallExpression' &&
node.expression.callee &&
node.expression.callee.name === 'assert';
}
function getFirstArg(expression) {
return expression.arguments && expression.arguments[0];
}
function parseError(method, op) {
return `'assert.${method}' should be used instead of '${op}'`;
}
const preferedAssertMethod = {
'===': 'strictEqual',
'!==': 'notStrictEqual',
'==': 'equal',
'!=': 'notEqual'
};
module.exports = function(context) {
return {
ExpressionStatement(node) {
if (isAssert(node)) {
const arg = getFirstArg(node.expression);
if (arg && arg.type === 'BinaryExpression') {
const assertMethod = preferedAssertMethod[arg.operator];
if (assertMethod) {
context.report(node, parseError(assertMethod, arg.operator));
}
}
}
}
};
};
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