/
prefer-spy-on.js
69 lines (59 loc) · 1.77 KB
/
prefer-spy-on.js
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'use strict';
const { getDocsUrl, getNodeName } = require('./util');
const getJestFnCall = node => {
if (
(node.type !== 'CallExpression' && node.type !== 'MemberExpression') ||
(node.callee && node.callee.type !== 'MemberExpression')
) {
return null;
}
const obj = node.callee ? node.callee.object : node.object;
if (obj.type === 'Identifier') {
return node.type === 'CallExpression' &&
getNodeName(node.callee) === 'jest.fn'
? node
: null;
}
return getJestFnCall(obj);
};
module.exports = {
meta: {
docs: {
url: getDocsUrl(__filename),
},
fixable: 'code',
},
create(context) {
return {
AssignmentExpression(node) {
if (node.left.type !== 'MemberExpression') return;
const jestFnCall = getJestFnCall(node.right);
if (!jestFnCall) return;
context.report({
node,
message: 'Use jest.spyOn() instead.',
fix(fixer) {
const leftPropQuote =
node.left.property.type === 'Identifier' ? "'" : '';
const [arg] = jestFnCall.arguments;
const argSource = arg && context.getSourceCode().getText(arg);
const mockImplementation = argSource
? `.mockImplementation(${argSource})`
: '';
return [
fixer.insertTextBefore(node.left, `jest.spyOn(`),
fixer.replaceTextRange(
[node.left.object.range[1], node.left.property.range[0]],
`, ${leftPropQuote}`,
),
fixer.replaceTextRange(
[node.left.property.range[1], jestFnCall.range[1]],
`${leftPropQuote})${mockImplementation}`,
),
];
},
});
},
};
},
};