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prefer-to-have-length.ts
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prefer-to-have-length.ts
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import { AST_NODE_TYPES } from '@typescript-eslint/experimental-utils';
import {
createRule,
isExpectCall,
isParsedEqualityMatcherCall,
isSupportedAccessor,
parseExpectCall,
} from './utils';
export default createRule({
name: __filename,
meta: {
docs: {
category: 'Best Practices',
description: 'Suggest using `toHaveLength()`',
recommended: false,
},
messages: {
useToHaveLength: 'Use toHaveLength() instead',
},
fixable: 'code',
type: 'suggestion',
schema: [],
},
defaultOptions: [],
create(context) {
return {
CallExpression(node) {
if (!isExpectCall(node)) {
return;
}
const {
expect: {
arguments: [argument],
},
matcher,
} = parseExpectCall(node);
if (
!matcher ||
!isParsedEqualityMatcherCall(matcher) ||
!argument ||
argument.type !== AST_NODE_TYPES.MemberExpression ||
!isSupportedAccessor(argument.property, 'length') ||
argument.property.type !== AST_NODE_TYPES.Identifier
) {
return;
}
context.report({
fix(fixer) {
const propertyDot = context
.getSourceCode()
.getFirstTokenBetween(
argument.object,
argument.property,
token => token.value === '.',
);
/* istanbul ignore if */
if (propertyDot === null) {
throw new Error(
`Unexpected null when attempting to fix ${context.getFilename()} - please file a github issue at https://github.com/jest-community/eslint-plugin-jest`,
);
}
return [
fixer.remove(propertyDot),
fixer.remove(argument.property),
fixer.replaceText(matcher.node.property, 'toHaveLength'),
];
},
messageId: 'useToHaveLength',
node: matcher.node.property,
});
},
};
},
});