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no-large-snapshots.ts
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no-large-snapshots.ts
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import { isAbsolute } from 'path';
import {
AST_NODE_TYPES,
TSESLint,
TSESTree,
} from '@typescript-eslint/experimental-utils';
import {
createRule,
getAccessorValue,
isExpectCall,
isExpectMember,
parseExpectCall,
} from './utils';
interface RuleOptions {
maxSize?: number;
inlineMaxSize?: number;
allowedSnapshots?: Record<string, Array<string | RegExp>>;
}
type MessageId = 'noSnapshot' | 'tooLongSnapshots';
type RuleContext = TSESLint.RuleContext<MessageId, [RuleOptions]>;
const reportOnViolation = (
context: RuleContext,
node: TSESTree.CallExpression | TSESTree.ExpressionStatement,
{ maxSize: lineLimit = 50, allowedSnapshots = {} }: RuleOptions,
) => {
const startLine = node.loc.start.line;
const endLine = node.loc.end.line;
const lineCount = endLine - startLine;
const allPathsAreAbsolute = Object.keys(allowedSnapshots).every(isAbsolute);
if (!allPathsAreAbsolute) {
throw new Error(
'All paths for allowedSnapshots must be absolute. You can use JS config and `path.resolve`',
);
}
let isAllowed = false;
if (
node.type === AST_NODE_TYPES.ExpressionStatement &&
'left' in node.expression &&
isExpectMember(node.expression.left)
) {
const fileName = context.getFilename();
const allowedSnapshotsInFile = allowedSnapshots[fileName];
if (allowedSnapshotsInFile) {
const snapshotName = getAccessorValue(node.expression.left.property);
isAllowed = allowedSnapshotsInFile.some(name => {
if (name instanceof RegExp) {
return name.test(snapshotName);
}
return snapshotName === name;
});
}
}
if (!isAllowed && lineCount > lineLimit) {
context.report({
messageId: lineLimit === 0 ? 'noSnapshot' : 'tooLongSnapshots',
data: { lineLimit, lineCount },
node,
});
}
};
export default createRule<[RuleOptions], MessageId>({
name: __filename,
meta: {
docs: {
category: 'Best Practices',
description: 'disallow large snapshots',
recommended: false,
},
messages: {
noSnapshot: '`{{ lineCount }}`s should begin with lowercase',
tooLongSnapshots:
'Expected Jest snapshot to be smaller than {{ lineLimit }} lines but was {{ lineCount }} lines long',
},
type: 'suggestion',
schema: [
{
type: 'object',
properties: {
maxSize: {
type: 'number',
},
inlineMaxSize: {
type: 'number',
},
allowedSnapshots: {
type: 'object',
additionalProperties: { type: 'array' },
},
},
additionalProperties: false,
},
],
},
defaultOptions: [{}],
create(context, [options]) {
if (context.getFilename().endsWith('.snap')) {
return {
ExpressionStatement(node) {
reportOnViolation(context, node, options);
},
};
}
return {
CallExpression(node) {
if (!isExpectCall(node)) {
return;
}
const { matcher } = parseExpectCall(node);
if (matcher?.node.parent?.type !== AST_NODE_TYPES.CallExpression) {
return;
}
if (
[
'toMatchInlineSnapshot',
'toThrowErrorMatchingInlineSnapshot',
].includes(matcher.name)
) {
reportOnViolation(context, matcher.node.parent, {
...options,
maxSize: options.inlineMaxSize ?? options.maxSize,
});
}
},
};
},
});