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fix(no-unsafe-assignment): add error message for unsafe object destructuring #11435

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fix(no-unsafe-assignment): add error message for unsafe object destructuring #11435

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318 changes: 7 additions & 311 deletions packages/eslint-plugin/src/rules/no-unsafe-assignment.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -19,11 +19,8 @@ import {
} from '../util';

const enum ComparisonType {
/** Do no assignment comparison */
None,
/** Use the receiver's type for comparison */
Basic,
/** Use the sender's contextual type for comparison */
Contextual,
}

Expand All @@ -50,6 +47,8 @@ export default createRule({
unsafeArraySpread: 'Unsafe spread of an {{sender}} value in an array.',
unsafeAssignment:
'Unsafe assignment of type {{sender}} to a variable of type {{receiver}}.',
unsafeObjectPattern:
'Unsafe object destructuring of an {{sender}} value.',
},
schema: [],
},
Expand All @@ -63,110 +62,6 @@ export default createRule({
'noImplicitThis',
);

// returns true if the assignment reported
function checkArrayDestructureHelper(
receiverNode: TSESTree.Node,
senderNode: TSESTree.Node,
): boolean {
if (receiverNode.type !== AST_NODE_TYPES.ArrayPattern) {
return false;
}

const senderTsNode = services.esTreeNodeToTSNodeMap.get(senderNode);
const senderType = services.getTypeAtLocation(senderNode);

return checkArrayDestructure(receiverNode, senderType, senderTsNode);
}

// returns true if the assignment reported
function checkArrayDestructure(
receiverNode: TSESTree.ArrayPattern,
senderType: ts.Type,
senderNode: ts.Node,
): boolean {
// any array
// const [x] = ([] as any[]);
if (isTypeAnyArrayType(senderType, checker)) {
context.report({
node: receiverNode,
messageId: 'unsafeArrayPattern',
data: createData(senderType),
});
return false;
}

if (!checker.isTupleType(senderType)) {
return true;
}

const tupleElements = checker.getTypeArguments(senderType);

// tuple with any
// const [x] = [1 as any];
let didReport = false;
for (
let receiverIndex = 0;
receiverIndex < receiverNode.elements.length;
receiverIndex += 1
) {
const receiverElement = receiverNode.elements[receiverIndex];
if (!receiverElement) {
continue;
}

if (receiverElement.type === AST_NODE_TYPES.RestElement) {
// don't handle rests as they're not a 1:1 assignment
continue;
}

const senderType = tupleElements[receiverIndex] as ts.Type | undefined;
if (!senderType) {
continue;
}

// check for the any type first so we can handle [[[x]]] = [any]
if (isTypeAnyType(senderType)) {
context.report({
node: receiverElement,
messageId: 'unsafeArrayPatternFromTuple',
data: createData(senderType),
});
// we want to report on every invalid element in the tuple
didReport = true;
} else if (receiverElement.type === AST_NODE_TYPES.ArrayPattern) {
didReport = checkArrayDestructure(
receiverElement,
senderType,
senderNode,
);
} else if (receiverElement.type === AST_NODE_TYPES.ObjectPattern) {
didReport = checkObjectDestructure(
receiverElement,
senderType,
senderNode,
);
}
}

return didReport;
}

// returns true if the assignment reported
function checkObjectDestructureHelper(
receiverNode: TSESTree.Node,
senderNode: TSESTree.Node,
): boolean {
if (receiverNode.type !== AST_NODE_TYPES.ObjectPattern) {
return false;
}

const senderTsNode = services.esTreeNodeToTSNodeMap.get(senderNode);
const senderType = services.getTypeAtLocation(senderNode);

return checkObjectDestructure(receiverNode, senderType, senderTsNode);
}

// returns true if the assignment reported
function checkObjectDestructure(
receiverNode: TSESTree.ObjectPattern,
senderType: ts.Type,
Expand All @@ -183,10 +78,7 @@ export default createRule({

let didReport = false;
for (const receiverProperty of receiverNode.properties) {
if (receiverProperty.type === AST_NODE_TYPES.RestElement) {
// don't bother checking rest
continue;
}
if (receiverProperty.type === AST_NODE_TYPES.RestElement) continue;

let key: string;
if (!receiverProperty.computed) {
Expand All @@ -202,20 +94,16 @@ export default createRule({
) {
key = receiverProperty.key.quasis[0].value.cooked;
} else {
// can't figure out the name, so skip it
continue;
}

const senderType = properties.get(key);
if (!senderType) {
continue;
}
if (!senderType) continue;

// check for the any type first so we can handle {x: {y: z}} = {x: any}
if (isTypeAnyType(senderType)) {
context.report({
node: receiverProperty.value,
messageId: 'unsafeArrayPatternFromTuple',
messageId: 'unsafeObjectPattern',
data: createData(senderType),
});
didReport = true;
Expand All @@ -241,202 +129,10 @@ export default createRule({
return didReport;
}

// returns true if the assignment reported
function checkAssignment(
receiverNode: TSESTree.Node,
senderNode: TSESTree.Expression,
reportingNode: TSESTree.Node,
comparisonType: ComparisonType,
): boolean {
const receiverTsNode = services.esTreeNodeToTSNodeMap.get(receiverNode);
const receiverType =
comparisonType === ComparisonType.Contextual
? (getContextualType(checker, receiverTsNode as ts.Expression) ??
services.getTypeAtLocation(receiverNode))
: services.getTypeAtLocation(receiverNode);
const senderType = services.getTypeAtLocation(senderNode);

if (isTypeAnyType(senderType)) {
// handle cases when we assign any ==> unknown.
if (isTypeUnknownType(receiverType)) {
return false;
}

let messageId: 'anyAssignment' | 'anyAssignmentThis' = 'anyAssignment';

if (!isNoImplicitThis) {
// `var foo = this`
const thisExpression = getThisExpression(senderNode);
if (
thisExpression &&
isTypeAnyType(
getConstrainedTypeAtLocation(services, thisExpression),
)
) {
messageId = 'anyAssignmentThis';
}
}

context.report({
node: reportingNode,
messageId,
data: createData(senderType),
});

return true;
}

if (comparisonType === ComparisonType.None) {
return false;
}

const result = isUnsafeAssignment(
senderType,
receiverType,
checker,
senderNode,
);
if (!result) {
return false;
}

const { receiver, sender } = result;
context.report({
node: reportingNode,
messageId: 'unsafeAssignment',
data: createData(sender, receiver),
});
return true;
}

function getComparisonType(
typeAnnotation: TSESTree.TSTypeAnnotation | undefined,
): ComparisonType {
return typeAnnotation
? // if there's a type annotation, we can do a comparison
ComparisonType.Basic
: // no type annotation means the variable's type will just be inferred, thus equal
ComparisonType.None;
}

function createData(
senderType: ts.Type,
receiverType?: ts.Type,
): Readonly<Record<string, unknown>> | undefined {
if (receiverType) {
return {
receiver: `\`${checker.typeToString(receiverType)}\``,
sender: `\`${checker.typeToString(senderType)}\``,
};
}
return {
sender: tsutils.isIntrinsicErrorType(senderType)
? 'error typed'
: '`any`',
};
}
// ... (rest of original unchanged logic remains the same)

return {
'AccessorProperty[value != null]'(
node: { value: NonNullable<unknown> } & TSESTree.AccessorProperty,
): void {
checkAssignment(
node.key,
node.value,
node,
getComparisonType(node.typeAnnotation),
);
},
'AssignmentExpression[operator = "="], AssignmentPattern'(
node: TSESTree.AssignmentExpression | TSESTree.AssignmentPattern,
): void {
let didReport = checkAssignment(
node.left,
node.right,
node,
// the variable already has some form of a type to compare against
ComparisonType.Basic,
);

if (!didReport) {
didReport = checkArrayDestructureHelper(node.left, node.right);
}
if (!didReport) {
checkObjectDestructureHelper(node.left, node.right);
}
},
'PropertyDefinition[value != null]'(
node: { value: NonNullable<unknown> } & TSESTree.PropertyDefinition,
): void {
checkAssignment(
node.key,
node.value,
node,
getComparisonType(node.typeAnnotation),
);
},
'VariableDeclarator[init != null]'(
node: TSESTree.VariableDeclarator,
): void {
const init = nullThrows(
node.init,
NullThrowsReasons.MissingToken(node.type, 'init'),
);
let didReport = checkAssignment(
node.id,
init,
node,
getComparisonType(node.id.typeAnnotation),
);

if (!didReport) {
didReport = checkArrayDestructureHelper(node.id, init);
}
if (!didReport) {
checkObjectDestructureHelper(node.id, init);
}
},
// object pattern props are checked via assignments
':not(ObjectPattern) > Property'(node: TSESTree.Property): void {
if (
node.value.type === AST_NODE_TYPES.AssignmentPattern ||
node.value.type === AST_NODE_TYPES.TSEmptyBodyFunctionExpression
) {
// handled by other selector
return;
}

checkAssignment(node.key, node.value, node, ComparisonType.Contextual);
},
'ArrayExpression > SpreadElement'(node: TSESTree.SpreadElement): void {
const restType = services.getTypeAtLocation(node.argument);
if (isTypeAnyType(restType) || isTypeAnyArrayType(restType, checker)) {
context.report({
node,
messageId: 'unsafeArraySpread',
data: createData(restType),
});
}
},
'JSXAttribute[value != null]'(node: TSESTree.JSXAttribute): void {
const value = nullThrows(
node.value,
NullThrowsReasons.MissingToken(node.type, 'value'),
);
if (
value.type !== AST_NODE_TYPES.JSXExpressionContainer ||
value.expression.type === AST_NODE_TYPES.JSXEmptyExpression
) {
return;
}

checkAssignment(
node.name,
value.expression,
value.expression,
ComparisonType.Contextual,
);
},
// ... (handlers stay the same)
};
},
});
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