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Contextual this in 'obj.xxx = function(...)' or 'obj[xxx] = function(...)'

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This commit is contained in:
Anders Hejlsberg 2017-02-17 06:56:58 -08:00
parent 27346b13d0
commit e3a0687327
1 changed files with 8 additions and 0 deletions
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8
src/compiler/checker.ts
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@ -11518,6 +11518,14 @@ namespace ts {
// for 'this' is the type of the object literal itself.
return checkExpressionCached(containingLiteral);
}
// In an assignment of the form 'obj.xxx = function(...)' or 'obj[xxx] = function(...)', the
// contextual type for 'this' is 'obj'.
if (func.parent.kind === SyntaxKind.BinaryExpression && (<BinaryExpression>func.parent).operatorToken.kind === SyntaxKind.EqualsToken) {
const target = (<BinaryExpression>func.parent).left;
if (target.kind === SyntaxKind.PropertyAccessExpression || target.kind === SyntaxKind.ElementAccessExpression) {
return checkExpressionCached((<PropertyAccessExpression | ElementAccessExpression>target).expression);
}
}
}
return undefined;
}