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Use '__this__' property in contextual type to indicate type of 'this'

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This commit is contained in:
Anders Hejlsberg 2017-02-14 12:04:39 -08:00
parent f673f48fad
commit f6a3a3fc3d
1 changed files with 13 additions and 0 deletions
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13
src/compiler/checker.ts
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@ -11189,6 +11189,19 @@ namespace ts {
return getTypeOfSymbol(thisParameter);
}
}
if (isObjectLiteralMethod(func)) {
// For methods in an object literal, look for a '__this__' property in the contextual
// type for the object literal. If one exists, remove 'undefined' from the type of that
// property and report it as the contextual type for 'this' in the method.
const objectLiteral = <ObjectLiteralExpression>func.parent;
const type = getApparentTypeOfContextualType(objectLiteral);
if (type) {
const propertyType = getTypeOfPropertyOfContextualType(type, "___this__");
if (propertyType) {
return getNonNullableType(propertyType);
}
}
}
}
return undefined;
}