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Better errors for indexing gettable/settable values #26446

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Merged
RyanCavanaugh merged 5 commits into from
Apr 30, 2019
Merged

Better errors for indexing gettable/settable values #26446

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e49b841
give suggestions when index signature given
collin5 Apr 29, 2019
b66fea6
add tests for noImplicitAny indexing on Object
collin5 Apr 29, 2019
a481be7
remove comments regarding error messages
collin5 Apr 29, 2019
5256ff7
recommend set if el is on RHS of assignment else get
collin5 Apr 29, 2019
cab6e04
add new baseline tests
collin5 Apr 29, 2019
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give suggestions when index signature given
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@collin5
collin5 committed Apr 30, 2019
commit e49b841b4d74b390df0bd3a7471f1cc5913d9d89
27 changes: 26 additions & 1 deletion src/compiler/checker.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -10117,7 +10117,13 @@ namespace ts {
}
}
else {
error(accessExpression, Diagnostics.Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature, typeToString(objectType));
const suggestions = getSuggestionsForNonexistentIndexSignature(objectType);
if (suggestions) {
error(accessExpression, Diagnostics.Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature_Did_you_mean_to_call_1, typeToString(objectType), suggestions);
}
else {
error(accessExpression, Diagnostics.Element_implicitly_has_an_any_type_because_type_0_has_no_index_signature, typeToString(objectType));
}
}
}
}
Expand Down Expand Up @@ -20186,6 +20192,25 @@ namespace ts {
return suggestion && symbolName(suggestion);
}

function getSuggestionsForNonexistentIndexSignature(objectType: Type): string | undefined {
let suggestions: string | undefined;
const props = [
getPropertyOfObjectType(objectType, <__String>"get"),
getPropertyOfObjectType(objectType, <__String>"set")
];

for (const prop of props) {
if (prop) {
const s = getSingleCallSignature(getTypeOfSymbol(prop));
if (s && getMinArgumentCount(s) === 1 && typeToString(getTypeAtPosition(s, 0)) === "string") {
const suggestion = symbolToString(objectType.symbol) + "." + symbolToString(prop);
suggestions = (!suggestions) ? suggestion : suggestions.concat(" or " + suggestion);
}
}
}
return suggestions;
}

/**
* Given a name and a list of symbols whose names are *not* equal to the name, return a spelling suggestion if there is one that is close enough.
* Names less than length 3 only check for case-insensitive equality, not levenshtein distance.
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5 changes: 4 additions & 1 deletion src/compiler/diagnosticMessages.json
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Original file line number Diff line number Diff line change
Expand Up @@ -4272,7 +4272,10 @@
"category": "Error",
"code": 7051
},

"Element implicitly has an 'any' type because type '{0}' has no index signature. Did you mean to call '{1}' ?": {
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@DanielRosenwasser DanielRosenwasser Aug 29, 2018 •
edited
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Remove the stray space at the end.

"category": "Error",
"code": 7052
},
"You cannot rename this element.": {
"category": "Error",
"code": 8000
Expand Down