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Improved argument description for parameters originating from tuples that were extracted from functions. (ie mapped functions)

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Titian Cernicova-Dragomir
2019-02-25 18:18:00 +02:00
parent c37254e509
commit 8d66d55de1
4 changed files with 69 additions and 2 deletions
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13
src/services/signatureHelp.ts
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@@ -566,7 +566,7 @@ namespace ts.SignatureHelp {
}
function itemInfoForParameters(candidateSignature: Signature, checker: TypeChecker, enclosingDeclaration: Node, sourceFile: SourceFile): SignatureHelpItemInfo {
const isVariadic = candidateSignature.hasRestParameter;
let isVariadic = candidateSignature.hasRestParameter;
const printer = createPrinter({ removeComments: true });
const typeParameterParts = mapToDisplayParts(writer => {
if (candidateSignature.typeParameters && candidateSignature.typeParameters.length) {
@@ -574,7 +574,16 @@ namespace ts.SignatureHelp {
printer.writeList(ListFormat.TypeParameters, args, sourceFile, writer);
}
});
const parameters = candidateSignature.parameters.map(p => createSignatureHelpParameterForParameter(p, checker, enclosingDeclaration, sourceFile, printer));
const expandedParameters = checker.getExpandedParameters(candidateSignature);
const parameters = expandedParameters.map(p => createSignatureHelpParameterForParameter(p, checker, enclosingDeclaration, sourceFile, printer));
// If parameters are not the same as the expanded parameters, we need to reevaluate whether this a variadic signature based on the last parameter
if (expandedParameters !== candidateSignature.parameters) {
const restCandidate = lastOrUndefined(expandedParameters);
isVariadic = !!restCandidate && !!(getCheckFlags(restCandidate) & CheckFlags.RestParameter);
}
return { isVariadic, parameters, prefix: [...typeParameterParts, punctuationPart(SyntaxKind.OpenParenToken)], suffix: [punctuationPart(SyntaxKind.CloseParenToken)] };
}