Function getParameterIdentifierNameAtPosition

test/fixtures/snapshot/typescript.js:77493–77522

(signature, pos)

            return restParameter.escapedName;
        }
        function getParameterIdentifierNameAtPosition(signature, pos) {
            var _a;
            if (((_a = signature.declaration) === null || _a === void 0 ? void 0 : _a.kind) === 317 /* SyntaxKind.JSDocFunctionType */) {
                return undefined;
            }
            var paramCount = signature.parameters.length - (signatureHasRestParameter(signature) ? 1 : 0);
            if (pos < paramCount) {
                var param = signature.parameters[pos];
                return isParameterDeclarationWithIdentifierName(param) ? [param.escapedName, false] : undefined;
            }
            var restParameter = signature.parameters[paramCount] || unknownSymbol;
            if (!isParameterDeclarationWithIdentifierName(restParameter)) {
                return undefined;
            }
            var restType = getTypeOfSymbol(restParameter);
            if (isTupleType(restType)) {
                var associatedNames = restType.target.labeledElementDeclarations;
                var index = pos - paramCount;
                var associatedName = associatedNames === null || associatedNames === void 0 ? void 0 : associatedNames[index];
                var isRestTupleElement = !!(associatedName === null || associatedName === void 0 ? void 0 : associatedName.dotDotDotToken);
                return associatedName ? [
                    getTupleElementLabel(associatedName),
                    isRestTupleElement
                ] : undefined;
            }
            if (pos === paramCount) {
                return [restParameter.escapedName, true];
            }
            return undefined;
        }
        function isParameterDeclarationWithIdentifierName(symbol) {
            return symbol.valueDeclaration && ts.isParameter(symbol.valueDeclaration) && ts.isIdentifier(symbol.valueDeclaration.name);
        }