这最初是作为https://github.com/microsoft/TypeScript/pull/44648/files的一部分实施的，但被删除以保持PR的重点，并允许对此进行单独讨论。

function getSuggestedSymbolForNonexistentProperty(propertyName: Identifier | PrivateIdentifier | string, containingType: Type): Symbol | undefined {
    let props = getPropertiesOfType(containingType);
    let name: string;
    if (typeof propertyName === "string") {
        name = propertyName;
    }
    else {
        name = idText(propertyName);
        const parent = propertyName.parent;
        if (isPropertyAccessExpression(parent)) {
            props = filter(props, prop => isValidPropertyAccessForCompletions(parent, containingType, prop));
        }
    }
    const suggestion = getSpellingSuggestionForName(name, props, SymbolFlags.Value);
    if (suggestion) {
        return suggestion;
    }

    // New logic:
    if (typeof propertyName !== "string" && isPrivateIdentifier(propertyName)) {
        const privateIdentifiers: Symbol[] = [];
        forEachEnclosingClass(propertyName, (klass: ClassLikeDeclaration) => {
            forEach(klass.members, member => {
                if (isPrivateIdentifierClassElementDeclaration(member)) {
                    privateIdentifiers.push(member.symbol);
                }
            });
        });
        return getSpellingSuggestionForName(name, privateIdentifiers, SymbolFlags.Value);
    }
    return undefined;
}