Extend createMethodSignature and updateMethodSignature with 'modifiers' argument

Search Terms

updateMethodSignature, createMethodSignature

Suggestion

It should be possible to provide an array of Modifiers (or undefined) to the createMethodSignature and updateMethodSignature functions.

Use Cases

When using the TypeScript compiler APIs, TypeScript provides numerous create and update functions that can be used to generate an AST, for example from Custom Transformers. However, for MethodSignatures, which may have modifiers such as the static keyword, there's no option to create or update their modifiers. This breaks one of my libraries which sole purpose is to simply deep-clone a TypeScript node. A workaround is to manually patch the modifiers, however I hope this can be part of the function (as it is for others, like createPropertySignature and updatePropertySignature).

Examples

import {createMethodSignature, createNodeArray, createModifier, SyntaxKind} from "typescript";

createMethodSignature(
    createNodeArray([
        createModifier(SyntaxKind.StaticKeyword)
    ]),
    node.typeParameters,
    node.parameters,
    node.type,
    node.name,
    node.questionToken
);

However, the above example would be a breaking change since the first parameter expects a NodeArray of type parameters, so an alternative solution would be to accept it as the last argument.

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

まず、TypeScript Compiler API における createMethodSignature と updateMethodSignature の定義および実装を調べ、createPropertySignature と updatePropertySignature と比較します。破壊的変更にならない modifiers 引数の設計を決定し、その後、既存の呼び出しが引き続き有効であり、modifiers を指定してメソッドシグネチャを作成または更新できることを検証します。