などで TypeScript, JavaScript のコードを生成したかったので作った
- 入力値は, 構造化されているので TypeScript の AST(抽象構文木)とは違う
- 出力した形式は人間にも読みやすい
- Deno でもブラウザでも動く
- 予約語はあまり気にしなくて良い
- 対応している構文は一部だけ
Deno, ブラウザ, 両方対応
import {
exportDefinitionFunction,
generateCodeAsString,
identifierFromString,
type Module,
} from "jsr:@narumincho/js-ts-code-generator";
import * as statement from "jsr:@narumincho/js-ts-code-generator/statement";
import * as type from "jsr:@narumincho/js-ts-code-generator/type";
import * as expr from "jsr:@narumincho/js-ts-code-generator/expr";
const serverModule: Module = {
definitionList: [
exportDefinitionFunction({
export: true,
isAsync: false,
name: identifierFromString("middleware"),
document: "ミドルウェア",
typeParameterList: [],
parameterList: [
{
name: identifierFromString("request"),
document: "リクエスト",
type: ({
type: "ImportedType",
importedType: {
moduleName: "express",
nameAndArguments: {
name: identifierFromString("Request"),
arguments: [],
},
},
}),
},
{
name: identifierFromString("response"),
document: "レスポンス",
type: ({
type: "ImportedType",
importedType: {
moduleName: "express",
nameAndArguments: {
name: identifierFromString("Response"),
arguments: [],
},
},
}),
},
],
returnType: { type: "Void" },
statementList: [
statement.variableDefinition({
isConst: true,
name: identifierFromString("accept"),
type: type.union([{ type: "String" }, { type: "Undefined" }]),
expr: expr.get(
expr.get(
expr.variable(identifierFromString("request")),
"headers",
),
"accept",
),
}),
statement.if({
condition: expr.logicalAnd(
expr.notEqual(
expr.variable(identifierFromString("accept")),
{ type: "UndefinedLiteral" },
),
expr.callMethod(
expr.variable(identifierFromString("accept")),
"includes",
[expr.stringLiteral("text/html")],
),
),
thenStatementList: [
statement.evaluateExpr(
expr.callMethod(
expr.variable(identifierFromString("response")),
"setHeader",
[
expr.stringLiteral("content-type"),
expr.stringLiteral("text/html"),
],
),
),
],
}),
],
}),
],
statementList: [],
};
const codeAsString = generateCodeAsString({
code: serverModule,
codeType: "TypeScript",
});
console.log(codeAsString);/** generated by
* - https://jsr.io/@narumincho/[email protected]
* Do not edit!
*
* @module
*/
import * as a from "express";
/**
* ミドルウェア
* @param request リクエスト
* @param response レスポンス
*/
export const middleware = (request: a.Request, response: a.Response): void => {
const accept: string | undefined = request.headers.accept;
if (accept !== undefined && accept.includes("text/html")) {
response.setHeader("content-type", "text/html");
}
};