Is there code generation API for TypeScript?

Question

When I needed to generate some C# code, for example DTO classes from xsd schema, or an excel table, I've used some roslyn API's.

Is there something simmilar for typescript?

[EDIT]: I've end up using ts-morph

I see you've tagged it as T4 -- T4 works fine with any kind of language since it's basically just plain text. Roslyn is VB.NET and C# only. — Jeroen Vannevel
– Jeroen Vannevel, Commented Apr 4, 2016 at 16:25

Brian Leishman · Accepted Answer · 2021-11-16 18:24:15Z

41

Try ts-morph. Only been working with it for about an hour but it seems really capable.

import {Project, Scope, SourceFile} from "ts-morph";

const project = new Project();
const sourceFile = project.createSourceFile(`./target/file.ts`);

const classDeclaration = sourceFile.addClass({
    name: 'SomeClass'
});

const constr = classDeclaration.addConstructor({});

constr.setBodyText('this.myProp = myProp');

classDeclaration.addProperty({
    name: 'myProp',
    type: 'string',
    initializer: 'hello world!',
    scope: Scope.Public
});
sourceFile.formatText();
console.log(sourceFile.getText());

edited Nov 16, 2021 at 18:24

Brian Leishman

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answered Sep 10, 2017 at 7:27

NSjonas

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3 Comments

NSjonas Over a year ago

After working longer with this library I can confirm its the real deal. Still some bugs, but definitely has a lot of promise. The author has really done a great job

Ryall Over a year ago

Still in active development and a very nice API. Thanks for the recommendation

Liero Over a year ago

As an original asker, I can confirm, that I've ended up using ts-morph. I tried the raw typescript compiler api, but it was too low level and I've ended up writing helper functions that did exacatly what ts-morh does.

Michael · Accepted Answer · 2022-07-31 13:14:11Z

as of Oct-2018 You could use standard TypeScript API for that

import ts = require("typescript");

function makeFactorialFunction() {
  const functionName = ts.factory.createIdentifier("factorial");
  const paramName = ts.factory.createIdentifier("n");
  const parameter = ts.factory.createParameterDeclaration(
    /*decorators*/ undefined,
    /*modifiers*/ undefined,
    /*dotDotDotToken*/ undefined,
    paramName
  );

  const condition = ts.factory.createBinaryExpression(
    paramName,
    ts.SyntaxKind.LessThanEqualsToken,
    ts.factory.createNumericLiteral(1)
  );

  const ifBody = ts.factory.createBlock(
    [ts.factory.createReturnStatement(ts.factory.createNumericLiteral(1))],
    /*multiline*/ true
  );
  const decrementedArg = ts.factory.createBinaryExpression(
    paramName,
    ts.SyntaxKind.MinusToken,
    ts.factory.createNumericLiteral(1)
  );
  const recurse = ts.factory.createBinaryExpression(
    paramName,
    ts.SyntaxKind.AsteriskToken,
    ts.factory.createCallExpression(functionName, /*typeArgs*/ undefined, [decrementedArg])
  );
  const statements = [ts.factory.createIfStatement(condition, ifBody), ts.factory.createReturnStatement(recurse)];

  return ts.factory.createFunctionDeclaration(
    /*decorators*/ undefined,
    /*modifiers*/ [ts.factory.createToken(ts.SyntaxKind.ExportKeyword)],
    /*asteriskToken*/ undefined,
    functionName,
    /*typeParameters*/ undefined,
    [parameter],
    /*returnType*/ ts.factory.createKeywordTypeNode(ts.SyntaxKind.NumberKeyword),
    ts.factory.createBlock(statements, /*multiline*/ true)
  );
}

const resultFile = ts.createSourceFile(
  "someFileName.ts",
  "",
  ts.ScriptTarget.Latest,
  /*setParentNodes*/ false,
  ts.ScriptKind.TS
);
const printer = ts.createPrinter({
  newLine: ts.NewLineKind.LineFeed
});
const result = printer.printNode(
  ts.EmitHint.Unspecified,
  makeFactorialFunction(),
  resultFile
);

console.log(result);

Taken here: https://github.com/Microsoft/TypeScript/wiki/Using-the-Compiler-API#user-content-creating-and-printing-a-typescript-ast

basarat · Accepted Answer · 2016-04-04 23:38:47Z

4

Is there something simmilar for typescript

Not yet, but the TypeScript team is opening up the emitter (what is that) for plugins that would make this a supported scenario : https://github.com/Microsoft/TypeScript/issues/5595

answered Apr 4, 2016 at 23:38

basarat

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Comments

Jaider · Accepted Answer · 2019-12-09 04:53:02Z

-7

You can use this tool to generate API in Typescript using swagger. https://github.com/unchase/Unchase.OpenAPI.Connectedservice/

Related: * NSwagStudio

edited Dec 9, 2019 at 4:53

answered Dec 8, 2019 at 0:13

Jaider

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Comments

John Johansen · Accepted Answer · 2018-01-25 19:05:40Z

-9

When we needed to add support for consuming our RESTful APIs to a MEAN stack using Angular 4 and TypeScript, we used http://editor.swagger.io and passed in the JSON version of a Swagger 2.0 API definition, then selected client generator for TypeScript.

Of course we cheated a little, in that we used SZ Architech (http://www.solution.zone) to create the RESTful APIs in the first place, which uses SwaggerUi to document the generated APIs, and allows us to just copy the Swagger 2.0 definition to use Swagger's code generation for the client code.

answered Jan 25, 2018 at 19:05

John Johansen

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