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

Answer 1

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