TSTypeInfo

Reflection and code generation in TypeScript.

Uses the TypeScript Compiler API to get the type and structure information of TypeScript code in an easily usable format.

npm install ts-type-info --save-dev
tsd link

Reflection

// V:/TestFile.ts

function myDecorator(str: string) {
    return (target: typeof MyClass) => {
        target.myStaticProperty = str;
    };
}

@myDecorator("My decorator value")
export class MyClass {
    static myStaticProperty: string | number;

    myProperty = 253;

    myMethod(myParameter: string) {
        return `Test: ${myParameter}`;
    }
}

Get the file info:

import * as TsTypeInfo from "ts-type-info";

const files = TsTypeInfo.getFileInfo(["V:/TestFile.ts"]);
const myPropertyName = files[0].classes[0].properties[0].name;

console.log(myPropertyName); // myProperty

Code Generation

// V:/TestFile2.ts

class MyClass {
    myMethod(str: string) {
    }
}

Get the file info and tell it how it should output:

import * as TsTypeInfo from "ts-type-info";

const files = TsTypeInfo.getFileInfo(["V:/TestFile2.ts"]);
const myClass = files[0].classes[0];

myClass.isAbstract = true;
myClass.onBeforeWrite = writer => writer.write("@MyDecorator");
myClass.methods[0].onBeforeWrite = writer => writer.write("// myMethod is here");
myClass.methods[0].onWriteFunctionBody = writer => {
    writer.write(`if (str != null && str.length > 40)`).block(() => {
        writer.write("alert(str)");
    });
    writer.newLine().write("return str;");
};

console.log(myClass.write());

Outputs:

@MyDecorator
abstract class MyClass {
    // myMethod is here
    myMethod(str: string) {
        if (str != null && str.length > 40) {
            alert(str);
        }

        return str;
    }
}

Real Life Example

• Server Bridge - Automatically generates client side code to communicate with the server from the server side code.