What is the reason behind Typescript flagging the Lambda Handler event as deprecated?

In a TypeScript environment, I am attempting to define a lambda handler.

const sampleFunc = async (event) => {
  console.log('request:', JSON.stringify(event, undefined, 2));
  return {
    statusCode: 200,
    headers: { 'Content-Type': 'text/plain' },
    body: `Hello, CDK! You've hit ${event.path}\n`,
  };
};
exports.handler = sampleFunc(event);

The event parameter is strikethrough due to deprecation, as indicated by the compiler error message:

'event' is deprecated.ts(6385)
lib.dom.d.ts(17314, 5): The declaration was marked as deprecated here.

Interestingly, when the function is defined inline, the code works without any issues.

    exports.handler = async function (event) {
  console.log('request:', JSON.stringify(event, undefined, 2));
  return {
    statusCode: 200,
    headers: { 'Content-Type': 'text/plain' },
    body: `Hello, CDK! You've hit ${event.path}\n`,
  };
};

Answer №1

It seems like the issue lies not in the function definition itself, but rather in how you are exporting it.

Make sure to export the function and not just call it:

Incorrect:

exports.handler = sampleFunc(event);

Correct:

exports.handler = sampleFunc;

You also have the option to directly export the function like this:

exports.handler = async (event) => {
    console.log('request:', JSON.stringify(event, undefined, 2));
    return {
        statusCode: 200,
        headers: { 'Content-Type': 'text/plain' },
        body: `Hello, CDK! You've hit ${event.path}\n`,
    };
};

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