create-local-lambda-event-data.ts

const fs = require('fs');

const GRAPHQL_DATA_JSON = './.graphql-data.json';

if (!fs.existsSync(GRAPHQL_DATA_JSON)) {
  const GRAPHQL_DATA_TEMPLATE = {
    operationName: null,
    variables: {},
    query: '{ hello nodeVersion }'
  };

  let lambdaDataJson = JSON.stringify(GRAPHQL_DATA_TEMPLATE, null, 2);

  fs.writeFileSync(GRAPHQL_DATA_JSON, lambdaDataJson);
}

const eventData = require(GRAPHQL_DATA_JSON);

const lambdaEvent = {
  body: JSON.stringify(eventData),
  httpMethod: 'POST',
  headers: {
    'content-type': 'application/json'
  }
};

const lambdaDataJson = JSON.stringify(lambdaEvent, null, 2);

fs.writeFileSync('.lambda-event-data.json', lambdaDataJson);