export function readmeCodegen() {
  return `# Welcome to your Convex functions directory!

Write your Convex functions here. See
https://docs.convex.dev/using/writing-convex-functions for more.

A query function that takes two arguments looks like:

\`\`\`typescript
// myQueryFunction.ts
import { query } from "./_generated/server";

export default query(async ({ db }, first: number, second: string) => {
  // Validate arguments here.
  if (typeof first !== 'number' || first < 0) {
    throw new Error("First argument is not a non-negative number.")
  }
  if (typeof second !== 'string' || second.length > 1000) {
    throw new Error("Second argument is not a string of length 1000 or less.");
  }

  // Query the database as many times as you need here.
  // See https://docs.convex.dev/using/database-queries to learn how to write queries.
  const documents = await db.query("tablename").collect();

  // Write arbitrary JavaScript here: filter, aggregate, build derived data,
  // remove non-public properties, or create new objects.
  return documents
});
\`\`\`

Using this query function in a React component looks like:

\`\`\`typescript
const data = useQuery("myQueryFunction", 10, "hello");
\`\`\`


A mutation function looks like:

\`\`\`typescript
// myMutationFunction.ts
import { mutation } from "./_generated/server";

export default mutation(async ({ db }, first: string, second: string) => {
  // Validate arguments here.
  if (typeof first !== 'string' || typeof second !== 'string') {
    throw new Error("Both arguments must be strings");
  }

  // Insert or modify documents in the database here.
  // Mutations can also read from the database like queries.
  const message = { body: first, author: second };
  const id = await db.insert("messages", message);

  // Optionally, return a value from your mutation.
  return await db.get(id);
});
\`\`\`

Using this mutation function in a React component looks like:

\`\`\`typescript
const mutation = useMutation("myMutationFunction");
function handleButtonPress() {
  // fire and forget, the most common way to use mutations
  mutation("Hello!", "me");
  // OR
  // use the result once the mutation has completed
  mutation("Hello!", "me").then(result => console.log(result));
}
\`\`\`

The Convex CLI is your friend. See everything it can do by running
\`npx convex -h\` in your project root directory. To learn more, launch the docs
with \`npx convex docs\`.
`;
}