build.js

const { build } = require('esbuild');
const replace = require('replace-in-file');
const fs = require('fs');
const package = require("./package.json");
(async () => {
  let contractFunctions = fs.readdirSync('./src/functions/').map(contractFunction => contractFunction.slice(0, -(`.js`).length))
  let contractFunctionsContents = contractFunctions.map(cf => fs.readFileSync("./src/functions/" + cf + ".js").toString())
  let contractFunctionsDescriptions = contractFunctionsContents.map(cnt => extractDescription(cnt))
  let specmd = `# ${package.name} v${package.version}\n\n${package.description}\n\n` +
    contractFunctions.map((cf, cfi) => `\`${cf}\` \n
> ${contractFunctionsDescriptions[cfi]}\n`).join("\n")
  fs.writeFileSync("./SPEC.md", specmd)
  let contractCode = `//THIS FILE IS AUTOGENERATED BY build.js, PLEASE DO NOT EDIT IT
  export async function handle(state, action) {
  if (!action.input || typeof action.input !== "object" || typeof action.input.function !== "string") {
    throw new ContractError("Invalid input");
  }

  const functionMap = {
${contractFunctions.map(cf => "\"" + cf + "\":require(\"./functions/" + cf + ".js\")").join(",\n")}
  };

  const selectedFunction = functionMap[action.input.function];
  if (!selectedFunction) {
    throw new ContractError(\`Function '\${action.input.function}' not found\`);
  }

  try {
    return await selectedFunction(state, action, handle);
  } catch (error) {
    throw new ContractError(\`Error executing function '\${action.input.function}': \${ error.message }\`);
  }
}
`
  fs.writeFileSync("./src/contract.js", contractCode)
  const contracts = ['/contract.js'];

  // Build and bundle the contract code
  build({
    entryPoints: ["./src/contract.js"],
    outdir: './dist',
    minify: false,
    bundle: true,
    format: 'iife',
  })
    .catch(() => process.exit(1))
    // Note: Warp SDK currently does not support files in IIFE bundle format, so we need to remove the "iife" part ;-)
    // Update: it does since 0.4.31, but because viewblock.io is still incompatible with this version, leaving as is for now.
    .finally(() => {
      // Remove the "iife" part from the bundled file
      const files = contracts.map((source) => {
        return `./dist${source}`.replace('.ts', '.js');
      });
      replace.sync({
        files: files,
        from: [/\(\(\) => {/g, /}\)\(\);/g],
        to: '',
        countMatches: true,
      });
    });
})()



function extractDescription(functionCode) {
  let descRegex = /(?<=\/\*function\-description)(.*?)(?=function-description\*\/)/s
  let res = descRegex.exec(functionCode)
  if (!res) { return "" }
  return res[0].trim()
}