vite-plugin-custom-functions-metadata/src/index.ts

Vite plugin to generate metadata for custom excel functions

import { Plugin, ResolvedConfig } from "vite";
import { generateCustomFunctionsMetadata } from "custom-functions-metadata";
import { writeFileSync } from "fs";

interface Configuration {
  inputFile: string;
  outputFile: string;
}

export default function customFunctionsMetadata(config: Configuration): Plugin {
  let viteConfig: ResolvedConfig;

  const { inputFile, outputFile } = config;

  const generateMetadata = async (input: string, output: string) => {
    const results = await generateCustomFunctionsMetadata(input);
    if (results.errors.length === 0) {
      try {
        writeFileSync(output, results.metadataJson);
      } catch {
        throw new Error(`Cannot write metadata to file: ${output}`);
      }
    }
  };

  return {
    name: "custom-function-metadata",
    configResolved(config) {
      viteConfig = config;
    },
    async buildStart() {
      generateMetadata(inputFile, outputFile);
    },
    configureServer(server) {
      const listener = async (filePath: string) => {
        if (filePath === inputFile) {
          generateMetadata(inputFile, outputFile);
        }
      };

      server.watcher.on("change", listener);
    },
  };
}