tsup-plugin-prepend-directive/dist/index.js

A tsup plugin that allows users to specify directives to be explicitly prepended to build files.

// src/index.ts
import { readFileSync, writeFileSync } from "fs";
function prependDirective(directive, filePatterns) {
  if (!Array.isArray(filePatterns)) {
    throw Error("FilePatterns given to prependDirective plugin must be an array.");
  }
  return {
    name: "prepend-directive",
    // At the end of the build step, directly prepend the specified directive to files with specified pattern
    buildEnd(ctx) {
      for (const file of ctx.writtenFiles) {
        for (const filePattern of filePatterns) {
          if (file.name.startsWith(filePattern)) {
            const fileContent = readFileSync(file.name, "utf8");
            writeFileSync(file.name, `${directive};${fileContent}`);
            console.log(`Prepended ${directive} directive to ${file.name}`);
          }
        }
      }
    }
  };
}
export {
  prependDirective
};