Function buildRollupDts

Gulpfile.ts:693–778

(
  input: string,
  output: string,
  banner: string,
  packageName: string
)

}

async function buildRollupDts(
  input: string,
  output: string,
  banner: string,
  packageName: string
) {
  log(`Bundling '${styleText("cyan", output)}' with rollup ...`);

  let external;
  let imports;
  if (packageName) {
    const pkgJSON = require("./" + packageName + "/package.json");
    const {
      dependencies = {},
      devDependencies = {},
      peerDependencies = {},
    } = pkgJSON;
    external = [
      ...Object.keys(dependencies),
      ...Object.keys(peerDependencies),
      // TODO: These should all be moved to dependencies
      ...Object.keys(devDependencies),
    ].map(dep => new RegExp(`^${dep}(?:/.+)?$`));

    imports = pkgJSON.imports;
  }

  const bundle = await rollup({
    input,
    plugins: (
      [
        {
          name: "rollup-babel-internal-define-BABEL_8_BREAKING",
          transform: code =>
            code.replace(
              /type BABEL_8_BREAKING\s*=\s*boolean/g,
              `type BABEL_8_BREAKING = true`
            ),
        },
        rollupDts(),
        imports && {
          name: "resolve-dts-package.json-imports",
          resolveId: {
            order: "post",
            handler(importee: string, importer: string | undefined) {
              if (importer && importee.startsWith("#")) {
                const mapped = imports?.[importee]?.types?.replace(
                  "/lib/",
                  "/src/"
                );
                if (mapped) {
                  return require.resolve(`./dts/${packageName}/${mapped}`);
                }
                return null;
              }
            },
          },
        },