Excessively long print times

[tjjfvi]

Here's a small benchmark to demonstrate the issue:

processing file https://cdn.esm.sh/v63/[email protected]/es2021/lodash.js:
    fetching...
        fetch: 151ms
        fetched size: 73KB
    transforming...
        transform: 632ms
        transformed size: 151KB
    parsing...
        parse: 192ms
        parsed size: 3236KB
    printing...
        print: 1949ms
        printed size: 145KB

processing file https://cdn.esm.sh/v63/[email protected]/es2021/typescript.js:
    fetching...
        fetch: 270ms
        fetched size: 3368KB
    transforming...
        transform: 4601ms
        transformed size: 5649KB
    parsing...
        parse: 2317ms
        parsed size: 92196KB
    printing...
        print: 1302059ms
        printed size: 5620KB

Benchmark Source

import { parse, print, transform } from "https://deno.land/x/swc/mod.ts";

for (
  let file of [
    "https://cdn.esm.sh/v63/[email protected]/es2021/lodash.js",
    "https://cdn.esm.sh/v63/[email protected]/es2021/typescript.js",
  ]
) {
  console.group(`\nprocessing file ${file}:`);

  console.group("fetching...");
  console.time("fetch");
  let fetched = await fetch(file).then((r) => r.text());
  console.timeEnd("fetch");
  printFileReport("fetched", fetched);
  console.groupEnd();

  console.group("transforming...");
  console.time("transform");
  let transformed = transform(fetched, {}).code;
  console.timeEnd("transform");
  printFileReport("transformed", transformed);
  console.groupEnd();

  console.group("parsing...");
  console.time("parse");
  let program = parse(fetched, { syntax: "ecmascript" });
  console.timeEnd("parse");
  printFileReport("parsed", JSON.stringify(program));
  console.groupEnd();

  console.group("printing...");
  console.time("print");
  let printed = print(program, {}).code;
  console.timeEnd("print");
  printFileReport("printed", printed);
  console.groupEnd();

  console.groupEnd();
}

function printFileReport(name: string, file: string) {
  console.log(`${name} size: ${file.length / 1e3 | 0}KB`);
}

Note that the print time for typescript.js is over 20 minutes.