use dynamic import to load ESM-only packages

src/utils.ts

@@ -1,9 +1,10 @@
-import { unified } from "unified";
-import remarkParse from "remark-parse";
-import remarkStringify from "remark-stringify";
-import * as mdast from "mdast-util-to-string";
 import { getPackages, Package } from "@manypkg/get-packages";
 
+const { unified } = await import("unified");
+const remarkParse = (await import("remark-parse")).default;
+const remarkStringify = (await import("remark-stringify")).default;
+const mdast = await import("mdast-util-to-string");
+
 export const BumpLevels = {
   dep: 0,
   patch: 1,

tsconfig.json

@@ -3,7 +3,7 @@
     /* Basic Options */
     // "incremental": true,                   /* Enable incremental compilation */
     "target": "esnext" /* Specify ECMAScript target version: 'ES3' (default), 'ES5', 'ES2015', 'ES2016', 'ES2017', 'ES2018', 'ES2019' or 'ESNEXT'. */,
-    "module": "commonjs" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
+    "module": "esnext" /* Specify module code generation: 'none', 'commonjs', 'amd', 'system', 'umd', 'es2015', or 'ESNext'. */,
     // "lib": [],                             /* Specify library files to be included in the compilation. */
     // "allowJs": true,                       /* Allow javascript files to be compiled. */
     // "checkJs": true,                       /* Report errors in .js files. */
@@ -39,7 +39,7 @@
     // "noFallthroughCasesInSwitch": true,    /* Report errors for fallthrough cases in switch statement. */
 
     /* Module Resolution Options */
-    // "moduleResolution": "node",            /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */
+    "moduleResolution": "bundler" /* Specify module resolution strategy: 'node' (Node.js) or 'classic' (TypeScript pre-1.6). */,
     // "baseUrl": "./",                       /* Base directory to resolve non-absolute module names. */
     // "paths": {},                           /* A series of entries which re-map imports to lookup locations relative to the 'baseUrl'. */
     // "rootDirs": [],                        /* List of root folders whose combined content represents the structure of the project at runtime. */