long.js: TypeScript errors with moduleResolution nodenext

I am having trouble upgrading a package that recently switched a dependency from long@^4 to long@^5:

node_modules/long/umd/index.d.ts:1:18 - error TS1479: The current file is a CommonJS module whose imports will produce ‘require’ calls; however, the referenced file is an ECMAScript module and cannot be imported with ‘require’. Consider writing a dynamic ‘import(“…/index.js”)’ call instead.

1 import Long from “…/index.js”;

Found 1 error(s).

I can suppress the error by skipping library checks in my tsconfig.json file but perhaps this points to a problem with UMD?

Here is my complete tsconfig for reference (with skipLibCheck=false):

{
  "compilerOptions": {
    "module": "CommonJS",
    "resolveJsonModule": true,
    "declaration": false,
    "declarationMap": false,
    "removeComments": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es6",
    "lib": ["es6", "dom"],
    "sourceMap": true,
    "allowSyntheticDefaultImports": true,
    "outDir": "./dist",
    "baseUrl": "./",
    "moduleResolution": "nodenext",
    "esModuleInterop": true,
    "incremental": false,
    "skipLibCheck": false,
    "noEmit": false,
    "strictNullChecks": true,
    "noImplicitAny": true,
    "strictBindCallApply": true,
    "forceConsistentCasingInFileNames": true,
    "noFallthroughCasesInSwitch": true,
    "allowJs": true,
    "strict": false,
    "types": ["mocha", "chai", "node"]
  },
  "include": ["src/**/*", "hardhat.config.cjs"]
}

https://github.com/stephenh/ts-proto/issues/891