@jsenv/import-map/src/internal/assertImportMap.js

Helpers to implement importmaps.

export const assertImportMap = (value) => {
  if (value === null) {
    throw new TypeError(`an importMap must be an object, got null`)
  }

  const type = typeof value
  if (type !== "object") {
    throw new TypeError(`an importMap must be an object, received ${value}`)
  }

  if (Array.isArray(value)) {
    throw new TypeError(`an importMap must be an object, received array ${value}`)
  }
}