Overview

Major functional changes:

• Allow import() to work within loaders that require other loaders,
• Unflag the use of Module.register.

A new interface Customizations has been created in order to unify ModuleLoader (previously DefaultModuleLoader), Hooks and CustomizedModuleLoader all of which now implement it:

interface LoadResult {
  format: ModuleFormat;
  source: ModuleSource;
}

interface ResolveResult {
  format: string;
  url: URL['href'];
}

interface Customizations {
  allowImportMetaResolve: boolean;
  load(url: string, context: object): Promise<LoadResult>
  resolve(
    originalSpecifier:
    string, parentURL: string,
    importAssertions: Record<string, string>
  ): Promise<ResolveResult>
  resolveSync(
    originalSpecifier:
    string, parentURL: string,
    importAssertions: Record<string, string>
  ) ResolveResult;
  register(specifier: string, parentUrl: string): any;
  forceLoadHooks(): void;
}

The ModuleLoader class now has setCustomizations which takes an object of this shape and delegates its responsibilities to this object if present.

Note that two properties allowImportMetaResolve and resolveSync exist now as a mechanism for import.meta.resolve – since Hooks does not implement resolveSync other loaders cannot use import.meta.resolve; allowImportMetaResolve is a way of checking for that case instead of invoking resolveSync and erroring.

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