ESMultiloader

Node.js ESM loader for chaining multiple custom loaders.

Warning This package has been deprecated

Multiple loaders are natively supported by Node.js v18.6+, you may still use this package for Node.js v16.12 to v18.5, but it will not be being maintained.

• Fast and lightweight
• No configuration required, but configurable if needed
• Usage compliant with Node's own loader middleware chaining proposal
• Supports all three resolve, load and globalPreload loader hooks

Install

npm i esmultiloader

Usage

node --loader loader2 --loader ./loader1.js --loader esmultiloader file.js

Optional Configuration

Options can be passed to esmultiloader to configure it's behavior using the following / separated list syntax:

node --loader esmultiloader/booleanoption/option=123/...

Where:

• booleanoption is a true/false option which is implicitly true when passed as an option.
• option is an option with a required value to be passed after the =, default values for these options vary per option.
• The first instance of a duplicated option takes precedence.
• A trailing slash does not matter.

Option	Type	Default	Description
iterative or ltr	Boolean	false	Chain loaders from left-to-right as described by the iterative chaining proposal instead of right-to-left. (Mutually exclusive with the option below)
middleware or rtl	Boolean	true	Chain loaders from right-to-left as described by the middleware chaining proposal instead of left-to-right. (Mutually exclusive with the option above)
debug	Boolean	false	Enable printing of esmultiloader debug logs.