index.ts

import { readFile } from 'fs/promises'

type Options = {
	prefix?: string
}
const PLUGIN_ID = 'rollup-plugin-inline-code'

export default (options: Options = {}) => {
	const { prefix = 'inline!' } = options

	return {
		name: 'rollup-plugin-inline-code',
		resolveId: async function (
			sourcePath: string,
			importer: string | undefined,
			options: {
				attribute: Record<string, string>
				custom: { [plugin: string]: any }
				isEntry: boolean
			},
		): Promise<{ id: string; moduleSideEffects: boolean } | null> {
			if (sourcePath.includes(prefix)) {
				const sourceArray = sourcePath.split(prefix)
				const name = sourceArray[sourceArray.length - 1] ?? {
					id: sourceArray[sourceArray.length - 1],
				}
				//@ts-ignore
				const resolvePath = await this.resolve(name, importer, options)
				return { id: `\0${PLUGIN_ID}:${resolvePath.id}`, moduleSideEffects: true }
			}
			return null
		},
		load: async function (id: string) {
			if (!id.startsWith(`\0${PLUGIN_ID}:`)) {
				return null
			}

			const filePath = id.slice(`\0${PLUGIN_ID}:`.length)
			const code = await readFile(filePath, 'utf-8')
			return `export default ${JSON.stringify(code)};`
		},
	}
}