55 lines
1.5 KiB
TypeScript
55 lines
1.5 KiB
TypeScript
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import Bun from 'bun'
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import { createMiddleware } from 'hono/factory'
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type BunTranspilerOptions = {
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extensions: string[]
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headers: HeadersInit
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transpilerOptions: Bun.TranspilerOptions
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}
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export const bunTranspiler = (
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options: BunTranspilerOptions = {
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extensions: ['.ts', '.tsx'],
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headers: { 'content-type': 'application/javascript' },
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transpilerOptions: {
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minifyWhitespace: true,
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target: 'browser',
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},
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}
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) => {
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return createMiddleware(async (c, next) => {
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await next()
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const url = new URL(c.req.url)
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const { extensions, headers, transpilerOptions } = options
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if (extensions.every((ext) => !url.pathname.endsWith(ext))) return
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try {
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const loader = url.pathname.split('.').pop() as Bun.TranspilerOptions['loader']
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const transpiler = new Bun.Transpiler({
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loader,
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...transpilerOptions,
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})
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const transpiledCode = await transpiler.transformSync(await c.res.text())
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c.res = c.newResponse(transpiledCode, { headers })
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} catch (error) {
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console.warn(`Error transpiling ${url.pathname}: ${error}`)
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const errorHeaders = {
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...headers,
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'content-type': 'text/plain',
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}
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if (error instanceof Error) {
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c.res = c.newResponse(error.message, {
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status: 500,
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headers: errorHeaders,
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})
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} else {
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c.res = c.newResponse('Malformed Input', {
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status: 500,
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headers: errorHeaders,
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})
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}
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}
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})
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}
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