58 lines
2.3 KiB
TypeScript
58 lines
2.3 KiB
TypeScript
import { CompilerOptions, transpile, TranspileOptions } from "jsr:@deno/emit";
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import denoJson from "./deno.json" with { type: "json" };
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const contentTypes = {
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'js': "application/javascript; charset=utf-8",
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// https://github.com/denoland/deno_ast/blob/ea1ccec37e1aa8e5e1e70f983a7ed1472d0e132a/src/media_type.rs#L117
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'ts': "text/typescript; charset=utf-8",
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'jsx': "text/jsx; charset=utf-8",
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'tsx': "text/tsx; charset=utf-8",
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} as const;
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const transpileOptions = (extension: keyof typeof contentTypes, tsCode: string, targetUrlStr: string): TranspileOptions => ({
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importMap: {
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imports: denoJson.imports,
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},
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compilerOptions: denoJson.compilerOptions as CompilerOptions,
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load(specifier) {
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const correctContent = specifier === targetUrlStr;
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return Promise.resolve({
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kind: "module",
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specifier,
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content: correctContent ? tsCode : "",
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headers: { "content-type": contentTypes[correctContent ? extension : 'js'] },
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});
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},
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});
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export default async function transpileResponse(response: Response, requestUrl: string, filepath?: string): Promise<Response> {
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const url = new URL(`ts-serve:///${ requestUrl }`);
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const pathname = filepath !== undefined ? filepath : url.pathname;
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const extension = pathname.split('.').at(-1) ?? '';
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if (response.status === 200 && (extension === 'ts' || extension === 'tsx' || extension === 'jsx')) {
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const tsCode = await response.text();
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const targetUrlStr = url.toString();
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try {
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const result = await transpile(url, transpileOptions(extension, tsCode, targetUrlStr));
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const jsCode = result.get(targetUrlStr);
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response.headers.delete("content-length");
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response.headers.set("content-type", contentTypes.js);
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return new Response(jsCode, {
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status: response.status,
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statusText: response.statusText,
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headers: response.headers,
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});
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} catch (e) {
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console.error('[transpileResponse]: Error transpiling!\n', e);
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if (typeof e === 'string') {
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return new Response('Internal Server Error', {
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status: 500,
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headers: response.headers,
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});
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}
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}
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}
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return response;
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}
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