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mod.ts
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mod.ts
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import { esbuild, importmap, resolve, toFileUrl } from "./deps.ts";
import { load } from "./src/loader.ts";
import { ModuleEntry } from "./src/deno.ts";
interface DenoPluginOptions {
/**
* Specify the path to an import map file to use when resolving import
* specifiers.
*/
importMapFile?: string;
}
export function denoPlugin(options: DenoPluginOptions = {}): esbuild.Plugin {
return {
name: "deno",
setup(build) {
const infoCache = new Map<string, ModuleEntry>();
let importMap: importmap.ParsedImportMap | null = null;
build.onStart(async function onStart() {
if (options.importMapFile !== undefined) {
const url = toFileUrl(resolve(options.importMapFile));
const txt = await Deno.readTextFile(url);
importMap = importmap.parseFromString(txt, url);
} else {
importMap = null;
}
});
build.onResolve({ filter: /.*/ }, function onResolve(
args: esbuild.OnResolveArgs,
): esbuild.OnResolveResult | null | undefined {
const resolveDir = args.resolveDir
? `${toFileUrl(args.resolveDir).href}/`
: "";
const referrer = args.importer || resolveDir;
let resolved: URL;
if (importMap !== null) {
const res = importmap.resolve(
args.path,
importMap,
new URL(referrer) || undefined,
);
resolved = res.resolvedImport;
} else {
resolved = new URL(args.path, referrer);
}
return { path: resolved.href, namespace: "deno" };
});
build.onLoad({ filter: /.*/ }, function onLoad(
args: esbuild.OnLoadArgs,
): Promise<esbuild.OnLoadResult | null> {
const url = new URL(args.path);
return load(infoCache, url, options);
});
},
};
}